CN108871405B - On-board visible light calibration device of space optical telescope - Google Patents
On-board visible light calibration device of space optical telescope Download PDFInfo
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- CN108871405B CN108871405B CN201810326028.2A CN201810326028A CN108871405B CN 108871405 B CN108871405 B CN 108871405B CN 201810326028 A CN201810326028 A CN 201810326028A CN 108871405 B CN108871405 B CN 108871405B
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- 230000003287 optical effect Effects 0.000 title claims abstract description 29
- 230000007246 mechanism Effects 0.000 claims abstract description 24
- 230000005540 biological transmission Effects 0.000 claims abstract description 23
- 239000003638 chemical reducing agent Substances 0.000 claims description 9
- 230000008878 coupling Effects 0.000 claims description 7
- 238000010168 coupling process Methods 0.000 claims description 7
- 238000005859 coupling reaction Methods 0.000 claims description 7
- 239000004642 Polyimide Substances 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- 229920001721 polyimide Polymers 0.000 claims description 3
- -1 polytetrafluoroethylene Polymers 0.000 claims description 3
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 3
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 3
- 229910000838 Al alloy Inorganic materials 0.000 claims description 2
- 239000000956 alloy Substances 0.000 claims description 2
- 238000005245 sintering Methods 0.000 claims description 2
- 230000000737 periodic effect Effects 0.000 abstract description 4
- 238000001514 detection method Methods 0.000 description 7
- 230000008859 change Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000002329 infrared spectrum Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D18/00—Testing or calibrating apparatus or arrangements provided for in groups G01D1/00 - G01D15/00
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Abstract
The invention relates to a space optical telescope, in particular to an on-satellite visible light calibration device of the space optical telescope. The device comprises an LED calibration source, a diffuse reflection plate, a calibration transmission mechanism, a driver, a fixed seat and a detector mounting shell. The driver drives the calibration transmission mechanism to drive the diffuse reflection plate to rotate between the calibration position and the non-calibration position, so that the periodic calibration of the detector is realized. The invention has the characteristics of compact structure, light weight and high reliability, and meets the on-board flat field calibration requirement of a satellite-borne optical instrument.
Description
Technical Field
The invention relates to a space optical telescope, in particular to an on-satellite calibration device of the space optical telescope. The method is used for flat field calibration of the space optical telescope in the visible light wave band and the near infrared wave band.
Background
In the transportation and emission processes, the parameters of the optical machine structure of the satellite-borne optical instrument are changed due to the influence of random vibration, acceleration impact, physical environment change and other factors. During in-orbit operation, the radiation characteristics of the instrument will also change due to reduced efficiency of the optics, degradation of the detector and electronics. When the satellite-borne optical instrument runs stably on orbit, if the calibration coefficient measured in a laboratory calibration test before emission is continuously used, larger errors occur in the data obtained by the detector, and the application of remote sensing data is influenced. One of the solutions to this problem is to equip the on-board optical instrument with an on-board calibration system to perform on-orbit periodic calibration of the instrument.
Currently, for on-board calibration systems in the near infrared spectrum of the visible light, built-in standard calibration lamps and sunlight are generally used as calibration light sources. The built-in standard calibration lamp is more common in on-board calibration of a satellite-borne optical instrument than sunlight, has more advantages in short-term change of response of a detection system, is positioned in a satellite platform, can receive instruction control in real time, and performs frequent calibration operation. The sunlight is used as a calibration light source, the calibration error is easily caused by the change of the angle of the sun, the relative position and the gesture of the sun and a satellite-borne optical instrument are required to be detected during calibration, the control is complex, and the implementation is more difficult.
The existing standard lamp calibration method is characterized in that two modes are adopted: on-board calibration of the lamp and diffuse reflecting plate combination and on-board calibration of the lamp and integrating sphere combination. However, only one concept of the two ways is put forward, no real description of relevant substantial technology is disclosed, meanwhile, the installation space required by the on-board calibration of the diffuse reflection plate is small, and how to well meet the requirement of the on-board calibration system of the space on-board optical instrument on light weight and miniaturization is a technical problem which needs to be solved urgently at present.
