CN111638539A - A kind of22New application of Na radioactive source and application method thereof - Google Patents

A kind of22New application of Na radioactive source and application method thereof Download PDF

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CN111638539A
CN111638539A CN202010513770.1A CN202010513770A CN111638539A CN 111638539 A CN111638539 A CN 111638539A CN 202010513770 A CN202010513770 A CN 202010513770A CN 111638539 A CN111638539 A CN 111638539A
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radioactive source
processing device
detection
point
receiving detector
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CN111638539B (en
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国思茗
陈庆文
蔡海毅
石磊
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Quanzhou Vocational And Technical University
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Quanzhou Vocational And Technical University
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01T—MEASUREMENT OF NUCLEAR OR X-RADIATION
    • G01T1/00—Measuring X-radiation, gamma radiation, corpuscular radiation, or cosmic radiation
    • G01T1/16—Measuring radiation intensity
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01T—MEASUREMENT OF NUCLEAR OR X-RADIATION
    • G01T1/00—Measuring X-radiation, gamma radiation, corpuscular radiation, or cosmic radiation
    • G01T1/29—Measurement performed on radiation beams, e.g. position or section of the beam; Measurement of spatial distribution of radiation
    • G01T1/2914—Measurement of spatial distribution of radiation
    • G01T1/2921—Static instruments for imaging the distribution of radioactivity in one or two dimensions; Radio-isotope cameras
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01T—MEASUREMENT OF NUCLEAR OR X-RADIATION
    • G01T7/00—Details of radiation-measuring instruments

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Abstract

The invention relates to22New application of Na radioactive source and application method thereof, in particular to a Na radioactive source22The Na radioactive source is used for positioning detection in the control of the manufacturing process in advance; application method by22The Na radioactive source emits gamma rays; the gamma rays are irradiated from the radioactive source to the receiving detector, and the radiation intensity of the gamma rays is influenced along with the difference of space paths through media and thickness; the gamma ray is received and detected by a receiving detector; the receiving detector converts the intensity of the received gamma-ray radiation into an electric signal to be output; the detection and use modes comprise vertical transillumination type point-to-point detection, symmetrical field intensity transillumination type point-to-face trend detection and the like;22the Na radioactive source belongs to an environment-friendly radioactive source which is basically harmless to human bodies and has no pollution to the environment, is newly applied to advanced manufacturing process control, is safer in detection and application and has more functionsThe displacement sensor can play a space, has good application and detection effects in various extreme or common operating environments, and can basically replace various displacement sensors used at present.

Description

A kind of22New application of Na radioactive source and application method thereof
Technical Field
The invention relates to22New application of Na radioactive sourceAnd methods of use thereof.
Background
Advanced Manufacturing Technology (AMT) was started in 1948, and includes various technologies such as mechanical Technology, electrical Technology, computer Technology, etc., which are generic terms of a series of technologies, apparatuses, and systems; the method is the integration of the traditional manufacturing technology and advanced technologies such as sensor technology, automation technology, internet technology and the like. The advanced manufacturing technology comprises various key technologies such as an intelligent manufacturing technology, a numerical control processing technology, a rapid forming technology and the like, and is common as follows: a numerical control machining center, a 3D printer, Laser solid forming (Laser solid forming) and the like.
The process control technology in the advanced manufacturing field is a control technology for carrying out closed-loop feedback control on the environment, the processing equipment and the processing condition in the processing process. With the development of materials, more and more processing materials are used in the advanced manufacturing field, and some special operation conditions such as a closed space, a non-light environment, special gas and the like are often met. These special circumstances may limit the application of conventional sensors.
The development trend of the advanced manufacturing technology is dispute 32429, but as the manufacturing technology, the development is inevitably towards the increasingly larger, faster and more precise targets, and the increasingly larger refers to the one-time processing volume; faster and faster refers to the processing speed; the increasingly fine refers to the machining precision. At present, the advanced manufacturing technology is in a bottleneck stage, and three development targets are mutually restricted and cannot be obtained simultaneously. The method is mainly limited by a positioning technology in the process control, the positioning technology in the process control has relative height after decades of development, the best precision is a closed-loop feedback positioning technology, the core of the closed-loop feedback positioning technology is various sensors, and the development of the positioning technology is limited by the existing sensor technology. In recent years, a variety of new measurement techniques have emerged, such as the use of Closed Magnetic circuits (Closed Magnetic circuits), kinematic and geometric error modeling (kinematic and geometric error modeling), or laser doppler vibrometers (laser doppler vibrometers). The radioactivity detection technique is a method using radioactive sourceAnd advanced technology for detecting various material properties and functionality by related detection equipment. Industrial radioactive sources, e.g.137Cs and60co is increasingly used, such as marking amino acid for various tumor imaging,60a Co source was used to synthesize PE fibers. The radioactive detection technology is utilized to carry out positioning, so that high precision and high sensitivity far beyond the traditional positioning mode can be realized, meanwhile, the radioactive detection technology has extremely strong penetrability, the requirement on arrangement and installation is lower than that of a traditional positioning sensor, and especially under some extreme special conditions, the condition is necessary for correcting position difference.
Radioactive isotope used in industrial instrument industry in China137Cs and60the Co radioactive source is the main one.137Cs is a radioactive isotope of Cs element, can be generated by 235U fission, is a product of nuclear test research, and is often used as an industrial nondestructive detection source. In the natural environment137Cs enter the human body mainly through the food chain, and after being absorbed by the human body, they can cause acute and chronic injuries to the internal tissues and viscera, especially the muscle tissues. As the study progresses, it later appears60Gradual start of Co Source replacement137The source of the Cs radiation,60the Co radioactive source has wider application, relates to various industries, can be used for breeding, insect prevention, food preservation and the like in agriculture, is mainly used for nondestructive inspection, radiation disinfection, radiation processing, detection and the like in industry,60co radioactive sources are usually produced in heavy water reactors, and are also very radioactive, which can cause hair loss and blood system diseases such as aplastic anemia, leukemia, etc. In conclusion, various radioactive rays harmful to human bodies and the environment exist in the use process of the existing radioactive detection technology, the requirement for advanced manufacturing equipment is relatively improved, relevant laws in China also clearly stipulate that enterprises need to use equipment containing dangerous radioactive sources and need to handle environment-friendly approval and radiation safety licenses, and therefore the existing radioactive source detection technology has limitation in industrial application.
