Infrared correction device for optical system

Abstract

The invention provides an infrared correction device for an optical system, and belongs to the technical field of infrared photoelectric detection systems. A sliding unit; the black body is fixed on the sliding block of the sliding unit, the sliding block is fixedly connected with the spectroscope, and the black body is located on one side of the projection surface of the spectroscope and used for providing a constant-temperature black body light source for the infrared detector; and the driving mechanism drives the black body to cut in or out of the optical path of the optical system. According to the infrared correction and wave band light splitting device based on the constant-temperature source black body, through matching parameter design among the units, non-uniform correction is carried out on an infrared optical system, the influence of environmental factors on the infrared optical system is greatly reduced, and the imaging quality of the infrared optical system is ensured; and due to waveband light splitting, the common-aperture multi-waveband fusion design of the optical system is realized, and the function of the product is improved.

Description

Technical Field

[0001] The present application relates to the field of infrared photoelectric detection systems, and in particular to an infrared correction device for optical systems. Background Art

[0002] In infrared photoelectric detection systems, the typical feature of infrared focal plane image signals is that different image units correspond to different infrared detector units. Under the same external irradiance, due to the inconsistent infrared responsivity of each pixel and the influence of many factors such as temperature changes in the environment, optical system errors, charge transfer efficiency, noise, etc., the output of each pixel is not consistent, which seriously affects the performance of the thermal imaging system. Therefore, the infrared focal plane array must be corrected for non-uniformity.

[0003] There are many non-uniformity correction technologies for infrared optical systems. However, under airborne environmental conditions, it is difficult to ensure the imaging quality of the infrared optical system due to temperature changes, which affects the detection distance and resolution of the airborne infrared photoelectric detection system. Summary of the invention

[0004] In view of this, the present application provides an infrared correction device for an optical system, which solves the problems in the prior art, ensures the imaging quality of the infrared optical system, and realizes the common aperture multi-band fusion design of the optical system through band splitting.

[0005] The infrared correction device for an optical system provided in the present application adopts the following technical solution:

[0006] An infrared correction device for an optical system, the optical system comprising a beam splitter, comprising:

[0007] A mounting base, mounted on a bracket of an optical system platform;

[0008] A sliding unit, wherein a guide rail of the sliding unit is mounted on the mounting base, the guide rail is perpendicular to the optical axis of the optical system, and a slider of the sliding unit is slidably mounted on the guide rail;

[0009] A black body is fixed on the slider, the slider is fixedly connected to the beam splitter, the black body is located on one side of the projection surface of the beam splitter, and is used to provide a constant temperature black body light source to the infrared detector;

[0010] A driving mechanism, mounted on the mounting base, for driving the slider to slide along the guide rail so that the black body cuts into or out of the optical path of the optical system;

[0011] A first positioning mechanism is located at one end of the guide rail and is used to abut against the slider when the black body cuts into the optical path. When the first positioning mechanism abuts against the slider, the correction target surface of the black body faces the optical axis of the optical system;

[0012] The second positioning mechanism is located at the other end of the guide rail and is used to abut against the slider when the black body cuts out of the light path. When the second positioning mechanism abuts against the slider, the black body is reset.

[0013] Optionally, the sliding unit is two parallel rolling linear guide rail sub-units.

[0014] Optionally, the driving mechanism includes a motor, a gear and a rack, the motor is mounted on the mounting base, the gear is fixedly connected to the rotating shaft of the motor, the rack is fixedly connected to the black body, and the length direction of the rack is parallel to the guide rail of the sliding unit.

[0015] Optionally, the gear and rack are anti-backlash transmission.

[0016] Optionally, the first positioning mechanism includes a first positioning block and a second positioning block, the first positioning block is fixed to the first end of the guide rail of one of the rolling linear guide sub-units, the second positioning block is fixed to the first end of the guide rail of the other rolling linear guide sub-unit, the first positioning block and the second positioning block are located on the same side of the beam splitter, and the first positioning block and the second positioning block are used to abut the slider.

