Active and passive polarization transmission characteristics testing device and method for simulating multiple visibility

Abstract

The present application discloses a device and method for testing active and passive polarization transmission characteristics in simulated multiple visibility conditions, and relates to the field of polarization transmission detection. A simulated environment is provided by an environmental simulation unit; a visibility simulation unit provides particles for the simulated environment to change visibility; an active polarized light receiving unit receives polarized light emitted by an active polarized light emitting unit to obtain polarization data; a passive polarized light receiving unit receives polarized light emitted by a passive polarized light emitting unit to obtain a polarization image; a data analysis unit processes the polarization image to obtain the degree of polarization, and compares and analyzes the polarization data and the degree of polarization to obtain an analysis result; the analysis result is used to characterize the consistency of active and passive polarization transmission. The present application can realize the testing and analysis of active and passive polarization transmission characteristics under different visibilities.

Description

Technical Field

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

[0002] The transmission characteristics of polarized light are affected by suspended particles, aerosols, and atmospheric molecules in the atmosphere. Visibility is a key indicator of the concentration of suspended particles in the atmosphere. In environments with low visibility, such as haze or high humidity, particulate matter such as water droplets, aerosols, and dust in the air can increase the scattering and absorption of light, thereby changing the polarization state of light.

[0003] Currently, research on the transmission characteristics of polarized light primarily focuses on its propagation behavior under various atmospheric conditions, particularly in low-visibility environments such as haze. While some progress has been made in fields such as active polarization transmission, remote sensing, and aerospace, many uncertainties remain regarding the transmission characteristics of polarized light under complex meteorological conditions, particularly in marine and urban environments.

[0004] These changes affect the performance of polarization detection systems, especially in low-visibility conditions, where the light propagation path 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 enhancing transmission models in atmospheric environments. Summary of the Invention

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

[0006] To achieve the above objectives, this application provides the following solutions:

[0007] In a first aspect, the present application provides an active and passive polarization transmission characteristic test device for simulating multiple visibilities, comprising: 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;

[0008] An optical barrier wall is provided in the environmental simulation unit; the environmental simulation unit is divided into two parts based on the optical barrier wall, thereby obtaining a first environmental simulation unit and a second environmental simulation unit;

[0009] An active polarized light receiving unit is provided above the top surface of the first environmental simulation unit, and an active polarized light emitting unit is provided below the bottom surface of the first environmental simulation unit. The active polarized light receiving unit is located on the outgoing light path of the active polarized light emitting unit.

[0010] The passive polarized light emitting 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 emitting unit, and the angle between the outgoing light path of the passive polarized light emitting unit and the incident light path of the passive polarized light receiving unit is 90°; the data analysis unit is connected to the active polarized light receiving unit and the passive polarized light receiving unit respectively; the visibility simulation unit is connected to the environment simulation unit;

[0011] The environment 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 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 polarized light emitted by the passive polarized light emitting unit to obtain a polarization image;

[0012] 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 an analysis result; the analysis result is used to characterize the consistency of active and passive polarization transmission.

[0013] In a second aspect, the present application provides a method for testing active and passive polarization transmission characteristics in simulated multi-visibility, which is implemented using an active and passive polarization transmission characteristics testing device in simulated multi-visibility. The method for testing active and passive polarization transmission characteristics in simulated multi-visibility includes:

[0014] Obtain polarization data and a polarization image; the polarization data is obtained by detecting polarized light emitted by an active polarization light emitting unit using an active polarization light receiving unit under a set simulated environment and visibility; the polarization image is obtained by detecting polarization characteristics of reflection and scattering of polarized light emitted by a passive polarization light emitting unit using a passive polarization light receiving unit under a set simulated environment and visibility;

[0015] performing a calculation on the polarization image to obtain a degree of polarization;

[0016] 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.

[0017] Optionally, performing a calculation on the polarization image to obtain the degree of polarization specifically includes:

[0018] Converting the polarization image into a grayscale image;

[0019] The polarization intensity and the total light intensity are calculated based on the grayscale image; the calculation formula of the polarization intensity is:

[0020] ;

[0021] The calculation formula of the total light intensity is:

[0022] ;

[0023] 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:

[0024] ;

[0025] 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 coordinate in the grayscale image.

[0026] According to the specific embodiments provided in this application, this application discloses the following technical effects:

[0027] The present application provides a device and method for testing active and passive polarization transmission characteristics that simulate multiple visibilities. The device provides a set simulation environment through an environmental simulation unit, and provides particles of the set simulation environment through a visibility simulation unit to change visibility. The active polarized light receiving unit then receives polarized light emitted by the active polarized light emitting unit to obtain polarization data. The passive polarized light receiving unit receives polarized light emitted by the passive polarized light emitting unit to obtain a polarization image. The data analysis unit is used to solve and process the polarization image to obtain the degree of polarization, and a comparison and analysis is performed based on the polarization data and the degree of polarization to obtain an analysis result to characterize the consistency of the active and passive polarization transmission. The present application constructs environments of different visibilities based on the environmental simulation unit and the visibility simulation unit, and then processes and compares the information under active polarization and passive polarization, i.e., the polarization data and the polarization image, to determine the consistency of the active and passive polarization transmission, so as to realize the testing and analysis of the active and passive polarization transmission characteristics under different visibilities. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. 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 creative work.

