A dual-band scene simulator optical axis parallelism calibration device and method

Abstract

The present invention provides a dual-band scene simulator optical axis parallelism calibration device, comprising a calibrator, a simulator to be tested, an optical air-floating platform, a computer and a large-caliber total reflection collimator, the calibrator comprising a spectroscope, a visible light CCD, and a thermal imager, the collimator comprising a primary mirror, a secondary mirror and a light tube channel; the collimator is mounted on the optical air-floating platform and fixed horizontally, the simulator to be tested is mounted on a supporting tooling and the supporting tooling is fixed horizontally on the optical air-floating platform, two beams of parallel light emitted by the simulator to be tested can be emitted into the collimator along the emission port; the spectroscope can divide the scene light emitted through the light tube channel into visible light and infrared light, the visible light can be focused on the visible light CCD through the spectroscope, and the infrared light can be focused on the thermal imager through the spectroscope reflection; the computer is electrically connected to the simulator to be tested, the visible light CCD, and the thermal imager. The present invention has a simple structure, can adapt to scene simulators with a variety of optical axis spacings and position arrangements, and can achieve pixel-level calibration.

Description

Technical Field

[0001] The invention relates to the field of optical technology, and in particular to a device and method for calibrating the optical axis parallelism of a dual-band scene simulator. Background Art

[0002] The scene simulator is a key device for optoelectronic imaging detection devices and optoelectronic monitoring equipment. The simulation accuracy of dual-band dual-channel depends on the parallelism of the two optical axes of the simulator, so the parallelism calibration equipment of the simulator is particularly important. However, the traditional scene simulator is complex in structure and difficult to operate. In addition, the scene simulator is not suitable for a variety of optical axis spacing and position arrangements, and pixel-level calibration cannot be achieved. Therefore, there is an urgent need for a scene simulator that can achieve a variety of optical axis spacing and position arrangements.

[0003] Currently, no effective solution has been proposed for the problems in the related technologies. Summary of the invention

[0004] The purpose of the present invention is to provide a dual-band scene simulator optical axis parallelism calibration device and method to solve the problems raised in the above background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A dual-band scene simulator optical axis parallelism calibration device, comprising a calibrator, a simulator to be tested, an optical air-floating platform (isolated from external interference), a computer and a large-caliber total reflection collimator, wherein the calibrator comprises a spectroscope, a visible light CCD, and a thermal imager, and the large-caliber total reflection collimator comprises a primary mirror, a secondary mirror and a light pipe channel;

[0007] The large-aperture total reflection collimator is installed on the optical air-floating platform and fixed horizontally, the simulator under test is installed on the supporting fixture and the supporting fixture is fixed horizontally on the optical air-floating platform, and the two beams of parallel light emitted by the simulator under test can be emitted into the large-aperture total reflection collimator along the emission port;

[0008] The beam splitter can separate the scene light emitted through the light pipe channel into visible light and infrared light. The visible light can be focused on the visible light CCD through the beam splitter, and the infrared light is reflected by the beam splitter and focused on the thermal imager.

[0009] The computer is electrically connected to the simulator under test, the visible light CCD and the thermal imager.

[0010] Furthermore, the beam splitter is coated with a metal reflective film for splitting the emitted scene light into visible light and infrared light.

[0011] Furthermore, the beam splitter is fixed to the calibrator and its angle is not adjustable.

[0012] Furthermore, the supporting tooling can adjust the height of the simulator under test.

[0013] Furthermore, a method for calibrating the optical axis parallelism of a dual-band scene simulator comprises the following steps:

[0014] a1: Set the working point of the simulator to be tested to a typical working point. If the distance between the two optical axes is greater than the aperture of the secondary mirror, the two optical axes should be placed on both sides of the secondary mirror; if the distance between the two optical axes is less than the aperture of the secondary mirror, the two optical axes should be placed on one side of the secondary mirror. Under the premise of not blocking the projected image, the two optical axes should be close to the center of the collimator.

[0015] a2: The simulator under test outputs a central cross pattern, and the simulator under test is fine-tuned through the supporting fixture as a whole, so that the cross center of the central cross image acquired by the visible light CCD is located at the center of the visible light CCD image;

[0016] a3: Observe the central cross image output by the thermal imager on the computer, and adjust the infrared lens tube or reflector in the simulator under test so that the center of the central cross image output by the thermal imager falls on the center of the thermal imager screen;

[0017] a4: After completing the above steps, repeat the above operations based on the thermal imager output screen until the centers of the two screens completely coincide with the center of the cross pattern output by the tested simulator.

