CN111854958B - Active and passive testing method and system for polarized light transmission characteristics in complex sea fog environment - Google Patents
Active and passive testing method and system for polarized light transmission characteristics in complex sea fog environment Download PDFInfo
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Abstract
The invention discloses a polarized light transmission characteristic active and passive test method and a polarized light transmission characteristic active and passive test system under a complex sea fog environment, which belong to the technical field of photoelectric detection and comprise a polarized information active transmission test system and a polarized information passive transmission test system. The polarized light transmission characteristics of polarized light with different wavelengths under the condition of different test parameters are researched through an active and passive test system of polarized light transmission characteristics of the sea fog environment, and the polarized light transmission characteristics of the polarized light under the complex sea fog environment are analyzed; and meanwhile, an infrared polarization imaging method is adopted to analyze the transmission characteristics of infrared polarization information of targets at different distances and compare zero-line-of-sight target polarization imaging. By the method, the transmission characteristics of the sea fog under different environmental conditions are subjected to polarization characteristic test, and the complex sea fog environment is subjected to passive transmission imaging test research.
Description
Technical Field
The invention belongs to the technical field of photoelectric detection, and particularly relates to a method and a system for actively and passively testing polarized light transmission characteristics in a complex sea fog environment.
Background
The sea environment is affected by the weather of the monsoon, so that the sea environment is a main factor affecting polarization and information transmission characteristics all the year round, the problem that a typical target is not far seen in sea fog under the sea environment is caused, and the complex sea environment is a main factor affecting the optical detection and identification performance, wherein the sea fog effect is particularly serious. The light scattering and light attenuation of the sea fog particles seriously affect the performance of an optical imaging instrument, so that the contrast of an intensity image is low and is not clearly known, and adverse effects are caused on transportation, ocean fishing, ocean development engineering, military operations and the like.
Since polarization imaging has the advantage of penetrating sea fog, the extinction degree of natural environment shielding such as sea fog is different according to different wavelengths, and meanwhile, the absorption and scattering intensity of particles on light waves are dependent on the size, composition and concentration of particle sizes. The polarized light transmission characteristic test system for the complex sea fog environment is constructed based on transmission models of infrared light and visible light with different wavelengths and different polarization modes and under different sea fog concentrations, and provides theoretical correction and technical test support for high-precision imaging detection of ocean targets, so that the system has important value and significance.
There is a need in the art for a new solution to this problem.
Disclosure of Invention
In order to know the change condition of polarization parameters of light in the sea fog transmission process, the invention aims to provide an active and passive test method and system for the polarization light transmission characteristic in a complex sea fog environment. And meanwhile, carrying out passive transmission imaging tests of different distances and different sea fog environments on the influence of the transmission of polarized light with different wavelengths, generating infrared polarized light with different wave bands by using a blackbody standard infrared light source and a metal wire grid polaroid, carrying out polarization imaging on a typical target in different sea fog environments within a certain viewing distance by adopting an infrared polarization imaging method, comparing the obtained result with zero-viewing-distance target polarization imaging, and analyzing the transmission characteristics of infrared polarization information of the target at different distances. And carrying out polarization characteristic test on the transmission characteristics of the composite material under different sea fog environment conditions, and carrying out passive transmission imaging test research on the complex sea fog environment. The method realizes the complementary verification of the active and passive polarization transmission characteristics, and improves the accuracy and reliability of analysis of test results.