[0029] Figure 1 This is a schematic diagram of the overall structure of the active and passive polarization transmission characteristics test device simulating multiple visibility;

[0030] Figure 2 This is a top view of the environmental simulation unit;

[0031] Figure 3 Flowchart of the active and passive polarization transmission characteristics test method for simulating multiple visibility;

[0032] Figure 4 Schematic diagram of the operating steps of the active and passive polarization transmission characteristics test method for simulating multiple visibility;

[0033] Figure 5 is the polarization state-polarization degree curve.

[0034] Reference numerals:

[0035] Environmental simulation unit 1, active polarized light transmitting unit 2, passive polarized light transmitting unit 3, active polarized light receiving unit 4, passive polarized light receiving 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 reducer -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 meter-401, laser energy meter-402, polarization-maintaining beam splitter-403, first liquid crystal tunable filter-404, second beam reducer-405, full-band polarization camera-501, second liquid crystal tunable filter-502, fourth quarter-wave plate-503. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0037] Existing research often relies on theoretical models and simplified assumptions, lacking systematic verification and experimental data for complex environments. The simulation device can simulate various complex meteorological conditions, such as haze, sea fog, or high humidity. It allows real-time input of the desired visibility and obtains polarized light transmission data at that visibility. This avoids the uncontrollable interference of visibility in natural environments and provides a deeper understanding of the propagation of polarized light in different media. It also studies the impact of varying visibility conditions, verifies and optimizes polarization detection models, and provides a reliable basis for the design and optimization of optical systems in practical applications, reducing experimental costs and improving testing efficiency.

[0038] Therefore, for the study of active and passive polarization transmission characteristics under different visibility in complex environments, there is an urgent need for a testing device and method for active and passive polarization transmission characteristics that simulates multiple visibility.

[0039] The purpose of this application is to study the testing and verification of polarization transmission characteristics in complex environments with constantly changing visibility. The results of active transmission tests and passive imaging tests under the same environment are analyzed and verified. By comparing the transmission loss and scattering characteristics under different polarization states, the consistency of active transmission and passive imaging results is evaluated.

[0040] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the present application is further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0041] In an exemplary embodiment, Figure 1 As shown, a device for testing active and passive polarization transmission characteristics simulating multiple visibilities is provided, comprising: an environment 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.

[0042] An optical barrier wall 7 is provided within the environmental simulation unit 1. Using the optical barrier wall 7 as a reference, the environmental simulation unit 1 is divided into two parts, forming a first environmental simulation unit and a second environmental simulation unit. The environmental simulation unit 1 can be a hemispherical metal box; optical barrier wall 7 is provided at the center of the hemispherical bottom surface.

[0043] An active polarized light receiving unit 4 is provided above the top surface of the first partial environment simulation unit, and an active polarized light emitting unit 2 is provided below the bottom surface of the first partial environment simulation unit. The active polarized light receiving unit 4 is located in the outgoing light path of the active polarized light emitting unit 2.

[0044] The passive polarized light emitting unit 3 and the passive polarized light receiving unit 5 are both arranged at the second part of the environmental simulation unit; the passive polarized light receiving unit 5 is arranged 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.

[0045] The environment 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 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.

[0046] The data analysis unit 9 is used to process the polarization image to obtain the polarization degree, and compare and analyze 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.

[0047] In one embodiment, the active polarized 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 reducer 204 .

[0048] 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; and the first beam reducer 204 is arranged on the outgoing light path of the first quarter-wave plate 203.

[0049] The multi-wavelength laser 201 is used to emit a laser beam.

[0050] The first ultra-wideband visible / near-infrared polarizer 202 is used to modulate the laser beam to obtain polarized light with different polarization states.

[0051] The first quarter-wave plate 203 is used to modulate polarized light into circularly polarized light; the first beam reducer 204 is used to reduce the beam diameter of the circularly polarized light.

[0052] The active polarized light receiving unit 4 includes a polarization state measuring instrument 401 , a laser energy meter 402 , a polarization-maintaining beam splitter 403 , a first liquid crystal tunable filter 404 and a second beam reducer 405 .

[0053] The second beam reducer 405 is arranged on the outgoing light path of the active polarized light emitting unit 2; the first liquid crystal tunable filter 404 is arranged on the outgoing light path of the second beam reducer 405; the polarization-maintaining beam splitter 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 splitter prism 403; and the polarization state meter 401 is located on the 90° beam splitting path of the polarization-maintaining beam splitter prism 403.

