CN110609314B - Afterglow testing device of scintillator - Google Patents
Afterglow testing device of scintillator Download PDFInfo
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- CN110609314B CN110609314B CN201911042918.1A CN201911042918A CN110609314B CN 110609314 B CN110609314 B CN 110609314B CN 201911042918 A CN201911042918 A CN 201911042918A CN 110609314 B CN110609314 B CN 110609314B
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- 238000012360 testing method Methods 0.000 title claims abstract description 61
- 229910052751 metal Inorganic materials 0.000 claims abstract description 62
- 239000002184 metal Substances 0.000 claims abstract description 62
- 230000007246 mechanism Effects 0.000 claims abstract description 15
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 5
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 5
- 229910052802 copper Inorganic materials 0.000 claims description 5
- 239000010949 copper Substances 0.000 claims description 5
- 229910052782 aluminium Inorganic materials 0.000 claims description 4
- 230000001105 regulatory effect Effects 0.000 abstract 1
- 238000000034 method Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 230000005855 radiation Effects 0.000 description 5
- 230000001133 acceleration Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- XQPRBTXUXXVTKB-UHFFFAOYSA-M caesium iodide Chemical compound [I-].[Cs+] XQPRBTXUXXVTKB-UHFFFAOYSA-M 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N23/00—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00
- G01N23/02—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material
- G01N23/04—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material and forming images of the material
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01T—MEASUREMENT OF NUCLEAR OR X-RADIATION
- G01T7/00—Details of radiation-measuring instruments
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- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Physics & Mathematics (AREA)
- General Health & Medical Sciences (AREA)
- Biochemistry (AREA)
- Analytical Chemistry (AREA)
- Chemical & Material Sciences (AREA)
- Immunology (AREA)
- Pathology (AREA)
- High Energy & Nuclear Physics (AREA)
- Molecular Biology (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Measurement Of Radiation (AREA)
Abstract
The invention provides an afterglow testing device of a scintillator, which comprises a platform (1), a turntable (2), a rocker length regulator (3), a rocker (4), a metal sliding block (5), a track (6), a ray generator and an afterglow detector, and is characterized in that the turntable (2) and the track (6) are arranged on the platform (1), the rocker length regulator (3) is used for finely regulating the length of the rocker (4), a platform through groove (9) is formed in the platform (1), a main testing sliding block through groove (7) is formed in the metal sliding block (5), the afterglow detector is used for receiving the afterglow of the scintillator to be tested, and the moving metal sliding block (5) always covers the upper part of the platform through groove when the afterglow test is carried out. According to the afterglow testing device of the scintillator, the metal sliding block is driven by the circulating constant-speed rotating connecting rod mechanism to control the on-off of rays received by the scintillator to be tested, so that the irradiation of the rays is more uniform and stable, and the afterglow testing times are improved.
Description
Technical Field
The invention relates to the technical field of ray detection, in particular to an afterglow testing device of a scintillator.
Background
In X-ray inspection systems, the afterglow problem of detectors based on cesium iodide crystals is relatively serious, especially with regard to the image penetration index. In order to improve the performance index of the X-ray inspection system, the afterglow of the detector needs to be tested for screening the detector or for subtracting the afterglow during image data calculation.
In the prior art, 1) an afterglow testing device generally adopts a belt to drive a metal sliding block to simulate the process that X rays are rapidly shielded. Every time the metal slide block is started in an accelerating way, passes through the gap at a set speed before the X-ray gap, and then stops and automatically returns to the starting position. A photoelectric sensor is arranged at a certain distance before and after the gap for transmitting X rays so as to sense the position of the metal sliding block for starting and stopping the X-ray source. Each test shows that the metal slide block has a starting and stopping process, and the movement of the metal slide block is not easy to control stably. The X-ray source also has a starting and stopping process, the working efficiency is low, and the dosage received by each afterglow detector has deviation, so that the afterglow test data is inaccurate; 2) The afterglow testing device of the scintillator of the Chinese patent document CN107861146A discloses a device for switching on and off a ray by adopting a rotator, and the afterglow testing device passes through the center of the rotator through radial arrangement of a through slot of the ray. The patent document also found that if the through groove is a straight groove, the radiation is not immediately turned off due to the rotation of the rotor, and there is a change in radiation intensity due to a change in thickness. Although this patent document also finds this problem and compensates for it by using a horn-shaped slot, there are drawbacks in that the rotor structure is complicated, the processing difficulty is high, and alignment control is difficult.
