A method for adjusting consistency of optical axis of a double-waveband racemization mechanism with a rotation axis and a mechanism

Abstract

The application discloses a kind of dual-band mechanism optical axis and rotation axis consistency alignment method and mechanism, belong to optical machine alignment field;The mechanism includes the rotation axis system of mechanism of resolving mechanism, four-dimensional adjustable cross center differentiation plate, mid-wave infrared transmission light path and long-wave infrared transmission light path, inner focusing light pipe / infrared collimator, and mid-wave detector and long-wave detector;Inner focusing light pipe is used to adjust mid-wave infrared transmission light path, long-wave infrared transmission light path and rotation axis system coaxial;Mid-wave infrared transmission light path is refracted in inner focusing light pipe by first mirror group;Long-wave infrared transmission light path is refracted in inner focusing light pipe by second mirror group;The infrared collimator is used to adjust mid-wave detector, long-wave detector and rotation axis system coaxial.The application solves the problem that the optical axis of two wavelengths of detector is simultaneously aligned to the alignment difficulty of resolving mechanism rotation axis in existing design.

Description

Technical Field

[0001] This invention belongs to the field of optomechanical assembly and adjustment, specifically relating to a method and mechanism for aligning the optical axis and rotation axis of a dual-band de-rotation mechanism. Background Technology

[0002] Airborne electro-optical detection systems typically employ mid-wave infrared passive tracking detection, offering advantages such as radio silence, operation in complex electromagnetic environments, and high resolution. However, during missions, the images generated by these systems can rotate due to aircraft maneuvers such as roll, affecting the pilot's aiming and controls.

[0003] To eliminate image rotation and ensure the pilot's view remains upright, the infrared detector can be rotated. Infrared detectors are typically mounted in a rotating mechanism, known as a despinning mechanism. Existing despinning mechanisms usually only carry one type of mid-wave infrared detector. Single-band photoelectric detection systems have limited wavelength sensing range, making it difficult to detect threats beyond the mid-wave range. Dual-band photoelectric detection systems can better solve this problem. Despinning mechanisms with single-band detectors are simple, typically containing only a convergent and an infrared detector. Through structural design, their axes are roughly aligned with the despinning axis. During assembly and adjustment, fine-tuning the detector attitude by adjusting the optical tubes is sufficient to achieve axis alignment. However, the despinning mechanism in a dual-band photoelectric detection system is more complex. Besides carrying both mid-wave and long-wave infrared convergent and detectors, it also incorporates a beam splitter and a reflector. Compared to single-detector despinning mechanisms, this mechanism requires coordinated adjustment of the reflector, convergent, and detector components, simultaneously aligning the optical axes of both wavelength detectors with the despinning mechanism's rotation axis. In addition, the transmission path of the beam splitter introduces an optical path difference, which requires the use of special assembly and adjustment tools to compensate for the optical path difference during the assembly and adjustment of the mid-wave optical path, significantly increasing the difficulty of assembly and adjustment.

[0004] This invention provides a dual-band despinning mechanism and an optical axis adjustment method, which can achieve stable adjustment by aligning the mid- and long-wavelength infrared optical paths with the axis of the despinning mechanism. Summary of the Invention

[0005] The technical problem to be solved:

[0006] To overcome the shortcomings of existing technologies, this invention provides a method and mechanism for aligning the optical axis and rotation axis of a dual-band despinning mechanism. First, a visible light internal focusing tube and a cross-shaped dividing plate are used to adjust the mechanical rotation axis of the despinning mechanism. Then, a cross-shaped central reflection fixture is used to adjust the coaxiality of the mid-wave and long-wave converging mirror sides with the rotation axis system of the despinning mechanism. Next, the mid-wave / long-wave detectors are installed into the despinning mechanism, and adjustments are made to ensure that the optical axes of both detectors coincide with the rotation axis system of the despinning mechanism. This invention solves the problem of the difficulty in simultaneously aligning the optical axes of two wavelength detectors to the rotation axis of the despinning mechanism in existing designs.