[0054] The second beam reducer 405 is used to receive the polarized light emitted by the active polarized light emitting unit 2 and perform beam reduction processing on the beam diameter to obtain a processed beam.

[0055] The first liquid crystal tunable filter 404 is used to filter the processing light beam according to a set wavelength to reduce light source interference.

[0056] The polarization-maintaining beam splitter prism 403 is used to split the light beam processed by the first liquid crystal tunable filter 404 into two, thereby obtaining a first light beam and a second light beam.

[0057] The laser energy meter 402 is used to measure the laser energy of the first light beam.

[0058] The polarization state measuring instrument 401 is used to detect the change information of the polarization state and polarization degree of the second light beam to obtain polarization data.

[0059] 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 .

[0060] 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; and the third quarter-wave plate 305 is arranged on the outgoing light path of the third ultra-wideband visible / near-infrared polarizer 304.

[0061] 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 first polarized light with different polarization states.

[0062] The second quarter-wave plate 303 is used to modulate the first polarized light into a first circularly polarized light.

[0063] 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 a different polarization state.

[0064] The third quarter-wave plate 305 is used to modulate the second polarized light into a second circularly polarized light.

[0065] 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 .

[0066] 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; and the full-band polarization camera 501 is arranged on the outgoing light path of the second liquid crystal tunable filter 502.

[0067] The fourth quarter-wave plate 503 is used to modulate the polarized light emitted by the passive polarized light emitting unit 3 .

[0068] The second liquid crystal tunable filter 502 is used to filter the light beam modulated by the fourth quarter wave plate 503 according to a set wavelength.

[0069] The full-band polarization camera 501 is used to receive the polarization characteristics of reflection and scattering according to the light beam filtered by the second liquid crystal tunable filter 502 to obtain a polarization image.

[0070] As an optional implementation manner, the active and passive polarization transmission characteristic testing device for simulating multiple visibility further includes: a gas circulation unit 6.

[0071] The gas circulation unit 6 is disposed in the environment simulation unit 1 and is located on one side of the optical barrier wall 7 , and is in the same vertical plane as the optical barrier wall 7 .

[0072] The gas circulation unit 6 is used to circulate 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.

[0073] In addition, the active and passive polarization transmission characteristic testing device for simulating multiple visibility further includes: a visibility detection unit 12 and a visibility simulation control unit 10 .

[0074] The visibility detection unit 12 is disposed on the optical barrier wall 7 ; the visibility simulation control unit 10 is connected to the visibility detection unit 12 , the visibility simulation unit 8 and the active polarized light receiving unit 4 respectively.

[0075] The visibility detection unit 12 is used to detect the visibility of the environment.

[0076] The visibility simulation control unit 10 is used to control the visibility simulation unit 8 to generate and emit particles according to the preset visibility and the detected environmental visibility.

[0077] In one embodiment, a first optical window is provided on the bottom surface of the first partial environmental simulation unit, and the first optical window is provided on the outgoing light path of the active polarized light emitting unit 2; a third optical window is provided on the top surface of the first partial environmental simulation unit, and the third optical window is provided on the outgoing light path of the first optical window; the active polarized light receiving unit 4 is on the outgoing light path of the third optical window.

[0078] The second environmental simulation unit is provided with a fourth optical window and a fifth optical window; and the bottom surface of the second environmental simulation unit is provided with a second optical window.

[0079] The fourth optical window is arranged on the outgoing light path of the passive polarized light emitting unit 3; the second optical window is arranged on the outgoing 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 5 is arranged on the outgoing light path of the fifth optical window.

[0080] Specifically, in practical applications, such as Figure 1 As shown, the environmental simulation unit 1 is a hemispherical metal box with an optical barrier 7 at its center, dividing the entire environmental simulation unit 1 into two parts: one part is the active polarized light transmission and reception test environment device, namely the first environmental simulation unit, and the other part is the passive polarized light transmission and reception test environment device, namely the second environmental simulation unit. The environment simulated by the environmental simulation unit 1 is an atmospheric smoke / haze environment or a sea fog environment.

[0081] Optical glass windows are provided at the top and bottom of the environmental simulation unit 1. Specifically, the first optical window and the third optical window are provided at the bottom and top of the first environmental simulation unit, respectively. That is, the first optical window is provided on the bottom surface of the first environmental simulation unit, and the third optical window is provided on the top surface of the first environmental simulation unit. Both the first and third optical windows can be circular optical glass windows. Polarized light emitted by the active polarized light emitting unit 2 enters through the first optical window and exits through the third optical window.

[0082] A second optical window is provided on the bottom surface of the second environmental simulation unit; the second optical window can be a square optical glass window.

