A transmission type wide dynamic range infrared polarization degree radiation source device

Abstract

The present application relates to a kind of transmission type wide dynamic range infrared polarization degree radiation source device, including blackbody radiation source, collimator and polarization adjustment part, collimator is set on the output light path of blackbody radiation source.Polarization adjustment part includes cavity and four infrared optical flat, one end of cavity is equipped with light inlet hole, light inlet hole is set on the output light path of collimator, the other end of cavity is equipped with light outlet hole, four infrared optical flat is spaced apart in cavity, and located between light inlet hole and light outlet hole, infrared line exported by collimator successively passes through four infrared optical flat, and linearly polarized light of the polarization degree corresponding to incident angle is exported from light outlet hole, and the inclination angle of infrared optical flat is adjusted by servo motor.The device is simple in structure, portable, easy to adjust, the infrared polarization degree output in 0-0.92 range is continuously adjustable, the linearly polarized degree of existing transmission type infrared polarization degree radiation source is increased to about one times, and precision can also basically meet ground test needs.

Description

Technical Field

[0001] This invention relates to the field of optical detection technology, and in particular to a transmissive wide dynamic range infrared polarization radiation source device. Background Technology

[0002] Infrared polarization imaging technology, as a cutting-edge infrared imaging technology, can not only obtain radiation intensity information of the target scene, but also polarization parameters such as polarization degree, polarization angle, and polarization ellipticity. This increases the dimension of information about the target scene, enhances the difference between the target and the background, and improves the contrast of the target scene, thereby enabling the detection and identification of targets that are dim, camouflaged, or hidden.

[0003] In the process of quantitative processing of infrared polarization imaging information, false polarization information often appears due to the polarization effect generated by the system itself, which in turn affects the accuracy of quantitative measurement of polarization characteristics. Therefore, in order to accurately obtain the polarization information of the target, it is necessary to carry out high-precision polarization calibration of the infrared polarization imaging system to correct or eliminate the polarization signal of the instrument itself. However, to achieve polarization radiation calibration of the infrared polarization imaging system, a high-precision and adjustable infrared polarization radiation source is required.

[0004] Currently, commonly used infrared polarization radiation calibration sources are mainly divided into three categories: The first category utilizes linear polarizers and unpolarized radiation sources (blackbody) to generate polarized radiation with different polarization states. However, the polarizers in this type of infrared polarization radiation source are affected by their own radiation and the radiation from the surrounding environment, making it difficult to obtain a high degree of polarization. The second category is reflective infrared polarization radiation sources, which utilize the reflection of infrared radiation incident on two different medium surfaces, thus producing a polarization phenomenon. Different polarized light can be generated by adjusting the incident angle of the radiation. However, in practical applications, since the angle of reflected radiation also changes with the incident angle, the observation angle needs to be considered, making it inconvenient to use. The third category is transmissive infrared polarization radiation sources, which utilize the polarization effect caused by multiple reflections and refractions of infrared radiation on the medium surface, thereby producing infrared radiation with different degrees of linear polarization. Among these, transmissive infrared polarization radiation sources are widely used in the polarization calibration of infrared polarization measurement equipment due to their large dynamic range of output polarization degree, high parallelism, and relatively high polarization degree output accuracy. However, the maximum polarization degree output of the existing transmissive infrared polarization radiation source is only 0.48. For targets with strong reflection, such as aluminum, the infrared polarization degree may be greater than 0.48 at certain observation angles. The dynamic range of polarization degree adjustment of the existing transmissive infrared polarization radiation source is insufficient and cannot meet the testing requirements. Summary of the Invention

[0005] The purpose of this invention is to provide a transmissive wide dynamic range infrared polarization radiation source device, which has the ability to continuously adjust the infrared polarization over a wide dynamic range, thereby improving the dynamic range of polarization adjustment of the transmissive infrared polarization radiation source.

[0006] To achieve the above objectives, the present invention provides a transmissive wide dynamic range infrared polarization radiation source device, comprising:

[0007] A blackbody radiation source is used to emit infrared radiation of different wavelengths;

[0008] A collimator, positioned in the output optical path of a blackbody radiation source, is used to collimate the infrared radiation emitted by the blackbody radiation source; and

[0009] The polarization adjustment unit includes a cavity and four infrared optical plates. One end of the cavity has an entrance hole, which is located in the output light path of the collimator. The other end has an exit hole. The four infrared optical plates are arranged parallel to each other in the cavity and are located between the entrance hole and the exit hole. The infrared light output by the collimator passes through the four infrared optical plates in sequence and is output from the exit hole as linearly polarized light with a polarization degree corresponding to the incident angle. Each infrared optical plate is mounted on a bracket. The upper or lower end of the bracket is connected to the output shaft of a servo motor and can rotate synchronously with the output shaft to adjust the tilt angle of the infrared optical plate.

