Device and method for testing active and passive polarization transmission characteristics by simulating multiple visibility

Abstract

The invention discloses an active and passive polarization transmission characteristic testing device and method for simulating multiple visibility, and relates to the field of polarization transmission detection. A set simulation environment is provided through the environment simulation unit; the visibility simulation unit provides particles for setting a simulation environment so as to change the visibility; the active polarized light receiving unit receives polarized light emitted by the active polarized light emitting unit to obtain polarization data; the passive polarized light receiving unit receives the polarized light emitted by the passive polarized light emitting unit to obtain a polarized image; the data analysis unit carries out resolving processing on the polarization image to obtain a polarization degree, and carries out comparative analysis according to the polarization data and the polarization degree to obtain an analysis result; the analysis result is used for representing the coincidence degree of active and passive polarization transmission. According to the invention, test and analysis of active and passive polarization transmission characteristics under different visibility can be realized.

Description

Technical Field

[0001] This application relates to the field of polarization transmission detection, and particularly to a device and method for testing the active and passive polarization transmission characteristics of simulated multi-visibility. Background Art

[0002] The transmission characteristics of polarized light are affected by suspended particles, aerosols, and atmospheric molecules in the atmospheric environment. Visibility is an important indicator for measuring the concentration of suspended particles in the atmosphere. In an environment with low visibility, such as haze weather or high humidity conditions, particulate matters such as water droplets, aerosols, and dust in the air will cause enhanced light scattering and absorption, thereby changing the polarization state of light.

[0003] Currently, the research on the transmission characteristics of polarized light mainly focuses on the propagation behavior under different atmospheric conditions, especially in a low-visibility environment (such as haze). Although some progress has been made in the fields of active polarization transmission, remote sensing detection, aerospace, etc., there are still many uncertain factors regarding the transmission characteristics of polarized light under complex meteorological conditions, especially in marine and urban environments.

[0004] These changes affect the performance of polarization detection systems. Especially in the case of low visibility, the propagation path of light is significantly affected, resulting in a decrease in the detection range and accuracy of the detection system. Therefore, studying the transmission characteristics of polarized light under different visibility conditions is of great significance for improving optical detection systems, enhancing target detection accuracy, and improving the transmission model in the atmospheric environment. Summary of the Invention

[0005] The purpose of this application is to provide a device and method for testing the active and passive polarization transmission characteristics of simulated multi-visibility, which can realize the testing and analysis of the active and passive polarization transmission characteristics under different visibility conditions.

[0006] To achieve the above purpose, this application provides the following solutions: In the first aspect, this application provides a device for testing the active and passive polarization transmission characteristics of simulated multi-visibility, including: an environmental simulation unit, an active polarized light emission unit, a passive polarized light emission unit, an active polarized light reception unit, a passive polarized light reception unit, a data analysis unit, and a visibility simulation unit; An optical barrier wall is provided inside the environmental simulation unit; based on the optical barrier wall, the environmental simulation unit is divided into two parts, obtaining a first part of the environmental simulation unit and a second part of the environmental simulation unit; An active polarized light reception unit is provided above the top surface of the first part of the environmental simulation unit, and an active polarized light emission unit is provided below the bottom surface of the first part of the environmental simulation unit. The active polarized light reception unit is on the outgoing light path of the active polarized light emission unit; The passive polarized light emitting unit and the passive polarized light receiving unit are both arranged at the second part of the environmental simulation unit; the passive polarized light receiving unit is arranged on the outgoing light path of the passive polarized light emitting unit, and the included angle between the outgoing light path of the passive polarized light emitting unit and the incoming light path of the passive polarized light receiving unit is 90°; the data analysis unit is respectively connected to the active polarized light receiving unit and the passive polarized light receiving unit; the visibility simulation unit is connected to the environmental simulation unit; The environmental simulation unit is used to provide a set simulation environment; the visibility simulation unit is used to provide particles in the set simulation environment to change the visibility; the active polarized light receiving unit is used to receive the polarized light emitted by the active polarized light emitting unit to obtain polarization data; the passive polarized light receiving unit is used to receive the polarized light emitted by the passive polarized light emitting unit to obtain a polarization image; The data analysis unit is used to perform a resolution process on the polarization image to obtain a degree of polarization, and perform a comparison and analysis based on the polarization data and the degree of polarization to obtain an analysis result; the analysis result is used to characterize the conformity of the active and passive polarization transmissions.

[0007] In a second aspect, the present application provides a method for testing the active and passive polarization transmission characteristics of simulated multi-visibility, which is implemented by using a testing device for the active and passive polarization transmission characteristics of simulated multi-visibility; the method for testing the active and passive polarization transmission characteristics of simulated multi-visibility includes: Obtain polarization data and a polarization image; the polarization data is detected by using the active polarized light receiving unit based on the polarized light emitted by the active polarized light emitting unit under a set simulation environment and visibility; the polarization image is obtained by using the passive polarized light receiving unit to receive the polarization characteristics of reflection and scattering based on the polarized light emitted by the passive polarized light emitting unit under a set simulation environment and visibility; Perform a resolution process on the polarization image to obtain a degree of polarization; Perform a comparison and analysis based on the polarization data and the degree of polarization to obtain an analysis result; the analysis result is used to characterize the conformity of the active and passive polarization transmissions.

[0008] Optionally, performing a resolution process on the polarization image to obtain a degree of polarization specifically includes: Convert the polarization image into a grayscale value image; Calculate the polarization intensity and the total light intensity based on the grayscale value image; the calculation formula for the polarization intensity is: ; The calculation formula for the total light intensity is: ; Calculate the degree of polarization based on the polarization intensity and the total light intensity; the calculation formula for the degree of polarization is: ; wherein, is the polarization intensity; is the total light intensity; is the grayscale value image of the polarization component in the 0° direction; is the grayscale value image of the polarization component in the 45° direction; is the grayscale value image of the polarization component in the 90° direction; is the grayscale value image of the polarization component in the 135° direction; is the degree of polarization; is the pixel point coordinate in the grayscale value image.

