CN113281014A - Dynamic scene simulation system and method for space camera test - Google Patents
Dynamic scene simulation system and method for space camera test Download PDFInfo
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- CN113281014A CN113281014A CN202110602752.5A CN202110602752A CN113281014A CN 113281014 A CN113281014 A CN 113281014A CN 202110602752 A CN202110602752 A CN 202110602752A CN 113281014 A CN113281014 A CN 113281014A
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- 238000004088 simulation Methods 0.000 title claims abstract description 65
- 238000012360 testing method Methods 0.000 title claims abstract description 24
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- 230000003068 static effect Effects 0.000 claims abstract description 12
- 238000003384 imaging method Methods 0.000 claims abstract description 10
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- 230000008859 change Effects 0.000 claims abstract description 3
- 238000013519 translation Methods 0.000 claims description 16
- 238000005286 illumination Methods 0.000 claims description 15
- 230000003287 optical effect Effects 0.000 claims description 12
- 229910052736 halogen Inorganic materials 0.000 claims description 4
- 150000002367 halogens Chemical class 0.000 claims description 4
- 238000009434 installation Methods 0.000 claims description 4
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 claims description 4
- 229910052721 tungsten Inorganic materials 0.000 claims description 4
- 239000010937 tungsten Substances 0.000 claims description 4
- 230000005294 ferromagnetic effect Effects 0.000 claims description 3
- 229910052751 metal Inorganic materials 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims description 3
- 238000012545 processing Methods 0.000 claims description 2
- 239000013077 target material Substances 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 230000010354 integration Effects 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
- G01M11/02—Testing optical properties
- G01M11/0207—Details of measuring devices
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64G—COSMONAUTICS; VEHICLES OR EQUIPMENT THEREFOR
- B64G7/00—Simulating cosmonautic conditions, e.g. for conditioning crews
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Abstract
The invention discloses a dynamic scene simulation system and a method for testing a space camera. The system comprises a dynamic scene simulation device and a collimator for generating an infinite-distance scene object, wherein the dynamic scene simulation device is placed at the focal plane of the collimator and is used for providing a dynamic imaging scene; the dynamic scene simulation device comprises a driving mechanism, a roller, an illuminating light source, a target and a base, wherein the length l of the roller is larger than or equal to the linear view field of the collimator, the roller can change the rotating direction and the rotating speed under the control of the driving mechanism, the illuminating light source is arranged in the focal front area of the collimator, the target is coated on the roller, and the driving mechanism, the roller and the illuminating light source are all arranged on the base. The system of the invention has simple structure and convenient assembly; the dynamic target material is magnetic photographic paper, and the target is convenient to install and switch; the target adopts a printing mode, so that the cost is low; the switching between the dynamic scene function and the static scene function is simple.
Description
Technical Field
The invention belongs to the technical field of optical testing, and particularly relates to a dynamic scene simulation system and method for testing a space camera.
Background
Space cameras typically operate at heights of hundreds to thousands of kilometers. After the complete camera is assembled, imaging quality test needs to be carried out in a laboratory. During testing, a scene simulation system is usually adopted to provide infinite scene targets as the signal input of the camera, and is used for simulating the ground state of the camera during in-orbit flight.
Scene simulation includes static scene simulation and dynamic scene simulation. Static scene simulation can provide a static infinity target for determining the static imaging performance of the camera, i.e. the static transfer function of the camera at different frequencies; the dynamic scene simulation can provide a dynamic target at infinity for the camera to be tested, and the dynamic imaging test of the camera is carried out to determine the push-scanning rationality, the integration time, the integration delay characteristic and the like of the camera.