Disclosure of Invention
In order to solve the problems in the background technology, the invention provides the on-satellite visible light calibration device of the space optical telescope, which has a compact structure and light weight and can realize on-track accurate calibration.
The specific technical scheme of the invention is as follows:
A calibrating device for on-satellite visible light comprises an LED calibrating source, a diffuse reflection plate, a calibrating transmission mechanism, a driver, a fixing seat and a detector mounting shell;
The fixing seat is composed of a vertical part and a horizontal part which are mutually and vertically fixedly connected;
the LED calibration source comprises a light source composed of a plurality of groups of LED lamps with different wavelengths, an annular circuit board and a circuit board fixing bracket; the LED lamps are uniformly arranged on the annular circuit board along the circumferential direction, and the annular circuit board is arranged on the upper surface of the horizontal part of the fixed seat through a circuit board fixing bracket;
the detector mounting shell is mounted on the lower surface of the horizontal part of the fixing seat and is positioned right below the LED calibration source; the detector to be calibrated is arranged in the detector mounting shell;
the calibration transmission mechanism is fixedly arranged at the vertical part of the fixed seat, the input end of the calibration transmission mechanism is connected with the driver, and the output end of the calibration transmission mechanism is provided with the diffuse reflection plate;
the diffuse reflection plate is located right above the LED calibration source. In the structural description disclosed by the scheme, when the diffuse reflection plate is positioned right above the LED calibration source, the diffuse reflection space of the LED lamp is formed by the diffuse reflection plate, the circuit board fixing support, the fixing seat horizontal part and the detector mounting shell from top to bottom, and light emitted by the LED lamp is reflected to the detector to be calibrated by the diffuse reflection plate, so that the periodic on-orbit flat field calibration of the detector is realized.
In order to limit the position precision of the diffuse reflection plate at the respective positions, and ensure that the vibration amplitude of the diffuse reflection plate is limited when the equipment is disturbed during the track running, so as to avoid collision with other optical elements nearby, the device also comprises a first stop block and a second stop block; the first stop block and the second stop block are both arranged on the fixed seat, the first stop block is positioned at the calibration position, and the second stop block is positioned at the non-calibration position; the first stop block comprises a vertical plate and two horizontal plates; the two horizontal plates are parallel to each other and are vertically and fixedly connected to the vertical plate, and the distance between the two opposite surfaces of the two horizontal plates is larger than the thickness of the diffuse reflection plate (in the practical case, the vertical distance between the two opposite surfaces of the two horizontal plates and the diffuse reflection plate is 1 mm up and down respectively);
The first stop block and the second stop block have the same structure.
The calibration position is a state when the diffuse reflection plate is positioned right above the LED calibration source and light of all the LED lamps can be diffusely reflected on the detector;
The non-calibration position is the detection state of the detector to be calibrated on the external target, namely the state when the diffuse reflection plate is completely far away from the position right above the LED calibration source.
Further, inner liners made of polyimide materials are arranged on two opposite surfaces of the two horizontal plates.
In order to ensure that the movement precision of the diffuse reflection plate is higher, the movement is unidirectional, and the reverse self-locking can be realized, the calibration transmission mechanism comprises a worm wheel, a worm, a flexible coupling, a speed reducer box body and a potentiometer; the speed reducer box body is fixed on the vertical portion of fixing base, and the worm wheel is given through the worm with power transmission to the driver, and the worm wheel is provided with a connecting axle along self axis direction, and the one end of connecting axle passes the speed reducer box body after being connected with the potentiometre through flexible shaft coupling, and the other end passes the speed reducer box body after being connected with the diffuse reflection board.
Further, the device also comprises a rotating frame, one end of the rotating frame is fixed with the connecting shaft, and the other end of the rotating frame is provided with a diffuse reflection plate.
Further, in order to meet the detection requirements of the detector to be calibrated under various wavelength conditions, the light source consists of six groups of LED lamps with different wavelengths, the wavelength range is 400-1000 nm, and visible light and near infrared light are covered.
