CN108758189B - Scanning platform for imaging radiometer - Google Patents
Scanning platform for imaging radiometer Download PDFInfo
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- CN108758189B CN108758189B CN201711483582.3A CN201711483582A CN108758189B CN 108758189 B CN108758189 B CN 108758189B CN 201711483582 A CN201711483582 A CN 201711483582A CN 108758189 B CN108758189 B CN 108758189B
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- 238000003384 imaging method Methods 0.000 title claims abstract description 26
- 230000007246 mechanism Effects 0.000 claims abstract description 56
- 238000006073 displacement reaction Methods 0.000 claims abstract description 36
- 239000003921 oil Substances 0.000 claims description 57
- 239000010720 hydraulic oil Substances 0.000 claims description 32
- 238000007789 sealing Methods 0.000 claims description 27
- 238000005096 rolling process Methods 0.000 claims description 18
- 238000013016 damping Methods 0.000 claims description 3
- 238000010408 sweeping Methods 0.000 abstract description 2
- 238000009826 distribution Methods 0.000 description 12
- 238000000034 method Methods 0.000 description 11
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- 238000004891 communication Methods 0.000 description 3
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- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000003139 buffering effect Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 238000012935 Averaging Methods 0.000 description 1
- 206010044565 Tremor Diseases 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
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- 239000002184 metal Substances 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16M—FRAMES, CASINGS OR BEDS OF ENGINES, MACHINES OR APPARATUS, NOT SPECIFIC TO ENGINES, MACHINES OR APPARATUS PROVIDED FOR ELSEWHERE; STANDS; SUPPORTS
- F16M11/00—Stands or trestles as supports for apparatus or articles placed thereon ; Stands for scientific apparatus such as gravitational force meters
- F16M11/20—Undercarriages with or without wheels
- F16M11/22—Undercarriages with or without wheels with approximately constant height, e.g. with constant length of column or of legs
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16M—FRAMES, CASINGS OR BEDS OF ENGINES, MACHINES OR APPARATUS, NOT SPECIFIC TO ENGINES, MACHINES OR APPARATUS PROVIDED FOR ELSEWHERE; STANDS; SUPPORTS
- F16M11/00—Stands or trestles as supports for apparatus or articles placed thereon ; Stands for scientific apparatus such as gravitational force meters
- F16M11/02—Heads
- F16M11/04—Means for attachment of apparatus; Means allowing adjustment of the apparatus relatively to the stand
- F16M11/043—Allowing translations
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16M—FRAMES, CASINGS OR BEDS OF ENGINES, MACHINES OR APPARATUS, NOT SPECIFIC TO ENGINES, MACHINES OR APPARATUS PROVIDED FOR ELSEWHERE; STANDS; SUPPORTS
- F16M11/00—Stands or trestles as supports for apparatus or articles placed thereon ; Stands for scientific apparatus such as gravitational force meters
- F16M11/02—Heads
- F16M11/18—Heads with mechanism for moving the apparatus relatively to the stand
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J5/02—Constructional details
- G01J5/0205—Mechanical elements; Supports for optical elements
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J2005/0077—Imaging
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Transmission Devices (AREA)
- Geophysics And Detection Of Objects (AREA)
Abstract
The invention discloses a scanning platform for an imaging radiometer, which comprises a T-shaped bracket; the first linear displacement mechanism, the second linear displacement mechanism and the oil pump are communicated with the linear displacement mechanism and an oil tank; a controller connecting the linear displacement mechanism and the oil pump; the upper computer is communicated with the controller through a serial port, and a display device is arranged on the upper computer; the linear displacement mechanism includes: the device comprises a driving mechanism, a first guide rail, a first sliding block, a second guide rail, a second sliding block and a distance measuring module, wherein the first sliding block is arranged in the first guide rail in a sliding manner, the second guide rail is arranged at the upper end of the first guide rail, the second sliding block is arranged in the second guide rail in a sliding manner, the third sliding block is connected to the upper end of the second sliding block, the oil pump is communicated with the inner end space of the second guide rail through an electromagnetic valve, and a flowmeter is arranged on the electromagnetic valve. The invention solves the technical problem that the moving distance of the sliding table on the sweeping platform is inaccurate.
Description
Technical Field
The invention relates to the technical field of automatic control, in particular to a scanning platform for an imaging radiometer.
Background
The millimeter wave synthetic aperture imaging radiometer is called as a radiometer for short, an antenna array consisting of small-aperture antennas is used for carrying out high-sensitivity measurement on millimeter wave radiation signals of a target scene, a visibility function of the scene is measured through complex correlation operation among array elements, and a brightness and temperature distribution image of the target scene is inverted. Compared with the traditional real-aperture imaging technology, the synthetic aperture imaging technology has the characteristics of good real-time performance, high spatial resolution and the like, can realize high-resolution real-time imaging of hidden metal targets under severe weather conditions such as haze, night and the like, and is widely applied to the fields of military affairs, navigation, medical treatment, traffic safety inspection and the like. The basic structure of the synthetic aperture imaging system is a binary interferometer, and coherent imaging of a target scene can be realized by means of a two-dimensional antenna scanning platform.
The sliding table on the existing two-dimensional antenna scanning platform is generally directly driven by a motor, the motor has a minimum step angle and is rotated by inertia, so that the sliding table can have a minimum moving distance when advancing every time, the position of the sliding table is deviated from a target position, the scanning position of an antenna installed on the sliding table is deviated, and finally, an image is distorted. On the other hand, as the lead screw driving the sliding table to advance is longer and slightly bent, the lead screw generates periodic slight shaking during rotation, so that the sliding table is also shaken, the antenna shakes, and finally, the image shakes to influence the imaging quality.