Disclosure of Invention
The invention aims to provide an afterglow testing device of a scintillator, which adopts a circulating constant-speed rotation link mechanism to drive a metal sliding block to control the on-off of rays received by the scintillator to be tested, so that the irradiation of the rays is more uniform and stable, and the afterglow testing times are improved.
The specific technical proposal of the invention is an afterglow testing device of a scintillator, which comprises a platform, a turntable, a rocker length regulator, a rocker, a metal sliding block, a track, a ray generator and an afterglow detector, and is characterized in that,
The turntable and the track are arranged on the platform, the rotating shaft of the turntable is perpendicular to the platform, one end of the rocker is hinged at the circumferential edge of the turntable, the other end of the rocker is hinged at the side surface of the metal slide block, the lower surface of the metal slide block is provided with a slide groove matched with the track, the metal slide block can slide along the track, the turntable, the rocker and the metal slide block form a pair of crank slide block mechanisms,
The rocker length adjuster is used for finely adjusting the length of the rocker,
The platform is provided with a platform through groove, the scintillator to be tested is placed under the platform through groove, the ray generator is arranged right above the platform through groove, rays emitted by the ray generator can pass through the platform through groove to irradiate the scintillator to be tested,
The metal slide block is provided with a main test slide block through groove, when the metal slide block moves to the middle position of the slide block of the crank slide block mechanism, the main test slide block through groove is positioned right above the platform through groove, so that rays emitted by the ray generator sequentially pass through the main test slide block through groove and the platform through groove to irradiate on the scintillator to be tested,
The afterglow detector is used for receiving the afterglow of the scintillator to be detected,
When afterglow test is carried out, the moving metal sliding block always covers the upper part of the platform through groove.
Furthermore, a plurality of parallel auxiliary test slide block through grooves are symmetrically and uniformly distributed on two sides of the main test slide block through groove on the metal slide block, and if the test is performed by using the main test slide block through groove only, the auxiliary test slide block through groove is closed by using a lead block.
Further, the rocker length adjuster is provided with an upper opening and a lower opening, internal threads with opposite rotation directions are respectively arranged in the upper opening and the lower opening, the rocker is divided into an upper section and a lower section, one end of the lower section is hinged at the circumferential edge of the turntable, the other end of the lower section is provided with external threads and is screwed into the lower opening of the rocker length adjuster, one end of the upper section is provided with external threads and is screwed into the upper opening of the rocker length adjuster, and the other end of the upper section is hinged on the side face of the metal sliding block.
Furthermore, the main test slide block through groove or the auxiliary test slide block through groove can be placed into copper blocks or aluminum blocks with different thicknesses and is used for adjusting the intensity of rays irradiated on the scintillator to be tested.
Still further still include the motor, the carousel at the uniform velocity rotation under the drive of motor.
The invention has the beneficial effects that 1) the afterglow testing device of the scintillator provided by the invention has the advantages that the circulation constant-speed rotation link mechanism drives the metal slide block to control the on-off of the rays received by the scintillator to be tested, the metal slide block is provided with the long slot for passing the rays, the passing radiation dose is more stable, and the on-off is quicker and more uniform; 2) The connecting rod mechanism of the driving slide block is a centering crank slide block mechanism, and the turntable serving as a crank is driven by the motor to rotate at a constant speed, so that the movement stability of the metal slide block can be ensured; 3) The main test slide block through groove on the metal slide block is positioned in the positive direction of the platform through groove at the middle position of the slide block movement, so that the radiation dose on the scintillator to be tested is maximum, and the speed of the slide block is maximum, the acceleration of the slide block is 0, and the radiation on-off is the most stable; 4) The rocker of the crank sliding block mechanism is provided with a length fine adjustment device, so that the position relation between the sliding block through groove and the platform through groove can be accurately adjusted, and the accuracy of afterglow test is improved; 5) The metal slide block is also provided with a plurality of auxiliary test slide block through grooves, and the number of afterglow measurement times is increased by matching with the rotating speed of the turntable; 6) Copper blocks or aluminum blocks with different thicknesses can be placed in the through grooves of the sliding blocks and used for adjusting the intensity of rays irradiated on the scintillator to be tested.
Drawings
FIG. 1 is a schematic structural view of an afterglow testing apparatus of a scintillator according to the present invention.
In the figure, a platform 1, a turntable 2, a rocker length adjuster 3, a rocker 4, a metal slide 5, a track 6, a main test slide through slot 7, a pair of test slide through slots 8 and a platform through slot 9.
Detailed Description
The specific technical scheme of the invention is further described below with reference to the attached drawings.