[0009] According to the specific embodiments provided by the present application, the present application discloses the following technical effects: The present application provides a device and method for testing the active and passive polarization transmission characteristics of simulated multi-visibility. The environmental simulation unit provides a set simulated environment, and the visibility simulation unit provides particles in the set simulated environment to change the visibility. Then, the active polarization light receiving unit receives the polarized light emitted by the active polarization light emitting unit to obtain polarization data; the passive polarization light receiving unit receives the polarized light emitted by the passive polarization light emitting unit to obtain a polarization image; the data analysis unit performs calculation and processing on the polarization image to obtain the degree of polarization, and performs comparison and analysis based on the polarization data and the degree of polarization to obtain an analysis result, which is used to characterize the conformity of the active and passive polarization transmissions. The present application constructs environments with different visibilities based on the environmental simulation unit and the visibility simulation unit, and then processes and compares and analyzes the information under active polarization and passive polarization, that is, polarization data and polarization images, to determine the conformity of the active and passive polarization transmissions, so as to realize the test and analysis of the active and passive polarization transmission characteristics under different visibilities. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0011] Figure 1 is the overall structural schematic diagram of the device for testing the active and passive polarization transmission characteristics of simulated multi-visibility; Figure 2 is the top view of the environmental simulation unit; Figure 3 is the flowchart of the method for testing the active and passive polarization transmission characteristics of simulated multi-visibility; Figure 4 is the schematic diagram of the operation steps of the method for testing the active and passive polarization transmission characteristics of simulated multi-visibility; Figure 5 It is a polarization state - degree of polarization curve graph.

[0012] Reference numerals: Environmental simulation unit - 1, active polarized light emission unit - 2, passive polarized light emission unit - 3, active polarized light reception unit - 4, passive polarized light reception unit - 5, gas circulation unit - 6, optical barrier wall - 7, visibility simulation unit - 8, data analysis unit - 9, visibility simulation control unit - 10, system overall control center - 11, visibility detection unit - 12, multi - wavelength laser - 201, first ultra - wideband visible / near - infrared polarizer - 202, first quarter - wave plate - 203, first beam expander - 204, full - band halogen lamp - 301, second ultra - wideband visible / near - infrared polarizer - 302, second quarter - wave plate - 303, third ultra - wideband visible / near - infrared polarizer - 304, third quarter - wave plate - 305, polarization state measuring instrument - 401, laser energy meter - 402, polarization - maintaining beam splitting prism - 403, first liquid crystal tunable filter - 404, second beam expander - 405, full - band polarization camera - 501, second liquid crystal tunable filter - 502, fourth quarter - wave plate - 503. Detailed implementation manners

[0013] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0014] Existing research mostly relies on theoretical models and simplified assumptions, lacking systematic verification and experimental data for complex environments. The simulation device can simulate various complex meteorological environments, such as haze, sea fog or high - humidity conditions, and can input the required visibility in real time to obtain the polarized light transmission data of the required visibility, avoiding the interference factors of uncontrollable visibility in the natural environment, and helping to deeply understand the propagation law of polarized light in different media. At the same time, study the influence under different visibilities, verify and optimize the polarization detection model, provide a reliable basis for the design and optimization of optical systems in practical applications, reduce the experimental cost and improve the test efficiency.

[0015] Therefore, for the research on the active and passive polarization transmission characteristics with different visibilities in complex environments, there is an urgent need for a test device and method for simulating the active and passive polarization transmission characteristics with multiple visibilities.

[0016] The objective of this application is to study the testing and verification of polarization transmission characteristics in a complex environment with continuously changing visibility. By analyzing and verifying the results measured by active transmission testing and passive imaging testing in the same environment, and by comparing the transmission losses and scattering characteristics under different polarization states, the consistency between the active transmission and passive imaging results is evaluated.

[0017] To make the above objectives, features, and advantages of this application more obvious and understandable, the following further detailed description of this application is provided in conjunction with the accompanying drawings and specific embodiments.

[0018] In an exemplary embodiment, as Figure 1 shown, a testing device for the active and passive polarization transmission characteristics of simulated multi-visibility is provided, including: an environmental simulation unit 1, an active polarized light emitting unit 2, a passive polarized light emitting unit 3, an active polarized light receiving unit 4, a passive polarized light receiving unit 5, a data analysis unit 9, and a visibility simulation unit 8.

[0019] An optical barrier wall 7 is provided inside the environmental simulation unit 1; based on the optical barrier wall 7, the environmental simulation unit 1 is divided into two parts, obtaining a first part of the environmental simulation unit and a second part of the environmental simulation unit. The environmental simulation unit 1 can be a hemispherical metal box; at the center position of the bottom surface of the hemisphere, an optical barrier wall 7 is provided.

[0020] Above the top surface of the first part of the environmental simulation unit, an active polarized light receiving unit 4 is provided, and below the bottom surface of the first part of the environmental simulation unit, an active polarized light emitting unit 2 is provided. The active polarized light receiving unit 4 is on the outgoing light path of the active polarized light emitting unit 2.

[0021] Both the passive polarized light emitting unit 3 and the passive polarized light receiving unit 5 are provided at the second part of the environmental simulation unit; the passive polarized light receiving unit 5 is on the outgoing light path of the passive polarized light emitting unit 3, and the angle between the outgoing light path of the passive polarized light emitting unit 3 and the incident light path of the passive polarized light receiving unit 5 is 90°; the data analysis unit 9 is respectively connected to the active polarized light receiving unit 4 and the passive polarized light receiving unit 5; the visibility simulation unit 8 is connected to the environmental simulation unit 1.

[0022] The environmental simulation unit 1 is used to provide a set simulation environment; the visibility simulation unit 8 is used to provide particles for the set simulation environment to change the visibility; the active polarized light receiving unit 4 is used to receive the polarized light emitted by the active polarized light emitting unit 2 to obtain polarization data; the passive polarized light receiving unit 5 is used to receive the polarized light emitted by the passive polarized light emitting unit 3 to obtain a polarization image.

[0023] The data analysis unit 9 is used to solve and process the polarization image to obtain the degree of polarization, and perform comparison and analysis based on the polarization data and the degree of polarization to obtain the analysis result; the analysis result is used to characterize the conformity of the active and passive polarization transmissions.

[0024] In one embodiment, the active polarization light emitting unit 2 includes: a multi-wavelength laser 201, a first ultra-wideband visible / near-infrared polarizer 202, a first quarter-wave plate 203, and a first beam expander 204.

[0025] The first ultra-wideband visible / near-infrared polarizer 202 is arranged on the outgoing light path of the multi-wavelength laser 201; the first quarter-wave plate 203 is arranged on the outgoing light path of the first ultra-wideband visible / near-infrared polarizer 202; the first beam expander 204 is arranged on the outgoing light path of the first quarter-wave plate 203.

[0026] The multi-wavelength laser 201 is used to emit laser beams.