In order to achieve the above purpose, the present invention adopts the following technical scheme: the polarized light transmission characteristic active and passive test system under the complex sea fog environment is characterized in that the system comprises a polarized information active transmission test system and a polarized information passive transmission test system,
The polarization information active transmission testing system comprises a polarized light emitting optical subsystem, a first two-dimensional angle adjusting platform, a polarization characteristic detection receiving optical subsystem, a second two-dimensional angle adjusting platform and a polarization information calculating and processing subsystem, wherein the polarized light emitting optical subsystem is arranged on the first two-dimensional angle adjusting platform; the polarization characteristic detection and reception optical subsystem is arranged on the second two-dimensional angle adjustment platform, and is electrically connected with the polarization information calculation and processing subsystem; the first two-dimensional angle adjustment platform and the second two-dimensional angle adjustment platform are used for controlling alignment between the polarized light emitting optical subsystem and the polarized characteristic detection receiving optical subsystem, so that parallel light beams emitted by the polarized light emitting optical subsystem are enabled to be parallel to enter the polarized characteristic detection receiving optical subsystem after passing through the sea fog medium;
The polarized light emission optical subsystem comprises an ultra-wideband tunable laser, an attenuation sheet, a first biconvex lens, a polarizer and a quarter glass slide, wherein the ultra-wideband tunable laser, the attenuation sheet, the first biconvex lens, the polarizer and the quarter glass slide are sequentially arranged along the light propagation direction along the same optical axis;
The polarization characteristic detection and reception optical subsystem comprises a hemispherical lens, a beam contractor, a narrow-band optical filter, a second biconvex lens and a polarization state measuring instrument, wherein the hemispherical lens, the beam contractor, the narrow-band optical filter, the second biconvex lens and the polarization state measuring instrument are coaxially arranged in sequence along the light propagation direction;
The polarized information passive transmission testing system comprises an infrared polarized light generating subsystem and an infrared polarized characteristic detecting subsystem, wherein the infrared polarized light generating subsystem and the infrared polarized characteristic detecting subsystem are respectively arranged at two sides of a sea fog medium, the infrared polarized light generating subsystem comprises a blackbody standard infrared light source and a metal wire grid polaroid, the metal wire grid polaroid and the blackbody standard infrared light source have the same optical axis, and the metal wire grid polaroid is arranged on an emergent light path of the blackbody standard infrared light source; the infrared polarization characteristic detection subsystem comprises a short-wave infrared polarization detector, a medium-wave infrared polarization detector and a long-wave infrared polarization detector, wherein the short-wave infrared polarization detector, the medium-wave infrared polarization detector and the long-wave infrared polarization detector are used for correspondingly receiving infrared polarized light with different wavelengths emitted by the infrared polarized light generation subsystem and are independent from each other.
Further, the beam reducer is a variable-magnification beam reducer.
The method for testing the polarization transmission characteristic active and passive in the complex sea fog environment is characterized by adopting the polarization transmission characteristic active and passive testing system in the complex sea fog environment for testing, and specifically comprises the following steps:
step one, adjusting a first two-dimensional angle adjustment platform and a second two-dimensional angle adjustment platform to align a polarized light transmitting optical subsystem and a polarized characteristic detecting and receiving optical subsystem;
Turning on an ultra-wideband tunable laser in a polarized light emission optical subsystem, and sequentially emitting laser beams emitted by the ultra-wideband tunable laser through an attenuation sheet, a first biconvex lens, a polarizer and a quarter glass slide to obtain polarized light, and emitting the polarized light to a sea fog medium;
Step three, polarized light is emitted from the sea fog medium and then is emitted to the polarization characteristic detection receiving optical subsystem;
Step four, the polarized characteristic detection receiving optical subsystem receives polarized light carrying sea fog information emitted from sea fog medium, the polarized light carrying sea fog information sequentially passes through a hemispherical lens, a beam contractor, a narrow-band optical filter, a second biconvex lens and a polarization state measuring instrument and then is emitted to enter the polarization information calculation processing subsystem;
fifthly, the polarization information calculation processing subsystem receives the light beams emitted by the polarization characteristic detection receiving optical subsystem, and performs polarization mode identification and processing to obtain polarization light information of polarized light transmitted by the sea fog environment;