Further, the number of the LED lamps in each group is not less than 3 and the LED lamps are uniformly distributed in the circumferential direction, each LED lamp in each group can emit light independently, the wavelengths of two adjacent LED lamps in adjacent groups are identical, and the two adjacent LED lamps are mutually backup.
Further, the diffuse reflection plate is sintered by polytetrafluoroethylene, and the uniformity of the reflectance is better than 0.97.
Further, the driver is a stepping motor.
Further, in order to make the whole device lighter, the vertical plate, the horizontal plate and the rotating frame are all made of aluminum alloy materials.
The invention has the advantages that:
1. The device provided by the invention adopts the LED calibration source, the diffuse reflection plate, the calibration transmission mechanism, the driver, the fixed seat and the space optical telescope formed by the detector mounting shell, so that the device is compact in structure, light in weight, capable of realizing on-orbit accurate calibration and free from influencing normal detection work of the detector in the on-orbit operation process.
2. The calibration transmission mechanism adopts a single-head worm and gear mechanism with unidirectional transmission characteristic, so that a special locking and releasing device is omitted, and the structure is compact;
3. the potentiometer is adopted in the calibration transmission mechanism to monitor the rotation angle of the diffuse reflection plate in real time, and a given calibration control person is fed back to form closed-loop control, so that the control is safe and reliable.
4. The invention adopts the two stop blocks to limit the position precision of the diffuse reflection plate at the respective positions, limit the vibration amplitude of the diffuse reflection plate when the telescope is disturbed, protect other nearby optical elements and improve the reliability and safety of the device.
5. The light source of the invention is composed of a plurality of groups of LED lamps with different wavelengths, the wavelength range is 400-1000 nm, and the detection requirements of the detector to be calibrated under various wavelength conditions are satisfied.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a cross-sectional view of the general structure of the present invention;
The reference numerals are as follows:
1-LED calibration source, 11-light source, 12-annular circuit board, 13-circuit board fixed bolster, 2-diffuse reflection board, 3-calibration drive mechanism, 31-worm wheel, 32-worm, 33-flexible coupling, 34-reduction gear box, 35-connecting axle, 36-rotation framework, 4-driver, 5-second stop, 6-first stop, 61-vertical board, 62-horizontal plate, 63-inside lining, 7-potentiometre, 8-fixing base, 81-vertical portion, 82-horizontal portion, 9-detector to be calibrated, 10-detector installation casing.
Detailed Description
The following describes the embodiments of the present invention further with reference to the accompanying drawings.
As shown in fig. 1, the present invention provides an on-board visible light calibration device of a space optical telescope, mainly comprising: LED calibration light source 1, diffuse reflection plate 2, calibration transmission mechanism 3, driver 4, second stop block 5, first stop block 6, potentiometer 7, fixing seat 8, detector 9 to be calibrated and detector mounting shell 10
The connection and position of each part in the device are shown in fig. 1 and 2:
The fixed seat 8 is composed of a vertical part 81 and a horizontal part 82 which are mutually and vertically fixedly connected, and the LED calibration source 1 comprises a light source 11, an annular circuit board 12 and a circuit board fixing bracket 13, wherein the light source 11 is composed of a plurality of groups of LED lamps with different wavelengths; the LED lamps are uniformly arranged on the annular circuit board 12 along the circumferential direction, and the annular circuit board 12 is arranged on the upper surface of the horizontal part 82 of the fixed seat through the circuit board fixing bracket 13;
The detector mounting shell 10 is mounted on the lower surface of the horizontal part 82 of the fixed seat and is positioned right below the LED calibration source 1; the detector to be calibrated is arranged in the detector mounting shell 10;
The calibration transmission mechanism 3 is fixedly arranged on the fixed seat 8, wherein the calibration transmission mechanism comprises a worm wheel 31, a worm 32, a flexible coupling 33, a speed reducer box 34 and a potentiometer 7; the reducer box 34 is fixed on the vertical part 81 of the fixed seat, the driver 4 transmits power to the worm wheel 31 through the worm 32, the worm wheel 31 is provided with a connecting shaft 35 along the axis direction of the driver, one end of the connecting shaft 35 passes through the reducer box 34 and then is connected with the potentiometer 7 through the flexible coupling 33, and the other end passes through the reducer box 34 and then is connected with the diffuse reflection plate 2 through the rotating frame 36.