The scene simulation system comprises a collimator, an illumination light source, a target, an adjusting device and the like. During static scene simulation, the reticle arranged on the focal plane of the collimator is illuminated by the light source to form parallel light which is emitted, enters a lens of the CCD camera, is received by the CCD and is converted into corresponding electric signals to be output, and the contrast test of the imaging quality of the camera can be carried out. Common schemes for dynamic scene simulation are prism imaging film, LCD splicing, projector splicing, moving film, etc. The disadvantages of these solutions are as follows: in the prism imaging film method, the optical part is adjusted and complicated, and the precision requirement is high; the LCD method has too small visual deflection angle, so that larger brightness and color distortion can be generated when the LCD method is seen from the side, the image trailing phenomenon is easy to generate, and the problem of 'dead pixel' of liquid crystal is difficult to solve; the color uniformity and the brightness uniformity of each spliced LCD screen are difficult to adjust, and the overall effect is poor due to the large number of spliced seams; the projector has low splicing brightness, high price and poor contrast, and the image edge is easy to generate rainbow phenomenon; the film in the moving film method is not well preserved.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a novel dynamic scene simulation system and method for space camera testing.
The technical scheme adopted by the invention is as follows:
a dynamic scene simulation system for space camera test comprises a dynamic scene simulation device and a collimator for generating infinite distant scene targets, wherein the dynamic scene simulation device is placed at the focal plane of the collimator and used for providing dynamic imaging scenes; the dynamic scene simulation device comprises a driving mechanism, a roller, an illuminating light source, a target and a base, wherein the length l of the roller is larger than or equal to the linear view field of the collimator, the roller can change the rotating direction and the rotating speed under the control of the driving mechanism, the illuminating light source is arranged in the focal front area of the collimator, the target is coated on the roller, and the driving mechanism, the roller and the illuminating light source are all arranged on the base.
Furthermore, the dynamic scene simulation device further comprises a translation table, the base is fixed on the translation table, and the translation table can drive the mechanism above the translation table to move back and forth along the direction of the optical axis.
Further, the roller is machined and formed by ferromagnetic metal, and the target is printed by magnetic photographic paper in a printing mode.
Furthermore, the dynamic scene simulation device adopts a lateral illumination mode, the central line of the light source is aligned to the center of the focal plane, and the installation angle is beta.
Furthermore, beta is an included angle between the central line of the light source and the central line of the roller, and the value range of beta is 20-90 degrees.
Further, the lighting source is an LED lamp strip or a halogen tungsten lamp.
Further, when the device is used for generating an infinite target, the position of the roller wheel satisfies the following conditions:
1) the central line of the roller is superposed with the optical axis of the collimator;
2) the roller is tangent to the focal plane of the collimator;
3) except for the tangent position, the rest part of the roller is positioned in the focal area of the collimator.
Furthermore, the dynamic scene simulation device is arranged on one side of the collimator, the camera to be detected is arranged on the other side of the collimator, if the focal depth of the collimator is 2a and the radius of the roller is r, the target range observed by the camera to be detected is within the range of 2a, and the target range is within the range of 2a
A method for dynamic scene simulation for space camera testing, comprising:
turning on an illumination light source, and driving the roller and the target coated above to rotate at a preset speed so as to provide an infinite dynamic scene target; the dynamic scenery simulation device is integrally moved out of a focal plane, a reticle is placed on the focal plane, and a light source is placed in a focal back area of the collimator tube and used as a static scenery simulation system.
Printing a plurality of character patterns and picture patterns on the magnetic photographic paper; when a certain target needs to be used, adjusting the rotating speed of the roller, and selecting the placing direction of the target according to the rotating direction of the roller; when the picture needs to be replaced, the edge of the target is held, the roller is rotated, the target is taken out, and then a new picture is put in.
Furthermore, the translation platform is adjusted to enable all the mechanisms above to move back and forth along the optical axis direction, and dynamic scene targets with different distances are provided for the camera to be measured.
Compared with the prior art, the invention has the following advantages:
the system of the invention has simple structure and convenient assembly; the dynamic target material is magnetic photographic paper, and the target is convenient to install and switch; the target of the invention adopts a printing mode, so that the cost is low; the invention has simple switching between the dynamic scenery function and the static scenery function.