Disclosure of Invention
The invention aims to provide22Advanced production process of Na radioactive sourceDetection application in control, this is22The new application of the Na radioactive source is detection application in the control of the manufacturing process, and the application can solve the problem of limitation of the existing radioactive source in the prior art in industrial application.
It is another object of the present invention to provide the above22New application method of Na radioactive source is provided.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a kind of22New application of Na radioactive source, in particular to22The Na radioactive source is used for detection in the control of the manufacturing process in advance.
The detection is applied as22The Na radioactive source is used for positioning detection in the control of the manufacturing process in advance.
A kind of22The application method of the new application of the Na radioactive source comprises the following steps in the positioning detection application,
1) through which22The Na radioactive source emits gamma rays;
2) the gamma rays are irradiated from the radioactive source to the receiving detector, and the radiation intensity of the gamma rays is influenced along with the difference of space paths through media and thickness;
3) the gamma ray is received and detected by a receiving detector;
4) and the receiving detector converts the intensity of the received gamma-ray radiation into an electric signal to be output.
The detection application method further comprises after step 4),
5) the electric signal output in the step 4) is sent to a positioning system, and the positioning system uses a statistically sensitive nonlinear iterative peak-stripping algorithm (SNIP) algorithm to eliminate background influence after receiving the electric signal of the detection equipment;
6) the positioning system determines the position information represented by the electric signal according to a preset method;
7) and carrying out positioning verification and correction on the current position data of the processing device through the position information.
The above-mentioned22Detection use mode bag for emitting gamma rays to receiving detector by Na radioactive sourceThe method comprises vertical transillumination type point-to-point detection, oblique angle direct illumination type point-to-point detection, asymmetric intensity field transillumination type point-to-surface detection or symmetric field intensity transillumination type point-to-surface trend detection.
The vertical transillumination point-to-point detection use mode comprises one or more point illumination modes22The Na radioactive source and a receiving detector are arranged in the advanced manufacturing equipment, a bearing platform for bearing and erecting the workpiece and a processing device capable of moving relative to the workpiece to process the workpiece are arranged in the advanced manufacturing equipment, and the point irradiation type22The Na radioactive source is arranged on the outer side of the bearing platform of the corresponding workpiece, which is back to the workpiece, the irradiation direction of the Na radioactive source is irradiated on one side of the corresponding workpiece to be processed, and the receiving detector is arranged on the processing device and can move along with the processing device; in the detection operation, the point illumination type22The directional gamma ray emitted by the Na radioactive source irradiates through the bearing platform and the workpiece, the receiving detector moves along with the processing device, and when the receiving detector moves to the point illumination mode22The Na radioactive source is opposite to the corresponding receiving detector to receive the gamma ray, the receiving detector outputs to the positioning system, and the positioning system is in a point illumination mode of corresponding passing22Performing positioning verification and correction on a preset position of the Na radioactive source;
or; the vertical transillumination type point-to-point detection use mode comprises a point illumination type22The Na radioactive source and one or more receiving detectors are arranged in the advanced manufacturing equipment, a bearing platform for bearing and erecting the workpiece and a processing device capable of moving relative to the workpiece to process the workpiece are arranged in the advanced manufacturing equipment, the receiving detectors are arranged on the outer sides, back to the workpiece, of the bearing platforms corresponding to the workpiece, and the point illumination type receiving detectors are arranged on the outer sides of the bearing platforms corresponding to the workpiece22The Na radioactive source is arranged on the processing device and can move along with the processing device, and the irradiation direction of the Na radioactive source corresponds to one side of the processed workpiece for irradiation; in the detection operation, the point illumination type22The directional gamma rays emitted by the Na radioactive source penetrate through the workpiece and the bearing platform to irradiate out, and simultaneously move along with the processing device, when the directional gamma rays move to a position opposite to the receiving detector, the receiving detector receives the gamma rays, the receiving detector outputs the gamma rays to the positioning system, and the positioning system performs positioning verification and correction corresponding to the passing preset position of the receiving detector.
The oblique angle direct-lighting point-to-point detection use mode comprises one or more point-lighting modes22The Na radioactive source and a receiving detector are arranged in the advanced manufacturing equipment, a bearing platform for bearing and erecting the workpiece and a processing device capable of moving relative to the workpiece to process the workpiece are arranged on the advanced manufacturing equipment, the receiving detector is arranged on the processing device and can move along with the processing device, and the point illumination type detector is arranged on the processing device22The Na radioactive source is arranged on the side wall which is lower than the periphery of the bearing platform of the processing device, and the irradiation direction of the Na radioactive source is an inclined angle and irradiates towards the opposite direction of the bearing platform; in the detection operation, the point illumination type22The directional gamma ray emitted by the Na radioactive source irradiates along the inclination angle, the receiving detector moves along with the processing device, and when the receiving detector moves to the point illumination type22The directional gamma ray path of the Na radioactive source receives the gamma ray from the receiving detector and outputs it to the positioning system, which is in point illumination mode22Performing positioning verification and correction on a preset position of the Na radioactive source;
or; the oblique angle direct-lighting point-to-point detection use mode comprises a point lighting type22The Na radioactive source and one or more receiving detectors are arranged in the advanced manufacturing equipment, a bearing platform for bearing and erecting the workpiece and a processing device capable of moving relative to the workpiece to process the workpiece are arranged in the advanced manufacturing equipment, and the point illumination type machine is characterized in that22The Na radioactive source is arranged on the processing device and can move along with the processing device, the irradiation direction of the Na radioactive source is an inclined angle and irradiates towards the direction of the peripheral side wall of the bearing platform, and the receiving detector is arranged on the side wall lower than the periphery of the bearing platform of the processing device; in the detection operation, the point illumination type22The directional gamma rays emitted by the Na radioactive source irradiate out along the inclination angle of the directional gamma rays, and simultaneously move along with the processing device, when the directional gamma rays move to the path corresponding to the receiving detector, the receiving detector receives the gamma rays, the receiving detector outputs to the positioning system, and the positioning system carries out positioning verification and correction according to the corresponding passing preset position of the receiving detector.