The diffuse reflection plate 2 is located directly above the LED scaling source 1.
In the structural description of the above scheme, when the diffuse reflection plate is located right above the LED calibration source, the diffuse reflection plate 2, the circuit board fixing bracket 13, the fixing base horizontal portion 82 and the detector mounting housing 10 form a diffuse reflection space of the LED lamp from top to bottom, and the diffuse reflection plate is used to diffuse reflect light emitted by the LED lamp to the detector to be calibrated, so as to realize periodic on-track flat field calibration of the detector.
Wherein, the first stop block 6 and the second stop block 5 are both arranged on the fixed seat 8, the first stop block 6 is positioned at the calibration position, and the second stop block 5 is positioned at the non-calibration position; the first stopper 6 includes a vertical plate 61 and two horizontal plates 62; the two horizontal plates 62 are parallel to each other and vertically fixedly connected to the vertical plate 61, and the distance between the two opposite surfaces of the two horizontal plates 62 is greater than the thickness of the diffuse reflection plate 2; the first stopper 6 and the second stopper 5 have the same structure. The two horizontal plates 62 are provided with inner liners 63 made of polyimide material on opposite surfaces thereof.
The points to be explained are: the calibration position is a state when the diffuse reflection plate is positioned right above the LED calibration source and light of all the LED lamps can be diffusely reflected on the detector;
The non-calibration position is the detection state of the detector to be calibrated on the external target, namely the state when the diffuse reflection plate is completely far away from the position right above the LED calibration source.
Description of the main components in this embodiment:
1. The LED calibration light source 1 consists of six groups of LED lamps with different wavelengths, and the wavelength range is 400-1000 nm, and the visible light and the near infrared are covered. The full width at half maximum (FWHM) of each LED lamp is not less than 20nm, the number of each LED lamp is not less than 3, each LED lamp can emit light independently, and each LED adopts a main part and a backup.
2. The diffuse reflection plate 2 is formed by sintering polytetrafluoroethylene, and the uniformity of the reflectance is better than 0.97.
3. The calibration transmission mechanism 3 is a worm and gear transmission mechanism. The worm is a single-head worm, the movement is unidirectional, and the reverse self-locking can be realized. The worm shaft is supported by a pair of space-level angular contact ball bushings and the worm shaft is supported by a pair of space-level deep groove ball bearings.
4. The driver 4 is a space-level stepping motor. During calibration, the potentiometer 7 monitors the rotation angle of the diffuse reflection plate in real time, assists in controlling the driving of the stepping motor, and prevents the stepping motor from losing rotation.
5. The first stop 6 is in the calibration position (position 1) and the second stop 5 is in the non-calibration position (position 2). The main function is to limit the vibration amplitude of the diffuse reflection plate in the satellite transmitting stage and the rotation angle in the in-orbit calibration stage.
The on-orbit working principle of the device is as follows:
1. on-orbit calibration of detector
The stepping motor drives the diffuse reflection plate to rotate to a calibration position (position 1) through the calibration rotating mechanism, the diffuse reflection plate, the circuit board fixing support, the fixing seat horizontal part and the detector mounting shell form a diffuse reflection space of the LED lamp, and the detector is calibrated through the LED lamps with different wavelengths. After the calibration of the detector is completed, the detector detects the actual target object.
2. Actual target detection
The stepping motor drives the diffuse reflection plate to rotate to a non-calibration position (position 2) through the calibration rotating mechanism, and the calibrated detector detects the target object on the track.
In addition, the non-detailed portions of the present invention are well known to those skilled in the art.