Disclosure of Invention
An object of the present invention is to solve at least the above problems and to provide at least the advantages described later.
The invention aims to provide a two-dimensional antenna scanning platform for a radiometer, which enables an array element antenna of a synthetic aperture imaging radiometer to perform plane scanning according to a certain working mode. The antenna is indirectly installed on the ball screw guide rail sliding table through a hydraulic system, and the singlechip is used for controlling the rotation of the stepping motor through the stepping motor driver, so that the sliding table is driven to move horizontally or vertically, and plane scanning is realized. The invention solves the technical problem that the moving distance of the sliding table on the sweeping platform is inaccurate.
To achieve these objects and other advantages in accordance with the purpose of the invention, there is provided a scanning platform for an imaging radiometer, comprising:
a T-shaped bracket;
a first linear displacement mechanism provided on a lateral bracket of the T-shaped bracket;
the second linear displacement mechanism is arranged on the longitudinal support of the T-shaped support;
the oil pump is communicated with the linear displacement mechanism and an oil tank;
a controller connecting the linear displacement mechanism and the oil pump; and
the upper computer is communicated with the controller through a serial port, and a display device is arranged on the upper computer;
the linear displacement mechanism includes:
a drive mechanism connected to the controller;
the first guide rail is of a closed structure, a screw rod connected with a driving shaft of the driving mechanism is arranged in the first guide rail along the length direction, a brake controlled by the controller is arranged on the outer side wall of the tail end of the first guide rail, a retractable brake hoop is arranged on the brake, a brake pad is arranged on the inner side wall of the brake hoop, the brake is arranged on the first guide rail through a damping mechanism, and the tail end of the screw rod protrudes out of the outer side wall of the tail end of the first guide rail for a certain distance and extends into the brake hoop;
the first sliding block is arranged in the first guide rail in a sliding mode, and the first sliding block is sleeved on the screw rod;
the second guide rail is arranged at the upper end of the first guide rail, the inner space of the second guide rail is communicated with the inner space of the first guide rail at the end head, and the upper end of the second guide rail is covered by a cover plate with a slot;
the second sliding block is arranged in the second guide rail in a sliding mode, hydraulic oil is filled between the first sliding block and the end head of the first guide rail and between the second sliding block and the end head of the second guide rail, and a guide rod extends upwards from the groove at the upper end of the second sliding block;
the third sliding block is connected to the upper end of the guide rod, is arranged on the cover plate in a sliding mode, and is connected with a rolling plate for sealing the groove; and
the distance measuring module is arranged at the tail end of the second guide rail, a distance measuring port of the distance measuring module is aligned to the tail end of the third sliding block, and the output end of the distance measuring module is connected with the controller;
the oil pump is connected with an inlet of a buffer through an electromagnetic valve, hydraulic oil is filled in the buffer, the longitudinal sectional area of the buffer is not smaller than that of the second guide rail, an outlet of the buffer is communicated with the inner end space of the second guide rail, and a flow meter is arranged on the electromagnetic valve.
Preferably, the linear displacement mechanism is arranged on the T-shaped support through a mounting seat, the driving mechanism is a stepping motor, and the driving mechanism is in driving connection with the screw rod through a connecting seat.
Preferably, the longitudinal section of the first slider is consistent with the longitudinal section of the inner space of the first guide rail, first guide grooves are formed in two inner side walls of the first guide rail, first guide blocks are correspondingly arranged on the side walls of the first slider, the first guide blocks are arranged in the first guide grooves in a sliding mode, and first sealing rings are arranged on the periphery of the end head of the first slider.
Preferably, a threaded hole is formed in the center of the first sliding block in a penetrating mode along the length direction, the first sliding block is sleeved on the screw rod through the threaded hole, and a threaded sealing sleeve is arranged between the threaded hole and the screw rod.
Preferably, the upper end of the first guide rail is sealed by a first cover plate, and a plurality of through holes are formed in the end head of the first cover plate; the second guide rail is arranged at the upper end of the first cover plate, and the inner space of the second guide rail is communicated with the inner space of the first guide rail through the through hole.
Preferably, the longitudinal section of the second slider is consistent with the longitudinal section of the inner space of the second guide rail, second guide grooves are formed in two inner side walls of the second guide rail, second guide blocks are correspondingly arranged on the side walls of the second slider, the second guide blocks are arranged in the second guide grooves in a sliding mode, and second sealing rings are arranged on the periphery of the end head of the second slider.
Preferably, the upper end of the second guide rail is sealed by a second cover plate, a guide groove is formed in the second cover plate, the third slider is arranged on the guide groove in a sliding mode through the guide rod, the groove is formed in the second cover plate in a penetrating mode along the length direction, third guide grooves are formed in two inner side walls of the groove, third guide blocks are correspondingly arranged on two side walls of the guide rod, a sealing rubber mat is arranged in the third guide grooves, and the third guide blocks are arranged in the sealing rubber mat in a sliding mode.
Preferably, an accommodating box is arranged outside the second guide rail, an elastic rolling device is arranged in the accommodating box, the rolling plate is wound on the periphery of the elastic rolling device, an alignment opening is arranged on the accommodating box, the free end of the rolling plate is connected with the side wall of the end head of the guide rod through the alignment opening, the width of the rolling plate is larger than that of the groove, and two sides of the free end of the rolling plate are slidably arranged in the sealing rubber gasket.