[0027] The first ultra-wideband visible / near-infrared polarizer 202 is used to modulate the laser beam to obtain polarized light with different polarization states.

[0028] The first quarter-wave plate 203 is used to modulate the polarized light into circularly polarized light; the first beam expander 204 is used to reduce the beam diameter of the circularly polarized light.

[0029] The active polarization light receiving unit 4 includes: a polarization state measuring instrument 401, a laser energy meter 402, a polarization-maintaining beam splitting prism 403, a first liquid crystal tunable filter 404, and a second beam expander 405.

[0030] The second beam expander 405 is arranged on the outgoing light path of the active polarization light emitting unit 2; the first liquid crystal tunable filter 404 is arranged on the outgoing light path of the second beam expander 405; the polarization-maintaining beam splitting prism 403 is arranged on the outgoing light path of the first liquid crystal tunable filter 404; the laser energy meter 402 is arranged on the outgoing light path of the polarization-maintaining beam splitting prism 403; the polarization state measuring instrument 401 is located on the 90° beam splitting light path of the polarization-maintaining beam splitting prism 403.

[0031] The second beam expander 405 is used to receive the polarized light emitted by the active polarization light emitting unit 2 and perform beam diameter reduction processing to obtain a processed beam.

[0032] The first liquid crystal tunable filter 404 is used to filter the processed beam according to the set wavelength to reduce light source interference.

[0033] The polarization-maintaining beam splitting prism 403 is used to split the beam processed by the first liquid crystal tunable filter 404 into two, obtaining a first beam and a second beam.

[0034] The laser energy meter 402 is used to measure the laser energy of the first beam.

[0035] The polarization state measuring instrument 401 is used to detect the change information of the polarization state and polarization degree of the second beam, and obtain polarization data.

[0036] The passive polarized light emitting unit 3 includes: a full-band halogen lamp 301, a second ultra-wideband visible / near-infrared polarizer 302, a second quarter-wave plate 303, a third ultra-wideband visible / near-infrared polarizer 304, and a third quarter-wave plate 305.

[0037] The second ultra-wideband visible / near-infrared polarizer 302 is arranged on the outgoing light path of the full-band halogen lamp 301; the second quarter-wave plate 303 is arranged on the outgoing light path of the second ultra-wideband visible / near-infrared polarizer 302; the third ultra-wideband visible / near-infrared polarizer 304 is arranged on the outgoing light path of the second quarter-wave plate 303; the third quarter-wave plate 305 is arranged on the outgoing light path of the third ultra-wideband visible / near-infrared polarizer 304.

[0038] The full-band halogen lamp 301 is used to emit a natural light beam; the second ultra-wideband visible / near-infrared polarizer 302 is used to modulate the natural light beam to obtain a first polarized light with different polarization states.

[0039] The second quarter-wave plate 303 is used to modulate the first polarized light into a first circularly polarized light.

[0040] The third ultra-wideband visible / near-infrared polarizer 304 is used to modulate the first circularly polarized light to obtain a second polarized light with different polarization states.

[0041] The third quarter-wave plate 305 is used to modulate the second polarized light into a second circularly polarized light.

[0042] The passive polarized light receiving unit 5 includes: a fourth quarter-wave plate 503, a second liquid crystal tunable filter 502, and a full-band polarization camera 501.

[0043] The fourth quarter-wave plate 503 is arranged on the outgoing light path of the passive polarized light emitting unit 3; the second liquid crystal tunable filter 502 is arranged on the outgoing light path of the fourth quarter-wave plate 503; the full-band polarization camera 501 is arranged on the outgoing light path of the second liquid crystal tunable filter 502.

[0044] The fourth quarter-wave plate 503 is used to modulate the polarized light emitted by the passive polarized light emitting unit 3.

[0045] The second liquid crystal tunable filter 502 is used to filter the light beam modulated by the fourth quarter-wave plate 503 according to the set wavelength.

[0046] The full-band polarization camera 501 is configured to receive the polarization characteristics of reflected and scattered light based on the light beam filtered by the second liquid crystal tunable filter 502, and obtain a polarization image.

[0047] As an optional implementation, the active and passive polarization transmission characteristic test device for simulating multiple visibilities further includes: a gas circulation unit 6.

[0048] The gas circulation unit 6 is disposed inside the environment simulation unit 1, and is located on one side of the optical barrier wall 7 and in the same vertical plane as the optical barrier wall 7.

[0049] The gas circulation unit 6 is used to circulate the environmental gas inside the first part of the environment simulation unit and the second part of the environment simulation unit, so that the environmental concentrations of the first part of the environment simulation unit and the second part of the environment simulation unit are the same.

[0050] In addition, the active and passive polarization transmission characteristic test device for simulating multiple visibilities further includes: a visibility detection unit 12 and a visibility simulation control unit 10.

[0051] The visibility detection unit 12 is disposed on the optical barrier wall 7; the visibility simulation control unit 10 is respectively connected to the visibility detection unit 12, the visibility simulation unit 8, and the active polarization light receiving unit 4.

[0052] The visibility detection unit 12 is used to detect the environmental visibility.

[0053] The visibility simulation control unit 10 is used to control the generation and emission of particles by the visibility simulation unit 8 according to the preset visibility and the detected environmental visibility.

[0054] In one embodiment, a first optical window is provided on the bottom surface of the first part of the environment simulation unit, and the first optical window is disposed on the outgoing light path of the active polarization light emitting unit 2; a third optical window is provided on the top surface of the first part of the environment simulation unit, and the third optical window is disposed on the outgoing light path of the first optical window; the active polarization light receiving unit 4 is on the outgoing light path of the third optical window.

[0055] A fourth optical window and a fifth optical window are provided on the second part of the environment simulation unit; a second optical window is provided on the bottom surface of the second part of the environment simulation unit.

[0056] The fourth optical window is disposed on the outgoing light path of the passive polarization light emitting unit 3; the second optical window is disposed on the outgoing light path of the fourth optical window and is also disposed on the incident light path of the fifth optical window; the passive polarization light receiving unit 5 is disposed on the outgoing light path of the fifth optical window.

[0057] Specifically, in practical applications, such asFigure 1 As shown in Figure 1 , the environmental simulation unit 1 is a hemispherical metal box. An optical barrier wall 7 is arranged at the central position, dividing the entire environmental simulation unit 1 into two parts. One part is the active polarized light emission and reception test environment device, that is, the first part of the environmental simulation unit, and the other part is the passive polarized light emission and reception test environment device, that is, the second part of the environmental simulation unit. The environment simulated by the environmental simulation unit 1 is an atmospheric dust / haze environment or a sea fog environment.