Step six, repeating the step one to the step five, testing the polarization characteristics of different wave bands for the transmission characteristics under different sea fog environment conditions, and observing the change condition of the polarization characteristics of the laser beam after the laser beam is transmitted in the sea fog environment, so as to analyze the change of the polarization characteristics of the laser beam in the sea fog environment;
step seven, starting a blackbody standard infrared light source in the infrared polarized light generating subsystem, enabling infrared light emitted by the blackbody standard infrared light source to enter a metal wire grid polarizing plate, obtaining infrared polarized light after being emitted by the metal wire grid polarizing plate, and radiating the infrared polarized light to the sea fog medium in the step one;
step eight, infrared polarized light is emitted from the sea fog medium and then is emitted to an infrared polarization characteristic detection subsystem to carry out infrared polarization imaging;
According to the wavelength condition of the infrared polarized light, the infrared polarization characteristic detection subsystem adopts a short-wave infrared polarization detector, a medium-wave infrared polarization detector or a long-wave infrared polarization detector;
Step nine, repeating the step seven and the step eight, carrying out polarized imaging on the target in different sea fog environments within a certain viewing distance, comparing the obtained result with zero-viewing-distance target polarized imaging, and analyzing the transmission characteristics of infrared polarized information of the target at different distances;
And step ten, combining the step six and the step nine to obtain the polarized light transmission characteristic under the complex sea fog environment.
The polarized light information comprises polarized light stokes vectors, polarization degree and polarization angle.
Through the design scheme, the invention has the following beneficial effects: the polarized light emission optical subsystem established by the invention can generate polarized light beams with different wavelengths, and the polarized light beams penetrate sea fog media with different distances and different visibility, so that the polarized light transmission characteristics of the polarized light with different wavelengths in complex sea fog environments under different test parameter conditions can be explored, and the test conditions can be changed according to actual requirements; the polarization characteristic detection receiving optical subsystem established by the invention can obtain polarized light information transmitted through sea fog media, such as parameters of output stokes vector, polarization degree, polarization angle and the like, so that the polarization transmission characteristic of polarized light in a complex sea fog environment can be analyzed; the polarization characteristic detection receiving optical subsystem constructed by the invention can acquire polarization information corresponding to different wavelength filtering after being transmitted by complex sea fog environments with different visibility by changing the optical filters with different wavelengths. Meanwhile, passive transmission tests of different distances and different sea fog environments on the influence of polarized light transmission are carried out, infrared polarized light of different wave bands is generated by using a blackbody standard infrared light source and a metal wire grid polaroid, a typical target is polarized and imaged in different environments within a certain viewing distance by adopting an infrared polarization imaging method, and the obtained result is compared with zero-viewing-distance target polarized imaging to analyze the transmission characteristics of infrared polarized information of the target at different distances. And carrying out polarization characteristic test on the transmission characteristics of the composite material under different environmental conditions, and carrying out passive transmission imaging test research on complex sea fog environments. The method realizes the complementary verification of the active and passive polarization transmission characteristics, and improves the accuracy and reliability of analysis of test results. A certain theoretical and technical foundation is laid for realizing the transmission of polarization information and the improvement of the detection capability of a polarization target in a complex sea fog environment.
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The invention is further described in the following description and detailed description with reference to the drawings:
Fig. 1 is a schematic diagram of a polarization information active transmission test system in a polarization light transmission characteristic active-passive test system under a complex sea fog environment.
Fig. 2 is a schematic diagram of a polarization information passive transmission testing system of a polarization light transmission characteristic active-passive testing system under a complex sea fog environment according to an embodiment of the present invention.
Fig. 3 is a schematic diagram II of a polarization information passive transmission test system of a polarization light transmission characteristic active-passive test system under a complex sea fog environment in the embodiment of the invention.
Fig. 4 illustrates a third schematic diagram of a polarization information passive transmission test system of a polarization light transmission characteristic active-passive test system under a complex sea fog environment in an embodiment of the present invention.