[0083] A fourth optical window and a fifth optical window are provided on the top of the second environmental simulation unit, each with a light propagation angle of 90 degrees. Both the fourth optical window and the fifth optical window can be circular optical glass windows.

[0084] The polarized light emitted by the passive polarized light emitting unit 3 enters from the fourth optical window, passes through the target placed at the second optical window, and then exits from the fifth optical window. Figure 2 A top view of the environmental simulation unit.

[0085] The active polarized 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 reducer 204 .

[0086] The multi-wavelength laser 201 , the first ultra-wideband visible / near-infrared polarizer 202 , the first quarter-wave plate 203 and the first beam reducer 204 are arranged in sequence along the same optical axis and along the propagation direction of light.

[0087] The laser beam is emitted by the multi-wavelength laser 201 and passes through the first ultra-wideband visible / near-infrared polarizer 202, the first quarter-wave plate 203 and the first beam reducer 204 in sequence, and then passes through the first partial environment simulation unit to reach the active polarized light receiving unit 4.

[0088] The multi-wavelength laser 201 generates a laser beam of a required wavelength band; the multi-wavelength laser 201 adopts a standard RGB series multi-wavelength laser system.

[0089] 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 adopts Bolder Vision Optik Inc -BVO 1000 ultra-wideband visible / near-infrared polarizer 400nm-1600nm.

[0090] The first quarter-wave plate 203 modulates polarized light into circularly polarized light; the first beam reducer 204 reduces the diameter of the circularly polarized light beam.

[0091] The active polarized light receiving unit 4 includes a polarization state measuring instrument 401 , a laser energy meter 402 , a polarization-maintaining beam splitter 403 , a first liquid crystal tunable filter 404 and a second beam reducer 405 .

[0092] The laser energy meter 402 , the polarization-maintaining beam splitter 403 , the first liquid crystal tunable filter 404 , and the second beam reducer 405 are coaxial and arranged in sequence along the propagation direction of light. The polarization state meter 401 is located on the 90° beam splitting path of the polarization-maintaining beam splitter 403 .

[0093] The polarized light emitted by the active polarized light emitting unit 2 is emitted from the first partial environmental simulation unit to the second beam reducer 405, and then to the polarization-maintaining beam splitter 403. The polarization-maintaining beam splitter 403 splits the polarized light beam into two beams of equal energy, resulting in a first beam and a second beam. In other words, one beam reaches the polarization state measurement instrument 401, and the other reaches the laser energy meter 402.

[0094] The polarization state measuring instrument 401 detects the change information of the polarization state and polarization degree of the second light beam to obtain polarization data; the polarization state measuring instrument 401 is a Thorlabs PAX1000 series polarization measuring instrument.

[0095] The laser energy meter 402 is used to observe the change of laser energy; the laser energy meter 402 adopts a MACH 6 ultrafast laser energy meter.

[0096] The polarization-maintaining beam splitter 403 splits the light beam processed by the first liquid crystal tunable filter 404 into two. The second beam reducer 405 receives the polarized light emitted by the active polarized light emitting unit 2 and reduces the beam diameter to produce a processed light beam. The first liquid crystal tunable filter 404 allows only light of the desired wavelength to pass through, filtering the processed light beam to a set wavelength to reduce interference from other light sources.

[0097] 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 .

[0098] 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 are arranged along the same optical axis and in sequence along the direction of light propagation. The full-band halogen lamp 301 is a MYHA150-VR model.

[0099] The simulated natural light beam is emitted by a 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, and then passes through the second partial environment simulation unit to reach the target at the second optical window.

[0100] 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 used to produce stable polarized light.

[0101] 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 is a SZ-FUSC500MF full-band polarization camera.

[0102] The fourth quarter-wave plate 503, the second liquid crystal tunable filter 502, and the full-band polarization camera 501 are arranged on the same optical axis and in sequence along the propagation direction of light. Light reflected and scattered by the target at the second optical window passes through the second partial environment simulation unit and reaches the fourth quarter-wave plate 503, the second liquid crystal tunable filter 502, and the full-band polarization camera 501.

[0103] The fourth quarter-wave plate 503 is used to stabilize the received polarized light. The second liquid crystal tunable filter 502 allows only light of the required wavelength to pass through, reducing interference from other light and receiving light beams in the target band. The full-band polarization camera 501 receives the polarization characteristics of the reflected and scattered target object to obtain a polarization image.

[0104] The gas circulation unit 6 is placed to the left of the optical barrier wall 7. Its function is to circulate the ambient gas in the first and second environmental simulation units to ensure that the simulated environmental concentrations are consistent. The gas circulation unit 6 is an RV 2.2320 / 32 device.