[0007] The technical solution of this invention is: a method for aligning the optical axis and rotation axis of a dual-band de-rotation mechanism, the specific steps of which are as follows:

[0008] Adjust the optical axis of the internal focusing tube 2 and the rotation axis of the despinning mechanism to be coaxial;

[0009] A mid-wave infrared transmission light path is set on one side of the rotating shaft system, consisting of a second finite light source 17, a second cross-shaped central reflector 9, and a mid-wave converging mirror 8. The mid-wave infrared transmission light path is refracted onto the inner focusing light tube 2 through the first reflector group, and the optical axis of the mid-wave infrared transmission light path is adjusted to coincide with the optical axis of the inner focusing light tube 2.

[0010] On the other side of the rotating shaft system, a long-wave infrared transmission light path is set, consisting of a third finite light source 18, a first cross-shaped central reflective fixture 12, and a long-wave converging mirror 11. The long-wave infrared transmission light path is refracted onto the inner focusing light tube 2 through the second reflector group, and the optical axis of the long-wave infrared transmission light path is adjusted to coincide with the optical axis of the inner focusing light tube 2.

[0011] Remove the internal focusing light tube 2 and place the infrared parallel light tube 20;

[0012] Remove the second cross-shaped central reflector 9 from the mid-wave infrared transmission optical path, assemble the mid-wave detector 14, and adjust the optical axis of the mid-wave detector 14 to coincide with the rotation axis of the de-rotation mechanism 1.

[0013] Remove the first cross-shaped central reflector 12 in the long-wave infrared transmission optical path, assemble the long-wave detector 13, and adjust the optical axis of the long-wave detector 13 to coincide with the rotation axis of the de-rotation mechanism 1; that is, complete the alignment of the optical axis and rotation axis of the dual-band de-rotation mechanism.

[0014] A further technical solution of the present invention is: the method for making the optical axis of the inner focusing tube 2 and the rotation axis of the despinning mechanism 1 coaxial is as follows:

[0015] Place the rotary shaft system directly in front of the inner focusing light tube 2, and assemble the four-dimensional adjustable cross center dividing plate 4 onto the front reference surface of the rotary shaft system structure.

[0016] The rotating axis system is rotated, and the cross lines of the four-dimensional adjustable cross center reticle 4 are illuminated by the first finite light source 16.

[0017] Adjust the focal length of the internal focusing light tube 2, and observe the circle drawing amount of the differentiated image and autocollimation image of the four-dimensional adjustable cross-center differentiator plate 4.

[0018] By adjusting the posture of the four-dimensional adjustable cross center dividing plate 4 until the circle drawing amount reaches the set range, it is considered that the four-dimensional adjustable cross center dividing plate 4 is coaxial with the rotation axis system.

[0019] Adjust the orientation of the inner focusing light tube 2 and make its optical axis consistent with the optical axis of the four-dimensional adjustable cross center dividing plate 4 through real-time observation, so that the optical axis of the inner focusing light tube and the rotation axis of the de-rotation mechanism are coaxial.

[0020] A further technical solution of the present invention is that the circle drawing amount of the differentiated image is set in the range of 3μm-5μm; the circle drawing amount of the autocollimation image is set in the range of 3″-6″.

[0021] A further technical solution of the present invention is: the first reflector group includes a second reflector 6 and a third reflector 7, the second reflector 6 is mounted on a rotation axis system, and the third reflector 7 is located on the optical axis of the mid-wave converging mirror 8;

[0022] The second reflector group includes a beam splitter 5 and a first reflector 10. The beam splitter 5 is mounted on a rotating axis and is located between the second reflector 6 and the visible light inner focusing tube 2. It is used to transmit mid-wave infrared light and reflect long-wave infrared light. The first reflector 10 is located on the optical axis of the long-wave converging mirror 11.

[0023] A further technical solution of the present invention is: the method for aligning the optical axis of the mid-wave infrared transmission optical path with the optical axis of the inner focusing optical tube is as follows:

[0024] Rotate the rotating shaft system and use the second finite light source 17 to illuminate the crosshairs of the second crosshair center reflector 9;

[0025] Adjust the focal length of the visible light focusing tube 2, observe the circle drawing of its collimated image and differentiated image, and adjust the second reflecting mirror 6 and the third reflecting mirror 7 to a 45° angle with the front reference plane of the de-rotation mechanism.