In the figure: 1-a polarized light emitting optical subsystem; 2-a first two-dimensional angle adjustment platform; a 3-polarization characteristic detection receiving optical subsystem; 4-a second two-dimensional angle adjustment platform; a 5-polarization information calculation processing subsystem; a 6-infrared polarized light generation subsystem; 7-an infrared polarization characteristic detection subsystem; 8-an ultra wideband tunable laser; 9-an attenuation sheet; 10-a first lenticular lens; 11-a polarizer; 12-quarter slides; 13-hemispherical lenses; 14-beam contractor; 15-a narrowband filter; 16-a second biconvex lens; 17-polarization state measuring instrument; 18-blackbody standard infrared light source; 19-a metal wire grid polarizer; 20-short wave infrared polarization detector; 21-a medium wave infrared polarization detector; 22-long wave infrared polarization detector.
Detailed Description
In order to more clearly illustrate the present invention, the present invention will be further described with reference to the preferred embodiments, fig. 1, fig. 2, fig. 3 and fig. 4. It is to be understood by persons skilled in the art that the following detailed description is illustrative and not restrictive, and that this invention is not limited to the details given herein. Unless defined otherwise, technical or scientific terms used herein should be given the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs. In the description of the present invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and that the features defining "first" and "second" are not necessarily indicative of any order, quantity, or importance, but are merely used to distinguish between different components.
Firstly, carrying out active transmission tests on the influence of polarized light transmission with different wavelengths under different sea fog environments, adopting laser with different wavelengths and different types to establish a test system, carrying out collimation and beam expansion through a transmitting optical system, and then respectively modulating the polarizer 11 and the quarter glass 12 into linear polarized light with horizontal linear polarization or vertical linear polarization, and carrying out left-handed or right-handed circular polarization by using a polarization modulation method to generate polarized light with different wave bands, and carrying out transmission through sea fog; the receiving end is detected by a polarization state measuring instrument 17, the transmission characteristics of the laser under different environmental conditions are tested for different wave band polarization characteristics, and the change condition of the polarization characteristics of the laser after the laser is transmitted by sea fog is observed, so that the change of the polarization characteristics of the laser under the sea fog environment is analyzed. And meanwhile, carrying out passive transmission tests of different distances and different sea fog environments on the influence of polarized light transmission, generating infrared polarized light with different wave bands by using a blackbody standard infrared light source 18 and a metal wire grid polaroid 19, carrying out polarized imaging on a typical target in different environments within a certain viewing distance by adopting an infrared polarized imaging method, comparing the obtained result with zero-viewing-distance target polarized imaging, and analyzing the transmission characteristics of infrared polarized information of the target at different distances. And carrying out polarization characteristic test on the transmission characteristics of the composite material under different environmental conditions, and carrying out passive transmission imaging test research on complex sea fog environments. The method realizes the complementary verification of the active and passive polarization transmission characteristics, and improves the accuracy and reliability of analysis of test results.