[0105] The environmental particle generation and emission system, or visibility simulation unit 8, is placed to one side of environmental simulation unit 1, at the same level as optical barrier wall 7 and connected to the unit. Visibility simulation unit 8 generates atmospheric smoke / haze particles or sea fog particles to simulate the desired environmental particle profile. It also emits these particles during the transition from low to high visibility, reducing particle concentration. This system, or visibility simulation unit 8, utilizes the SDL1006 particulate matter online quality control system (standard particle generator).

[0106] Visibility detection unit 12 is placed on optical barrier wall 7. Its purpose is to detect changes in ambient concentration and obtain ambient visibility. This is also compared with the visibility measured by laser energy meter 402. Visibility detection unit 12 uses a Vaisala PWD series sensor.

[0107] The data analysis unit 9 is electrically connected to the polarization state measuring instrument 401 and the full-band polarization camera 501 .

[0108] The data analysis unit 9 processes the polarization image acquired by the full-band polarization camera 501 and compares and calculates the polarization image with the polarization data acquired by the polarization state measuring instrument 401. The data analysis unit 9 is a YE6270 data analysis unit.

[0109] 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 the TH-NJD10 visibility monitoring system.

[0110] The visibility simulation control unit 10 is used to control the visibility of the generated atmospheric smoke / haze or sea fog environment to be the required visibility, and to synchronously control the visibility simulation unit 8 to generate atmospheric smoke / haze particles or sea fog particles, or to emit particles to improve visibility, in accordance with the indication of the visibility detection unit 12.

[0111] The active polarized light emitting unit 2 , the passive polarized light emitting unit 3 , the visibility simulation control unit 10 , the data analysis unit 9 and the system overall control center 11 are electrically connected.

[0112] This application systematically studies the transmission characteristics of both active and passive polarized light in a controlled simulated environment. This not only accurately assesses the effects of scattering from particles like smoke and sea fog on polarization and light intensity, but also compares and analyzes the detection performance and signal attenuation patterns of the two polarized light types. Experimental data integration and summary provide a theoretical foundation and time-saving approach for outdoor experiments. This approach also provides a basis and technical support for applications in military reconnaissance, maritime navigation, environmental monitoring, and remote sensing.

[0113] In an exemplary embodiment, a method for testing active and passive polarization transmission characteristics in simulated multi-visibility is provided. The method is implemented using an active and passive polarization transmission characteristics testing device in simulated multi-visibility.

[0114] like Figure 3 As shown, the active and passive polarization transmission characteristic test method simulating multiple visibility includes:

[0115] Step 100: Obtain polarization data and a polarization image. Polarization data is obtained by detecting polarized light emitted by an active polarization light emitting unit using an active polarization light receiving unit under a set simulated environment and visibility. Polarization images are obtained by detecting polarization characteristics of reflected and scattered light emitted by a passive polarization light emitting unit using a passive polarization light receiving unit under a set simulated environment and visibility.

[0116] Step 200: performing calculation processing on the polarization image to obtain the degree of polarization.

[0117] Step 300: Compare and analyze the polarization data and the degree of polarization to obtain an analysis result. The analysis result is used to characterize the consistency of active and passive polarization transmission.

[0118] The polarization image is processed to obtain the degree of polarization, which includes:

[0119] Convert the polarization image to a grayscale image.

[0120] The polarization intensity and total light intensity are calculated based on the grayscale image; the calculation formula for the polarization intensity is:

[0121] .

[0122] The calculation formula for total light intensity is:

[0123] .

[0124] The degree of polarization is calculated based on the polarization intensity and the total light intensity. The calculation formula for the degree of polarization is:

[0125] .

[0126] 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 coordinate in the grayscale image.

[0127] like Figure 4 The specific steps are as follows:

[0128] Step 1: First, turn on the system's overall control center and send electrical signals to the active polarized light emitting unit and the passive polarized light emitting unit respectively; the active polarized light emitting unit turns on the multi-wavelength laser to emit laser, and the passive polarized light emitting unit turns on the full-band halogen lamp to emit light.

[0129] Step 2: The laser beam emitted by the multi-wavelength laser in the active polarized light emitting unit is modulated into the required linearly polarized light through the first ultra-wideband visible / near-infrared polarizer; the scale of the first ultra-wideband visible / near-infrared polarizer is first calibrated to ensure precise control of the subsequent polarization state; the first ultra-wideband visible / near-infrared polarizer is rotated to modulate polarized light into polarized light of different polarization states; it is then modulated into circularly polarized light through the first quarter-wave plate, and the first quarter-wave plate is rotated to modulate polarized light of left-handed or right-handed polarization state; the first quarter-wave plate is removed when linearly polarized light is required; the laser beam passes through the first beam reducer and is beam-contracted by rotating and modulating the first beam reducer until it reaches the required beam diameter, while ensuring that the optical axis of the first beam reducer 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.