[0026] By rotating the rotation axis system and adjusting the attitude of the wave converging mirror 8, the circle drawing amount of the collimated image and the cross-shaped image is made to meet the range of 3″-6″ and 3μm-5μm respectively. This means that the optical axes of the second reflecting mirror 6, the third reflecting mirror 7, and the mid-wave converging mirror 8 are considered to coincide with the optical axis of the visible light internal focusing tube 2, that is, to be coaxial with the rotation axis system.

[0027] A further technical solution of the present invention is: the method for aligning the optical axis of the long-wave infrared transmission optical path with the optical axis of the inner focusing optical tube is as follows:

[0028] The rotating shaft system is used to illuminate the crosshairs of the first crosshair center reflector 12 with the third finite light source 18.

[0029] Assemble the beam splitter 5, adjust the focal length of the visible light focusing tube 2, observe the circle drawing of its collimated image and the divided image, and adjust the first reflecting mirror 10 to a 45° angle with the front reference plane of the de-rotation mechanism.

[0030] Rotate the rotation axis system and adjust the attitude of the long-wave converging mirror 11 so that the circle drawing amount of the collimated image and the cross-shaped image meets the range of 3″-6″ and 3μm-5μm respectively. It is considered that the optical axis of the beam splitter, the first reflecting mirror 10, and the side of the long-wave converging mirror 11 coincides with the optical axis of the visible light internal focusing tube 2, that is, it is coaxial with the rotation axis system.

[0031] A further technical solution of the present invention is: the method for aligning the optical axis of the medium-wave detector 14 with the rotation axis of the despinning mechanism 1 is as follows:

[0032] The infrared collimator is placed on the optical platform 19 and located directly in front of the rotation axis of the de-rotation mechanism 1; the rotation axis with the mid-wave infrared transmission optical path and the long-wave infrared transmission optical path is installed on the two-dimensional adjustment table 15.

[0033] The infrared collimator 20 point target is observed by the mid-wave detector 14. The rotation axis of the de-rotation mechanism 1 is rotated. The attitude of the two-dimensional adjustment stage 15 is adjusted so that the circle drawing amount of the infrared collimator 20 point target meets the set range. The attitude of the mid-wave detector 14 is adjusted so that the point target is at the center of the target surface of the mid-wave detector 14.

[0034] A further technical solution of the present invention is: the method for aligning the optical axis of the long-wavelength detector 13 with the rotation axis of the despinning mechanism 1 is as follows:

[0035] The infrared collimator 20-point target is observed by the long-wave detector 13. The circular amount of the infrared collimator 20-point target is made to meet the set range by adjusting the two-dimensional adjustment stage 15. The attitude of the long-wave detector 13 is adjusted so that the point target is in the center of the target surface of the long-wave detector.

[0036] A dual-band despinning mechanism optical axis and rotation axis alignment system includes a rotation axis system of the despinning mechanism, a four-dimensional adjustable cross-shaped center dividing plate 4 installed on the rotation axis system, a mid-wave infrared transmission optical path and a long-wave infrared transmission optical path located on both sides of the rotation axis system, an inner focusing optical tube / infrared parallel optical tube located in front of the rotation axis system, and a mid-wave detector and a long-wave detector constituting the despinning mechanism.

[0037] The internal focusing light tube is used to adjust the mid-wave infrared transmission light path, the long-wave infrared transmission light path and the rotation axis system to be coaxial.

[0038] The mid-wave infrared transmission optical path consists of a second finite light source 17, a second cross-shaped central reflector 9, and a mid-wave converging mirror 8, which refracts the mid-wave infrared transmission optical path onto the inner focusing light tube through the first reflector group.

[0039] The long-wave infrared transmission light path consists of a third finite light source 18, a first cross-shaped central reflector 12, and a long-wave converging mirror 11, and the long-wave infrared transmission light path is refracted into the inner focusing light tube by the second reflector group.

[0040] The infrared collimator is used to adjust the coaxiality of the medium-wave detector, the long-wave detector, and the rotary axis system.

[0041] A further technical solution of the present invention is that the surfaces of the four-dimensional adjustable cross center differentiation plate 4, the second cross center reflection fixture 9, and the first cross center reflection fixture 12 are all coated with a metal reflective film, and a cross is engraved at the center.