[0017] Optionally, the second positioning mechanism includes a third positioning block and a fourth positioning block, the third positioning block is fixed at the middle of one of the rolling linear guide sub-unit guide rails, the fourth positioning block is fixed at the second end of the other rolling linear guide sub-unit guide rail, the third positioning block and the fourth positioning block are located on the same side of the spectrometer, and the third positioning block and the fourth positioning block are used to abut the slider.

[0018] Optionally, a first magnet adsorption unit is provided at the second end of the guide rail of one of the rolling linear guide sub-units, and a second magnet adsorption unit is provided at the second section of the guide rail of the other rolling linear guide sub-unit. A ferromagnetic adsorption block is provided on the side of the black body facing the second end of the guide rail. When the black body cuts out the light path and the slider abuts against the second positioning mechanism, the first magnet adsorption unit and the second magnet adsorption unit adsorb the ferromagnetic adsorption block.

[0019] In summary, this application includes the following beneficial technical effects:

[0020] The infrared correction and band spectrometry device based on the constant temperature source blackbody of the present invention is designed through matching parameters between each unit. By performing non-uniform correction on the infrared optical system, the influence of many factors such as environmental temperature change, optical system error, charge transfer efficiency, noise, etc. on the infrared optical system is greatly reduced, thereby ensuring the imaging quality of the infrared optical system; the band spectrometry realizes the fusion design of multi-band with common aperture of the optical system, thereby improving the function of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present application, 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 application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 This is a front view of the infrared correction device for the optical system of the present application;

[0023] Figure 2 A top view of the infrared correction device for an optical system of the present application;

[0024] Figure 3 This is an axonometric diagram of the infrared correction device used in the optical system of the present application.

[0025] Explanation of the reference numerals in the accompanying drawings: 1. Motor; 2. First rolling linear guide sub-unit; 3. First positioning block; 4. Spectrometer; 5. Second rolling linear guide sub-unit; 6. Second positioning block; 7. Mounting base; 8. Black body; 9. Third positioning block; 10. First magnet adsorption unit; 11. Ferromagnetic adsorption block; 12. Second magnet adsorption unit; 13. Fourth positioning block; 14. Rack; 15. Fixed bracket; 16. Gear. DETAILED DESCRIPTION

[0026] The embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0027] The following describes the implementation methods of the present application through specific examples, and those skilled in the art can easily understand other advantages and effects of the present application from the contents disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The present application can also be implemented or applied through other different specific implementation methods, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present application. It should be noted that, in the absence of conflict, the following embodiments and the features in the embodiments can be combined with each other. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without making creative work belong to the scope of protection of the present application.

[0028] It should be noted that various aspects of the embodiments within the scope of the appended claims are described below. It should be apparent that the aspects described herein can be embodied in a wide variety of forms, and any specific structure and / or function described herein is merely illustrative. Based on the present application, it should be understood by those skilled in the art that an aspect described herein can be implemented independently of any other aspect, and two or more of these aspects can be combined in various ways. For example, any number of aspects described herein can be used to implement the device and / or practice the method. In addition, other structures and / or functionalities other than one or more of the aspects described herein can be used to implement this device and / or practice this method.

[0029] It should also be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present application. The illustrations only show the components related to the present application rather than being drawn according to the number, shape and size of the components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed at will, and the component layout may also be more complicated.

[0030] Additionally, in the following description, specific details are provided to facilitate a thorough understanding of the examples. However, it will be understood by those skilled in the art that the aspects described may be practiced without these specific details.

[0031] An embodiment of the present application provides an infrared correction device for an optical system.