Drawings
FIG. 1 is a schematic diagram of a dynamic scene simulation system.
Fig. 2 is a front view of the dynamic scene simulation apparatus.
Fig. 3 is a side view of the dynamic scene simulation apparatus.
FIG. 4 shows a target range at a given time.
Fig. 5 is a schematic diagram of camera testing.
Fig. 6 is a block diagram of a dynamic scene simulation system.
FIG. 7 shows a target pattern.
The labels in the figure are: 1: a dynamic scene simulation device; 2: a collimator; 3: a motor; 4: a roller; 5: an illumination light source; 6: a target; 7: a base; 8: a translation stage; 9: a scorched surface; 10: a pre-focal region; 11: a light source centerline; 12: the central line of the roller; 13: a post-coking zone; 14: a camera; 15: an off-axis RC collimator.
Detailed Description
The invention is further described below in conjunction with a dynamic scene simulation system:
the present embodiment provides a dynamic scene simulation system for space camera test as shown in fig. 1, which comprises a collimator 2 and a dynamic scene simulation device 1, wherein the collimator 2 is used for generating an infinite distant scene target; the dynamic scene simulator 1 is arranged at the focal plane 9 of the collimator 2 to provide a dynamic imaging scene.
As shown in fig. 2-3, the dynamic scene simulator 1 is of a roller type, and mainly includes a motor 3, a roller 4, an illumination light source 5, a target 6, a base 7, and a translation stage 8.
The roller 4 is formed by processing ferromagnetic metal (such as 45# steel), and the length l of the roller 4 is larger than or equal to the linear view field of the collimator 2. The roller 4 is directly driven by the motor 3, and the rotating direction and the rotating speed of the roller 4 can be changed by controlling the motor 3.
The target 6 adopts a printing mode, and magnetic photographic paper is selected for printing. If the radius of the roller 4 is r and the length is l, the size of the photographic paper is 2 pi r x l. Printing a plurality of character patterns and picture patterns on the magnetic photographic paper; the target 6 is magnetic and can be adsorbed and coated on the circumference of the roller 4.
When a certain target 6 needs to be used, the rotating speed of the roller 4 is adjusted to rotate slowly, and the direction in which the target 6 is put is selected according to the rotating direction of the roller 4. If the roller 4 is rotated clockwise, as shown in fig. 2-3, the target 6 is dropped from top to bottom. When the picture needs to be replaced, the edge of the target 6 is held, the roller 4 is slowly rotated, the target 6 is taken out, and a new picture is put in.
The dynamic scenery simulator 1 adopts a lateral illumination mode, an illumination light source 5 is arranged in a focal area 10 of a collimator, a light source central line 11 is aligned with the center of a focal plane 9, and the installation angle is beta. As shown in fig. 2-3, β is an included angle between the light source center line 11 and the roller center line 12, and the reference value range of β is 20 ° to 90 °. The lighting source 5 can be an LED lamp strip or a halogen tungsten lamp.
When the device is used for generating an infinite target, the position of the roller 4 needs to meet the following requirements:
the central line 11 of the roller is superposed with the optical axis of the collimator;
the roller 4 is tangent to the focal plane 9 of the collimator;
and the rest parts of the roller 4 are positioned in the focal back area 13 of the collimator except the tangent position.
As shown in FIG. 4, if the focal depth of the collimator is 2a and the radius of the roller 4 is r, the target range observed by the camera along the circumferential direction at any time is
The embodiment also provides a method for dynamic scene simulation for space camera test, which is based on the device shown in fig. 5.
Turning on the illumination light source 5, turning on the motor 3, driving the roller 4 and the target 6 coated above to rotate at a certain speed, and providing an infinite dynamic scene target for the camera 14 to be tested;
and the translation table 8 is adjusted to enable all the mechanisms above to move back and forth along the optical axis direction, so that dynamic scene targets with different distances can be provided for the camera 14 to be detected.