[0058] Optical glass windows are opened at the top and bottom of the environmental simulation unit 1. Specifically, at the bottom and top of the first part of the environmental simulation unit, there are a first optical window and a third optical window respectively. That is, a first optical window is arranged on the bottom surface of the first part of the environmental simulation unit, and a third optical window is arranged on the top of the first part of the environmental simulation unit. Both the first optical window and the third optical window can be circular optical glass windows. The polarized light emitted by the active polarized light emission unit 2 enters through the first optical window and exits through the third optical window.

[0059] A second optical window is opened on the bottom surface of the second part of the environmental simulation unit; this second optical window can adopt a square optical glass window.

[0060] A fourth optical window and a fifth optical window with a light propagation included angle of 90 degrees are opened at the top of the second part of the environmental simulation unit. Both the fourth optical window and the fifth optical window can adopt circular optical glass windows.

[0061] The polarized light emitted by the passive polarized light emission unit 3 enters through the fourth optical window, passes through the target placed at the second optical window, and then exits through the fifth optical window. Figure 2 It is a top view of the environmental simulation unit.

[0062] The active polarized light emission unit 2 includes: a multi-wavelength laser 201, a first ultra-wideband visible / near-infrared light polarizer 202, a first quarter-wave plate 203, and a first beam expander 204.

[0063] The multi-wavelength laser 201, the first ultra-wideband visible / near-infrared light polarizer 202, the first quarter-wave plate 203, and the first beam expander 204 are coaxial and arranged in sequence along the light propagation direction.

[0064] The laser beam is emitted by the multi-wavelength laser 201 and sequentially passes through the first ultra-wideband visible / near-infrared light polarizer 202, the first quarter-wave plate 203, and the first beam expander 204, and then reaches the active polarized light reception unit 4 through the first part of the environmental simulation unit.

[0065] The multi-wavelength laser 201 generates laser beams in the required wavelength bands; the multi-wavelength laser 201 uses a standard RGB series multi-wavelength laser system.

[0066] The first ultra-wideband visible / near-infrared polarizer 202 modulates the laser beam into polarized light of different polarization states; the first ultra-wideband visible / near-infrared polarizer 202 uses the Bolder Vision Optik Inc - BVO 1000 ultra-wideband visible / near-infrared polarizer 400nm–1600nm.

[0067] The first quarter-wave plate 203 modulates the polarized light into circularly polarized light; the first beam expander 204 reduces the beam diameter of the circularly polarized light.

[0068] The active polarized light receiving unit 4 includes: a polarization state measuring instrument 401, a laser energy meter 402, a polarization-maintaining beam splitter prism 403, a first liquid crystal tunable filter 404, and a second beam expander 405.

[0069] The laser energy meter 402, the polarization-maintaining beam splitter prism 403, the first liquid crystal tunable filter 404, and the second beam expander 405 are coaxial and arranged in sequence along the light propagation direction, and the polarization state measuring instrument 401 is located on the 90° splitting optical path of the polarization-maintaining beam splitter prism 403.

[0070] The polarized light emitted by the active polarized light emitting unit 2 exits from the first part of the environmental simulation unit and reaches the second beam expander 405, then to the polarization-maintaining beam splitter prism 403. The polarization-maintaining beam splitter prism 403 divides the polarized light beam into two beams with the same energy, obtaining a first beam and a second beam. That is, one beam reaches the polarization state measuring instrument 401, and the other beam reaches the laser energy meter 402.

[0071] The polarization state measuring instrument 401 detects the change information of the polarization state and polarization degree of the second beam to obtain polarization data; the polarization state measuring instrument 401 is a Thorlabs PAX1000 series polarization measuring instrument.

[0072] The laser energy meter 402 observes the change of laser energy; the laser energy meter 402 uses a MACH 6 ultrafast laser energy meter.

[0073] The polarization-maintaining beam splitter prism 403 divides the beam processed by the first liquid crystal tunable filter 404 into two. The second beam expander 405 is used to receive the polarized light emitted by the active polarized light emitting unit 2 and perform beam diameter reduction processing to obtain a processed beam. The first liquid crystal tunable filter 404 only allows light of the required wavelength to pass through, that is, filters the processed beam according to the set wavelength to reduce the interference of other light sources.

[0074] The passive polarized light emitting unit 3 includes: a full-band halogen lamp 301, a second ultra-wideband visible / near-infrared polarizer 302, a second quarter-wave plate 303, a third ultra-wideband visible / near-infrared polarizer 304, and a third quarter-wave plate 305.

[0075] The full-band halogen lamp 301, the second ultra-wideband visible / near-infrared polarizer 302, the second quarter-wave plate 303, the third ultra-wideband visible / near-infrared polarizer 304, and the third quarter-wave plate 305 are coaxial and arranged in sequence along the light propagation direction. The full-band halogen lamp 301 uses a halogen lamp of the MYHA150-VR model.

[0076] The simulated natural light beam is emitted by the full-band halogen lamp 301, passes through the second ultra-wideband visible / near-infrared polarizer 302, the second quarter-wave plate 303, the third ultra-wideband visible / near-infrared polarizer 304, the third quarter-wave plate 305 in sequence, and then reaches the target at the second optical window through the second part of the environmental simulation unit.

[0077] The full-band halogen lamp 301 is a light source that simulates the natural light band and emits a natural light beam; the second ultra-wideband visible / near-infrared polarizer 302, the second quarter-wave plate 303, the third ultra-wideband visible / near-infrared polarizer 304, and the third quarter-wave plate 305 are for generating stable polarized light.

[0078] The passive polarized light receiving unit 5 includes a fourth quarter-wave plate 503, a second liquid crystal tunable filter 502, and a full-band polarization camera 501. The full-band polarization camera 501 uses a full-band polarization camera of the SZ-FUSC500MF model.

[0079] The fourth quarter-wave plate 503, the second liquid crystal tunable filter 502, and the full-band polarization camera 501 are coaxial and arranged in sequence along the light propagation direction; the light reflected and scattered by the target at the second optical window reaches the fourth quarter-wave plate 503, the second liquid crystal tunable filter 502, and the full-band polarization camera 501 through the second part of the environmental simulation unit.

[0080] The fourth quarter-wave plate 503 is for making the received polarized light more stable; the second liquid crystal tunable filter 502 only allows light of the required wavelength to pass through, which is for reducing the interference of other light and receiving the light beam of the target band; the full-band polarization camera 501 is for receiving the polarization characteristics of the reflected and scattered target object to obtain a polarization image.