Claims (9)
1. An on-board visible light calibration device of a space optical telescope is characterized in that: the LED calibration device comprises an LED calibration source, a diffuse reflection plate, a calibration transmission mechanism, a driver, a fixed seat and a detector mounting shell;
The fixing seat is composed of a vertical part and a horizontal part which are mutually and vertically fixedly connected;
The LED calibration source comprises a light source composed of a plurality of groups of LED lamps with different wavelengths, an annular circuit board and a circuit board fixing bracket; the LED lamps are uniformly distributed on the annular circuit board along the circumferential direction, and the annular circuit board is arranged on the upper surface of the horizontal part of the fixed seat through a circuit board fixing bracket;
the detector mounting shell is mounted on the lower surface of the horizontal part of the fixing seat and is positioned right below the LED calibration source; the detector to be calibrated is arranged in the detector mounting shell;
the calibration transmission mechanism is fixedly arranged at the vertical part of the fixed seat, the input end of the calibration transmission mechanism is connected with the driver, and the output end of the calibration transmission mechanism is provided with the diffuse reflection plate;
The diffuse reflection plate is positioned right above the LED calibration source;
The calibration transmission mechanism comprises a worm wheel, a worm, a flexible coupling, a speed reducer box body and a potentiometer; the reduction gear box is fixed on the vertical portion of fixing base, and the worm wheel is given through the worm with power transmission to the driver, and the worm wheel is provided with a connecting axle along self axis direction, and the one end of connecting axle passes behind the reduction gear box and is connected with the potentiometre of installing vertical portion top through flexible shaft coupling, and the other end passes behind the reduction gear box and is connected with the diffuse reflection board.
2. The on-board visible light calibration device of the space optical telescope according to claim 1, wherein: the device also comprises a first stop block and a second stop block;
The first stop block and the second stop block are both arranged on the fixed seat, the first stop block is positioned at the calibration position, and the second stop block is positioned at the non-calibration position; the first stop block comprises a vertical plate and two horizontal plates; the two horizontal plates are parallel to each other and are vertically and fixedly connected to the vertical plate, and the distance between the two opposite surfaces of the two horizontal plates is greater than the thickness of the diffuse reflection plate; the first stop block and the second stop block have the same structure.
3. The on-board visible light calibration device of the space optical telescope according to claim 2, wherein: the two opposite surfaces of the two horizontal plates are provided with inner liners made of polyimide materials.
4. The on-board visible light calibration device of the space optical telescope according to claim 3, wherein: the novel solar energy collecting device further comprises a rotating frame, one end of the rotating frame is fixed with the connecting shaft, and the diffuse reflection plate is arranged at the other end of the rotating frame.
5. The on-board visible light calibration device of the space optical telescope according to claim 4, wherein: the number of the LED lamps in each group is not less than 3 and the LED lamps are uniformly distributed in the circumferential direction, each LED lamp in each group can emit light independently, the wavelengths of two adjacent LED lamps in adjacent groups are identical, and the two adjacent LED lamps are mutually backup.
6. The on-board visible light calibration device of the space optical telescope according to claim 5, wherein:
The light source consists of six groups of LED lamps with different wavelengths, the wavelength range is 400-1000 nm, and visible light and near infrared light are covered.
7. The on-board visible light calibration device of the space optical telescope according to claim 6, wherein: the diffuse reflection plate is formed by sintering polytetrafluoroethylene, and the uniformity of the reflectance is better than 0.97.
8. The on-board visible light calibration device of the space optical telescope according to claim 7, wherein: the driver is a stepping motor.
9. The on-board visible light calibration device of the space optical telescope according to claim 8, wherein: the vertical plate, the horizontal plate and the rotating frame are all made of aluminum alloy materials.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810326028.2A CN108871405B (en) | 2018-04-12 | 2018-04-12 | On-board visible light calibration device of space optical telescope |
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| CN201810326028.2A CN108871405B (en) | 2018-04-12 | 2018-04-12 | On-board visible light calibration device of space optical telescope |
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| CN110531482B (en) * | 2019-08-28 | 2020-06-26 | 中国科学院西安光学精密机械研究所 | Flexible high-precision secondary mirror assembly focusing mechanism |
| CN110864707B (en) * | 2019-11-21 | 2021-05-07 | 长光卫星技术有限公司 | High-reliability high-self-locking-capacity calibration mechanism |
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