[0130] Step 3. Turn on the full-band halogen lamp to simulate the light source of the natural light band. The unpolarized light is converted into polarized light after passing through the second ultra-wideband visible / near-infrared polarizer, and then it is adjusted to circularly polarized light after passing through the second quarter-wave plate. After passing through the third ultra-wideband visible / near-infrared polarizer, only polarized light parallel to its optical axis can pass through. The polarization state and phase of the light can be precisely controlled and modulated into linearly polarized light. The third ultra-wideband visible / near-infrared polarizer is rotated to modulate polarized light into polarized light of different polarization states, and then the scale of the third ultra-wideband visible / near-infrared polarizer is calibrated; it is then adjusted to circularly polarized light after passing through the third quarter-wave plate, and the third quarter-wave plate is rotated to modulate polarized light into left-handed or right-handed polarization state; the third quarter-wave plate is removed when linearly polarized light is needed; then it passes through the fourth optical window to enter the second part of the environmental simulation unit and finally reaches the target.

[0131] Step 4: The polarized light emitted by the active polarized light emitting unit reaches the active polarized light receiving unit, and then the second beam reducer reduces the beam diameter. The first liquid crystal tunable filter of the corresponding band removes the stray light, and the polarization-maintaining beam splitter splits the light into two. One beam goes to the polarization state measuring instrument to record the polarization state (0, 45, 90, 135, left-handed, right-handed) and polarization degree information of the laser at this time; the other beam goes to the light energy meter, which is also the laser energy meter, to record the initial energy of the light energy meter and observe and record the value changes of the light energy meter.

[0132] Step 5. Turn on the environmental particle generator (i.e., visibility simulation unit) to generate smoke / haze particles or sea fog particles. At the same time, turn on the gas circulation device (i.e., gas circulation unit) to fill the first part of the environmental simulation unit and the second part of the environmental simulation unit with uniform environmental particles to keep the visibility environment of the two consistent.

[0133] Step 6: The visibility simulation control unit calculates the required visibility based on the initial energy from the light energy meter (i.e., laser energy meter) and the final required energy value. It then activates the visibility detection unit to record the visibility value and transmits this data to the visibility simulation control unit. The calculated visibility is then compared with the visibility obtained by the visibility meter (visibility detection unit) to ensure the accuracy of the simulated visibility. Upon reaching the required simulated visibility, the visibility simulation control unit signals the visibility simulation unit to stop injecting particles into the environmental simulation unit. Furthermore, when transitioning from a low-visibility environment to a high-visibility environment, particles are removed from the environmental simulation unit to reduce particle concentration.

[0134] When calculating simulated visibility, the derivation process of the light energy meter change is as follows:

[0135] visibility V It refers to the propagation distance when the target contrast decays to the visual threshold of the human eye.

[0136] .

[0137] .

[0138] in: C is the contrast threshold, usually 0.02 or 0.05; C0 is the initial contrast; is the atmospheric extinction coefficient, in units of .

[0139] According to the definition of optical thickness, optical thickness and light transmittance Related:

[0140] .

[0141] in, ; is the optical thickness; L is the propagation distance; I is the incident light intensity, I 0 is the received light intensity.

[0142] .

[0143] You can Expressed as:

[0144] .

[0145] Substitute into the visibility formula , and eliminate ,have to:

[0146] .

[0147] Experimental propagation distance L =2m or L =2.5m (the height of the cabinet is generally 2m / 2.5m); initial contrast C 0 is usually set to 1, which means it is fully visible.

[0148] Specifically, calculate the atmospheric extinction coefficient: ; Calculate visibility: ; where C0=1, so it simplifies to: .

[0149] Step 7: After the full-band halogen lamp passes through the second environmental simulation unit, the reflected or scattered light from the target reaches the fourth quarter-wave plate. The fourth quarter-wave plate stabilizes the polarization state of the received polarized light. A second liquid crystal tunable filter corresponding to the corresponding wavelength is then selected to remove stray light. The full-band polarization camera then captures the target's polarization information at the four polarization components of 0, 45, 90, and 135, generating a polarization image. This polarization image is then passed to the data analysis unit for processing and calculation of the degree of polarization.

[0150] The calculation process of polarization degree is:

[0151] The acquired polarization image is converted into a grayscale image, wherein the polarization image includes: 、 、 、 , the value of each pixel represents the light intensity at that location.

[0152] : Gray value image of polarization component in 0° direction; : Gray value image of polarization component in 45° direction; : Gray value image of polarization component at 90° direction; : Gray value image of polarization component in 135° direction.

[0153] For the pixel coordinates in the grayscale image , calculate the polarization intensity respectively and total light intensity .

[0154] Polarization intensity : .

[0155] Total light intensity : .

[0156] Degree of polarization The value corresponding to each pixel: .

[0157] The value of the passive polarization transmission characteristic is thus calculated.

[0158] Step 8: The data analysis unit calculates the polarization degree of the polarization image obtained by the passive polarization imaging, that is, the full-band polarization camera, and then compares it with the polarization data measured by the active polarization transmission to analyze the differences in the active and passive polarization transmission characteristics.