The polarized light transmission characteristic active and passive test system under the complex sea fog environment is characterized in that the system comprises a polarized information active transmission test system and a polarized information passive transmission test system,
The polarization information active transmission testing system comprises a polarized light emitting optical subsystem 1, a first two-dimensional angle adjusting platform 2, a polarization characteristic detection receiving optical subsystem 3, a second two-dimensional angle adjusting platform 4 and a polarization information calculation processing subsystem 5, wherein the polarized light emitting optical subsystem 1 is arranged on the first two-dimensional angle adjusting platform 2; the polarization characteristic detection and reception optical subsystem 3 is arranged on the second two-dimensional angle adjustment platform 4, and the polarization characteristic detection and reception optical subsystem 3 is electrically connected with the polarization information calculation processing subsystem 5; the first two-dimensional angle adjustment platform 2 and the second two-dimensional angle adjustment platform 4 are used for controlling alignment between the polarized light emitting optical subsystem 1 and the polarized characteristic detection receiving optical subsystem 3, so that parallel light beams emitted by the polarized light emitting optical subsystem 1 are ensured to be parallel to enter the polarized characteristic detection receiving optical subsystem 3 after passing through a sea fog medium;
The polarized light emission optical subsystem 1 comprises an ultra-wideband tunable laser 8, an attenuation sheet 9, a first biconvex lens 10, a polarizer 11 and a quarter glass slide 12, wherein the ultra-wideband tunable laser 8, the attenuation sheet 9, the first biconvex lens 10, the polarizer 11 and the quarter glass slide 12 are arranged with the optical axis in sequence along the light propagation direction; the ultra-wideband tunable laser 8 is used for emitting laser beams with different modes, and the ultra-wideband tunable laser 8 adopts Russian Tekhnoscan company-T & D-scan model ultra-wideband tunable lasers; the attenuator 9 is a UV-NIR model attenuator of Aitermont optics (Shenzhen Co., ltd.; the first lenticular lens 10 is a #32-023 type lenticular lens of the Aitty optics (Shenzhen Co., ltd.; the polarizer 11 is a model #54-204 polarizer of Aittmonte optics (Shenzhen Co., ltd.); the quarter glass 12 is a quarter glass of model N-BK7 of Aitty optics (Shenzhen Co., ltd.;
The polarization characteristic detection and reception optical subsystem 3 comprises a hemispherical lens 13, a beam reducer 14, a narrow-band optical filter 15, a second biconvex lens 16 and a polarization state measuring instrument 17, wherein the hemispherical lens 13, the beam reducer 14, the narrow-band optical filter 15, the second biconvex lens 16 and the polarization state measuring instrument 17 are arranged with the same optical axis and in sequence along the light propagation direction; the hemispherical lens 13 is an S-LAH79 hemispherical lens of Aitermonte optical (Shenzhen Co., ltd.; the beam contractor 14 is a VEX series model beam contractor of Litsea Optogama company; the narrow-band filter 15 adopts a #46-547 type narrow-band filter of Aitermont optics (Shenzhen Co., ltd.; the second biconvex lens 16 is a #32-023 type biconvex lens of Aitty optics (Shenzhen Co., ltd.; the polarization state measuring instrument 17 is a PAX1000IR1 type polarization state measuring instrument of Thorolabs company of America;
the polarization information calculation processing subsystem 5 comprises a computer and a software operating system corresponding to the polarization state measuring instrument 17 in the computer.
The light beam emitted by the ultra-wideband tunable laser 8 sequentially passes through the attenuation sheet 9, the first biconvex lens 10, the polarizer 11 and the quarter glass slide 12 to complete polarization and polarized light mode control; the light beam received by the polarization characteristic detection receiving optical subsystem 3 sequentially passes through the hemispherical lens 13, the beam contractor 14, the narrow-band filter 15, the second biconvex lens 16 and the polarization state measuring instrument 17 to finish the polarization detection of the received polarized light beam; the polarization information is subjected to pattern recognition and calculation processing by the polarization information calculation processing subsystem 5.