[0042] Beneficial effects

[0043] The beneficial effects of this invention are as follows: the alignment of the optical axis and rotation axis of the dual-band despinning mechanism involved in this invention can achieve stable assembly and adjustment. By visually observing the alignment of the optical axis and rotation axis of the dual-band despinning mechanism using a visible light focusing tube and an infrared collimator, the two optical paths are separated and adjusted individually. The two optical paths do not affect each other, while ensuring that both are aligned with the rotation axis of the despinning mechanism. This assembly and adjustment method is simple, practical, and highly accurate, and can be widely applied to the alignment of the optical axis and rotation axis of dual-band and multi-band infrared despinning mechanisms.

[0044] In this invention, during the assembly and adjustment of the dual-band optical path, the mid-wave infrared optical path needs to be assembled and adjusted first, followed by the long-wave infrared optical path. This is because the beam splitter 5 transmits mid-wave light but not visible light. The limited light sources used in the assembly and adjustment process are all visible light, and the internal focusing tube 2 can only emit and observe visible light. Therefore, the mid-wave optical path needs to be assembled and adjusted first, followed by the beam splitter 5 and then the long-wave optical path. Since the beam splitter 5 has a certain thickness, it will cause an optical path difference in the optical path. When assembling the mid-wave optical path with visible light, the beam splitter 5 is not yet assembled and is not affected by this factor. However, when using the mid-wave detector 14 to observe the infrared collimator 20 point targets, the beam splitter 5 is in the assembled state, which introduces an optical path difference, leading to inconsistencies in the assembly and adjustment of the same optical path. Therefore, during the assembly and adjustment of the mid-wave side optical path, a four-dimensional adjustable crosshair center reticle tooling 4 needs to be used to adjust the optical axis of the visible light internal focusing tube 2 and the rotation axis system of the de-rotation mechanism to be coaxial, compensating for the resulting optical path difference. Attached Figure Description

[0045] Figure 1 This is a schematic diagram of a dual-band despinning mechanism and an optical path through-axis.

[0046] Figure 2 This is a schematic diagram of the alignment and adjustment of the detector target center and the rotation axis of the dual-band despinning mechanism;

[0047] Explanation of reference numerals in the attached drawings: 1. Despinning mechanism; 2. Internal focusing light tube; 3. Four-dimensional adjustment stage; 4. Four-dimensional adjustable cross-shaped central splitter plate; 5. Beam splitter; 6. Second reflecting mirror; 7. Third reflecting mirror; 8. Mid-wave converging mirror; 9. Second cross-shaped central reflecting fixture; 10. First reflecting mirror; 11. Long-wave converging mirror; 12. First cross-shaped central reflecting fixture; 13. Long-wave detector; 14. Mid-wave detector; 15. Two-dimensional adjustment stage; 16. First finite light source; 17. Second finite light source; 18. Third finite light source; 19. Optical platform; 20. Infrared collimator. Detailed Implementation

[0048] The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the invention, and should not be construed as limiting the invention.

[0049] Addressing the difficulty of simultaneously aligning the optical axes of two wavelength detectors to the rotation axis of the despinning mechanism in existing technologies, this invention provides a method and mechanism for aligning the optical axis of a dual-band despinning mechanism with its rotation axis. The mechanism includes a rotation axis system comprising the despinning mechanism, a four-dimensional adjustable cross-shaped center dividing plate 4 mounted on the rotation axis system, mid-wave infrared transmission optical paths and long-wave infrared transmission optical paths located on either side of the rotation axis system, an inner focusing tube / infrared parallel tube located directly in front of the rotation axis system, and mid-wave and long-wave detectors constituting the despinning mechanism. The inner focusing tube is used for adjustment... The mid-wave infrared transmission light path and the long-wave infrared transmission light path are coaxial with the rotation axis system. The mid-wave infrared transmission light path consists of a second finite light source 17, a second cross-shaped central reflector 9, and a mid-wave converging mirror 8, which refracts the mid-wave infrared transmission light path onto the inner focusing light tube 2 through a first reflector group. The long-wave infrared transmission light path consists of a third finite light source 18, a first cross-shaped central reflector 12, and a long-wave converging mirror 11, which refracts the long-wave infrared transmission light path onto the inner focusing light tube through a second reflector group. The infrared collimator is used to adjust the mid-wave detector, the long-wave detector, and the rotation axis system to be coaxial.