Preferably, first slider both ends are provided with first touch switch, second slider both ends are provided with second touch switch, third slider both ends are provided with third touch switch, just second guide rail end protrusion is provided with an initial point switch, second guide rail tail end protrusion is provided with a terminal switch, each the switch with the controller is connected.
Preferably, the oil tank sets up on the T font support, the oil pump entry with the oil-out intercommunication of oil tank, the export of oil pump through first solenoid valve with the entry intercommunication of buffer, be provided with first flowmeter on the first solenoid valve, the inside end department of second guide rail is provided with the calibration oil return opening, the calibration oil return opening through a second solenoid valve with oil tank oil return opening intercommunication, be provided with the second flowmeter on the second solenoid valve, each solenoid valve and flowmeter respectively with the controller is connected.
Compared with the prior art, the invention has the following beneficial effects:
1. the invention utilizes serial port communication between the upper computer and the singlechip to realize the control and display of the scanning system on the upper computer, including the control and control of the scanning system, the modification of the operating parameters of the scanning system and the real-time display of the current sliding table position, thereby optimizing the control process of the scanning platform;
2. the method has the characteristics of high precision, simplicity and convenience in operation, good stability, high safety and the like, and provides a necessary platform foundation for high-precision imaging of the millimeter wave synthetic aperture radiometer;
3. the moving process of the sliding table is more accurate, the shaking of the sliding table is eliminated, and the imaging quality is improved.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.
Drawings
FIG. 1 is a schematic diagram of the general structure of the present invention;
FIG. 2 is a schematic structural view of a first linear displacement mechanism of the present invention;
FIG. 3 is a schematic structural view of a first slider;
FIG. 4 is a schematic view of the internal structure of the first rail;
FIG. 5 is a schematic view of the internal structure of the second guide rail;
FIG. 6 is a schematic view of a second rail top configuration;
FIG. 7 is a schematic view of an assembled structure of the third slider;
FIG. 8 is a side view of the first linear displacement mechanism;
fig. 9 is a schematic view of the installation structure of the rolled sheet.
Detailed Description
The present invention is described in further detail below with reference to the attached drawings so that those skilled in the art can implement the invention by referring to the description.
As shown in fig. 1-9, the present invention provides a scanning platform for an imaging radiometer including a support, a linear displacement mechanism, an oil pump, and a control system.
The distribution of two-dimensional arrays currently applied to imaging systems is mainly: "T" shaped distribution, "cross" shaped distribution, "U" shaped distribution, "Y" shaped distribution, circumferential distribution, and other similar distributions, etc. After simulation analysis is carried out on the base line (namely, visibility sampling point) distribution and point source imaging result (namely, point spread function PSF) of the two-dimensional antenna arrays, the array element distribution of the U-shaped antenna array and the T-shaped antenna array can be found to be similar, the corresponding base line distribution is uniform rectangular distribution, and the array structures of the U-shaped antenna array and the T-shaped antenna array are simpler, so that the U-shaped antenna array and the T-shaped antenna array are more commonly used comprehensive aperture antenna arrays at present; but their baseline redundancy is relatively high, and although the image recovery effect can be enhanced by averaging and summing the same baseline, their array element antenna utilization is not high, and therefore the spatial resolution of the system is relatively low. Compared with a T-shaped array, the U-shaped array increases the antenna array element spacing in the vertical direction, improves the azimuth resolution in the vertical direction, but also reduces the non-aliasing field of view in the vertical direction, so that the PSF has aliasing phenomenon. And the Y-shaped array and the circular array simultaneously consider the reduction of the redundancy of the antenna and the improvement of the spatial resolution of the system. Unlike the previously described "T" and "U" antenna arrays, the "Y" and circular shapes greatly reduce their baseline redundancy and increase their maximum baseline length. Unfortunately, however, the "Y" pattern lacks more long baselines, making it less pronounced for resolution improvement; and the circumferential array has uniform distribution of the long base lines, so that the spatial resolution is better improved. However, the improvement of the spatial resolution brings the loss of the baseline, and the point source response of the PSF is more or less accompanied by noise which can greatly influence the recovery of a continuous target; it may happen that some targets with strong point source responses generate accompanying noise exceeding the original point source responses of weak targets, so that targets with weak point source responses cannot be recovered, which is especially serious in a circular array due to strong accompanying noise.
In order to make the imaging effect better, the invention adopts the antenna array with a T-shaped structure with good PSF and simple structure, a T-shaped support is provided for the purpose, and the antenna array with the T-shaped structure can be realized by movably arranging the antenna on the T-shaped support.
Be provided with first straight line displacement mechanism 300 on the horizontal support of T font support, first straight line displacement mechanism 300 passes through mount pad 100 horizontal installation on the horizontal support, be provided with second straight line displacement mechanism 400 on the vertical support of T font support, second straight line displacement mechanism 400 passes through mount pad 200 and installs perpendicularly on vertical support, is provided with the third slider 700 that is used for bearing the weight of the antenna on the first straight line displacement mechanism 300, is provided with the third slider 800 that is used for bearing the weight of the antenna on the second straight line displacement mechanism 400.
The first linear displacement mechanism 300 has the same configuration as the second linear displacement mechanism 400, and the first linear displacement mechanism 300 will be described in the present embodiment.