In the point illumination type22The Na radioactive source is arranged in a detection use mode positioning system on the processing device, and a DPD algorithm is adopted to realize the point illumination22And (5) performing positioning calculation by using a Na radioactive source.
The asymmetric intensity field transillumination type point-to-face detection use mode comprises a plurality of scattered illumination types22The Na radioactive source and a plurality of receiving detectors are arranged in the manufacturing equipment, a bearing platform for bearing and erecting a workpiece, a non-uniform thickness baffle plate arranged at a distance from the opposite surface of the bearing platform and a processing device capable of moving relative to the workpiece to process the workpiece are arranged in the manufacturing equipment, the processing device is arranged between the bearing platform and the non-uniform thickness baffle plate, and the radiation type receiving detectors are arranged in the radiation equipment22The Na radioactive source is arranged on one side of the uneven thickness baffle plate, which is back to the bearing platform, and the irradiation direction of the Na radioactive source irradiates towards one side of the bearing platform, and the receiving detector is arranged on the processing device and one side of the bearing platform, which is back to the uneven thickness baffle plate; in the detection and use work, the scattered radiation type22Gamma rays emitted by the Na radioactive source penetrate through a plane corresponding to a receiving detector on the processing device through the non-uniform thickness baffle to form an asymmetric intensity field, the receiving detector on the processing device detects the intensity of the received gamma rays and outputs the intensity to a positioning system, the receiving detector on one side of the bearing platform, which is back to the non-uniform thickness baffle, receives the gamma rays, draws a plane intensity map and stores the plane intensity map into the positioning system, and the positioning system determines the intensity corresponding position of the gamma rays output by the receiving detector on the processing device according to the plane intensity map and corrects the intensity in real time;
or; the asymmetric intensity field transillumination type point-to-face detection use mode comprises a plurality of scattered illumination types22The Na radioactive source and a plurality of receiving detectors are arranged in the manufacturing equipment, a bearing platform for bearing and erecting a workpiece, a non-uniform thickness baffle plate arranged at a distance from the opposite surface of the bearing platform and a processing device capable of moving relative to the workpiece to process the workpiece are arranged in the manufacturing equipment, the processing device is arranged between the bearing platform and the non-uniform thickness baffle plate, and the radiation type receiving detectors are arranged in the radiation equipment22The Na radioactive source is arranged on one side of the non-uniform thickness baffle, which is back to the bearing platform, and the irradiation direction of the Na radioactive source irradiates towards one side of the bearing platform, and the receiving detector is arranged on the processing device; in the detection and use work, the scattered radiation type22Gamma rays emitted by the Na radioactive source penetrate through the baffle with non-uniform thickness to form an asymmetric intensity field on a plane corresponding to the receiving detector, the receiving detector detects the intensity of the received gamma rays and outputs the intensity to a positioning system, a plane intensity map is preset in the positioning system, and the positioning system determines the intensity of the gamma rays output by the receiving detector according to the plane intensity mapThe intensity of (2) is corrected in real time corresponding to the position.
The point-to-face trend detection using mode of symmetrical field intensity transillumination comprises one or more scattered illumination modes22The Na radioactive source and a receiving detector are arranged in the system manufacturing equipment, a bearing platform for bearing and erecting a workpiece, a baffle plate with a seam arranged at a distance from the opposite surface of the bearing platform and a processing device capable of moving relative to the workpiece to process the workpiece are arranged in the system manufacturing equipment, the processing device is arranged between the bearing platform and the baffle plate with the seam, and the radiation type Na radioactive source and the receiving detector are arranged in the radiation type Na radioactive source22The Na radioactive source is arranged on one side of the baffle plate with the seam, which is back to the bearing platform, and the irradiation direction of the Na radioactive source irradiates towards one side of the bearing platform, and the receiving detector is arranged on the processing device; in the detection and use work, the scattered radiation type22The gamma rays emitted by the Na radioactive source penetrate through a plane corresponding to a receiving detector on the processing device through the slotted baffle to form a symmetrical intensity field, the receiving detector detects the intensity of the received gamma rays and outputs the intensity to a positioning system, a plane intensity axis map is preset in the positioning system, and the positioning system determines a single-axis position corresponding to the peak intensity of the gamma ray intensity output by the receiving detector according to the plane intensity axis map to perform single-axis correction.
By adopting the technical scheme, the invention has the beneficial effects that:22na radioactive source is the beginning of the rise in recent years and gradually replaced137Cs and60a Co radioactive source.22Na has a half-life of 2.6019a and is a positron emitter, which emits a gamma ray with an energy of 1.275MeV immediately after the emission of a positron. The exempted activity concentration is only 1E +01Bq/g in a small amount of use, the exempted activity concentration belongs to an environment-friendly radioactive source which is basically harmless to a human body and pollution-free to the environment, and instruments and instrument products based on a 22Na radioactive source can be used without being monitored by national departments.
In addition, in the process control in the advanced manufacturing field, many special operating environments, such as a closed space, a non-light environment, special gas and the like, can limit the application of the traditional sensor, and the invention22Na radioactivity detection technology can be applied to these scenes as a substitute technology, can make up the defect of the prior sensor technology in positioning the space of a processing device, and leads the technical field of advanced manufacturingThe process control reaches a new height. There are also other possibilities for radioactivity detection techniques, which require control of other physical factors such as temperature, humidity, etc. in addition to spatial positioning of the processing apparatus,22na radioactivity detection technology may have more room to come into play, further extending the processing window for advanced manufacturing.
Thereby it can know22The Na radioactive source has the advantages of using as the radioactive source, so that the application of the Na radioactive source in the detection application of the industrial advanced manufacturing process control can achieve the advantages of solving the problems in the background technology, namely22The new application of the Na radioactive source has good application effect in various extreme or common operation environments. In application, the device can adapt to most application scenes and obtain quite good measurement effect, and can basically replace various displacement sensors used at present.