The dynamic scenery simulation device 1 is integrally moved out of the focal plane 9, a reticle is placed on the focal plane 9, and a light source is placed behind the focal plane 13, so that the dynamic scenery simulation device can be used as a static scenery simulation system.
Fig. 6 shows a more specific embodiment of the present invention when the off-axis RC collimator 15 is used, that is, the dynamic scene simulation device 1 is placed at the focal plane 9 of the off-axis RC collimator 15 to form a set of dynamic scene simulation system.
The size of the roller 4 is selected according to the size of the field of view of the off-axis RC collimator 15: the diameter is 100mm, and the length is 100 mm; the roller 4 is machined by 45# steel.
The motor 3 drives the roller 4 to rotate, the rotating speed can be set to be 0-100mm/s, and the rotating direction can be adjusted bidirectionally.
According to the requirement of the invention, the roller 4 is placed, and if the focal depth of the collimator is 1mm, the target range observed by the camera is 14mm along the circumferential direction at any moment.
The dynamic scene simulation device 1 adopts lateral illumination, and the illumination light source 5 adopts a halogen tungsten lamp with an installation angle of 60 degrees.
Turning on the illumination light source 5, turning on the motor 3, driving the roller 4 and the target 6 coated above to rotate at a certain speed, and generating an infinite dynamic scene target;
the translation table 8 drives the upper mechanism to move back and forth along the optical axis direction, and dynamic scene targets with different distances can be provided for the camera.
The dynamic scenery simulation device 1 is integrally moved out of the focal plane 9, a reticle is placed on the focal plane 9, and a light source is placed in the area 13 behind the focal plane, so that the dynamic scenery simulation device can be used as a static scenery simulation system.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the present invention. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A dynamic scene simulation system for space camera test is characterized by comprising a dynamic scene simulation device (1) and a collimator (2) for generating an infinite scene target, wherein the dynamic scene simulation device (1) is placed at a focal plane (9) of the collimator (2) and used for providing a dynamic imaging scene; the dynamic scenery simulation device (1) comprises a driving mechanism, a roller (4), an illuminating light source (5), a target (6) and a base (7), wherein the length l of the roller (4) is larger than or equal to the linear view field of a collimator (2), the roller (4) can change the rotating direction and the rotating speed under the control of the driving mechanism, the illuminating light source (5) is installed in a region (10) in front of the collimator focus, the target (6) is coated on the roller (4), and the driving mechanism, the roller (4) and the illuminating light source (5) are all installed on the base (7).
2. The dynamic scene simulation system for the space camera test according to claim 1, wherein the dynamic scene simulation device (1) further comprises a translation stage (8), the base (7) is fixed on the translation stage (8), and the translation stage (8) can drive the mechanism above the translation stage to move back and forth along the optical axis direction.
3. The dynamic scene simulation system for the space camera test according to claim 1, wherein the roller (4) is formed by processing ferromagnetic metal, and the target (6) is printed by using a printing mode and magnetic photographic paper.
4. The dynamic scene simulation system for space camera test according to claim 1, wherein the dynamic scene simulation device (1) adopts a side illumination mode, the central line (11) of the light source is aligned with the center of the focal plane (9), and the installation angle is beta.
5. The dynamic scene simulation system for the space camera test according to claim 4, wherein β is an included angle between a light source center line (11) and a roller center line (12), and a value range of β is 20 ° to 90 °.
6. The dynamic scene simulation system for the space camera test as claimed in claim 1, wherein the illumination light source (5) is selected from an LED lamp strip or a halogen tungsten lamp.
7. A dynamic scene simulation system for space camera testing according to claim 1, characterized in that for generating an infinite target, the position of the wheel (4) satisfies:
1) the central line (11) of the roller is superposed with the optical axis of the collimator;
2) the roller (4) is tangent to the focal plane (9) of the collimator;
3) except for the tangent position, the rest part of the roller (4) is positioned in the focal area (13) of the collimator.