The first linear displacement mechanism 300 includes:
the driving mechanism 310 is connected with the controller of the scanning platform, in this embodiment, the driving mechanism 310 adopts a stepping motor, so as to accurately adjust the scanning step distance each time;
the first guide rail 320 is of a closed structure, the upper end of the first guide rail 320 is sealed by a first cover plate 500, an accommodating space is arranged inside the first guide rail 320, and a screw rod 340 connected with a driving shaft of the driving mechanism 310 is arranged in the first guide rail 320 along the length direction; specifically, the driving mechanism 310 is in driving connection with the lead screw 340 through a connecting seat 311, and the lead screw 340 is located at the center of the inner space of the first guide rail 320;
the first sliding block 330 is slidably disposed in the first guide rail 320, the first sliding block 330 is sleeved on the lead screw 340, and when the driving mechanism 310 drives the lead screw 340 to rotate, the first sliding block 330 can be controlled to move back and forth in the first guide rail 320;
the second guide rail 540 is arranged at the upper end of the first guide rail 320, specifically, the second guide rail 540 is arranged at the upper end of the first cover plate 500 in an overlapping manner, the direction of the second guide rail 540 is consistent with that of the first guide rail 320, an accommodating space is also arranged inside the second guide rail 540, the inner space of the second guide rail 540 is communicated with the inner space of the first guide rail 320 at the end, specifically, a plurality of through holes 510 are longitudinally formed in the end of the first cover plate 500 in a penetrating manner, and the inner space of the second guide rail is communicated with the inner space of the first guide rail through the through holes 510; the upper end of the second guide rail 540 is covered by a second cover plate 600 with a slot 610;
the second slider 520 is slidably arranged in the second guide rail 540, hydraulic oil is filled between the first slider 330 and the end of the first guide rail 320 and between the second slider 520 and the end of the second guide rail 540, and the second guide rail inner space is communicated with the first guide rail inner space at the end through the through hole 510, so that when the first slider is driven to move back and forth in the first guide rail, the volume of the hydraulic oil between the second slider 520 and the end of the second guide rail 540 is changed, and the position of the second slider in the second guide rail is changed; a guide rod 620 extends upwards from the slot 610 at the upper end of the second slider 520;
the third slider 700 is connected to the upper end of the guide rod 620, the third slider 700 is slidably disposed on the second cover plate 600, so that the third slider 700 moves synchronously with the second slider 520, the antenna is disposed on the third slider 700, and the scanning of the antenna on the target object can be completed by gradually changing the position of the third slider; a rolling plate 531 for sealing the groove 610 is connected to the guide rod 620 and is used for sealing the groove 610 between the guide rod 620 and the end of the second guide rail, so that a sealed cavity is formed between the second slider 520 and the end of the second guide rail; and
the distance measuring module 350 is arranged at the tail end of the second guide rail 540, in the invention, the distance measuring module 350 adopts an infrared distance sensor, and a distance measuring port of the distance measuring module 350 is aligned with the tail end of the third slider 700, and is used for measuring the position and the moving distance of the third slider and transmitting the acquisition information of the distance measuring module 350 to the controller;
wherein, still be provided with an oil pump on the connecting seat 311, connect the entry of a buffer, be full of hydraulic oil in the buffer, the export of buffer with the inside end space intercommunication of second guide rail 540, be provided with a flowmeter on the solenoid valve, the oil pump is used for finely tuning the inside hydraulic oil capacity of second guide rail 540, and the position to the third slider is just finely tuned, therefore the oil pump acts as a micro-regulating switch's effect, carries out the fine setting of position through the volume of hydraulic oil, and the regulation stride is littleer, and the adjustment distance is more accurate controllable.
The buffer is used for buffering the oil pump process of delivering oil, the longitudinal section area of buffer is not less than the longitudinal section area of second guide rail to when reducing the oil pump and starting or stopping, the oil mass of sending into is to the impact in the twinkling of an eye that the inside oil mass of second guide rail produced, that is to say, cause the impact to the second slider, cause the second slider so that third slider and the scanning system who installs on the third slider tremble, influence the formation of image quality, at the start-stop of oil pump in the twinkling of an eye, the oil mass of oil pump pumping enters into inside the second guide rail after the buffer buffering, thereby slowly change the oil mass in the second guide rail, also be the position of slowly changing the second slider, in order to finely tune the position to the second slider, avoid opening and stopping the shake that causes the second slider in the twinkling of an eye at the oil pump.
In the above technical solution, a longitudinal cross section of the first slider 330 is consistent with a longitudinal cross section of an inner space of the first guide rail 320, so that the first slider 330 is just movably attached to the inner space of the first guide rail 320 to move, the two inner side walls of the first guide rail 320 are provided with first guide grooves 321, the side wall of the first slider 330 is correspondingly provided with first guide blocks 335, the first guide blocks 335 are slidably arranged in the first guide grooves 321 to provide guidance for the sliding of the first slider 330, and at the same time, the first slider 330 is ensured to strictly move linearly along the direction of the first guide rail, so as to reduce a longitudinal offset, and finally reduce the longitudinal shaking of the first slider, meanwhile, the periphery of the end head of the first slider 330 is provided with a first sealing ring 331, the first slider 330 is in sliding contact with the peripheral side wall of the inner space of the first guide rail 320 through the first sealing ring 331, the sealing performance of the contact position of the first sliding block 330 and the inner space of the first guide rail 320 is ensured, and the hydraulic oil between the first sliding block 330 and the end of the inner space of the first guide rail 320 is prevented from leaking between the first sliding block 330 and the tail end of the inner space of the first guide rail 320.