[0081] The gas circulation unit 6 is placed on the left side of the optical barrier wall 7; its function is to circulate the environmental gas in the first part and the second part of the environmental simulation unit, ensuring that the simulated environmental concentration is consistent. The gas circulation unit 6 is an RV 2.2320 / 32 device.

[0082] The environmental particle generation and emission system, namely the visibility simulation unit 8, is placed on one side of the environmental simulation unit 1, at the same horizontal line position as the optical barrier wall 7, and is connected to the environmental simulation unit 1. The visibility simulation unit 8 generates atmospheric soot / haze particles or sea fog particles to simulate the particles in the required environment. At the same time, when converting from low visibility to high visibility, it emits the particles to reduce the particle concentration. The environmental particle generation and emission system, namely the visibility simulation unit 8, adopts an SDL1006 online particulate matter quality control system (standard particle generator).

[0083] The visibility detection unit 12 is placed on the optical barrier wall 7; the purpose of the visibility detection unit 12 is to detect the change of the environmental concentration and obtain the environmental visibility. And it is also compared with the visibility obtained by the laser energy meter 402. The visibility detection unit 12 adopts a PWD series sensor of Vaisala.

[0084] The data analysis unit 9 is electrically connected to the polarization state measuring instrument 401 and the full-band polarization camera 501.

[0085] The data analysis unit 9 processes the polarization images obtained by the full-band polarization camera 501 and compares and calculates them with the polarization data obtained by the polarization state measuring instrument 401. The data analysis unit 9 is a YE6270 data analysis unit.

[0086] The visibility simulation control unit 10 is electrically connected to the laser energy meter 402, the visibility detection unit 12, and the visibility simulation unit 8. The visibility simulation control unit 10 adopts a TH-NJD10 visibility monitoring system.

[0087] The visibility simulation control unit 10 is used to control the visibility of the generated atmospheric soot / haze or sea fog environment to be the required visibility, and synchronously control the visibility simulation unit 8 to generate atmospheric soot / haze particles or sea fog particles, or emit the particles to improve the visibility according to the reading of the visibility detection unit 12.

[0088] The active polarized light emission unit 2, the passive polarized light emission unit 3, the visibility simulation control unit 10, and the data analysis unit 9 are electrically connected to the system overall control center 11.

[0089] This application systematically studies the transmission characteristics of both active and passive polarized light simultaneously in a controlled simulation environment. It can not only accurately evaluate the influence of particle scattering such as smoke and sea fog on the degree of polarization and light intensity, but also comparatively analyze the detection effects and signal attenuation laws of the two types of polarized light. Through experiments, data integration and summary are carried out, providing a certain theoretical basis for outdoor experiments and saving time for outdoor experiments. At the same time, it provides a basis and technical support for applications in the fields of military reconnaissance, marine navigation, environmental monitoring, and remote sensing.

[0090] In an exemplary embodiment, a method for testing the transmission characteristics of active and passive polarization with simulated multiple visibilities is provided, and this method is implemented using a testing device for the transmission characteristics of active and passive polarization with simulated multiple visibilities.

[0091] As Figure 3 shown, the method for testing the transmission characteristics of active and passive polarization with simulated multiple visibilities includes: Step 100: Obtain polarization data and polarization images. The polarization data is detected by an active polarization light receiving unit based on the polarized light emitted by an active polarization light emitting unit under a set simulation environment and visibility; the polarization image is obtained by a passive polarization light receiving unit receiving the polarization characteristics of reflection and scattering based on the polarized light emitted by a passive polarization light emitting unit under a set simulation environment and visibility.

[0092] Step 200: Perform resolution processing on the polarization image to obtain the degree of polarization.

[0093] Step 300: Conduct comparative analysis based on the polarization data and the degree of polarization to obtain an analysis result. The analysis result is used to characterize the conformity of active and passive polarization transmission.

[0094] Performing resolution processing on the polarization image to obtain the degree of polarization specifically includes: Convert the polarization image into a grayscale value image.

[0095] Calculate the polarization intensity and the total light intensity based on the grayscale value image; the calculation formula for the polarization intensity is: .

[0096] The calculation formula for the total light intensity is: .

[0097] Calculate the degree of polarization based on the polarization intensity and the total light intensity; the calculation formula for the degree of polarization is: .

[0098] Wherein, is the polarization intensity; is the total light intensity; is the grayscale value image of the polarization component in the 0° direction; is the gray value image of the polarization component in the 45° direction; is the gray value image of the polarization component in the 90° direction; is the gray value image of the polarization component in the 135° direction; is the degree of polarization; is the pixel point coordinates in the gray value image.

[0099] As Figure 4 shown, the specific operation steps are as follows: Step 1: First, open the system's overall control center and send electrical signals to the active polarization light emitting unit and the passive polarization light emitting unit respectively; the active polarization light emitting unit turns on the multi-wavelength laser to emit laser light, and the passive polarization light emitting unit turns on the full-band halogen lamp to emit light source.

[0100] Step 2: The laser beam emitted by the multi-wavelength laser in the active polarization light emitting unit is modulated into the required linearly polarized light by the first ultra-wideband visible / near-infrared polarizer; first, calibrate the scale of the first ultra-wideband visible / near-infrared polarizer to ensure precise control of the subsequent polarization state; rotate the first ultra-wideband visible / near-infrared polarizer to modulate polarized light of different polarization states; then modulate it into circularly polarized light through the first quarter-wave plate, and rotate the first quarter-wave plate to modulate it into left-handed or right-handed polarized light; remove the first quarter-wave plate when linearly polarized light is needed; the laser beam passes through the first beam expander, and the beam is reduced in size by rotating and modulating the first beam expander until the required beam diameter is reached, while ensuring that the optical axis of the first beam expander is consistent with the laser beam to reduce spot distortion and energy loss, and then enters the first part of the environmental simulation unit through the first optical window at the bottom of the first part of the environmental simulation unit.