[0010] Optionally, the effective light transmission diameters of the entrance aperture and the exit aperture are the same and larger than the effective light transmission diameter of the collimator.

[0011] Optionally, the incident angle of the infrared rays is the same as the tilt angle of the infrared optical plate.

[0012] Optionally, the tilt angle of the infrared optical plate ranges from 0° to 60°.

[0013] Optionally, the four infrared optical plates are divided into two groups along the direction from the light entrance aperture to the light exit aperture. The first two infrared optical plates form one group, and the last two infrared optical plates form another group. The interval between the two infrared optical plates in each group is smaller than the interval between the two groups of infrared optical plates.

[0014] Optionally, the output shaft is also connected to a photoelectric encoder for real-time feedback of the rotation angle of the infrared optical plate.

[0015] The above-mentioned technical solution of the present invention has the following advantages: The transmissive wide dynamic range infrared polarization radiation source device provided by the present invention includes a blackbody radiation source, a collimator, and a polarization adjustment unit. The blackbody radiation source is used to emit unpolarized infrared rays of different wavelengths. The collimator is disposed in the output optical path of the blackbody radiation source. The polarization adjustment unit includes a cavity and four infrared optical plates. One end of the cavity is provided with an entrance hole, which is disposed in the output optical path of the collimator. The other end of the cavity is provided with an exit hole. The four infrared optical plates are arranged parallel and spaced apart in the cavity and are located between the entrance hole and the exit hole. The infrared rays output by the collimator pass through the four infrared optical plates in sequence, and after eight refractions, linearly polarized light with a polarization degree corresponding to the incident angle is output from the exit hole. Each infrared optical plate is mounted on a bracket. The upper or lower end of the bracket is connected to the output shaft of a servo motor. The bracket can rotate synchronously with the output shaft to adjust the tilt angle of the infrared optical plate. During the adjustment process, the four infrared optical plates must remain parallel at all times. This radiation source device has a simple structure, is portable, and is easy to adjust. It can continuously adjust the output infrared polarization degree within the range of 0-0.92, which increases the linear polarization degree of the existing transmission infrared polarization degree radiation source output by about 100%, and its accuracy can basically meet the needs of ground testing. Attached Figure Description

[0016] The accompanying drawings are provided for illustrative purposes only, and the proportions and quantities of the components in the drawings may not be consistent with the actual product.

[0017] Figure 1 This is a schematic diagram of the structure of a transmissive wide dynamic range infrared polarization radiation source device according to Embodiment 1 of the present invention;

[0018] Figure 2 yes Figure 1 Another angle diagram of the connection structure between the servo motor and the infrared optical flat panel;

[0019] Figure 3 This is a schematic diagram of another transmissive wide dynamic range infrared polarization radiation source device in Embodiment 2 of the present invention.

[0020] In the picture:

[0021] 1: Blackbody radiation source;

[0022] 2: Parallel light tube;

[0023] 3: Polarization adjustment unit;

[0024] 31: Cavity;

[0025] 311: Light entrance aperture;

[0026] 312: Light hole;

[0027] 32: Infrared optical flat panel;

[0028] 33: Bracket;

[0029] 34: Servo motor;

[0030] 341: Output shaft;

[0031] 35: Photoelectric encoder. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] Example 1

[0034] See Figure 1 and Figure 2 As shown, the transmissive wide dynamic range infrared polarization radiation source device provided in this embodiment of the invention includes a blackbody radiation source 1, a collimator 2, and a polarization adjustment unit 3. The blackbody radiation source 1 is a surface-source blackbody used to emit unpolarized infrared radiation of different wavelengths. The collimator 2 is disposed in the output optical path of the blackbody radiation source 1 and is used to collimate the infrared radiation emitted by the blackbody radiation source 1.

[0035] The polarization adjustment unit 3 includes a cavity 31 and four infrared optical plates 32. One end of the cavity 31 has an entrance aperture 311, which is positioned in the output light path of the collimator 2. The other end of the cavity 31 has an exit aperture 312. The four infrared optical plates 32 are arranged parallel to each other within the cavity 31, located between the entrance aperture 311 and the exit aperture 312. The infrared light output from the collimator 2 passes sequentially through the four infrared optical plates 32, undergoes eight refractions, and is output from the exit aperture 312 as linearly polarized light with a polarization degree corresponding to the incident angle θ1. Each infrared optical plate 32 is mounted on a bracket 33. The lower end of the bracket 33 is connected to the output shaft 341 of a servo motor 34, which is fixed to the lower side inside the cavity 31. The bracket 33 can rotate synchronously with the output shaft 341 to adjust the tilt angle θ2 of the infrared optical plate 32. The tilt angle of the infrared optical plate 32 is adjusted by rotating the bracket 33 driven by the servo motor 34 at a constant speed. During the adjustment process, the four infrared optical plates 32 must remain parallel at all times, i.e., they are adjusted simultaneously. This radiation source device has a simple structure, is portable, and is easy to adjust. It can continuously adjust the output infrared polarization degree within the range of 0-0.92, which increases the linear polarization degree of the existing transmission-type infrared polarization radiation source by about 100%, and its accuracy can basically meet the needs of ground testing.