Drawings
FIG. 1a is a schematic structural diagram of a usage mode of vertical transillumination point-to-point detection according to the present invention;
FIGS. 1b and 1c are a curved surface diagram and a line drawing of a vertical transillumination point-to-point detection according to the present invention;
FIG. 2a is a schematic structural diagram of a usage of oblique angle direct illumination type point-to-point detection according to the present invention;
FIGS. 2b and 2c are a curved view and a line drawing of the oblique angle direct type point-to-point detection according to the present invention;
FIG. 3a is a schematic diagram of the structure of the use mode of the asymmetric intensity field transillumination type point-to-face detection according to the present invention;
3b, 3c are a curved surface diagram and a line drawing of the asymmetric intensity field transillumination type point-to-face detection related to the invention;
FIG. 4a is a schematic diagram of a structure of a using mode of symmetrical field intensity transillumination type point-to-face trend detection related to the present invention;
fig. 4b and 4c are a curved surface diagram and a line drawing of the symmetrical field intensity transillumination type point-to-face trend detection related to the invention.
Detailed Description
In order to further explain the technical solution of the present invention, the present invention is explained in detail by the following specific examples.
Because the 22Na radioactive source belongs to an environment-friendly radioactive source which is basically harmless to human bodies and has no pollution to the environment, the radioactive source can be used without being monitored by national departments and is based on22Some products of Na-emitting sources, and thus a method of the invention22The new application of Na radioactive source is disclosed22The embodiment of the present invention is particularly suitable for positioning detection application in advanced manufacturing process control under a closed condition, and can solve some problems existing in the control process of the existing manner and the problems mentioned in the background art.
A kind of22The application method of the new application of the Na radioactive source comprises the following steps in the positioning detection application,
1) through which22The Na radioactive source emits gamma rays;
2) the gamma rays are irradiated from the radioactive source to the receiving detector, and the radiation intensity of the gamma rays is influenced along with the difference of space paths through media and thickness;
3) the gamma ray is received and detected by a receiving detector;
4) and the receiving detector converts the intensity of the received gamma-ray radiation into an electric signal to be output.
5) The electric signal output in the step 4) is sent to a positioning system, and the positioning system receives the electric signal of the detection equipment and then eliminates background influence by using a statistic sensitive nonlinear iterative peak stripping algorithm;
6) the positioning system determines the position information represented by the electric signal according to a preset method;
7) and carrying out positioning verification and correction on the current position data of the processing device through the position information.
The lowest detectable dose (MDD) of the receiving detector in step 4) above may be affected by the signal-to-noise ratio, affecting the detection, and in order to eliminate this background effect, the above step 5) is used in this embodiment.
Due to the fact that22The gamma ray emitted by the Na radioactive source has weak transmission power, and can transmit a 100mm homogeneous iron plate by taking an iron medium as an example, so that different installation and use modes are required to be adopted for detection and use according to actual conditions in the actual application process to achieve the required better use effect22Na radiation Source in advanced manufacturing Process control22The detection using modes of irradiating gamma rays emitted by the Na radioactive source to the receiving detector can be mainly divided into four using modes of vertical transillumination type point-to-point detection, oblique angle direct illumination type point-to-point detection, asymmetric intensity field transillumination type point-to-surface detection, symmetric field intensity transillumination type point-to-surface trend detection and the like. The following describes the four modes of use in detail with reference to the drawings.
First, the vertical transillumination point-to-point detection is disclosed in the following two modes of use.
The first mode of use, as shown in FIG. 1a, comprises one or more dot-illuminated modes22Na radioactive source 11 and a receiving detector 12, the number of which is arranged according to the control requirement, a bearing platform 13 for bearing and erecting the workpiece and a processing device 14 capable of moving relative to the workpiece to process the workpiece are arranged in the advanced manufacturing equipment, and the point irradiation type22The Na radioactive sources 11 are arranged on the bearing platform 13 of the corresponding workpiece, back to the outer side of the workpiece, the irradiation direction of the Na radioactive sources irradiates towards one side of the corresponding workpiece to be processed, a plurality of Na radioactive sources are arranged according to the detection requirement, and the receiving detectors 12 are arranged on the processing device 14 and can move along with the processing device; in the detection operation, the point illumination type22The directional gamma ray emitted from the Na radiation source 11 is irradiated through the support 13 and the workpiece, and the reception detector 12 moves with the machining device 14, and when the directional gamma ray is moved to a point irradiation type22The Na radioactive source 11 receives the gamma ray by the receiving detector 12 when facing to the corresponding, the receiving detector 12 outputs to the positioning system, and the positioning system passes through the point illumination type according to the corresponding22And (4) carrying out positioning verification and correction on the preset position of the Na radioactive source 11.
The second usage is different from the first usage in thatPoint lighting type22The positions of the Na radiation source and the receiving detector are reversed (not shown) and adjusted accordingly, including a point illumination22The Na radioactive source and one or more receiving detectors are arranged according to the control requirement, a bearing platform for bearing and erecting the workpiece and a processing device capable of moving relative to the workpiece to process the workpiece are arranged in the advanced manufacturing equipment, the receiving detectors are arranged at the outer side of the bearing platform of the corresponding workpiece, which faces away from the workpiece, a plurality of receiving detectors are arranged according to the detection requirement, and the point illumination type receiving detectors are arranged according to the detection requirement22The Na radioactive source is arranged on the processing device and can move along with the processing device, and the irradiation direction of the Na radioactive source corresponds to one side of the processed workpiece for irradiation; in the detection operation, the point illumination type22The directional gamma rays emitted by the Na radioactive source penetrate through the workpiece and the bearing platform to irradiate out, and simultaneously move along with the processing device, when the directional gamma rays move to a position opposite to the receiving detector, the receiving detector receives the gamma rays, the receiving detector outputs the gamma rays to the positioning system, and the positioning system performs positioning verification and correction corresponding to the passing preset position of the receiving detector.
Secondly, the oblique angle direct illumination type point-to-point detection discloses two using modes.
The first mode of use, as shown in FIG. 2a, comprises one or more dot-illuminated modes22Na radioactive source 11 and a receiving detector 12, the number of which is arranged according to the control requirement, a bearing platform 13 for bearing and erecting the workpiece and a processing device 14 capable of moving relative to the workpiece to process the workpiece are arranged in the advanced manufacturing equipment, the receiving detector 12 is arranged on the processing device 14 and can move along with the processing device, and the point illumination type device is used for detecting the position of the receiving detector 1222The Na radioactive sources 11 are arranged on the side wall which is lower than the periphery of the bearing platform of the processing device 14, the irradiation direction of the Na radioactive sources is the opposite direction of the bearing platform 13 with an inclined angle, and a plurality of Na radioactive sources are arranged according to the detection requirement; in the detection operation, the point illumination type22The directional gamma ray emitted from the Na radioactive source 11 is irradiated along the inclination angle thereof, and the receiving detector 12 moves along with the processing device 14, and when the receiving detector moves to the point illumination type22The directional gamma ray path of the Na radioactive source 11 receives the gamma ray from the receiving detector 12 and outputs it to the positioning system which corresponds to the gamma ray pathPassing point lighting type22And (4) carrying out positioning verification and correction on the preset position of the Na radioactive source 11.