[0050] Specifically, the surfaces of the four-dimensional adjustable cross center differentiation plate 4, the second cross center reflection fixture 9, and the first cross center reflection fixture 12 are all coated with a metal reflective film, and a cross is engraved at the center.

[0051] Specifically, the internal focusing tube 2 emits parallel visible light to observe the optical axis of the four-dimensional adjustable crosshair reticle, long-wave convergence, and medium-wave convergence.

[0052] Specifically, the infrared collimator 20 provides an infinity far-infrared point target, and the light emitted by it is focused and projected onto the detector target surface.

[0053] Specifically, long-wave detector 13 and mid-wave detector 14 observe infrared point targets respectively.

[0054] Specifically, a limited light source illuminates the central crosshairs of the four-dimensional reticle and the reflective fixture.

[0055] Specifically, rotating the rotation axis of the de-rotation mechanism by 180° will not cause any shift in the target position of the observation point.

[0056] Specifically, the two-dimensional adjustment table 15 can adjust the azimuth and pitch angles of the de-rotation mechanism.

[0057] The above method will be further explained below with reference to the attached diagram:

[0058] This embodiment presents a method for aligning the optical axis and rotation axis of a dual-band despinning mechanism. It utilizes an internal focusing optical tube to provide parallel light and observe a four-dimensional adjustable crosshair reticle, an infrared parallel optical tube to provide an infinitely distant target, and a multi-dimensional adjustment stage for alignment. The specific implementation is as follows:

[0059] Step 1: As Figure 1 As shown, the rotation axis of the derotation mechanism 1 is placed directly in front of the inner focusing light tube 2, and the four-dimensional adjustable crosshair center divider plate 4 is assembled on the front reference surface of the rotation axis structure. Rotate the rotation axis system, and use the first finite light source 16 to illuminate the crosshairs of the four-dimensional adjustable crosshair center divider plate 4. Adjust the focal length of the inner focusing light tube 2 to observe the circle drawing amount of the divided image and autocollimated image of the four-dimensional adjustable crosshair center divider plate 4. By adjusting the attitude of the four-dimensional adjustable crosshair center divider plate 4, until the circle drawing amount reaches the set range, it is considered that the optical axis is consistent with the mechanical rotation axis of the derotation mechanism 1 axis system. Adjust the attitude of the inner focusing light tube 2 to make its optical axis consistent with the optical axis of the four-dimensional adjustable crosshair center divider plate 4.

[0060] Specifically, the circle size setting range for the differentiated image is 3μm-5μm; the circle size setting range for the autocollimated image is 3″-6″.

[0061] Step 2: Remove the four-dimensional adjustable cross-shaped central divergence plate 4. Assemble the second reflecting mirror 6, the third reflecting mirror 7, the mid-wave converging mirror 8, and the second cross-shaped central reflecting fixture 9 within the housing of the despinning mechanism 1. The second cross-shaped central reflecting fixture 9 is mounted on the mid-wave converging mirror 8. Rotate the housing of the despinning mechanism 1 and illuminate the crosshairs of the second cross-shaped central reflecting fixture 9 with the second finite light source 17. Adjust the focal length of the internal focusing tube 2 and observe the circularity of the collimated and diverged images. Adjust the second reflecting mirror 6 and the third reflecting mirror 7 to form a 45° angle with the front reference plane of the despinning mechanism. Rotate the rotation axis system and adjust the attitude of the mid-wave converging mirror 8 so that the circularity of the collimated image and the diverged cross-shaped image are between 3″-6″ and 3μm-5μm, respectively. This is considered as the optical axes of the second reflecting mirror 6, the third reflecting mirror 7, and the mid-wave converging mirror 8 coinciding with the optical axis of the visible light internal focusing tube 2, i.e., coaxial with the rotation axis system.