The center of the first slider 330 is provided with a threaded hole 334 along the length direction in a penetrating manner, the first slider 330 is sleeved on the screw rod 340 through the threaded hole 334, the driving mechanism controls the first slider to move back and forth in the first guide rail 320 by rotating the screw rod, the volume of hydraulic oil between the first slider 330 and the end head of the inner space of the first guide rail 320 is changed, so that the volume of hydraulic oil between the second slider and the end head of the inner space of the second guide rail is changed, the second slider is driven to move, the position of an antenna on the third slider is finally changed, and the antenna is driven to scan a target object. The antenna on the platform is indirectly arranged on the ball screw guide rail sliding table through the hydraulic system, the position of the antenna is adjusted through the hydraulic system, the scanning step distance is changed through changing the volume of hydraulic oil by the hydraulic system, the minimum step distance is smaller, the adjustment accuracy is higher, the deviation between the antenna and the target position is eliminated, and the shake of the driving mechanism during starting and stopping is absorbed, so that the moving process of the antenna is more accurate and controllable, the longitudinal shake of the sliding table is eliminated through the hydraulic system, and the scanning imaging quality of the antenna is finally improved.
And a thread sealing sleeve 333 is arranged between the threaded hole 334 and the screw rod 340, so that the sealing effect between the threaded hole 334 and the screw rod 340 is achieved, and the hydraulic oil is prevented from extending into the threaded hole.
Similarly, the longitudinal section of the second slider 520 is consistent with the longitudinal section of the inner space of the second guide rail 540, so that the second slider is just movably attached to the inner space of the second guide rail to move, the two inner side walls of the second guide rail 540 are provided with second guide grooves, the side wall of the second slider 520 is correspondingly provided with a second guide block, the second guide block is slidably arranged in the second guide grooves to provide guidance for the sliding of the second slider, and simultaneously, the second slider is ensured to strictly move linearly along the direction of the second guide rail, so as to reduce the longitudinal offset, finally reduce the longitudinal shaking of the second slider, meanwhile, the periphery of the end head of the second slider 520 is provided with a second sealing ring 522, the second slider 520 is in sliding contact with the peripheral side walls of the inner space of the second guide rail 540 through the second sealing ring 522, so as to ensure the sealing performance of the contact position between the second slider 520 and the inner space of the second guide rail 540, the leakage of the hydraulic oil between the second slider 520 and the end of the inner space of the second rail 540 to the space between the second slider 520 and the end of the inner space of the second rail 540 is prevented.
The second slider is driven by a hydraulic system, specifically, the driving mechanism drives the screw rod to rotate according to a set program, so as to change the volume of hydraulic oil between the first slider 330 and the end of the inner space of the first guide rail 320, so as to change the volume of hydraulic oil between the second slider and the end of the inner space of the second guide rail, drive the second slider to move, finally change the position of the antenna on the third slider, and drive the antenna to scan a target object.
In the above technical solution, a brake controlled by the controller is disposed on the outer side wall of the tail end of the first guide rail 320, the brake is provided with a retractable brake hoop which consists of two retractable semicircular hoops, the two semicircular hoops can be expanded outwards or contracted inwards, the inner side wall of the brake hoop is provided with a brake block, the tail end of the screw rod protrudes out of the outer side wall of the tail end of the first guide rail for a certain distance, and extends into the brake hoop, the driving mechanism 310 drives the screw 340 to rotate and drive the first sliding block 330 to move, and then the position of the antenna on the third slide block is changed, when the third slide block moves to the set target position, in order to reduce the influence of the inertia of the driving mechanism on the displacement of the third sliding block, the brake hoop is controlled to contract, and the offset between the third sliding block and the target position is reduced by locking the brake piece and the screw rod. When the driving mechanism is restarted to control the third sliding block to move, the brake hoop is controlled to expand outwards, the brake hoop is loosened from the screw rod, and the screw rod normally rotates to wait for the first sliding block to move.
The brake is arranged on the first guide rail through a damping mechanism, so that the influence of impact on the first guide rail and even on the third sliding block in the braking process is reduced, the shake is reduced, and the scanning quality of the scanning equipment is improved.
In the above technical solution, the upper end of the second guide rail 540 is sealed by the second cover plate 600, the second cover plate 600 is provided with a guide groove 630, the direction of the guide groove 630 is consistent with the length direction of the first guide rail and the second guide rail, the third slider 700 is slidably disposed on the guide groove 630 through the guide rod 620 to provide guidance for the sliding of the third slider, and meanwhile, the third slider is ensured to strictly move linearly along the length direction of the first guide rail, so as to reduce the longitudinal offset, and finally reduce the longitudinal shaking of the third slider, the slot 610 is disposed at the center of the second cover plate 600 along the length direction, third guide grooves are disposed on two inner side walls of the slot 610, third guide blocks are correspondingly disposed on two side walls of the guide rod 620, and a sealing rubber pad is disposed in the third guide grooves, the third guide blocks are slidably disposed in the sealing rubber pad, the tightness of the contact position of the guide rod 620 and the groove 610 is ensured, and the leakage of hydraulic oil between the second sliding block and the end head of the inner space of the second guide rail from the groove is avoided.