The second usage is different from the first usage in that the lighting device is point-lighting22The positions of the Na radiation source and the receiving detector are reversed (not shown) and adjusted accordingly, including a point illumination22The Na radioactive source and one or more receiving detectors are arranged in number according to the control requirement, a bearing platform for bearing and erecting the workpiece and a processing device capable of moving relative to the workpiece to process the workpiece are arranged in the advanced manufacturing equipment, and the point illumination type22The Na radioactive source is arranged on the processing device and can move along with the processing device, the irradiation direction of the Na radioactive source irradiates towards the direction of the peripheral side wall of the bearing platform at an inclined angle, the receiving detector is arranged on the peripheral side wall of the bearing platform lower than the processing device, and a plurality of receiving detectors are arranged according to the detection requirement; in the detection operation, the point illumination type22The directional gamma rays emitted by the Na radioactive source irradiate out along the inclination angle of the directional gamma rays, and simultaneously move along with the processing device, when the directional gamma rays move to the path corresponding to the receiving detector, the receiving detector receives the gamma rays, the receiving detector outputs to the positioning system, and the positioning system carries out positioning verification and correction according to the corresponding passing preset position of the receiving detector.
In the using mode, the point illumination type is needed to be obtained in the positioning system of the detecting using mode22The Na radiation source position is obtained by the DPD algorithm (digital pre-distortion algorithm) to point illumination type22And (5) performing positioning calculation by using a Na radioactive source.
Third, the asymmetric intensity field transillumination point-to-face detection, two modes of use are disclosed below.
The first usage mode comprises a plurality of scattered radiation modes22The Na radioactive source and the receiving detectors are arranged according to the control requirement, a bearing platform for bearing and erecting the workpiece, a non-uniform thickness baffle plate arranged at a distance from the opposite surface of the bearing platform and a processing device capable of moving relative to the workpiece to process the workpiece are arranged in the advanced manufacturing equipment, the processing device is arranged between the bearing platform and the non-uniform thickness baffle plate, and the scattered radiation type detector is22The Na radioactive source 11 is arranged on one side of the uneven thickness baffle back to the bearing platform according to detection requirements, the irradiation direction of the Na radioactive source irradiates towards one side of the bearing platform, and the receiving detectors are arranged on the processing device and one side of the bearing platform back to the uneven thickness baffle; in the detection and use work, the scattered radiation type22The gamma rays emitted by the Na radioactive source 11 penetrate through a plane corresponding to a receiving detector on the processing device through the non-uniform thickness baffle to form an asymmetric intensity field, the receiving detector on the processing device detects the intensity of the received gamma rays and outputs the intensity to a positioning system, the receiving detector on one side of the bearing platform, back to the non-uniform thickness baffle, receives the gamma rays, draws a plane intensity map, stores the plane intensity map into the positioning system, and the positioning system determines the intensity corresponding position of the gamma rays output by the receiving detector on the processing device according to the plane intensity map to perform real-time correction.
The second usage is different from the first usage in that the point receiving detector is provided, as shown in FIG. 3a, with a plurality of scattered radiation type detectors22The Na radioactive source 11 and a plurality of receiving detectors 12 are arranged according to the control requirement, a bearing platform 13 for bearing and erecting the workpiece, a non-uniform thickness baffle plate 15 arranged at a distance from the opposite surface of the bearing platform and a processing device 14 capable of moving relative to the workpiece to process the workpiece are arranged in the advanced manufacturing equipment, the processing device 14 is arranged between the bearing platform 13 and the non-uniform thickness baffle plate 15, and the scattered radiation type receiving detectors 12 are arranged in a manner of being distributed according to the control requirement22The Na radioactive source 11 is arranged on one side of the uneven thickness baffle 15 back to the bearing platform 13 according to the detection requirement, the irradiation direction of the Na radioactive source irradiates towards one side of the bearing platform 13, and the receiving detector 12 is arranged on the processing device 14; in the detection and use work, the scattered radiation type22Gamma rays emitted by the Na radioactive source 11 penetrate through the non-uniform thickness baffle 15 to form an asymmetric intensity field on a plane corresponding to the receiving detector 12, the receiving detector 12 detects the intensity of the received gamma rays and outputs the intensity to a positioning system, a plane intensity map is preset in the positioning system, and the positioning system determines the position corresponding to the intensity of the gamma rays output by the receiving detector 12 according to the plane intensity map and carries out real-time correction. This way the arrangement of the receiving detector 12 on the side of the platform 13 facing away from the non-uniform thickness baffle 15 is reduced, and therefore this wayThe planar intensity map is preset in the positioning system before use, and the planar intensity map can be drawn before or during use.
Fourth, the symmetrical field intensity transillumination type point-to-surface trend detection, as shown in fig. 4a, includes one or more scattered illumination type22The Na radioactive source 11 and a receiving detector 12 are arranged according to the control requirement, a bearing platform 13 for bearing and erecting the workpiece, a slotted baffle plate 16 arranged at a distance from the opposite surface of the bearing platform 13 (the action of the slotted baffle plate 16 is known in the test content described below and is not described here) and a processing device 14 capable of moving relative to the workpiece to process the workpiece are arranged in the advanced manufacturing equipment, the processing device 14 is arranged between the bearing platform 13 and the slotted baffle plate 16, and the scattered radiation type detector is arranged22The Na radioactive source 11 is arranged on one side of the slit baffle 16 back to the bearing platform 13 according to the detection requirement, the irradiation direction of the Na radioactive source irradiates towards one side of the bearing platform 13, and the receiving detector 12 is arranged on the processing device 14; in the detection and use work, the scattered radiation type22Gamma rays emitted by the Na radioactive source 11 penetrate through the slotted baffle 16 to form a symmetrical intensity field on a plane corresponding to the receiving detector 11 on the processing device 14, the receiving detector 12 detects the intensity of the received gamma rays and outputs the intensity to a positioning system, a plane intensity axis map is preset in the positioning system, and the positioning system determines a single-axis position corresponding to the peak intensity of the gamma ray intensity output by the receiving detector 12 according to the plane intensity axis map and carries out single-axis correction.