[0159] Compare the consistency of the DOP trends between active and passive polarization at different polarization states (0°, 45°, 90°, 135°, left-handed, and right-handed). Use the DOP data obtained for each of the six polarization states to construct a polarization state-DOP comparison table (each group contains six polarization states) and plot each graph (one for active polarization and one for passive polarization).

[0160] Compare whether the shapes of the two curves are similar, that is, whether they have the same change pattern (such as synchronous rise or fall, consistent peaks and valleys, etc.).

[0161] By calculating the deviation between active polarization and passive polarization, the recorded active polarization and passive polarization degree values ​​are first assigned polarization degrees.

[0162] Degree of polarization value of active polarization:

[0163] .

[0164] Degree of polarization value of passive polarization:

[0165] .

[0166] in, is the degree of polarization value of active polarization; is the degree of polarization value of passive polarization;

[0167] For the i The first measurement or i Active polarization value corresponding to each sample; For the i The degree of polarization measured under active transmission; For the i The first measurement or i The passive polarization value corresponding to the sample; For the i The degree of polarization measured in a passive state. i For the serial number.

[0168] Analyzing the degree of polarization value of active polarization A Polarization degree value with passive polarization B Whether consistency is met is determined through the following three processes.

[0169] Process 1: Linear Correlation: Linear Relationship Fitting - Regression Model + Goodness of Fit .

[0170] .

[0171] in, is the regression slope, the ideal value is 1; is the intercept, the ideal value is 0; is the residual term, the smaller the better.

[0172] The expression for goodness of fit (coefficient of determination) is:

[0173] .

[0174] in, For the i The predicted value of the observation; is the average of the actual values ​​of all observations. n is the total number of samples.

[0175] like , indicating that the trends of the two sets of data are highly consistent.

[0176] Process 2: Error Size: Error Magnitude Analysis - RMSE measures the size of the error from the perspective of residual squares. It can be defined using fitting or direct difference:

[0177] Error term : .

[0178] but, .

[0179] RMSE Essentially, it is the root mean square of the squared loss function, which is used to quantify the average deviation between the two.

[0180] Process 3: Difference consistency distribution - Bland-Altman difference and mean analysis.

[0181] Difference : .

[0182] average value : .

[0183] When drawing a graph, is the vertical axis of the coordinate system; The horizontal axis of the coordinate system.

[0184] Average of the differences : .

[0185] Standard deviation of the difference : .

[0186] The consistency interval is .

[0187] If 95% If it falls within this range, there is no obvious systematic deviation between active polarization and passive polarization, and it is considered to be statistically consistent.

[0188] That is: from trend consistency → deviation intensity → systematic error, verify step by step whether the observation results of the two polarization systems under the same environment are consistent, to ensure that the conclusions are statistically reliable and explanatory.

[0189] Table 1 Active polarization value table

[0190]

[0191] Table 2 Passive dynamic polarization value table

[0192]

[0193] The polarization state-polarization degree curve plotted from the data in Table 1 and Table 2 is as follows: Figure 5 The specific processing process is as follows:

[0194] 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.

[0195] According to the calculation process of the above process 2, the first item: , and so on, sum the square differences of the 6 polarization states, average them and take the square root, the result is: , indicating that each point deviates by 9 polarization units on average.

[0196] 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 ,{69.00,70.93,70.29,71.53,78.50,78.71};

[0197] Average of the differences: ; Standard deviation of the difference: .

[0198] Among them, the consistency interval is: Upper limit = ; Lower limit = .

[0199] All differences , which falls completely within the consistency interval, indicating that the error is stable and there is no deviation point.

[0200] Based on the comprehensive analysis of the active polarization and passive polarization data under six polarization states, the results show that there is a high degree of consistency between the two: the determination coefficient of the linear fit is The RMSE (root mean square error) reached a value close to 1, indicating that the two data sets are generally synchronized. The root mean square error (RMSE) was approximately 9, reflecting an average deviation of approximately 9 units between the two systems, though this level of error is within an acceptable range. Bland-Altman analysis showed that the difference between the two systems fell within the range of 7.77 to 10.23, indicating no significant systematic deviation. Overall, while the active system exhibited slightly higher polarization transmission characteristics than the passive system, their polarization transmission characteristics were consistent and reliable in practical applications.

[0201] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, 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, they should be considered to be within the scope of this specification.

[0202] This document uses specific examples to illustrate the principles and implementation methods of this application. The description of the above examples is only intended to help understand the method and core concept of this application. At the same time, for those skilled in the art, based on the concept of this application, there may be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting this application.