[0101] Step 3: Turn on the full-band halogen lamp to simulate the light source in the natural light band. The unpolarized light is converted into polarized light by the second ultra-wideband visible / near-infrared polarizer, and then modulated into circularly polarized light through the second quarter-wave plate. Then, when passing through the third ultra-wideband visible / near-infrared polarizer, only the polarized light parallel to its optical axis can pass through, which can precisely control the polarization state and phase of the light and modulate it into linearly polarized light. Rotate the third ultra-wideband visible / near-infrared polarizer to modulate polarized light of different polarization states, and then calibrate the scale of the third ultra-wideband visible / near-infrared polarizer; then modulate it into circularly polarized light through the third quarter-wave plate, and rotate the third quarter-wave plate to modulate it into left-handed or right-handed polarized light; remove the third quarter-wave plate when linearly polarized light is needed; then enter the second part of the environmental simulation unit through the fourth optical window and finally reach the target.

[0102] Step 4: The polarized light emitted by the active polarized light emitting unit reaches the active polarized light receiving unit. Then, the beam diameter is reduced by the second beam expander. Next, the stray light is removed by the first liquid crystal tunable filter corresponding to the relevant wavelength band. The light is split into two by a polarization-maintaining beam splitter. One beam leads to a polarization state measuring instrument to record the polarization state (0, 45, 90, 135, left-handed, right-handed) and the polarization degree information of the laser at this time; the other beam leads to an optical energy meter, that is, a laser energy meter, to record the initial energy of the optical energy meter and observe and record the numerical change of the optical energy meter.

[0103] Step 5: Turn on the environmental particle generator (i.e., the visibility simulation unit) to generate smoke / haze particles or sea fog particles. At the same time, turn on the gas circulation device, that is, the gas circulation unit, to fill the first part and the second part of the environmental simulation unit with uniform environmental particles, so that the visibility environments of the two are kept consistent.

[0104] Step 6: When the visibility simulation control unit calculates the required visibility based on the initial energy of the optical energy meter (i.e., the laser energy meter) and calculates the final required energy value; turn on the visibility detection unit to record the visibility value and transmit the recorded data to the visibility simulation control unit. Compare the calculated visibility with the visibility obtained by the visibility meter (visibility detection unit) to ensure the accuracy of the simulated visibility. At the same time, after the visibility simulation control unit reaches the required simulated visibility, it sends a signal to the visibility simulation unit to stop injecting particles into the environmental simulation unit; at the same time, when converting from a low visibility environment to a high visibility environment, remove the particles in the environmental simulation unit to reduce the particle concentration.

[0105] The derivation process of the change of the optical energy meter when calculating the simulated visibility is as follows: Visibility V refers to the propagation distance when the target contrast decays to the human eye visual threshold.

[0106] .

[0107] .

[0108] Among them: C is the contrast threshold, usually taking a value of 0.02 or 0.05; C0 is the initial contrast; is the atmospheric extinction coefficient, with the unit .

[0109] According to the definition of optical thickness, the optical thickness and the light transmittance are related: .

[0110] Among them, ; is the optical thickness; L is the propagation distance; I is the incident light intensity, I 0 is the received light intensity.

[0111] .

[0112] can be expressed as: is expressed as: .

[0113] Substitute into the visibility formula , and eliminate , to obtain: .

[0114] The propagation distance of the experiment L = 2m or L = 2.5m (the height of the box is generally 2m / 2.5m); the initial contrast C 0 is usually taken as 1, that is, completely visible.

[0115] Specifically, calculate the atmospheric extinction coefficient: ; calculate the visibility: ; where C0 = 1, so it is simplified to: .

[0116] Step 7: After the full-band halogen lamp passes through the second part of the environmental simulation unit, the light reflected or scattered after irradiating the target reaches the fourth quarter-wave plate. The fourth quarter-wave plate makes the polarization state of the received polarized light more stable, and then selects the second liquid crystal tunable filter corresponding to the band to eliminate stray light. Then, the full-band polarization camera obtains the polarization information of the target in the images of the four polarization components of 0, 45, 90, and 135 to obtain the polarization image. And the polarization image is transmitted to the data analysis unit for calculation and processing to calculate the degree of polarization.

[0117] Among them, the calculation process of the degree of polarization: Convert the obtained polarization image into a grayscale value image, where the polarization image includes: , , , , and the value of each pixel point of them represents the light intensity at that position.

[0118] : Grayscale value image of the polarization component in the 0° direction; : Grayscale value image of the polarization component in the 45° direction; : Grayscale value image of the polarization component in the 90° direction; : Grayscale value image of the polarization component in the 135° direction.

[0119] For the pixel coordinates in the grayscale value image , calculate the polarization intensity and the total light intensity respectively.

[0120] Polarization intensity : .

[0121] Total light intensity : .

[0122] Degree of polarization The value corresponding to each pixel point: .

[0123] Thus, the numerical value of the passive polarization transmission characteristic is calculated.

[0124] Step 8: The data analysis unit calculates the degree of polarization of the passive polarization imaging, that is, the polarization image obtained by the full-band polarization camera, and then compares it with the data measured by the active polarization transmission, namely the polarization data, to analyze the differences in the active and passive polarization transmission characteristics.

[0125] Compare whether the trends of the degree of polarization are consistent under different polarization states (0°, 45°, 90°, 135°, left-handed, right-handed) of active and passive polarization. Construct a polarization state - degree of polarization comparison table (each group contains six polarization states) for the degree of polarization data obtained under the six polarization states, and draw curve graphs (one for active polarization and one for passive polarization) respectively.

[0126] Compare whether the shapes of the two curves are similar, that is, whether they have the same variation law (such as rising or falling synchronously, consistent peaks and valleys, etc.).

[0127] By calculating the deviation between active polarization and passive polarization, first assign polarization degrees to the recorded active polarization and passive polarization degree values.

[0128] Degree of polarization value of active polarization: .

[0129] Degree of polarization value of passive polarization: .

[0130] Among them, is the degree of polarization value of active polarization; is the degree of polarization value of passive polarization; is the i th measurement or the i th sample corresponding active polarization degree value; is the degree of polarization measured under the i th active transmission; is the passive polarization degree value corresponding to the i th measurement or the i th sample; is the degree of polarization measured under the i th passive state. i is the serial number.

[0131] Analyze whether the degree of polarization value of active polarization A and the degree of polarization value of passive polarization B meet the consistency, which is carried out from the following three processes respectively.

[0132] Process 1. Linear correlation: Linear relationship fitting - regression model + goodness of fit .

[0133] .

[0134] Among them, is the regression slope, and the ideal value is 1; is the intercept, and the ideal value is 0; is the residual term, and the smaller the better.

[0135] The expression of the goodness of fit (coefficient of determination) is: .

[0136] Among them, is the predicted value of the i th observation; is the average value of the actual values of all observations. n is the total number of samples.