The following are the experimental procedures and results of the above four detection methods, and the experiment uses Ikefis22The self-made gamma-ray emitting device and the self-made gamma-ray receiving and detecting device of the Na radioactive source respectively test four using conditions in closed simulation processing equipment, and the test results are as follows.
Firstly, vertical transillumination point-to-point detection.
In the test space is placed a22The Na radioactive source and the receiving detector perform one-time traversal movement on the top side. Through22The receiving detector receives a strong signal when the Na radioactive source is right above the receiving detector, and only receives weak background noise at other times, as shown in figure 1b and figure1c in the curved view and the line graph. According to the detection result, the identification significance of the preset irradiation point is good, and the preset detection positioning work can be completed. The efficiency of only placing one test point in the space is lower, the detection interval time is longer, detection needs to be carried out at a plurality of positions in practical application so as to improve the detection efficiency, and the sparse array can be used for improving the positioning precision, so that the positioning process control of the processing device can be ensured in the actual manufacturing and processing process by improving the detection efficiency.
And secondly, oblique angle direct-illumination point-to-point detection.
One is arranged at the left side in the test space22The Na radioactive source and the receiving detector perform one-time traversal movement on the top side. The receiver receives a strong signal when passing a predetermined location and only weak background noise at other times, as shown by the curved and line graphs of fig. 2b and 2 c. According to the detection result, the identification significance of the preset irradiation point is good, and the preset detection positioning work can be completed by carrying out multi-point measurement. The 22Na radioactive source is more complicated than a vertical type radioactive source in expectation, and then the detection is carried out by adopting a method of firstly mounting and then positioning through reverse thinking, so that the mounting process is greatly simplified, the later positioning process is slightly complicated, but the whole mounting difficulty is reduced.
And thirdly, carrying out transillumination point-to-surface detection on the asymmetric intensity field.
One at each of three specific positions in the test space22The Na radioactive source and the receiving detector perform one-time traversal movement on the top side. The receiver receives the strongest signal when passing through three specific locations and receives the differential strength signal at other times, as shown by the curved and line graphs of fig. 3b and 3 c. According to the detection result, the performance of the curve diagram with the preset radiation intensity meets the requirement, the accuracy rate is slightly influenced by equipment, the requirements on the sealing performance and the radiation-proof performance of the equipment are high, the influence of external background radiation needs to be reduced as much as possible, and the iron material can be replaced by lead, concrete, olive peat and the like. Although the real-time performance of detection is excellent, the method is limited by overhigh equipment requirement and cost, and may not be suitable for being used in a large-range space. The difference from the other three is mainly due to the instability and environment of the radioactive sourceThe method is mainly realized by the fact that different signal intensities exist in different points, and has three difficulties, namely, the data of a signal intensity database corresponding to a point set is huge, the data processing speed can only be improved by means of an advanced algorithm, but the data scale does not change greatly; secondly, the influence of background noise is more serious than that of the other three types, because the intensity is continuously changed for the points, and the noise intensity is inevitably greater than the change intensity for two very close points, thereby causing certain influence on measurement; and thirdly, the processing process is controlled by processing equipment, and the real-time monitoring significance is not large, so that the asymmetrical intensity field transillumination type point-to-face detection can not be adopted under the condition of no particularly high detection frequency requirement.
Fourthly, symmetrical field intensity transillumination type point-to-surface trend detection.
Four are placed at the bottom side in the test space22The Na radioactive source and the receiving detector perform one-time traversal movement on the top side. The signal received by the receiving detector is strongest when passing over the reserved gap of the slotted baffle, the intensity is lower as the closer position is farther away from the gap, and only weak background noise is received at the farther position, as shown in the curved surface diagram and the broken line diagram of fig. 4b and 4 c. According to the detection result, the preset radiation intensity peak value line is well identified, the preset detection positioning work can be completed, the intensity drops well before and after the received signal intensity peak value, the false detection rate is extremely low, and the detection frequency is greatly improved compared with a vertical type on the whole. The method has three problems that firstly, the processing range takes a spatial central point as a processing central point, and the deviation from the spatial central point can reduce the detection frequency; secondly, a strong signal area in a small range is generated near the central point of the space, and the detection error rate in the area is high; and thirdly, extremum detection can not be carried out in parallel with the reserved gap. For these problems, there is a simple improvement scheme, for example, a strong signal area in a small range generated near the central point of space can be detected by installing a single point vertical transillumination point-to-point detection without reserving a gap at the central position, so that on one hand, the strong signal area is not generated any more, and on the other hand, the accuracy of positioning the central position is improved. For example, the processing range is as followsThe spatial center point is a processing center point, the deviation from the spatial center point can reduce the detection frequency, and if the arrangement mode of the gap is changed, for example, a certain algorithm is used, the gap layout is planned, the detection frequency averaging of the spatial plane is realized, and the like.
The four detection modes disclosed above have different use environments and performance characteristics, and the practical application selects a suitable use according to factors such as a machining workpiece, a machining environment, machining conditions, a material, detection requirements and the like in manufacturing. As shown in table 1 below, the vertical transillumination point-to-point detection has high precision, high sensitivity, high detection speed and high accuracy, has interval detection, may have high equipment cost, and may not be suitable for a processed medium which cannot be penetrated; the oblique angle direct-lighting point-to-point detection is slightly lower in cost, can not directly irradiate the processed medium, and has higher requirements on installation precision and calculation measuring points; the point-to-surface detection cost of the asymmetrical intensity field transillumination type is low, real-time detection can be realized, the detection precision and the accuracy are low, the intensity map drawing is complex, and strong algorithm support is possibly needed; compared with point-to-surface trend detection, the symmetrical field intensity transillumination type point-to-surface trend detection has the advantages of lower detection precision, short detection interval, simple intensity graph drawing and lower algorithm requirement.
