Infrared optical system with non-uniform correction

Abstract

The invention provides an infrared optical system with non-uniformity correction, which belongs to the technical field of infrared photoelectric equipment and specifically comprises an infrared imaging group, a black body, a non-uniformity correction mirror and an infrared detector. The infrared optical system comprises a working state and a correction state; in a working state, the non-uniform correction mirror is located outside a light path of the infrared imaging group, and the infrared imaging group is used for receiving external infrared energy and converging the infrared energy to the infrared detector; in a correction state, the non-uniform correction mirror is located on a light path of the infrared imaging group, the non-uniform correction mirror shields light rays converged to the infrared detector by the infrared imaging group, the black body emits infrared radiation irradiated on the non-uniform correction mirror, and the non-uniform correction mirror emits the infrared radiation emitted by the black body to the infrared detector. According to the processing scheme, the method has the advantages that the non-uniformity correction time of the system is shortened, and the non-uniformity correction uniformity of the system is improved.

Description

Technical Field

[0001] The present application relates to the field of infrared optoelectronic devices, and in particular to an infrared optical system with non-uniform correction. Background Art

[0002] In the optical system of infrared optoelectronic equipment, due to the differences in detector processing technology, different imaging circuits, different optical designs and structural designs, when the infrared radiation of the same intensity is uniformly input, the infrared radiation response curves of all photosensitive elements of the infrared detector in the infrared imaging system are different, resulting in the output containing spatial noise or a constant pattern noise image. This non-uniformity in the system leads to a decrease in the system's ability to resolve temperature differences, which in turn affects the system's sensitivity.

[0003] Due to limitations in the internal space of the equipment, temperature-reaching time, temperature uniformity, etc., it is difficult to increase the size of the black body used to produce uniform infrared radiation. Summary of the invention

[0004] In view of this, the present application provides an infrared optical system with non-uniform correction, which solves the problems in the prior art. The correction optical path configuration of the present application is compact, and the correction blackbody target surface is small in size. It has the advantages of compressing the system's non-uniform correction time and improving the uniformity of the system's non-uniform correction.

[0005] The present application provides an infrared optical system with non-uniform correction, which adopts the following technical solution:

[0006] An infrared optical system with non-uniform correction includes an infrared imaging group, a black body, a non-uniform correction mirror and an infrared detector;

[0007] The infrared optical system includes a working state and a calibration state;

[0008] When in working state, the non-uniform correction mirror is located outside the optical path of the infrared imaging group, and the infrared imaging group is used to receive external infrared energy and converge it to the infrared detector;

[0009] In the correction state, the non-uniform correction mirror is located in the optical path of the infrared imaging group, the non-uniform correction mirror blocks the light from the infrared imaging group to the infrared detector, the black body emits infrared radiation irradiated on the non-uniform correction mirror, and the non-uniform correction mirror transmits the infrared radiation emitted by the black body to the infrared detector.

[0010] Optionally, the non-uniform correction mirror is a concave mirror, which diffuses the infrared radiation emitted by the black body and then reflects it to the infrared detector, and the infrared radiation emitted by the black body reaches the focal plane of the infrared detector uniformly.

[0011] Optionally, the non-uniform correction mirror is located between any two lenses of the infrared imaging group.

[0012] Optionally, the infrared optical system with non-uniform correction also includes a cutting-in and cutting-out mechanism, wherein the non-uniform correction mirror is movably mounted on the housing of the infrared optical system, and the output end of the cutting-in and cutting-out mechanism is connected to the non-uniform correction mirror, and the cutting-in and cutting-out mechanism drives the non-uniform correction mirror to enter and exit the optical path of the infrared imaging group.

[0013] Optionally, the diameter of the black body is 30 mm.

[0014] Optionally, the reflecting surface of the non-uniform correction mirror may be a plane, a spherical surface, a high-order aspherical surface or a free-form surface.

[0015] Optionally, the non-uniform correction mirror is made of aluminum alloy.

[0016] Optionally, the surface shape of the non-uniform correction mirror is an off-axis parabola.