[0032] like Figures 1 to 3 As shown, an infrared correction device for an optical system, the optical system includes a beam splitter 4, including:

[0033] The mounting base 7 is mounted on the bracket of the optical system platform; the sliding unit, the guide rail of the sliding unit is mounted on the mounting base 7, the guide rail is perpendicular to the optical axis of the optical system, and the slider of the sliding unit is slidably mounted on the guide rail; the black body 8 is fixed on the slider, the slider is fixedly connected to the spectroscope 4, the black body 8 is located on the projection surface side of the spectroscope 4, and is used to provide a constant temperature black body light source to the infrared detector; the driving mechanism is mounted on the mounting base 7, the driving mechanism is used to drive the slider to slide along the guide rail so that the black body 8 cuts in or out of the optical path of the optical system, and controls the constant temperature source black body 8 to cut into the set position in the infrared optical system to realize multi-stage correction based on the constant temperature source black. The target surface effective diameter of the constant temperature source black body 8 is ≥φ50mm, the target surface temperature uniformity is <0.5℃, and the temperature stabilization time is: ≤60s.

[0034] The first positioning mechanism is located at one end of the guide rail, and is used for abutting the slider when the black body 8 cuts into the light path. When the first positioning mechanism abuts the slider, the correction target surface of the black body 8 faces the optical axis of the optical system. The second positioning mechanism is located at the other end of the guide rail, and is used for abutting the slider when the black body 8 cuts out of the light path. When the second positioning mechanism abuts the slider, the black body 8 is reset.

[0035] The sliding unit is two parallel rolling linear guide sub-units, namely the first rolling linear guide sub-unit 2 and the second rolling linear guide sub-unit 5. The parallelism of the two rolling linear guide sub-units is required to be ≤20″ to ensure smooth operation within the full stroke without jamming. The first rolling linear guide sub-unit 2 and the second rolling linear guide sub-unit 5 are stainless steel, miniature, lightly preloaded, precision-grade rolling linear guides, and the operating temperature requirement is -55℃~+70℃.

[0036] The driving mechanism includes a motor 1, a gear 16 and a rack 14. The motor 1 is mounted on the mounting base 7 through a fixing bracket 15. The gear 16 is fixedly connected to the rotating shaft of the motor 1. The rack 14 is fixedly connected to the black body 8. The length direction of the rack 14 is parallel to the guide rail of the sliding unit. The driving mechanism also includes an encoding unit, which controls the start and stop of the motor 1 to achieve power-off locking after the black body 8 is in place.

[0037] The gear 16 and the rack 14 are backlash-eliminating transmission.

[0038] The first positioning mechanism includes a first positioning block 3 and a second positioning block 6, the first positioning block 3 is fixed to the first end of one of the rolling linear guide sub-unit guide rails, the second positioning block 6 is fixed to the first end of the other rolling linear guide sub-unit guide rail, the first positioning block 3 and the second positioning block 6 are located on the same side of the beam splitter 4, and the first positioning block 3 and the second positioning block 6 are used to abut the slider.

[0039] The second positioning mechanism includes a third positioning block 9 and a fourth positioning block 13. The third positioning block 9 is fixed in the middle of one of the rolling linear guide sub-unit guide rails, and the third positioning block 9 is arranged at the second end of the guide rail. The fourth positioning block 13 is fixed at the second end of the other rolling linear guide sub-unit guide rail. The third positioning block 9 and the fourth positioning block 13 are located on the same side of the beam splitter 4. The third positioning block 9 and the fourth positioning block 13 are used to abut the slider.

[0040] In one embodiment, the length of the slider of the first rolling linear guide sub-unit 2 is greater than the length of the slider of the second rolling linear guide sub-unit 5, and both ends of the slider of the first rolling linear guide sub-unit 2 protrude from the slider of the second rolling linear guide sub-unit 5, the first positioning block 3 and the second positioning block 6 are staggered in the length direction of the guide rail, and the third positioning block 9 and the fourth positioning block 13 are staggered; in other embodiments, the lengths of the two sliders can be consistent and the ends are aligned. In this embodiment, the first positioning block 3 and the second positioning block 6 are aligned with each other, and the third positioning block 9 and the fourth positioning block 13 are aligned with each other.

[0041] The first positioning mechanism and the second positioning mechanism are used to achieve mechanical limitation of the black body 8 and to protect the sliders and guide rails in the first rolling linear guide rail sub-unit 2 and the second rolling linear guide rail sub-unit 5 from separation.