[0137] If , it indicates that the trends of the two groups of data are highly consistent.

[0138] Process 2. Error magnitude: Error amplitude analysis - RMSE measures the error magnitude from the perspective of the sum of squared residuals. It can be defined using fitting or direct difference: Error term : .

[0139] Then, .

[0140] RMSE Essentially, it is the root mean square of the squared loss function, used to quantify the average deviation degree between the two.

[0141] Process 3. Difference consistency distribution - Bland - Altman difference and mean analysis.

[0142] Difference : 。

[0143] Average value : 。

[0144] When plotting the curve graph, is the vertical axis of the coordinate axis; is the horizontal axis of the coordinate axis.

[0145] Average value of the difference : 。

[0146] Standard deviation of the difference : 。

[0147] Among them, the consistency interval is 。

[0148] If 95% of the falls into this interval, then there is no obvious systematic deviation between the active polarization and the passive polarization, and it is considered to have statistical consistency.

[0149] That is: from trend consistency → deviation intensity → systematic error, verify layer by layer whether the observation results of the two polarization systems are consistent under the same environment to ensure that the conclusion has statistical reliability and explanatory power.

[0150] Table 1 Active polarization degree value table

[0151] Table 2 Passive polarization degree value table

[0152] The polarization state - polarization degree curve graph drawn from the data in Table 1 and Table 2 is as Figure 5 shown. The specific processing process is as follows: According to the calculation formula in the above process one, the fitting function result can be calculated , indicating that the fitting error is very small.

[0153] According to the calculation process of the above process two, the first item: , and so on. Square the differences of the 6 polarization states, sum them up, take the average and then take the square root. The result is: , indicating that on average each point deviates from 9 polarization degree units.

[0154] According to the calculation process of the above process three, the difference , {9.41, 9.58, 9.56, 8.85, 8.56, 8.03}; Mean value , {69.00, 70.93, 70.29, 71.53, 78.50, 78.71}; Average of differences: ; Standard deviation of differences: .

[0155] Among them, the consistency interval is: Upper limit = ; Lower limit = .

[0156] All differences , completely fall within the consistency interval, indicating that the error is stable and there are no deviation points.

[0157] Based on the comprehensive analysis of the data of active polarization and passive polarization degree under six polarization states, the results show a high degree of consistency between the two: the determination coefficient reaches a value close to 1, indicating that the changing trends of the two groups of data are basically synchronous; the root mean square error (RMSE) is about 9, reflecting an average deviation of about 9 units in the measured values of the two systems, but this error level is within an acceptable range; and the Bland-Altman analysis shows that the differences between the two systems all fall within the range of 7.77 to 10.23, without obvious systematic deviation. Generally speaking, although the active system is slightly higher than the passive system, its polarization transmission characteristics are consistent and reliable in practical applications.

[0158] The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope recorded in this specification.

[0159] Specific examples are used in this article to elaborate on the principles and implementation manners of this application. The description of the above embodiments is only used to help understand the method and its core idea of this application; at the same time, for those of ordinary skill in the art, according to the idea of this application, there will be changes in the specific implementation manners and application scopes. In summary, the content of this specification should not be construed as a limitation to this application.

Claims

1. A test device for active and passive polarization transmission characteristics simulating multiple visibility, characterized in that: include: An environment simulation unit, an active polarized light transmitting unit, a passive polarized light transmitting unit, an active polarized light receiving unit, a passive polarized light receiving unit, a data analysis unit, and a visibility simulation unit; An optical barrier wall is provided in the environmental simulation unit; Taking the optical barrier wall as a reference, the environmental simulation unit is divided into two parts, so as to obtain a first environmental simulation unit and a second environmental simulation unit; An active polarized light receiving unit is disposed above the top surface of the first part of the environment simulation unit, and an active polarized light emitting unit is disposed below the bottom surface of the first part of the environment simulation unit, and the active polarized light receiving unit is located on the outgoing light path of the active polarized light emitting unit; The passive polarized light transmitting unit and the passive polarized light receiving unit are both arranged at the second part of the environment simulation unit; The passive polarized light receiving unit is arranged on the outgoing light path of the passive polarized light transmitting unit, and the angle between the outgoing light path of the passive polarized light transmitting unit and the incident light path of the passive polarized light receiving unit is 90°; the data analysis unit is respectively connected to the active polarized light receiving unit and the passive polarized light receiving unit; the visibility simulation unit is connected to the environment simulation unit; The environment simulation unit is used to provide a set simulation environment; the visibility simulation unit is used to provide particles for setting the simulation environment to change visibility; the active polarized light receiving unit is used to receive polarized light emitted by the active polarized light emitting unit to obtain polarization data; The passive polarized light receiving unit is used to receive the polarized light emitted by the passive polarized light emitting unit to obtain a polarized image; The data analysis unit is used to solve the polarization image to obtain the polarization degree, and compare and analyze the polarization data and the polarization degree to obtain the analysis result; the analysis result is used to characterize the consistency of active and passive polarization transmission.

2. The active and passive polarization transmission characteristics testing device for simulating multiple visibility according to claim 1, characterized in that: The active polarized light emitting unit comprises: a multi-wavelength laser, a first ultra-wideband visible / near infrared polarizer, a first quarter-wave plate and a first beam reducer; The first ultra-wideband visible / near-infrared polarizer is arranged on the outgoing light path of the multi-wavelength laser; the first quarter-wave plate is arranged on the outgoing light path of the first ultra-wideband visible / near-infrared polarizer; the first beam reducer is arranged on the outgoing light path of the first quarter-wave plate; A multi-wavelength laser is used to emit laser beams; The first ultra-wideband visible / near infrared polarizer is used to modulate the laser beam to obtain polarized light with different polarization states; The first quarter wave plate is used to modulate the polarized light into circularly polarized light; The first beam reducer is used to reduce the diameter of the circularly polarized light beam.