As shown in figure 1, the afterglow testing device of the scintillator comprises a platform 1, a turntable 2, a rocker length adjuster 3, a rocker 4, a metal sliding block 5, a track 6, a ray generator, an afterglow detector and a motor.
The turntable 2 and the track 6 are arranged on the platform 1, the rotating shaft of the turntable 2 is perpendicular to the platform 1, and the turntable 2 is driven by a motor to rotate at a constant speed. One end of the rocker 4 is hinged to the circumferential edge of the turntable 2, the other end of the rocker 4 is hinged to the side face of the metal sliding block 5, a sliding groove matched with the track is formed in the lower surface of the metal sliding block 5, the metal sliding block 5 can slide along the track 6, and the turntable 2, the rocker 4 and the metal sliding block 5 form a centering crank sliding block mechanism. When the turntable rotates at a constant speed, the centering crank slide block mechanism is adopted, so that the movement of the metal slide block 5 is more stable.
The rocker length adjuster 3 is used for fine adjustment of the length of the rocker 4. The rocker length adjuster 3 is provided with an upper opening and a lower opening, internal threads with opposite rotation directions are respectively arranged in the upper opening and the lower opening, the rocker 4 is divided into an upper section and a lower section, one end of the lower section is hinged at the circumferential edge of the turntable 2, the other end of the lower section is provided with external threads and screwed into the lower opening of the rocker length adjuster 3, one end of the upper section is provided with external threads and screwed into the upper opening of the rocker length adjuster 3, and the other end of the upper section is hinged on the side face of the metal sliding block 5.
The platform 1 on open and have platform logical groove 9, the measured scintillator is placed under platform logical groove 9, the ray generator install directly over platform logical groove 9, the ray that the ray generator sent can pass platform logical groove 9 and shine on the measured scintillator.
The metal slide block 5 is provided with a main test slide block through groove 7, and when the metal slide block 5 moves to the middle position of the slide block of the crank slide block mechanism, the main test slide block through groove 7 is positioned right above the platform through groove, so that rays emitted by the ray generator sequentially pass through the main test slide block through groove 7 and the platform through groove 9 to irradiate on the tested scintillator. At this time, the velocity of the metal slider 5 is the maximum, and the acceleration thereof is 0, so that the on-off of the rays can be most stable. In order to enable the metal slide block 5 to be positioned in the middle position in the movement of the crank slide block mechanism, the main test slide block through groove 7 is positioned right above the platform through groove 9, and the fine-adjustable rocker length adjuster 3 is realized.
And a plurality of parallel auxiliary test slide block through grooves 8 are symmetrically and uniformly distributed on two sides of the main test slide block through groove 7 on the metal slide block 5, and if the test is performed by using the main test slide block through groove 7 only, the auxiliary test slide block through groove 8 is closed by using a lead block. The main test slide block through groove 7 or the auxiliary test slide block through groove 8 can be placed with copper blocks or aluminum blocks with different thicknesses and is used for adjusting the intensity of rays irradiated on the scintillator to be tested.
The afterglow detector is used for receiving the afterglow of the scintillator to be detected.
The moving metal slide 5 always covers the upper part of the through groove of the platform when the afterglow test is carried out.
The movement of the mechanism of the specific embodiment of the testing device is analyzed, and the distance from the rotation axis of the turntable 2 to the fixed point of the rocker 4 is a. When the metal slide block 5 is at the uppermost position, the axle center of the turntable 2, the connection point between the turntable 2 and the rocker 4 and the connection point between the rocker 4 and the metal slide block 5 are on the same straight line. When the metal slide block 5 is at the uppermost limit position, the lower edge just shields the platform through groove 9. The width of the platform through groove 9 is delta, the size of delta ensures that the transmitted X-rays cover the detector width, and delta is far smaller than a. The width of the metal slider 5 is b, and b is greater than 2a. The metal slide block 5 is provided with n slide block through grooves parallel to the platform through grooves 9 in the width of 2a, and the gap distance f is formed between the slide blocks.
The plurality of slide through grooves formed on the metal slide 5 can be blocked by a metal plate, and the thickness of the metal plate can be selected. The ray generator is an X-ray source and is positioned vertically above the platform through groove 9, and the rays cover the whole length of the platform through groove 9. The turntable 2 rotates at a constant speed at an angular velocity ω. The X-ray source continuously emits rays, and N sliding block through grooves exactly coincide with the platform through grooves 9 in sequence and transmit X-rays in the process of rotating the turntable 2 from the point N to the point P to the point Q. When the turntable 2 continues to return to the N point from the Q point to the M point, the N slide block through grooves are sequentially overlapped with the platform through groove 9 and penetrate X rays. During one revolution of the turntable 2X-rays are transmitted 2n times. Copper or aluminum metal plates with different thicknesses are covered on different through grooves of the sliding block, so that the transmitted X-ray intensity is different, and the afterglow condition under different X-ray intensities can be obtained.