[0042] A first magnet adsorption unit 10 is provided at the second end of the guide rail of one of the rolling linear guide sub-units, and a second magnet adsorption unit 12 is provided at the second section of the guide rail of the other rolling linear guide sub-unit. A ferromagnetic adsorption block 11 is provided on the side of the black body 8 facing the second end of the guide rail. When the black body 8 cuts out the light path and the slider abuts against the second positioning mechanism, the first magnet adsorption unit 10 and the second magnet adsorption unit 12 adsorb the ferromagnetic adsorption block 11.

[0043] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. An infrared correction device for an optical system, the optical system comprising a beam splitter (4), characterized in that: include: A mounting base (7) mounted on a bracket of the optical system platform; A sliding unit, wherein a guide rail of the sliding unit is mounted on the mounting base (7), the guide rail is perpendicular to the optical axis of the optical system, and a slider of the sliding unit is slidably mounted on the guide rail; A black body (8) is fixed on the slider, the slider is fixedly connected to the beam splitter (4), and the black body (8) is located on one side of the projection surface of the beam splitter (4) and is used to provide a constant temperature black body light source for the infrared detector; A driving mechanism, mounted on the mounting base (7), the driving mechanism being used to drive the slider to slide along the guide rail so that the black body (8) cuts into or out of the optical path of the optical system; A first positioning mechanism, located at one end of the guide rail, is used to abut against the slider when the black body (8) cuts into the optical path, and when the first positioning mechanism abuts against the slider, the correction target surface of the black body (8) faces the optical axis of the optical system; The second positioning mechanism is located at the other end of the guide rail and is used to abut against the slider when the black body (8) cuts out the light path. When the second positioning mechanism abuts against the slider, the black body (8) is reset.

2. The infrared correction device for an optical system according to claim 1, characterized in that: The sliding unit is two parallel rolling linear guide rail sub-units.

3. The infrared correction device for an optical system according to claim 1, characterized in that: The driving mechanism comprises a motor (1), a gear (16) and a rack (14); the motor (1) is mounted on the mounting base (7); the gear (16) is fixedly connected to the rotating shaft of the motor (1); the rack (14) is fixedly connected to the black body (8); and the length direction of the rack (14) is parallel to the guide rail of the sliding unit.

4. The infrared correction device for an optical system according to claim 3, characterized in that: The gear (16) and the rack (14) are driven in a backlash-eliminating manner.

5. The infrared correction device for an optical system according to claim 2, characterized in that: The first positioning mechanism comprises a first positioning block (3) and a second positioning block (6); the first positioning block (3) is fixed to the first end of one of the rolling linear guide rail sub-unit guide rails; the second positioning block (6) is fixed to the first end of the other rolling linear guide rail sub-unit guide rail; the first positioning block (3) and the second positioning block (6) are located on the same side of the beam splitter (4); the first positioning block (3) and the second positioning block (6) are used to abut against the slider.

6. The infrared correction device for an optical system according to claim 5, characterized in that: The second positioning mechanism comprises a third positioning block (9) and a fourth positioning block (13); the third positioning block (9) is fixed at the middle of one of the rolling linear guide rail sub-unit guide rails; the fourth positioning block (13) is fixed at the second end of the other rolling linear guide rail sub-unit guide rail; the third positioning block (9) and the fourth positioning block (13) are located on the same side of the beam splitter (4); and the third positioning block (9) and the fourth positioning block (13) are used to abut against the slider.

7. The infrared correction device for an optical system according to claim 6, characterized in that: A first magnetic adsorption unit (10) is provided at the second end of the guide rail of one of the rolling linear guide rail sub-units, and a second magnetic adsorption unit (12) is provided at the second section of the guide rail of the other rolling linear guide rail sub-unit. A ferromagnetic adsorption block (11) is provided on the side of the black body (8) facing the second end of the guide rail. When the black body (8) cuts out the optical path and the slider abuts against the second positioning mechanism, the first magnetic adsorption unit (10) and the second magnetic adsorption unit (12) adsorb the ferromagnetic adsorption block (11).

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