[0062] It should be noted that during the assembly and adjustment of the dual-band optical path, the mid-wave infrared optical path must be assembled and adjusted first, followed by the long-wave infrared optical path. This is because the beam splitter 5 transmits mid-wave light and does not transmit visible light. The limited light sources used in the assembly and adjustment process are all visible light, and the internal focusing tube 2 can only emit and observe visible light. Therefore, the mid-wave optical path must be assembled and adjusted first, followed by the beam splitter 5, and then the long-wave optical path. Because the beam splitter 5 has a certain thickness, it will introduce an optical path difference. When assembling the mid-wave optical path with visible light, the beam splitter 5 is not yet assembled and is not affected by this factor. However, when using the mid-wave detector 14 to observe the infrared collimator 20 point targets, the beam splitter 5 is in the assembled state, which introduces an optical path difference, leading to inconsistencies in the assembly and adjustment of the same optical path. Therefore, during the assembly and adjustment of the mid-wave side optical path, a four-dimensional adjustable crosshair center reticle fixture 4 needs to be used to adjust the optical axis of the visible light internal focusing tube 2 and the rotation axis of the de-rotation mechanism to be coaxial, compensating for the resulting optical path difference.

[0063] Step 3: Assemble the beam splitter 5, the first reflecting mirror 10, the long-wave converging mirror 11, and the first crosshair center reflecting fixture 12 inside the housing of the despinning mechanism 1. The first crosshair center reflecting fixture 12 is mounted on the long-wave converging mirror 11. Rotate the housing of the despinning mechanism 1 and illuminate the crosshairs of the first crosshair center reflecting fixture 12 with the third finite light source 18. Adjust the focal length of the inner focusing tube 2 to observe the circle drawing of the collimated image and the differentiated image. Adjust the first reflecting mirror 10 to form a 45° angle with the front reference plane of the despinning mechanism. Rotate the rotation axis system to adjust the attitude of the long-wave converging mirror 11 so that the circle drawing of the collimated image and the crosshair differentiated image are 3″-6″ and 3μm-5μm, respectively. At this time, the optical axes of the mid-wave converging mirror 8 side and the long-wave converging mirror 11 side are both coincident with the optical axis of the inner focusing tube 2, that is, coaxial with the rotation axis system of the despinning mechanism 1.

[0064] Step 4: As Figure 2As shown, the housing of the despinning mechanism 1 is placed directly in front of the infrared collimator 20, and the housing of the despinning mechanism 1 is installed on the two-dimensional adjustment stage 15. The infrared collimator 20 is placed on the optical platform 19.

[0065] Step 5: Remove the second cross-shaped center reflector 9 and assemble the mid-wave detector 14 into the housing of the de-rotation mechanism 1. Observe the infrared collimator 20 point target through the mid-wave detector 14. Rotate the axis of the de-rotation mechanism 1 and adjust the attitude of the two-dimensional adjustment stage 15 to minimize the circle drawn by the infrared collimator 20 point target. Adjust the attitude of the mid-wave detector 14 so that the point target is at the center of the target surface of the mid-wave detector 14.

[0066] Step 6: Remove the first crosshair center reflector 12 and assemble the long-wave detector 13 into the despinning mechanism 1. Observe the infrared collimator 20-point target through the long-wave detector 13. Adjust the two-dimensional adjustment stage 15 to minimize the circular range of the infrared collimator 20-point target. Adjust the attitude of the long-wave detector 13 so that the point target is at the center of the long-wave detector target surface. At this time, the optical axes of both the mid-wave detector 14 and the long-wave detector 13 coincide with the rotation axis of the despinning mechanism 1.

[0067] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention without departing from the principles and spirit of the present invention.