[0018] The working principle of the present invention is as follows: the two-way scene light projected by the simulator under test is converged into the calibrator through a large-caliber total reflection collimator, and the calibrator is provided with a visible light CCD, a thermal imager and a spectroscope. The spectroscope is plated with a metal reflection film, which is used to separate the emitted scene light into visible light and infrared light, wherein the infrared light is reflected and focused on the thermal imager, and the visible light is focused on the visible light CCD through the spectroscope. The center positions of the visible light CCD and the thermal imager are accurately calibrated during installation to ensure the measurement accuracy. The large-caliber total reflection collimator is installed on the optical air-floating platform and fixed horizontally. The simulator under test is installed on a supporting fixture and the supporting fixture is fixed horizontally on the optical air-floating platform. The supporting fixture can fine-tune the height of the simulator under test. The computer is electrically connected to the simulator under test, the visible light CCD, and the thermal imager.

[0019] The above device is used to observe the cross target scene output by the tested simulator. If the central pixels of the cross targets obtained by the two channels are not on the central pixels of the visible light CCD and the thermal imager, then take one channel as a reference and adjust the relative position of the calibrator and the tested simulator so that any optical axis falls on the central pixel of the field of view of the corresponding channel. Fix the entire device and adjust the other optical axis until the centers finally coincide. At this point, the system achieves the pixel-level positioning coincidence goal and realizes the calibration of the optical axis parallelism of the dual-band scene simulator.

[0020] Compared with the prior art, the present invention has the following beneficial effects: 1. The device has a novel structure and strong practicality; 2. The device is used to realize the calibration of the optical axis parallelism of the dual-band scene simulator, which is simple to operate and can quickly realize the calibration of the optical axis parallelism; 3. The device can adapt to scene simulators with a variety of optical axis spacing and position arrangements, and can realize pixel-level calibration. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 It is a structural schematic diagram of an optical axis parallelism calibration device of a dual-band scene simulator of the present invention.

[0023] In the figure: 1. Calibrator, 2. Optical air-floating platform, 3. Computer, 4. Spectrometer, 5. Visible light CCD, 6. Thermal imager, 7. Large-aperture total reflection collimator, 8. Primary mirror, 9. Secondary mirror, 10. Light tube channel, 11. Support tooling, 12. Launch port, 13. Test simulator. DETAILED DESCRIPTION

[0024] Below, the invention is further described in conjunction with the accompanying drawings and specific embodiments:

[0025] like Figure 1 As shown, a dual-band scene simulator optical axis parallelism calibration device includes a calibrator 1, a simulator to be tested 13, an optical air floating platform 2, a computer 3 and a large-caliber total reflection collimator 7, wherein the calibrator 1 includes a beam splitter 4, a visible light CCD 5, and a thermal imager 6, and the large-caliber total reflection collimator 7 includes a primary mirror 8, a secondary mirror 9 and a light pipe channel 10;

[0026] The large-aperture total reflection collimator 7 is mounted on the optical air-floating platform 2 and fixed horizontally, the simulator 1 under test is mounted on the supporting fixture 11 and the supporting fixture 11 is fixed horizontally on the optical air-floating platform 1, and the two beams of parallel light emitted by the simulator 13 under test can be emitted into the large-aperture total reflection collimator 7 along the emission port 12;

[0027] The beam splitter 4 can split the scene light emitted through the light pipe channel 10 into visible light and infrared light. The visible light can be focused on the visible light CCD 5 through the beam splitter 4, and the infrared light is reflected by the beam splitter 4 and focused on the thermal imager 6.

[0028] The computer 3 is electrically connected to the simulator 13 under test, the visible light CCD 5 , and the thermal imager 6 .

[0029] According to the above content, the beam splitter 4 is coated with a metal reflective film to separate the emitted scene light into visible light and infrared light.

[0030] According to the above content, the beam splitter 4 is fixed to the calibrator 1 and the angle is not adjustable.

[0031] According to the above content, the supporting tool 11 can adjust the height of the simulator 1 under test.

[0032] The optical axis parallelism calibration device of the dual-band scene simulator consists of a calibrator 1, a simulator under test 13, an optical air-floating platform 2, a computer 3 and a large-aperture total reflection collimator 7, and is used to test and calibrate the optical axis parallelism of the output light path of the dual-band scene simulator.

[0033] In this device, two paths of scene light projected by the simulator 13 under test are converged into the calibrator 1 through the large-aperture total reflection collimator 7. The calibrator 1 is provided with a visible light CCD 5, a thermal imager 6 and a spectroscope 4. The spectroscope 4 is plated with a metal reflective film, which is used to separate the emitted scene light into visible light and infrared light, wherein the infrared light is reflected and focused on the thermal imager 6, and the visible light is focused on the visible light CCD 5 through the spectroscope 4. The center positions of the visible light CCD 5 and the thermal imager 6 are accurately calibrated during installation to ensure the measurement accuracy. The large-aperture total reflection collimator is installed on the optical air-floating platform and fixed horizontally. The simulator 13 under test is installed on the supporting fixture 11 and the supporting fixture 11 is fixed horizontally on the optical air-floating platform. The supporting fixture 11 can fine-tune the height of the simulator 13 under test. The computer 3 is electrically connected to the simulator 13 under test, the visible light CCD 5 and the thermal imager 6.