Claims

1. A device for testing active and passive polarization transmission characteristics simulating multiple visibility, characterized in that: include: Environmental simulation unit, active polarized light emitting unit, passive polarized light emitting unit, active polarized light receiving unit, passive polarized light receiving unit, data analysis unit and visibility simulation unit; An optical barrier wall is set up in the environmental simulation unit; Taking the optical barrier wall as a reference, the environmental simulation unit is divided into two parts, obtaining a first environmental simulation unit and a second environmental simulation unit; An active polarized light receiving unit is provided above the top surface of the first environmental simulation unit, and an active polarized light emitting unit is provided below the bottom surface of the first environmental simulation unit. 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 emitting unit, and the angle between the outgoing light path of the passive polarized light emitting unit and the incident light path of the passive polarized light receiving unit is 90°; the data analysis unit is connected to the active polarized light receiving unit and the passive polarized light receiving unit respectively; 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 in the set simulation environment to change 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 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 results are used to characterize the consistency of active and passive polarization transmission; Also included: a gas circulation unit; The gas circulation unit is arranged in the environmental simulation unit and is located on one side of the optical barrier wall and in the same vertical plane as the optical barrier wall; The gas circulation unit is used to circulate the environmental gas in the first environmental simulation unit and the second environmental simulation unit so that the environmental concentrations in the first environmental simulation unit and the second environmental simulation unit are the same; It also includes: a visibility detection unit and a visibility simulation control unit; The visibility detection unit is arranged on the optical barrier wall; the visibility simulation control unit is connected to the visibility detection unit, the visibility simulation unit and the active polarized light receiving unit respectively; The visibility detection unit is used to detect 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; Solving the polarization image to obtain the degree of polarization specifically includes: Converting the polarization image into a grayscale image; The polarization intensity and the total light intensity are calculated based on the grayscale 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 coordinate in the grayscale image.

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 includes: a multi-wavelength laser, a first ultra-wideband visible / near-infrared polarizer, a first quarter-wave plate, and a first beam reducer; A first ultra-wideband visible / near-infrared polarizer is disposed on the outgoing light path of the multi-wavelength laser; a first quarter-wave plate is disposed on the outgoing light path of the first ultra-wideband visible / near-infrared polarizer; and a first beam reducer is disposed 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 includes: a polarization state measuring instrument, a laser energy meter, a polarization-maintaining beam splitter, a first liquid crystal tunable filter and a second beam reducer; A second beam reducer is disposed on the outgoing light path of the active polarized light emitting unit; a first liquid crystal tunable filter is disposed on the outgoing light path of the second beam reducer; a polarization-maintaining beam splitter prism is disposed on the outgoing light path of the first liquid crystal tunable filter; a laser energy meter is disposed on the outgoing light path of the polarization-maintaining beam splitter prism; and a 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 processing light beam according to the set wavelength to reduce light source interference; The polarization-maintaining beam splitter 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 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 characteristic test 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; A second ultra-wideband visible / near-infrared polarizer is disposed on the outgoing light path of the full-band halogen lamp; a second quarter-wave plate is disposed on the outgoing light path of the second ultra-wideband visible / near-infrared polarizer; a third ultra-wideband visible / near-infrared polarizer is disposed on the outgoing light path of the second quarter-wave plate; and a third quarter-wave plate is disposed 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 to modulate the natural light beam to obtain 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 to modulate the second polarized light into second circularly polarized light.

5. The active and passive polarization transmission characteristic test 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: A first optical window is provided on the bottom surface of the first partial environmental simulation unit, and the first optical window is provided on the outgoing light path of the active polarized light emitting unit; a third optical window is provided on the top surface of the first partial environmental simulation unit, and the third optical window is provided on the outgoing light path of the first optical window; the active polarized light receiving unit is located on the outgoing light path of the third optical window; The second environmental simulation unit is provided with a fourth optical window and a fifth optical window; the bottom surface of the second environmental simulation unit is provided with a second optical window; 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 outgoing 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.

7. A method for testing active and passive polarization transmission characteristics simulating multiple visibility, characterized in that: The method is implemented by using the device for testing active and passive polarization transmission characteristics of simulated multi-visibility according to any one of claims 1 to 6; the method for testing active and passive polarization transmission characteristics of simulated multi-visibility comprises: Obtain polarization data and a polarization image; the polarization data is obtained by detecting polarized light emitted by an active polarization light emitting unit using an active polarization light receiving unit under a set simulated environment and visibility; the polarization image is obtained by detecting polarization characteristics of reflection and scattering of polarized light emitted by a passive polarization light emitting unit using a passive polarization light receiving unit under a set simulated environment and visibility; 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.

8. The method for testing active and passive polarization transmission characteristics simulating multiple visibility according to claim 7, characterized in that: Solving the polarization image to obtain the degree of polarization specifically includes: Converting the polarization image into a grayscale image; The polarization intensity and the total light intensity are calculated based on the grayscale 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 coordinate in the grayscale image.

Images