8. The dynamic scenery simulation system for space camera test according to claim 1, characterized in that the dynamic scenery simulation device (1) is arranged at one side of the collimator (2), the other side of the collimator (2) is provided with the camera (14) to be tested, if the focal depth of the collimator (2) is 2a and the radius of the roller (4) is r, the range of the target observed by the camera (14) to be tested is within the range of 2a and r along the circumferential direction at any time
9. A dynamic scene simulation method according to the dynamic scene simulation system of any one of claims 1 to 8, comprising:
turning on an illumination light source (5), driving a roller (4) and a target (6) coated above to rotate at a preset speed so as to provide an infinite dynamic scene target; the dynamic scenery simulation device (1) is integrally moved out of a focal plane (9), a reticle is placed on the focal plane (9), and a light source (5) is placed in a focal back area of the collimator tube (2) and used as a static scenery simulation system.
Printing a plurality of character patterns and picture patterns on the magnetic photographic paper; when a certain target (6) needs to be used, adjusting the rotating speed of the roller (4), and selecting the placing direction of the target (6) according to the rotating direction of the roller (4); when the picture needs to be replaced, the edge of the target (6) is held, the roller (4) is rotated, the target (6) is taken out, and then a new picture is put in.
10. A dynamic scene simulation method according to claim 9, characterised in that the translation stage (8) is adjusted to move all the mechanisms above back and forth in the direction of the optical axis to provide dynamic scene objects of different distances for the camera (14) under test.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110602752.5A CN113281014A (en) | 2021-05-31 | 2021-05-31 | Dynamic scene simulation system and method for space camera test |
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| CN202110602752.5A CN113281014A (en) | 2021-05-31 | 2021-05-31 | Dynamic scene simulation system and method for space camera test |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202092660U (en) * | 2011-06-21 | 2011-12-28 | 北京凌云光视数字图像技术有限公司 | Scenery simulator applicable to TDI (Transport Driver Interface) camera |
| CN102853998A (en) * | 2012-08-29 | 2013-01-02 | 中国科学院长春光学精密机械与物理研究所 | Variable pitch dynamic goal simulating system and using method thereof |
| CN108896279A (en) * | 2018-06-07 | 2018-11-27 | 北京空间机电研究所 | A kind of autonomous matching test system of super quick dynamic middle imaging space camera integration time |
| CN110261072A (en) * | 2019-07-12 | 2019-09-20 | 北京空间机电研究所 | The dynamic target being imaged during a kind of analog is dynamic |
| CN210337164U (en) * | 2019-05-23 | 2020-04-17 | 温州市享通塑磁科技有限公司 | Magnetic photographic paper |
-
2021
- 2021-05-31 CN CN202110602752.5A patent/CN113281014A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202092660U (en) * | 2011-06-21 | 2011-12-28 | 北京凌云光视数字图像技术有限公司 | Scenery simulator applicable to TDI (Transport Driver Interface) camera |
| CN102853998A (en) * | 2012-08-29 | 2013-01-02 | 中国科学院长春光学精密机械与物理研究所 | Variable pitch dynamic goal simulating system and using method thereof |
| CN108896279A (en) * | 2018-06-07 | 2018-11-27 | 北京空间机电研究所 | A kind of autonomous matching test system of super quick dynamic middle imaging space camera integration time |
| CN210337164U (en) * | 2019-05-23 | 2020-04-17 | 温州市享通塑磁科技有限公司 | Magnetic photographic paper |
| CN110261072A (en) * | 2019-07-12 | 2019-09-20 | 北京空间机电研究所 | The dynamic target being imaged during a kind of analog is dynamic |
Non-Patent Citations (1)
| Title |
|---|
| 艾广燚: "基于DSP的航空相机地面景物模拟系统的研究", 《中国优秀硕士学位论文工程科技Ⅱ辑》, no. 06, 15 June 2011 (2011-06-15), pages 15 - 18 * |
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