The polarized information passive transmission testing system comprises an infrared polarized light generation subsystem 6 and an infrared polarized characteristic detection subsystem 7, wherein the infrared polarized light generation subsystem 6 and the infrared polarized characteristic detection subsystem 7 are respectively arranged at two sides of a sea fog medium, the infrared polarized light generation subsystem 6 comprises a blackbody standard infrared light source 18 and a metal wire grid polarizing plate 19, the blackbody standard infrared light source 18 is used for generating infrared light with different wave bands, the metal wire grid polarizing plate 19 and the blackbody standard infrared light source 18 have the same optical axis, and the metal wire grid polarizing plate 19 is arranged on an emergent light path of the blackbody standard infrared light source 18; the infrared polarization characteristic detection subsystem 7 includes a short-wave infrared polarization detector 20, a medium-wave infrared polarization detector 21, and a long-wave infrared polarization detector 22, where the short-wave infrared polarization detector 20, the medium-wave infrared polarization detector 21, and the long-wave infrared polarization detector 22 are configured to correspondingly receive infrared polarized light with different wavelengths emitted by the infrared polarized light generating subsystem 6, and are independent from each other. If the short-wave infrared polarized light emitted by the infrared polarized light generating subsystem 6 is the short-wave infrared polarized light detector 20, see fig. 2 in detail; the mid-wave infrared polarization detector 21 is adopted for the mid-wave infrared polarized light emitted by the infrared polarized light generating subsystem 6, and the details are shown in fig. 3; the long-wave infrared polarization detector 22 is adopted for the mid-band infrared polarized light emitted by the infrared polarized light generating subsystem 6, as shown in fig. 4; the blackbody standard infrared light source 18 adopts a EMIRS model blackbody standard infrared light source of the company Axetris in switzerland; the metal wire grid polarizer 19 is a VLS-100-UV model metal wire grid polarizer from Meadowlark optics; the short wave infrared polarization detector 20 is a Bobcat-640-GigE model short wave infrared polarization detector manufactured by Belgium XenICs; the medium wave infrared polarization detector 21 adopts a XenICs company Tigris-640 model medium wave infrared detector; the long-wave infrared polarization detector 22 is a type XenICs Gobi-640-Gige long-wave infrared polarization detector.
The method for testing the polarization transmission characteristic active and passive in the complex sea fog environment is characterized by adopting the polarization transmission characteristic active and passive testing system in the complex sea fog environment for testing, and specifically comprises the following steps:
Step one, adjusting a first two-dimensional angle adjustment platform 2 and a second two-dimensional angle adjustment platform 4 to align a polarized light transmitting optical subsystem 1 and a polarized characteristic detecting and receiving optical subsystem 3;
Step two, turning on an ultra-wideband tunable laser 8 in the polarized light emission optical subsystem 1, wherein laser beams emitted by the ultra-wideband tunable laser 8 sequentially pass through an attenuation sheet 9, a first biconvex lens 10, a polarizer 11 and a quarter glass 12 to complete polarization and polarized light mode control, polarized light is obtained, and polarized light emitted by the quarter glass 12 is directed to sea fog media;
Step three, polarized light is emitted from the sea fog medium and then is emitted to the polarization characteristic detection receiving optical subsystem 3;
step four, the polarized characteristic detection receiving optical subsystem 3 receives polarized light carrying sea fog information emitted from sea fog medium, the polarized light carrying sea fog information sequentially passes through the hemispherical lens 13, the beam contractor 14, the narrow-band filter 15, the second biconvex lens 16 and the polarization state measuring instrument 17 to finish receiving and polarization detection of the polarized light, and the polarized light after polarization detection enters the polarized information calculation processing subsystem 5;
Step five, the polarization information calculation processing subsystem 5 receives the light beam emitted by the polarization characteristic detection receiving optical subsystem 3, and performs polarization mode identification and processing to obtain polarization light information of polarized light transmitted by sea fog environment; the polarized light information comprises polarized light stokes vectors, polarization degree and polarization angle;
Step six, repeating the step one to the step five, testing the polarization characteristics of different wave bands for the transmission characteristics under different sea fog environment conditions, and observing the change condition of the polarization characteristics of the laser beam after the laser beam is transmitted in the sea fog environment, so as to analyze the change of the polarization characteristics of the laser beam in the sea fog environment;
Step seven, turning on a blackbody standard infrared light source 18 in the infrared polarized light generating subsystem 6, wherein infrared light emitted by the blackbody standard infrared light source 18 is incident to a metal wire grid polarizing plate 19, is emitted through the metal wire grid polarizing plate 19 to obtain infrared polarized light, and is emitted to the sea fog medium in the step one;
Step eight, infrared polarized light is emitted from the sea fog medium and then is emitted to an infrared polarization characteristic detection subsystem 7 for infrared polarization imaging;
And according to the wavelength condition of the infrared polarized light, the infrared polarization characteristic detection subsystem 7 adopts a short-wave infrared polarization detector 20, a medium-wave infrared polarization detector 21 or a long-wave infrared polarization detector 22;
Step nine, repeating the step seven and the step eight, carrying out polarized imaging on the target in different sea fog environments within a certain viewing distance, comparing the obtained result with zero-viewing-distance target polarized imaging, and analyzing the transmission characteristics of infrared polarized information of the target at different distances; carrying out polarization characteristic test on the transmission characteristics of the composite material under different environmental conditions, and carrying out passive transmission imaging test research on complex sea fog environments;
And step ten, combining the step six and the step nine to obtain the polarized light transmission characteristic under the complex sea fog environment.