[0017] In summary, this application includes the following beneficial technical effects:

[0018] In the correction state, the non-uniform correction mirror is located on the optical path of the infrared imaging group, the non-uniform correction mirror blocks the light from the infrared imaging group to the infrared detector, the black body emits infrared radiation irradiated on the non-uniform correction mirror, and the non-uniform correction mirror transmits the infrared radiation emitted by the black body to the infrared detector. The uniform infrared energy radiated by the black body finally reaches the infrared detector through the non-uniform correction mirror and the infrared imaging rear group, providing a uniform infrared background for the detector. The non-uniform correction optical path design of the present application is carried out in reverse. By setting the object height and the object side numerical aperture, real ray tracing is performed on the light emitted from the image plane of the infrared detector 4, and reversely passes through the infrared imaging rear group to compress the use size of the black body target surface, so as to ensure that when the infrared optical system is non-uniformly corrected, the infrared detector observes a uniform black body target surface, which has the advantages of compressing the system non-uniform correction time and improving the uniformity of the system non-uniform correction. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] 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.

[0020] Figure 1 This is a principle block diagram of an infrared optical system with non-uniform correction in the present application;

[0021] Figure 2This is a schematic structural diagram of the infrared optical system with non-uniform correction in the present application in a correction state.

[0022] Explanation of the reference numerals: 1. infrared imaging front group; 2. non-uniform correction mirror; 3. infrared imaging rear group; 4. infrared detector; 5. black body; 6. first lens; 7. second lens; 8. third lens; 9. fourth lens. DETAILED DESCRIPTION

[0023] The embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0024] 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.

[0025] 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.

[0026] 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.

[0027] 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.

[0028] The embodiments of the present application provide an infrared optical system with non-uniform correction.

[0029] like Figure 1 and Figure 2 As shown, an infrared optical system with non-uniform correction includes an infrared imaging group, a black body 5, a non-uniform correction mirror 2 and an infrared detector 4.

[0030] In the embodiment of the present application, the infrared imaging group includes an infrared imaging front group 1 and an infrared imaging rear group 3. The infrared imaging front group is composed of one or more lenses, and its output light can be parallel light or convergent light. The infrared imaging rear group 3 includes a first lens 6, a second lens 7, a third lens 8 and a fourth lens 9. The output light of the infrared imaging lens group can be parallel light or convergent light. The infrared imaging rear group 3 cooperates with the infrared imaging front group 1 to focus the infrared radiation energy from the scene onto the image plane of the infrared detector 4.

[0031] The infrared optical system includes a working state and a calibration state.

[0032] In the working state, the non-uniform correction mirror 2 is located outside the optical path of the infrared imaging group, and the infrared imaging group is used to receive external infrared energy and converge it to the infrared detector 4;

[0033] In the correction state, the non-uniform correction mirror 2 is located on the optical path of the infrared imaging group, the non-uniform correction mirror 2 blocks the light from the infrared imaging group to the infrared detector 4, the black body 5 emits infrared radiation irradiated on the non-uniform correction mirror 2, and the non-uniform correction mirror 2 transmits the infrared radiation emitted by the black body 5 to the infrared detector 4. The black body 5 radiates uniform infrared energy through the non-uniform correction mirror 2 and the infrared imaging back group 3 and finally reaches the infrared detector 4, providing a uniform infrared background for the detector.

[0034] The non-uniform correction optical path design of the present application is carried out in reverse. By setting the object height and the object numerical aperture, real ray tracing is performed on the light emitted from the image plane of the infrared detector 4, and reversely passes through the infrared imaging rear group 3. Taking this example, the light beam emitted from the image plane passes through the infrared imaging rear group 3 composed of the fourth lens 9, the third lens 8, the second lens 7, and the first lens 6 in sequence, and then passes through the cut-in non-uniform correction mirror 2 to reach the black body 5 target surface.

[0035] The non-uniform correction mirror 2 is a concave mirror, which diffuses the infrared radiation emitted by the black body 5 and reflects it to the infrared detector 4, and the infrared radiation emitted by the black body 5 evenly reaches the focal plane of the infrared detector 4. The surface shape of the non-uniform correction mirror 2 is an off-axis parabola, and the aperture of the non-uniform correction mirror 2 is φ80mm.