Meanwhile, an accommodating box 530 is arranged outside the second guide rail 540, an elastic rolling device is arranged in the accommodating box 530, the rolled plate 531 is wound around the periphery of the elastic rolling device 533, the rolled plate 531 keeps a contraction state under the elastic acting force of the elastic rolling device 533, an alignment opening 532 is arranged on the accommodating box 530, the free end of the rolled plate 531 is connected with the side wall of the end of the guide rod 620 through the alignment opening 532, the guide rod 620 aligns the rolled plate 531 through the alignment opening 532 and then pulls out the rolled plate, specifically, the width of the rolled plate 531 is larger than the width of the open slot 610, two sides of the free end of the rolled plate 531 are slidably arranged in the sealing rubber gasket and sealed through the sealing rubber gasket and the open slot, when the second slide block is forced to slide, the guide rod is driven to move in the open slot, the guide rod is sealed with the open slot, and the open slot between the guide rod and the end of the second guide rail is sealed by the rolled, thereby avoiding leaking the hydraulic oil between the second sliding block and the end head of the inner space of the second guide rail from the groove.
The two ends of the first slider 330 are provided with first touch switches 332, the two ends of the second slider 520 are provided with second touch switches 521, the two ends of the third slider 700 are provided with third touch switches 710, the end of the second guide rail 540 is provided with an origin switch 640 in a protruding manner, the tail end of the second guide rail 540 is provided with a destination switch 360 in a protruding manner, each switch is connected with the controller, the end of the guide groove 630 is provided with a first baffle 650, the origin switch 640 is arranged on the first baffle 650, the tail end of the guide groove 630 is provided with a second baffle 370, the destination switch 360 is arranged on the second baffle 370, the touch switches generate contact signals which are sent to the controller, the controller controls the corresponding sliders to stop moving, namely the touch switches are used for limiting the moving stroke of the sliders and avoiding the sliders from directly colliding with the end or the tail end of the guide rail, the origin switch 640 and the destination switch 360 are used for calibrating the origin and the destination of the moving path of the third slider, the moving precision of the antenna is improved, and the accumulated error of the moving stroke is eliminated.
In this embodiment, each linear displacement mechanism is further provided with an oil tank, specifically, the oil tank is disposed on the T-shaped support, the two linear displacement mechanisms share one mailbox, each linear displacement mechanism is provided with an oil pump, an inlet of the oil pump is communicated with an oil outlet of the oil tank, an outlet of the oil pump is communicated with an inlet of the buffer through a first electromagnetic valve, an outlet of the buffer is communicated with an inner end of the second guide rail 540, the first electromagnetic valve is provided with a first flowmeter, an inner end of the second guide rail 540 is provided with a calibration oil return port, the calibration oil return port is communicated with the oil return port of the oil tank through a second electromagnetic valve, the second electromagnetic valve is provided with a second flowmeter, and each of the electromagnetic valves and the flowmeters is respectively connected with the controller.
A buffer is also arranged between the calibration oil return port and the second electromagnetic valve, hydraulic oil in the first guide rail flows back to the oil tank through the second electromagnetic valve after being buffered by the buffer, and the buffer reduces the instant impact of the flow of the hydraulic oil on the oil quantity in the first guide rail when the second electromagnetic valve is opened, so that the shaking of the second slider and scanning equipment arranged on the third slider is further reduced, the shaking of the scanning equipment is reduced on the premise of improving the scanning accuracy of the scanning equipment, the shaking of the scanning equipment is reduced, the scanning quality of the whole scanning equipment arranged on the third slider is improved, and the imaging quality of a scanning system is finally improved.
The controller controls the movement stroke of the third sliding block, scanning imaging of the antenna on the target object is achieved, and meanwhile the movement position and the movement distance of the third sliding block are fed back through the distance measuring module. The position deviation inevitably occurs when the position of the third slide block deviates from the target set position, for example, the position of the third slide block does not reach the target position, at this time, the controller calculates the deviation distance of the third slide block, because the longitudinal sectional area of the inner space of the second guide rail is constant, the deviation volume of the hydraulic oil in the inner space of the second guide rail can be calculated, the controller controls the oil pump to operate, simultaneously opens the first electromagnetic valve, the hydraulic oil in the oil tank is buffered by the buffer and then is supplemented to the inner space of the second guide rail, the first flow meter measures the volume of the hydraulic oil flowing in, when the hydraulic oil flowing in reaches the deviation volume, the oil pump and the first electromagnetic valve are controlled to be closed simultaneously, and after the hydraulic oil in the inner space of the second guide rail obtains the hydraulic oil with the deviation volume, the second slide block can be driven to be linked with the third slide block to reach, thereby eliminating displacement deviation in time and improving the scanning precision of the antenna.
For example, after the position of the third slider exceeds the target position for a certain distance, at the moment, the controller calculates the deviation distance of the third slider, because the longitudinal sectional area of the inner space of the second guide rail is fixed, the deviation volume of the hydraulic oil in the inner space of the second guide rail can be calculated, the second electromagnetic valve is opened, the hydraulic oil in the inner space of the second guide rail flows back to the oil tank, the second flowmeter measures the volume of the flowing hydraulic oil, when the flowing hydraulic oil reaches the deviation volume, the second electromagnetic valve is controlled to be closed at the same time, and after the hydraulic oil in the inner space of the second guide rail flows out, the second slider can be driven to be linked with the third slider to reach the specified target position, so that the displacement deviation is eliminated in time, and the scanning precision of the.