Claims

1. A method for aligning the optical axis and rotation axis of a dual-band de-rotation mechanism, characterized in that... The specific steps are as follows: Adjust the optical axis of the internal focusing tube (2) and the rotation axis of the despinning mechanism to be coaxial; A mid-wave infrared transmission light path is set on one side of the rotating shaft system, consisting of a second finite light source (17), a second cross-shaped central reflection fixture (9), and a mid-wave converging mirror (8). The mid-wave infrared transmission light path is reflected onto the inner focusing light tube (2) through the first reflecting mirror group. The optical axis of the mid-wave infrared transmission light path is adjusted to coincide with the optical axis of the inner focusing light tube (2). On the other side of the rotating axis system, a long-wave infrared transmission light path is set up, consisting of a third finite light source (18), a first cross-shaped central reflector (12), and a long-wave converging mirror (11). The long-wave infrared transmission light path is refracted onto the inner focusing light tube (2) through the second reflector group. The optical axis of the long-wave infrared transmission light path is adjusted to coincide with the optical axis of the inner focusing light tube (2). Remove the internal focusing light tube (2) and place the infrared parallel light tube (20). Remove the second cross-shaped central reflection fixture (9) in the mid-wave infrared transmission optical path, assemble the mid-wave detector (14), and adjust the optical axis of the mid-wave detector (14) to coincide with the rotation axis of the de-rotation mechanism (1). Remove the first cross-shaped central reflector (12) in the long-wave infrared transmission optical path, assemble the long-wave detector (13), and adjust the optical axis of the long-wave detector (13) to coincide with the rotation axis of the de-rotation mechanism (1); that is, complete the alignment of the optical axis and rotation axis of the dual-band de-rotation mechanism.

2. The method for aligning the optical axis and rotation axis of a dual-band de-rotation mechanism according to claim 1, characterized in that: The method for making the optical axis of the adjusting inner focusing tube (2) and the rotation axis of the despinning mechanism (1) coaxial is as follows: Place the rotary shaft system directly in front of the inner focusing light tube (2), and assemble the four-dimensional adjustable cross center dividing plate (4) on the front reference surface of the rotary shaft system structure; Rotate the rotation axis system and simultaneously use the first finite light source (16) to illuminate the cross lines of the four-dimensional adjustable cross center differentiation plate (4); Adjust the focal length of the internal focusing tube (2) and observe the circle drawing of the differentiated image and autocollimation image of the four-dimensional adjustable cross-center differentiation plate (4); By adjusting the posture of the four-dimensional adjustable cross center differentiation plate (4) until the circle drawing amount reaches the set range, it is considered that the four-dimensional adjustable cross center differentiation plate (4) is coaxial with the rotation axis system. Adjust the orientation of the inner focusing tube (2) and make its optical axis consistent with the optical axis of the four-dimensional adjustable cross center dividing plate (4) through real-time observation, so that the optical axis of the inner focusing tube and the rotation axis of the de-rotation mechanism are coaxial.

3. The method for aligning the optical axis and rotation axis of a dual-band de-rotation mechanism according to claim 2, characterized in that: The circle size setting range for the differentiated image is 3μm-5μm; the circle size setting range for the autocollimated image is 3″-6″.

4. The method for aligning the optical axis and rotation axis of a dual-band de-rotation mechanism according to claim 3, characterized in that: The first reflector group includes a second reflector (6) and a third reflector (7). The second reflector (6) is mounted on a rotation axis, and the third reflector (7) is located on the optical axis of the mid-wave converging mirror (8). The second reflector group includes a beam splitter (5) and a first reflector (10). The beam splitter (5) is mounted on a rotating axis and is located between the second reflector (6) and the visible light inner focusing tube (2). It is used to transmit mid-wave infrared light and reflect long-wave infrared light. The first reflector (10) is located on the optical axis of the long-wave converging mirror (11).

5. The method for aligning the optical axis and rotation axis of a dual-band de-rotation mechanism according to claim 4, characterized in that: The method for aligning the optical axis of the mid-wave infrared transmission optical path with the optical axis of the internal focusing tube is as follows: Rotate the rotary axis system and illuminate the crosshairs of the second crosshair center reflector (9) with the second finite light source (17); Adjust the focal length of the inner focusing tube (2), observe the circle drawing of the cross-line collimated image and the differentiated image of the second cross center reflection fixture (9), and adjust the second reflecting mirror (6) and the third reflecting mirror (7) to a 45° angle with the front reference plane of the de-rotation mechanism; Rotate the rotation axis system and adjust the attitude of the mid-wave converging mirror (8) so that the circle drawing amount of the collimated image and the cross-shaped image meets the range of 3″-6″ and 3μm-5μm respectively. That is, the optical axes of the second mirror (6), the third mirror (7), and the mid-wave converging mirror (8) are considered to coincide with the optical axis of the visible light internal focusing tube (2), that is, coaxial with the rotation axis system.