[0034] According to the above content, a method for calibrating the optical axis parallelism of a dual-band scene simulator includes the following steps:

[0035] a1: Set the working point of the simulator 13 to a typical working point. If the distance between the two optical axes is greater than the aperture of the secondary mirror 9, the two optical axes should be placed on both sides of the secondary mirror 9; if the distance between the two optical axes is less than the aperture of the secondary mirror 9, the two optical axes should be placed on one side of the secondary mirror 9. Under the premise of not blocking the projected image, the two optical axes should be close to the center of the parallel light tube;

[0036] a2: the simulator 13 under test outputs a central cross pattern, and the simulator 13 under test is fine-tuned as a whole by supporting the fixture 11, so that the cross center of the central cross image acquired by the visible light CCD5 is located at the center of the visible light CCD5 image;

[0037] a3: Observe the central cross image output by the thermal imager 6 on the computer 3, and adjust the infrared lens barrel or reflector in the simulator 13 under test so that the center of the central cross image output by the thermal imager 6 falls on the center of the screen of the thermal imager 6;

[0038] a4: After completing the above steps, the above operations are repeated based on the image output by the thermal imager 6 until the centers of the two images completely coincide with the center of the cross pattern output by the simulator 13 under test.

[0039] The above device is used to observe the cross target scene output by the tested simulator. If the central pixels of the cross targets obtained by the two channels are not on the central pixels of the visible light CCD and the thermal imager, then take one channel as a reference and adjust the relative position of the calibrator and the tested simulator so that any optical axis falls on the central pixel of the field of view of the corresponding channel. Fix the entire device and adjust the other optical axis until the centers finally coincide. At this point, the system achieves the pixel-level positioning coincidence goal and realizes the calibration of the optical axis parallelism of the dual-band scene simulator.

[0040] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A dual-band scene simulator optical axis parallelism calibration device, characterized in that: It comprises a calibrator (1), a simulator to be tested (13), an optical air-floating platform (2), a computer (3) and a large-aperture total reflection collimator (7); the calibrator (1) comprises a beam splitter (4), a visible light CCD (5) and a thermal imager (6); the large-aperture total reflection collimator (7) comprises a primary mirror (8), a secondary mirror (9) and a light tube channel (10); The large-aperture total reflection collimator (7) is mounted on the optical air-floating platform (2) and fixed horizontally, the simulator (13) under test is mounted on the supporting fixture (11) and the supporting fixture (11) is fixed horizontally on the optical air-floating platform (2), and two beams of parallel light emitted by the simulator (13) under test can be emitted into the large-aperture total reflection collimator (7) along the emission port (12); The beam splitter (4) can split the scene light emitted through the light pipe channel (10) into visible light and infrared light; the visible light can be focused on the visible light CCD (5) through the beam splitter (4); and the infrared light is reflected by the beam splitter (4) and focused on the thermal imager (6); The computer (3) is electrically connected to the simulator (13) under test, the visible light CCD (5), and the thermal imager (6); The beam splitter (4) is coated with a metal reflective film and is used to separate the emitted scene light into visible light and infrared light; The beam splitter (4) is fixed in the calibrator (1) and its angle cannot be adjusted; The supporting tool (11) can adjust the height of the simulator (13) under test; The calibration method of the above calibration device comprises the following steps: a1: Set the working point of the simulator (13) to a typical working point. If the distance between the two optical axes is greater than the aperture of the secondary mirror (9), the two optical axes should be placed on both sides of the secondary mirror (9); if the distance between the two optical axes is less than the aperture of the secondary mirror (9), the two optical axes should be placed on one side of the secondary mirror (9). Under the premise of not blocking the projected image, the two optical axes should be close to the center of the collimator. a2: the simulator under test (13) outputs a central cross pattern, and the simulator under test (13) is fine-tuned as a whole through the supporting fixture (11) so that the cross center of the central cross image acquired by the visible light CCD (5) is located at the center of the visible light CCD (5) image; a3: Observe the central cross image output by the thermal imager (6) on the computer (3), and adjust the infrared lens tube or reflector in the simulator (13) under test so that the center of the central cross image output by the thermal imager (6) falls on the center of the screen of the thermal imager (6); a4: After completing the above steps, the output image of the thermal imager (6) is used as the reference, and the steps are repeated until the centers of the two images completely coincide with the center of the cross pattern output by the simulator (13) under test.

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