In this embodiment, the host computer communicates with the controller through a serial port, a display device is arranged on the host computer, the controller adopts a 52-chip microcomputer, and the system designs and manufactures a millimeter synthetic aperture radiometer antenna scanning platform by utilizing a host computer control system, a 42HBS48BL4-TF7 stepping motor and a driver thereof, a ball linear guide sliding table and the 52-chip microcomputer. The control and display of the scanning system on the upper computer are realized by utilizing the serial port communication between the upper computer and the single chip microcomputer, the operation of the scanning system is controlled, the operation parameters of the scanning system are modified, and the current sliding table position is displayed in real time, so that the operation is convenient, visual and flexible.
The parameter setting process of the scanning platform is as follows, when the serial port is smoothly opened, the parameters can be changed, and the default parameters are as follows: scanning 50 points in the horizontal direction, namely n1 is 50, and the scanning step is 20mm, namely l1 is 20 mm; scanning 25 points in the vertical direction, namely n 2-25, and scanning step length is 20mm, namely l 2-20 mm; the residence time per step is 1s, i.e. t is 1 s.
It should be noted that the effective stroke of the sliding table in the horizontal direction is 1000mm, and the effective stroke of the sliding table in the vertical direction is 500mm, so the parameters of the scanning platform must satisfy n1 × l1 is less than or equal to 1000mm, and n2 × l2 is less than or equal to 500mm, otherwise the sliding table will move beyond the end, causing serious damage to the system. Certainly, the system successfully solves the problem, when the serial port is opened successfully, the upper computer sends an instruction to inquire 52 the current scanning platform parameters of the single chip microcomputer through the serial port and displays the parameters in an interface, and meanwhile, the limitation prompt of the parameters can be displayed according to the current parameters.
When the system operates, in order to conveniently observe the position of the sliding table of the scanning system, the function of displaying the real-time position of the sliding table is designed, including character display and image display, and the upper computer draws a T-shaped scanning platform schematic diagram according to the position information sent by the single chip microcomputer through the serial port and identifies the position of the sliding table in the diagram. By means of an image display method, the real-time position of the sliding table can be clearly and visually displayed on the upper computer. Of course, the image identification is inaccurate, so that the position information of character display is also provided, and the position of the sliding table can be clearly confirmed by matching the characters and the image for display.
In order to verify the effect of the platform, a 5mW laser is used as a testing tool, the 5mW laser is arranged on the third sliding block, and the stability of the system during operation and the shaking condition of the sliding table during operation are tested. And recording the set running distance and the actual running distance of the sliding table during running, and testing the accuracy of the system. Finally, the test system outputs a waveform, and the pulse is sent to a subsequent radiometer measurement system to be used as a prompt signal of the radiometer measurement system to analyze the accuracy of the radiometer measurement system.
Tests prove that the third sliding block has small shake during the operation of the system, the shake in the vertical direction is much smaller than that in the horizontal direction, and the shake caused by the operation of the motor is small and the system is stable after being absorbed by a hydraulic system. Meanwhile, the error between the set position and the actual position of the system operation is almost zero, so that the system operation accuracy is high. The line feed pulse signal is generated every 6 test pulse signals, and the pulses are all sent out just after the sliding table stops in each operation step, so that enough time for acquiring data is reserved for a subsequent test system, including the fact that the sliding table has one test pulse when the system just starts to operate but does not operate at an initial value point, and therefore the design completely meets the system requirements.
According to the invention, the serial port communication between the upper computer and the singlechip is utilized to realize the control and display of the scanning system on the upper computer, including the control and control of the scanning system, the modification of the operating parameters of the scanning system and the real-time display of the current sliding table position, so that the control process of the scanning platform is optimized; meanwhile, the method has the characteristics of high precision, simplicity and convenience in operation, good stability, high safety and the like, and provides a necessary platform foundation for high-precision imaging of the millimeter wave synthetic aperture radiometer; finally, the moving process of the sliding table is more accurate, the shaking of the sliding table is eliminated, and the imaging quality is improved.
While embodiments of the invention have been described above, it is not limited to the applications set forth in the description and the embodiments, which are fully applicable to various fields of endeavor for which the invention may be embodied with additional modifications as would be readily apparent to those skilled in the art, and the invention is therefore not limited to the details shown and described herein without departing from the general concept defined by the claims and their equivalents.
Claims (10)
1. A scanning platform for an imaging radiometer, comprising:
a T-shaped bracket;
a first linear displacement mechanism provided on a lateral bracket of the T-shaped bracket;
the second linear displacement mechanism is arranged on the longitudinal support of the T-shaped support;
the oil pump is communicated with each linear displacement mechanism and an oil tank;
a controller connecting each of the linear displacement mechanisms and the oil pump; and
the upper computer is communicated with the controller through a serial port, and a display device is arranged on the upper computer;
each of the linear displacement mechanisms includes:
a drive mechanism connected to the controller;
the first guide rail is of a closed structure, a screw rod connected with a driving shaft of the driving mechanism is arranged in the first guide rail along the length direction, a brake controlled by the controller is arranged on the outer side wall of the tail end of the first guide rail, a retractable brake hoop is arranged on the brake, a brake pad is arranged on the inner side wall of the brake hoop, the brake is arranged on the first guide rail through a damping mechanism, and the tail end of the screw rod protrudes out of the outer side wall of the tail end of the first guide rail for a certain distance and extends into the brake hoop;
the first sliding block is arranged in the first guide rail in a sliding mode, and the first sliding block is sleeved on the screw rod;
the second guide rail is arranged at the upper end of the first guide rail, the inner space of the second guide rail is communicated with the inner space of the first guide rail at the end head, and the upper end of the second guide rail is covered by a cover plate with a slot;
the second sliding block is arranged in the second guide rail in a sliding mode, hydraulic oil is filled between the first sliding block and the end head of the first guide rail and between the second sliding block and the end head of the second guide rail, and a guide rod extends upwards from the groove at the upper end of the second sliding block;
the third sliding block is connected to the upper end of the guide rod, is arranged on the cover plate in a sliding mode, and is connected with a rolling plate for sealing the groove; and
the distance measuring module is arranged at the tail end of the second guide rail, a distance measuring port of the distance measuring module is aligned to the tail end of the third sliding block, and the output end of the distance measuring module is connected with the controller;
the oil pump is connected with an inlet of a buffer through an electromagnetic valve, hydraulic oil is filled in the buffer, the longitudinal sectional area of the buffer is not smaller than that of the second guide rail, an outlet of the buffer is communicated with the inner end space of the second guide rail, and a flow meter is arranged on the electromagnetic valve.