6. The method for aligning the optical axis and rotation axis of a dual-band de-rotation mechanism according to claim 5, characterized in that: The method for aligning the optical axis of the long-wave infrared transmission optical path with the optical axis of the internal focusing tube is as follows: Rotate the cycloid system and use the third finite light source (18) to illuminate the crosshairs of the first crosshair center reflector (12); Assemble the beam splitter (5), adjust the focal length of the visible light focusing tube (2), observe the circle drawing of its collimated image and the differentiated image, and adjust the first reflecting mirror (10) to a 45° angle with the front reference plane of the derotation mechanism. Rotate the rotation axis system and adjust the attitude of the long-wave converging mirror (11) so that the circle drawing amount of the collimated image and the cross-shaped image meets the range of 3″-6″ and 3μm-5μm respectively. It is considered that the optical axis of the beam splitter, the first reflecting mirror (10), and the long-wave converging mirror (11) coincides with the optical axis of the visible light internal focusing tube (2), that is, it is coaxial with the rotation axis system.

7. The method for aligning the optical axis and rotation axis of a dual-band de-rotation mechanism according to claim 6, characterized in that: The method for aligning the optical axis of the medium-wave detector (14) with the rotation axis of the despinning mechanism (1) is as follows: The infrared parallel light tube is placed on the optical platform (19) and located directly in front of the rotation axis of the de-rotation mechanism (1); the rotation axis with the mid-wave infrared transmission light path and the long-wave infrared transmission light path is installed on the two-dimensional adjustment table (15). By observing the point target of the infrared parallel light tube (20) through the mid-wave detector (14), the rotation axis of the rotating de-rotation mechanism (1) is rotated, and the attitude of the two-dimensional adjustment stage (15) is adjusted so that the circle drawing amount of the point target of the infrared parallel light tube (20) meets the set range. The attitude of the mid-wave detector (14) is adjusted so that the point target is at the center of the target surface of the mid-wave detector (14).

8. The method for aligning the optical axis and rotation axis of a dual-band de-rotation mechanism according to claim 7, characterized in that: The method for aligning the optical axis of the long-wave detector (13) with the rotation axis of the despinning mechanism (1) is as follows: The infrared parallel light tube (20) point target is observed by the long-wave detector (13). The circle drawing amount of the infrared parallel light tube (20) point target is made to meet the set range by adjusting the two-dimensional adjustment stage (15). The attitude of the long-wave detector (13) is adjusted so that the point target is in the center of the target surface of the long-wave detector.

9. A system for aligning the optical axis and rotation axis of a dual-band de-rotation mechanism, characterized in that: The system is used to implement the method for aligning the optical axis and rotation axis of the dual-band despinning mechanism as described in any one of claims 1-8. The system includes a rotation axis system of the despinning mechanism, a four-dimensional adjustable cross-shaped center dividing plate (4) mounted on the rotation axis system, a mid-wave infrared transmission optical path and a long-wave infrared transmission optical path located on both sides of the rotation axis system, an inner focusing optical tube or an infrared parallel optical tube located in front of the rotation axis system, and a mid-wave detector and a long-wave detector constituting the despinning mechanism. The internal focusing light tube is used to adjust the mid-wave infrared transmission light path, the long-wave infrared transmission light path and the rotation axis system to be coaxial. The mid-wave infrared transmission light path consists of a second finite light source (17), a second cross-shaped central reflection fixture (9), and a mid-wave converging mirror (8), which reflects the mid-wave infrared transmission light path onto the inner focusing light tube through the first reflecting mirror group. The long-wave infrared transmission light path consists of a third finite light source (18), a first cross-shaped central reflector (12), and a long-wave converging mirror (11), and the long-wave infrared transmission light path is refracted into the inner focusing light tube through the second reflector group. The infrared collimator is used to adjust the coaxiality of the medium-wave detector, the long-wave detector, and the rotary axis system.

10. The dual-band de-rotation mechanism optical axis and rotation axis alignment system according to claim 9, characterized in that: The surfaces of the four-dimensional adjustable cross center differentiation plate (4), the second cross center reflection fixture (9), and the first cross center reflection fixture (12) are all coated with a metal reflective film, and a cross is engraved at the center.

Images