3. The active and passive polarization transmission characteristics testing device for simulating multiple visibility according to claim 1, characterized in that: The active polarized light receiving unit comprises: a polarization state measuring instrument, a laser energy meter, a polarization-maintaining beam splitter prism, a first liquid crystal tunable filter and a second beam reducer; The second beam reducer is arranged on the outgoing light path of the active polarized light emitting unit; the first liquid crystal tunable filter is arranged on the outgoing light path of the second beam reducer; the polarization-maintaining beam splitter prism is arranged on the outgoing light path of the first liquid crystal tunable filter; the laser energy meter is arranged on the outgoing light path of the polarization-maintaining beam splitter prism; and the polarization state measuring instrument is located on the 90° beam splitting path of the polarization-maintaining beam splitter prism; The second beam reducer is used to receive the polarized light emitted by the active polarized light emitting unit and perform beam reduction processing on the beam diameter to obtain a processed beam; The first liquid crystal tunable filter is used to filter the processed light beam according to the set wavelength to reduce light source interference; The polarization-maintaining beam splitter prism is used to split the light beam processed by the first liquid crystal tunable filter into two, thereby obtaining a first light beam and a second light beam; The laser energy meter is used to measure the laser energy of the first light beam; The polarization state measuring instrument is used to detect the change information of the polarization state and polarization degree of the second light beam to obtain polarization data.

4. The active and passive polarization transmission characteristics testing device for simulating multiple visibility according to claim 1, characterized in that: The passive polarized light emitting unit includes: a full-band halogen lamp, a second ultra-wideband visible / near-infrared polarizer, a second quarter-wave plate, a third ultra-wideband visible / near-infrared polarizer, and a third quarter-wave plate; The second ultra-wideband visible / near-infrared polarizer is arranged on the outgoing light path of the full-band halogen lamp; the second quarter-wave plate is arranged on the outgoing light path of the second ultra-wideband visible / near-infrared polarizer; the third ultra-wideband visible / near-infrared polarizer is arranged on the outgoing light path of the second quarter-wave plate; the third quarter-wave plate is arranged on the outgoing light path of the third ultra-wideband visible / near-infrared polarizer; Full-band halogen lamps are used to emit natural light beams; The second ultra-wideband visible / near infrared polarizer is used for modulating the natural light beam to obtain the first polarized light with different polarization states; The second quarter wave plate is used for modulating the first polarized light into a first circularly polarized light; The third ultra-wideband visible / near infrared polarizer is used to modulate the first circularly polarized light to obtain a second polarized light with a different polarization state; The third quarter wave plate is used for modulating the second polarized light into second circularly polarized light.

5. The active and passive polarization transmission characteristics testing device for simulating multiple visibility according to claim 1, characterized in that: The passive polarized light receiving unit includes: a fourth quarter wave plate, a second liquid crystal tunable filter and a full-band polarization camera; The fourth quarter wave plate is arranged on the outgoing light path of the passive polarized light emitting unit; the second liquid crystal tunable filter is arranged on the outgoing light path of the fourth quarter wave plate; and the full-band polarization camera is arranged on the outgoing light path of the second liquid crystal tunable filter; The fourth quarter wave plate is used to modulate the polarized light emitted by the passive polarized light emitting unit; The second liquid crystal tunable filter is used to filter the light beam modulated by the fourth quarter wave plate according to a set wavelength; The full-band polarization camera is used for receiving the polarization characteristics of reflection and scattering according to the light beam filtered by the second liquid crystal tunable filter to obtain a polarization image.

6. The active and passive polarization transmission characteristics testing device for simulating multiple visibility according to claim 1, characterized in that: Also includes: Gas circulation unit; The gas circulation unit is arranged in the environment simulation unit and is located on one side of the optical barrier wall and is in the same vertical plane as the optical barrier wall; The gas circulation unit is used for circulating the environmental gas in the first environmental simulation unit and the second environmental simulation unit so as to make the environmental concentrations in the first environmental simulation unit and the second environmental simulation unit the same.

7. The active and passive polarization transmission characteristics testing device for simulating multiple visibility according to claim 1, characterized in that: Also includes: Visibility detection unit and visibility simulation control unit; The visibility detection unit is arranged on the optical barrier wall; the visibility simulation control unit is respectively connected with the visibility detection unit, the visibility simulation unit and the active polarized light receiving unit; The visibility detection unit is used to detect the environmental visibility; The visibility simulation control unit is used to control the visibility simulation unit to generate and emit particles according to the preset visibility and the detected environmental visibility.

8. The active and passive polarization transmission characteristics testing device for simulating multiple visibility according to claim 1, characterized in that: A first optical window is arranged on the bottom surface of the first partial environment simulation unit, and the first optical window is arranged on the outgoing light path of the active polarized light emitting unit; a third optical window is arranged on the top surface of the first partial environment simulation unit, and the third optical window is arranged on the outgoing light path of the first optical window; the active polarized light receiving unit is on the outgoing light path of the third optical window; The second part of the environmental simulation unit is provided with a fourth optical window and a fifth optical window; the second part of the environmental simulation unit is provided with a second optical window on the bottom surface; The fourth optical window is arranged on the outgoing light path of the passive polarized light emitting unit; The second optical window is arranged on the exit light path of the fourth optical window, and the second optical window is arranged on the incident light path of the fifth optical window; The passive polarized light receiving unit is arranged on the outgoing light path of the fifth optical window.

9. A method for testing active and passive polarization transmission characteristics simulating multiple visibility, characterized in that: The method is implemented by using the active and passive polarization transmission characteristics test device for simulating multiple visibility as described in any one of claims 1 to 8; the active and passive polarization transmission characteristics test method for simulating multiple visibility comprises: Obtain polarization data and polarization images; the polarization data is obtained by detecting the polarized light emitted by the active polarization light emitting unit under the set simulation environment and visibility using the active polarization light receiving unit; the polarization image is obtained by receiving the polarization characteristics of reflection and scattering by the passive polarization light receiving unit under the set simulation environment and visibility based on the polarized light emitted by the passive polarization light emitting unit; Performing a calculation on the polarization image to obtain a degree of polarization; A comparison and analysis is performed based on the polarization data and the polarization degree to obtain an analysis result; the analysis result is used to characterize the consistency of active and passive polarization transmission.

10. The method for testing active and passive polarization transmission characteristics simulating multiple visibility according to claim 9, characterized in that: The polarization image is subjected to a calculation process to obtain a degree of polarization, specifically comprising: Converting the polarization image into a grayscale image; The polarization intensity and the total light intensity are calculated based on the gray value image; the calculation formula of the polarization intensity is: ； The calculation formula of the total light intensity is: ； The degree of polarization is calculated according to the polarization intensity and the total light intensity; the calculation formula of the degree of polarization is: ； in, is the polarization intensity; is the total light intensity; It is the gray value image of the polarization component in the 0° direction; It is the gray value image of the polarization component in the 45° direction; It is the gray value image of the polarization component in the 90° direction; It is the gray value image of the polarization component in the 135° direction; is the degree of polarization; is the pixel coordinates in the grayscale image.

Images