Figure BDA0002529247250000151
Figure BDA0002529247250000161
Through the above experiments of the four detection methods, each of the four detection methods has advantages and disadvantages and a use environment, it can be found that the radioactivity detection technology has advantages compared with the prior sensor technology without considering the cost and the application environment: the detection precision is not limited by the space size; the detection precision is irrelevant to the processing equipment; the detection precision is not influenced by the processed body; the detection frequency is low due to high detection precision, and an active detection process can be added through a program; the material of a part of the processed body can be influenced by radioactive rays for use (such as protein, modified plastic and the like);22na radiationThe high source safety is matched with a computer with higher degree in the process control, thereby being beneficial to improving the use effect of the method.
The above embodiments and drawings are not intended to limit the form and style of the present invention, and any suitable changes or modifications thereof by those skilled in the art should be considered as not departing from the scope of the present invention.

Claims (10)

1. A kind of22The new application of the Na radioactive source is characterized in that:22the Na radioactive source is used for detection in the control of the manufacturing process in advance.
2. A process as claimed in claim 122The new application of the Na radioactive source is characterized in that: the detection is applied as22The Na radioactive source is used for positioning detection in the control of the manufacturing process in advance.
3. A process as claimed in claim 222The new application method of the Na radioactive source is characterized in that: in a location detection application comprising the following steps,
1) through which22The Na radioactive source emits gamma rays;
2) the gamma rays are irradiated from the radioactive source to the receiving detector, and the radiation intensity of the gamma rays is influenced along with the difference of space paths through media and thickness;
3) the gamma ray is received and detected by a receiving detector;
4) and the receiving detector converts the intensity of the received gamma-ray radiation into an electric signal to be output.
4. A process as claimed in claim 322The new application method of the Na radioactive source is characterized in that: the detection application method further comprises after step 4),
5) the electric signal output in the step 4) is sent to a positioning system, and the positioning system receives the electric signal of the detection equipment and then eliminates background influence by using a statistic sensitive nonlinear iterative peak stripping algorithm;
6) the positioning system determines the position information represented by the electric signal according to a preset method;
7) and carrying out positioning verification and correction on the current position data of the processing device through the position information.
5. A process as claimed in claim 3 or 422The new application method of the Na radioactive source is characterized in that: the above-mentioned22The detection and use modes of the gamma rays emitted by the Na radioactive source and irradiated to the receiving detector comprise vertical transillumination type point-to-point detection, oblique angle direct illumination type point-to-point detection, asymmetric intensity field transillumination type point-to-surface detection or symmetric field intensity transillumination type point-to-surface trend detection.
6. One kind as set forth in claim 522The new application method of the Na radioactive source is characterized in that: the vertical transillumination point-to-point detection use mode comprises one or more point illumination modes22The Na radioactive source and a receiving detector are arranged in the advanced manufacturing equipment, a bearing platform for bearing and erecting the workpiece and a processing device capable of moving relative to the workpiece to process the workpiece are arranged in the advanced manufacturing equipment, and the point irradiation type22The Na radioactive source is arranged on the outer side of the bearing platform of the corresponding workpiece, which is back to the workpiece, the irradiation direction of the Na radioactive source is irradiated on one side of the corresponding workpiece to be processed, and the receiving detector is arranged on the processing device and can move along with the processing device; in the detection operation, the point illumination type22The directional gamma ray emitted by the Na radioactive source irradiates through the bearing platform and the workpiece, the receiving detector moves along with the processing device, and when the receiving detector moves to the point illumination mode22The Na radioactive source is opposite to the corresponding receiving detector to receive the gamma ray, the receiving detector outputs to the positioning system, and the positioning system is in a point illumination mode of corresponding passing22Performing positioning verification and correction on a preset position of the Na radioactive source;
or;
the vertical transillumination type point-to-point detection use mode comprises a point illumination type22The Na radioactive source and one or more receiving detectors are arranged in the manufacturing equipment, a bearing platform for bearing and erecting the workpiece and a processing device capable of moving relative to the workpiece to process the workpiece are arranged in the manufacturing equipment, the receiving detectors are arranged on the outer side of the bearing platform corresponding to the workpiece, which faces away from the workpiece,the point illumination type22The Na radioactive source is arranged on the processing device and can move along with the processing device, and the irradiation direction of the Na radioactive source corresponds to one side of the processed workpiece for irradiation; in the detection operation, the point illumination type22The directional gamma rays emitted by the Na radioactive source penetrate through the workpiece and the bearing platform to irradiate out, and simultaneously move along with the processing device, when the directional gamma rays move to a position opposite to the receiving detector, the receiving detector receives the gamma rays, the receiving detector outputs the gamma rays to the positioning system, and the positioning system performs positioning verification and correction corresponding to the passing preset position of the receiving detector.
7. One kind as set forth in claim 522The new application method of the Na radioactive source is characterized in that: the oblique angle direct-lighting point-to-point detection use mode comprises one or more point-lighting modes22The Na radioactive source and a receiving detector are arranged in the advanced manufacturing equipment, a bearing platform for bearing and erecting the workpiece and a processing device capable of moving relative to the workpiece to process the workpiece are arranged on the advanced manufacturing equipment, the receiving detector is arranged on the processing device and can move along with the processing device, and the point illumination type detector is arranged on the processing device22The Na radioactive source is arranged on the side wall which is lower than the periphery of the bearing platform of the processing device, and the irradiation direction of the Na radioactive source is an inclined angle and irradiates towards the opposite direction of the bearing platform; in the detection operation, the point illumination type22The directional gamma ray emitted by the Na radioactive source irradiates along the inclination angle, the receiving detector moves along with the processing device, and when the receiving detector moves to the point illumination type22The directional gamma ray path of the Na radioactive source receives the gamma ray from the receiving detector and outputs it to the positioning system, which is in point illumination mode22Performing positioning verification and correction on a preset position of the Na radioactive source;
or;
the oblique angle direct-lighting point-to-point detection use mode comprises a point lighting type22The Na radioactive source and one or more receiving detectors are arranged in the advanced manufacturing equipment, a bearing platform for bearing and erecting the workpiece and a processing device capable of moving relative to the workpiece to process the workpiece are arranged in the advanced manufacturing equipment, and the point illumination type machine is characterized in that22The Na radioactive source is arranged on the processing device, can move along with the processing device and irradiates towards the direction of the peripheral side wall of the bearing platform by taking the irradiation direction as an inclined angleThe receiving detector is arranged on a side wall lower than the periphery of the bearing platform of the processing device; in the detection operation, the point illumination type22The directional gamma rays emitted by the Na radioactive source irradiate out along the inclination angle of the directional gamma rays, and simultaneously move along with the processing device, when the directional gamma rays move to the path corresponding to the receiving detector, the receiving detector receives the gamma rays, the receiving detector outputs to the positioning system, and the positioning system carries out positioning verification and correction according to the corresponding passing preset position of the receiving detector.