[0036] In other embodiments, the reflection surface of the non-uniform correction mirror 2 can be a plane, a spherical surface, a high-order aspherical surface or a free-form surface. Specifically, it can be designed according to the space envelope and the size of the black body 5 target surface, and the use size of the black body 5 target surface is compressed, and its surface is an off-axis parabola to ensure that in a limited system space, the light emitted from each point of the image surface can evenly see the black body 5 target surface and is within the effective size of the black body 5 target surface.

[0037] The non-uniform correction mirror 2 is made of aluminum alloy, and can also be made of commonly used reflector materials, including but not limited to quartz, microcrystal, glass, silicon, silicon carbide, etc. The surface of the non-uniform correction mirror 2 is coated with a high-reflection film to ensure that the black body 5 seen is uniform.

[0038] The non-uniform correction mirror 2 is located between any two lenses of the infrared imaging group.

[0039] The infrared optical system with non-uniform correction also includes a cutting-in and cutting-out mechanism, wherein the non-uniform correction mirror 2 is movably installed on the housing of the infrared optical system, and the output end of the cutting-in and cutting-out mechanism is connected to the non-uniform correction mirror 2, and the cutting-in and cutting-out mechanism drives the non-uniform correction mirror 2 to enter and exit the optical path of the infrared imaging group.

[0040] The diameter of the black body 5 is 30 mm.

[0041] When designing the non-uniform correction optical path of the present application, it is necessary to ensure the degree of diffusion of the image spot on the black body 5 target surface, while taking into account the use size of the target surface to avoid exceeding the effective size of the black body 5 target surface; the convergence point of the non-uniform correction optical path can be set in front of the target surface or behind the target surface. In this example, the convergence point of the optical path is set in front of the target surface.

[0042] 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 optical system with non-uniform correction, characterized in that It includes an infrared imaging group, a black body (5), a non-uniform correction mirror (2) and an infrared detector (4); The infrared optical system includes a working state and a calibration state; When in working state, the non-uniform correction mirror (2) is located outside the optical path of the infrared imaging group, and the infrared imaging group is used to receive external infrared energy and converge it to the infrared detector (4); In the correction state, the non-uniform correction mirror (2) is located on the optical path of the infrared imaging group, the non-uniform correction mirror (2) blocks the light from the infrared imaging group that converges to the infrared detector (4), the black body (5) emits infrared radiation that irradiates the non-uniform correction mirror (2), and the non-uniform correction mirror (2) transmits the infrared radiation emitted by the black body (5) to the infrared detector (4).

2. The infrared optical system with non-uniform correction according to claim 1, characterized in that: The non-uniform correction mirror (2) is a concave mirror, and the non-uniform correction mirror (2) diffuses the infrared radiation emitted by the black body (5) and then reflects it to the infrared detector (4), and the infrared radiation emitted by the black body (5) reaches the focal plane of the infrared detector (4) uniformly.

3. The infrared optical system with non-uniform correction according to claim 1, characterized in that: The non-uniform correction mirror (2) is located between any two lenses of the infrared imaging group.

4. The infrared optical system with non-uniform correction according to claim 1, characterized in that: The infrared optical system with non-uniform correction also includes a cut-in / cut-out mechanism, wherein the non-uniform correction mirror (2) is movably mounted on a housing of the infrared optical system, an output end of the cut-in / cut-out mechanism is connected to the non-uniform correction mirror (2), and the cut-in / cut-out mechanism drives the non-uniform correction mirror (2) to enter and exit the optical path of the infrared imaging group.

5. The infrared optical system with non-uniform correction according to claim 1, characterized in that: The diameter of the black body (5) is 30 mm.

6. The infrared optical system with non-uniform correction according to claim 1, characterized in that: The reflecting surface of the non-uniform correction mirror (2) may be a plane, a spherical surface, a high-order aspherical surface or a free-form surface.

7. The infrared optical system with non-uniform correction according to claim 1, characterized in that: The material of the non-uniform correction mirror (2) is aluminum alloy.

8. The infrared optical system with non-uniform correction according to claim 1, characterized in that: The surface shape of the non-uniform correction mirror (2) is an off-axis parabola.

Images