The turntable 2 rotates from the point N to the point P to just 90 DEG, and the metal slide block 5 moves by the distance: Then when h is 2a: s=1.268 a; when h is 3 a: s=1.172 a; when h is 4 a: s=1.127 a.
It can be seen that when the hinge point of the rocker 4 on the turntable 2 is rotated by 90 ° from the illustrated vertex, the distance moved by the metal slider 5 is greater than a, and becomes smaller as the length of the rocker 4 is longer, approaching a; and the moving speed of the metal slider 5 is approaching a·ω from being greater than a·ω. Therefore, the length of the rocker is adjusted by the rocker length adjuster 3 of the rocker 4, so that the speed of the reciprocating motion process of the metal sliding block 5 can be changed, and the position of the metal sliding block 5 can be accurately adjusted.
While the application has been disclosed in terms of preferred embodiments, the embodiments are not intended to limit the application. Any equivalent changes or modifications can be made without departing from the spirit and scope of the present application, and are intended to be within the scope of the present application. The scope of the application should therefore be determined by the following claims.
Claims (2)
1. An afterglow testing device of a scintillator comprises a platform (1), a turntable (2), a rocker length regulator (3), a rocker (4), a metal sliding block (5), a track (6), a motor, a ray generator and an afterglow detector, and is characterized in that,
The turntable (2) and the track (6) are arranged on the platform (1), the rotating shaft of the turntable (2) is perpendicular to the platform (1), the turntable (2) rotates at a constant speed under the drive of a motor, one end of the rocker (4) is hinged at the circumferential edge of the turntable (2), the other end of the rocker (4) is hinged at the side surface of the metal sliding block (5), the lower surface of the metal sliding block (5) is provided with a sliding groove matched with the track, the metal sliding block (5) can slide along the track (6), the turntable (2), the rocker (4) and the metal sliding block (5) form a centering crank sliding block mechanism,
The rocker length adjuster (3) is used for finely adjusting the length of the rocker (4),
The platform (1) is provided with a platform through groove (9), the scintillator to be tested is placed under the platform through groove (9), the ray generator is arranged right above the platform through groove (9), rays emitted by the ray generator can pass through the platform through groove (9) to irradiate the scintillator to be tested,
The metal slide block (5) is provided with a main test slide block through groove (7), when the metal slide block (5) moves to the middle position of the slide block of the centering crank slide block mechanism, the main test slide block through groove (7) is positioned right above the platform through groove, so that rays emitted by the ray generator sequentially pass through the main test slide block through groove (7) and the platform through groove (9) to irradiate on a tested scintillator,
A plurality of parallel auxiliary test slide block through grooves (8) are symmetrically and uniformly distributed on two sides of the main test slide block through groove (7) on the metal slide block (5), if the test is carried out by using the main test slide block through groove (7) only, the auxiliary test slide block through groove (8) is closed by using a lead block,
The main test slide block through groove (7) or the auxiliary test slide block through groove (8) can be placed with copper blocks or aluminum blocks with different thicknesses for adjusting the intensity of rays irradiated on the scintillator to be tested,
The afterglow detector is used for receiving the afterglow of the scintillator to be detected,
When afterglow test is carried out, the moving metal slide block (5) is always covered on the upper part of the platform through groove.
2. The afterglow testing device of a scintillator according to claim 1, characterized in that the rocker length adjuster (3) is provided with an upper opening and a lower opening, the upper opening and the lower opening are respectively provided with internal threads with opposite screwing directions, the rocker (4) is divided into an upper section and a lower section, one end of the lower section is hinged at the circumferential edge of the turntable (2), the other end of the lower section is provided with external threads and screwed into the lower opening of the rocker length adjuster (3), one end of the upper section is provided with external threads and screwed into the upper opening of the rocker length adjuster (3), and the other end of the upper section is hinged on the side face of the metal sliding block (5).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911042918.1A CN110609314B (en) | 2019-10-30 | 2019-10-30 | Afterglow testing device of scintillator |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911042918.1A CN110609314B (en) | 2019-10-30 | 2019-10-30 | Afterglow testing device of scintillator |
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| Publication Number | Publication Date |
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| CN110609314A CN110609314A (en) | 2019-12-24 |
| CN110609314B true CN110609314B (en) | 2024-07-02 |
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