8. One kind as set forth in claim 722The new application method of the Na radioactive source is characterized in that: in the point illumination type22The Na radioactive source is arranged in a detection use mode positioning system on the processing device, and a DPD algorithm is adopted to realize the point illumination22And (5) performing positioning calculation by using a Na radioactive source.
9. One kind as set forth in claim 522The new application method of the Na radioactive source is characterized in that: the asymmetric intensity field transillumination type point-to-face detection use mode comprises a plurality of scattered illumination types22The Na radioactive source and a plurality of receiving detectors are arranged in the manufacturing equipment, a bearing platform for bearing and erecting a workpiece, a non-uniform thickness baffle plate arranged at a distance from the opposite surface of the bearing platform and a processing device capable of moving relative to the workpiece to process the workpiece are arranged in the manufacturing equipment, the processing device is arranged between the bearing platform and the non-uniform thickness baffle plate, and the radiation type receiving detectors are arranged in the radiation equipment22The Na radioactive source is arranged on one side of the uneven thickness baffle plate, which is back to the bearing platform, and the irradiation direction of the Na radioactive source irradiates towards one side of the bearing platform, and the receiving detector is arranged on the processing device and one side of the bearing platform, which is back to the uneven thickness baffle plate; in the detection and use work, the scattered radiation type22Gamma rays emitted by the Na radioactive source penetrate through a plane corresponding to a receiving detector on the processing device through the non-uniform thickness baffle to form an asymmetric intensity field, the receiving detector on the processing device detects the intensity of the received gamma rays and outputs the intensity to a positioning system, the receiving detector on one side of the bearing platform, back to the non-uniform thickness baffle, receives the gamma rays, draws a plane intensity map, stores the plane intensity map into the positioning system, and the positioning system stores the plane intensity map into the positioning system according to the plane intensity mapDetermining the intensity corresponding position of the gamma ray intensity output by a receiving detector on the processing device for real-time correction;
or;
the asymmetric intensity field transillumination type point-to-face detection use mode comprises a plurality of scattered illumination types22The Na radioactive source and a plurality of receiving detectors are arranged in the manufacturing equipment, a bearing platform for bearing and erecting a workpiece, a non-uniform thickness baffle plate arranged at a distance from the opposite surface of the bearing platform and a processing device capable of moving relative to the workpiece to process the workpiece are arranged in the manufacturing equipment, the processing device is arranged between the bearing platform and the non-uniform thickness baffle plate, and the radiation type receiving detectors are arranged in the radiation equipment22The Na radioactive source is arranged on one side of the non-uniform thickness baffle, which is back to the bearing platform, and the irradiation direction of the Na radioactive source irradiates towards one side of the bearing platform, and the receiving detector is arranged on the processing device; in the detection and use work, the scattered radiation type22Gamma rays emitted by the Na radioactive source penetrate through the baffle with the non-uniform thickness to form an asymmetric intensity field on a plane corresponding to the receiving detector, the receiving detector detects the intensity of the received gamma rays and outputs the intensity to the positioning system, a plane intensity map is preset in the positioning system, and the positioning system determines the intensity corresponding position of the gamma rays output by the receiving detector according to the plane intensity map and carries out real-time correction.
10. One kind as set forth in claim 522The new application method of the Na radioactive source is characterized in that: the point-to-face trend detection using mode of symmetrical field intensity transillumination comprises one or more scattered illumination modes22The Na radioactive source and a receiving detector are arranged in the system manufacturing equipment, a bearing platform for bearing and erecting a workpiece, a baffle plate with a seam arranged at a distance from the opposite surface of the bearing platform and a processing device capable of moving relative to the workpiece to process the workpiece are arranged in the system manufacturing equipment, the processing device is arranged between the bearing platform and the baffle plate with the seam, and the radiation type Na radioactive source and the receiving detector are arranged in the radiation type Na radioactive source22The Na radioactive source is arranged on one side of the baffle plate with the seam, which is back to the bearing platform, and the irradiation direction of the Na radioactive source irradiates towards one side of the bearing platform, and the receiving detector is arranged on the processing device; in the detection and use work, the scattered radiation type22The gamma ray emitted by the Na radioactive source penetrates through a plane corresponding to a receiving detector of the slit baffle plate on the processing device to form a pairAnd weighing an intensity field, detecting the intensity of the received gamma rays by a receiving detector, and outputting the intensity to a positioning system, wherein a plane intensity axis map is preset in the positioning system, and the positioning system determines a single-axis position corresponding to the peak intensity of the gamma rays output by the receiving detector according to the plane intensity axis map to perform single-axis correction.
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CN105699403A (en) * 2016-01-28 2016-06-22 长治清华机械厂 Arrangement method for detecting vertical transillumination by orientation X rays
CN106352952A (en) * 2016-08-09 2017-01-25 中石化宁波工程有限公司 Solid material level detecting device and method
CN109405926A (en) * 2018-12-06 2019-03-01 北京金德创业测控技术有限公司 Radioactive instrument measures material position, the method for density using Radioactive instrument

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1965759A (en) * 2005-11-17 2007-05-23 株式会社日立制作所 Radiological imaging apparatus and transmission imaging method
CN105699403A (en) * 2016-01-28 2016-06-22 长治清华机械厂 Arrangement method for detecting vertical transillumination by orientation X rays
CN106352952A (en) * 2016-08-09 2017-01-25 中石化宁波工程有限公司 Solid material level detecting device and method
CN109405926A (en) * 2018-12-06 2019-03-01 北京金德创业测控技术有限公司 Radioactive instrument measures material position, the method for density using Radioactive instrument

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