[0036] In this embodiment, the incident angle θ1 of the infrared light is the same as the tilt angle θ2 of the infrared optical plate.

[0037] In this embodiment, the tilt angle θ2 of the infrared optical plate ranges from 0° to 60°. For example, 0°, 5°, 8°, 9.5°, 10°, 15°, 25°, 32°, 40°, 45°, 60°, etc.

[0038] In some embodiments, the effective light transmission diameters of the light inlet aperture 311 and the light outlet aperture 312 are the same and larger than the effective light transmission diameter of the collimator 2.

[0039] In some embodiments, the four infrared optical plates 32 are divided into two groups along the direction from the light entrance aperture 311 to the light exit aperture 312. The first two infrared optical plates 32 form one group, and the last two infrared optical plates 32 form another group. The interval between the two infrared optical plates 32 in each group is smaller than the interval between the two groups of infrared optical plates 32.

[0040] To further improve accuracy and ensure the precision of angle adjustment, in some implementation methods, see [link to implementation details]. Figure 2 As shown, the output shaft 341 is also connected to a photoelectric encoder 35, which is used to provide real-time feedback on the rotation angle of the infrared optical plate 32. The photoelectric encoder 35 can be connected to the output shaft 341 via a coupling or similar structure.

[0041] In this embodiment, the infrared optical flat panel 32 can be selected as needed, such as a single-crystal silicon wafer.

[0042] Example 2

[0043] See Figure 3 As shown, this embodiment 2 is basically the same as embodiment 1, and the similarities will not be repeated. The difference is that each infrared optical plate 32 is mounted on the bracket 33, and the upper end of the bracket 33 is connected to the output shaft 341 of the servo motor 34, that is, the servo motor 34 is fixed on the upper side inside the cavity 31.

[0044] Any aspects not described in detail in this invention are existing technology or common knowledge.

[0045] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that not every embodiment contains only one independent technical solution, and in the absence of conflict between solutions, the various technical features mentioned in each embodiment can be combined in any way to form other implementation methods that can be understood by those skilled in the art.

[0046] Furthermore, without departing from the scope of the present invention, modifications to the technical solutions described in the foregoing embodiments, or equivalent substitutions of some of the technical features, shall not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A transmissive wide dynamic range infrared polarization radiation source device, characterized in that, include: A blackbody radiation source is used to emit infrared radiation of different wavelengths; A collimator is placed in the output optical path of the blackbody radiation source to collimate the infrared rays emitted by the blackbody radiation source. as well as The polarization adjustment unit includes a cavity and four infrared optical plates. One end of the cavity has an entrance hole, which is located in the output light path of the collimator. The other end has an exit hole. The four infrared optical plates are arranged parallel to each other in the cavity and are located between the entrance hole and the exit hole. The infrared light output by the collimator passes through the four infrared optical plates in sequence and is output from the exit hole as linearly polarized light with a polarization degree corresponding to the incident angle. Each infrared optical plate is mounted on a bracket. The upper or lower end of the bracket is connected to the output shaft of a servo motor and can rotate synchronously with the output shaft to adjust the tilt angle of the infrared optical plate.

2. The transmissive wide dynamic range infrared polarization radiation source device according to claim 1, characterized in that: The effective light transmission diameters of the light inlet and light outlet are the same and larger than the effective light transmission diameter of the collimator.

3. The transmissive wide dynamic range infrared polarization radiation source device according to claim 1, characterized in that: The incident angle of the infrared rays is the same as the tilt angle of the infrared optical plate.

4. The transmissive wide dynamic range infrared polarization radiation source device according to claim 1, characterized in that: The tilt angle of the infrared optical plate ranges from 0° to 60°.

5. The transmissive wide dynamic range infrared polarization radiation source device according to claim 1, characterized in that: The four infrared optical plates are divided into two groups along the direction from the light inlet to the light outlet. The first two infrared optical plates form one group, and the last two infrared optical plates form another group. The interval between the two infrared optical plates in each group is smaller than the interval between the two groups of infrared optical plates.

6. The transmissive wide dynamic range infrared polarization radiation source device according to claim 1, characterized in that: The output shaft is also connected to a photoelectric encoder, which is used to provide real-time feedback on the rotation angle of the infrared optical plate.

Images