Claims (2)
1. The active and passive test method for the polarized light transmission characteristic in the complex sea fog environment is characterized by comprising the following steps:
Step one, adjusting a first two-dimensional angle adjustment platform (2) and a second two-dimensional angle adjustment platform (4) to align a polarized light emitting optical subsystem (1) and a polarized characteristic detection receiving optical subsystem (3);
Step two, turning on an ultra-wideband tunable laser (8) in a polarized light emission optical subsystem (1), and sequentially emitting laser beams emitted by the ultra-wideband tunable laser (8) through an attenuation sheet (9), a first biconvex lens (10), a polarizer (11) and a quarter glass slide (12) to obtain polarized light, and emitting the polarized light to a sea fog medium;
step three, polarized light is emitted from the sea fog medium and then is emitted to the polarization characteristic detection receiving optical subsystem (3);
Step four, a polarization characteristic detection receiving optical subsystem (3) receives polarized light carrying sea fog information emitted from sea fog medium, the polarized light carrying sea fog information sequentially passes through a hemispherical lens (13), a beam contractor (14), a narrow-band optical filter (15), a second biconvex lens (16) and a polarization state measuring instrument (17) and then is emitted, and enters a polarization information calculation processing subsystem (5);
step five, a polarization information calculation processing subsystem (5) receives the light beams emitted by the polarization characteristic detection receiving optical subsystem (3), and performs polarization mode identification and processing to obtain polarization light information of polarized light transmitted by sea fog environment;
Step six, repeating the step one to the step five, testing the polarization characteristics of different wave bands for the transmission characteristics under different sea fog environment conditions, and observing the change condition of the polarization characteristics of the laser beam after the laser beam is transmitted in the sea fog environment, so as to analyze the change of the polarization characteristics of the laser beam in the sea fog environment;
Step seven, starting a blackbody standard infrared light source (18) in the infrared polarized light generating subsystem (6), enabling infrared light emitted by the blackbody standard infrared light source (18) to enter a metal wire grid polarizing plate (19), obtaining infrared polarized light after being emitted by the metal wire grid polarizing plate (19), and radiating the infrared polarized light to the sea fog medium in the step one;
step eight, infrared polarized light is emitted from the sea fog medium and then is emitted to an infrared polarization characteristic detection subsystem (7) for infrared polarization imaging;
According to the wavelength condition of infrared polarized light, the infrared polarization characteristic detection subsystem (7) adopts a short-wave infrared polarization detector (20), a medium-wave infrared polarization detector (21) or a long-wave infrared polarization detector (22);
Step nine, repeating the step seven and the step eight, carrying out polarized imaging on the target in different sea fog environments within a certain viewing distance, comparing the obtained result with zero-viewing-distance target polarized imaging, and analyzing the transmission characteristics of infrared polarized information of the target at different distances;
And step ten, combining the step six and the step nine to obtain the polarized light transmission characteristic under the complex sea fog environment.
2. The method for actively and passively testing the transmission characteristics of polarized light in a complex sea fog environment according to claim 1, wherein the method comprises the following steps: the polarized light information comprises polarized light stokes vectors, polarization degree and polarization angle.
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