2. The scanning platform of claim 1, wherein each linear displacement mechanism is mounted on the T-shaped support via a mounting base, the driving mechanism is a stepping motor, and the driving mechanism is drivingly connected to the lead screw via a connecting base.
3. The scanning platform of claim 2, wherein a longitudinal cross section of the first sliding block is consistent with a longitudinal cross section of the inner space of the first guide rail, first guide grooves are formed on two inner side walls of the first guide rail, first guide blocks are correspondingly arranged on the side walls of the first sliding block, the first guide blocks are slidably arranged in the first guide grooves, and a first sealing ring is arranged on the periphery of the end head of the first sliding block.
4. The scanning platform of claim 3, wherein a threaded hole is formed in the center of the first slider along the length direction, the first slider is sleeved on the screw rod through the threaded hole, and a thread sealing sleeve is arranged between the threaded hole and the screw rod.
5. The scanning platform of claim 4, wherein the upper end of the first rail is sealed with a first cover plate, and a plurality of through holes are formed at the end of the first cover plate; the second guide rail is arranged at the upper end of the first cover plate, and the inner space of the second guide rail is communicated with the inner space of the first guide rail through the through hole.
6. The scanning platform of claim 5, wherein the longitudinal section of the second slider is consistent with the longitudinal section of the inner space of the second guide rail, the second guide rail is provided with second guide grooves on two inner side walls, the second slider is correspondingly provided with second guide blocks on the side walls, the second guide blocks are slidably arranged in the second guide grooves, and the periphery of the end head of the second slider is provided with a second sealing ring.
7. The scanning platform of claim 6, wherein the upper end of the second guide rail is sealed by a second cover plate, the second cover plate has a guide slot, the third slider is slidably disposed on the guide slot via the guide rod, the slot is disposed through the center of the second cover plate along the length direction, the two inner sidewalls of the slot have a third guide groove, the two sidewalls of the guide rod have a third guide block, and the third guide groove has a sealing rubber pad disposed therein, and the third guide block is slidably disposed in the sealing rubber pad.
8. The scanning platform of claim 7, wherein a receiving box is disposed outside the second guiding rail, a flexible rolling device is disposed inside the receiving box, the rolling plate is disposed around the flexible rolling device, an alignment opening is disposed on the receiving box, a free end of the rolling plate is connected to the sidewall of the end of the guide rod through the alignment opening, a width of the rolling plate is greater than a width of the slot, and two sides of the free end of the rolling plate are slidably disposed in the rubber gasket.
9. The scanning platform of claim 8, wherein the first slider has a first touch switch at two ends, the second slider has a second touch switch at two ends, the third slider has a third touch switch at two ends, the second guide rail has an origin switch at one end, the second guide rail has an end switch at the other end, and each of the switches is connected to the controller.
10. The scanning platform for an imaging radiometer according to claim 9, wherein the oil tank is disposed on the T-shaped support, the inlet of the oil pump is communicated with the oil outlet of the oil tank, the outlet of the oil pump is communicated with the inlet of the buffer through a first solenoid valve, the first solenoid valve is provided with a first flow meter, the inner end of the second guide rail is provided with a calibration oil return port, the calibration oil return port is communicated with the oil tank oil return port through a second solenoid valve, the second solenoid valve is provided with a second flow meter, and each of the solenoid valve and the flow meter is respectively connected to the controller.
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| CN108758189B true CN108758189B (en) | 2020-02-04 |
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| CN114002732B (en) * | 2021-11-11 | 2022-11-11 | 佛山市职业病防治所 | Automatic moving device of radiation dose detector |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US5852419A (en) * | 1992-10-07 | 1998-12-22 | Trw Inc. | Rotating mirror drum radiometer imaging system |
| CN2530354Y (en) * | 2001-12-12 | 2003-01-08 | 中国科学院空间科学与应用研究中心 | Star loaded rotary scanning imaging microwave radiometer |
| US7516934B2 (en) * | 2006-02-24 | 2009-04-14 | Bio-Rad Laboratories, Inc. | Sample plate support of adjustable angular orientation |
| CN201584096U (en) * | 2009-12-30 | 2010-09-15 | 杭州大华仪器制造有限公司 | Heat radiation and infrared scanning imaging experimental device |
| CN103307418B (en) * | 2013-05-21 | 2015-04-22 | 华南理工大学 | Two-degree-of-freedom tandem scanning platform |
| CN103278237B (en) * | 2013-05-30 | 2015-03-25 | 中国电子科技集团公司第四十一研究所 | Device and method for optical radiation calibration |
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