CN111854958A - 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 system in a complex sea fog environment, belongs to the technical field of photoelectric detection, and comprises a polarized information active transmission test system and a polarized information passive transmission test system. The polarization transmission characteristics of polarized light with different wavelengths in the complex sea fog environment under different test parameter conditions are explored through an active and passive test system for the polarization transmission characteristics of the polarized light in the sea fog environment, and the polarization transmission characteristics of the polarized light in the complex sea fog environment are analyzed; meanwhile, an infrared polarization imaging method is adopted to analyze the transmission characteristics of the infrared polarization information of the targets at different distances and compare the polarization imaging of the zero-line-of-sight targets. By the method, the polarization characteristic of the transmission characteristic of the optical fiber is tested under different environmental conditions, and passive transmission imaging test research is carried out on a complex sea fog environment.
Description
Technical Field
The invention belongs to the technical field of photoelectric detection, and particularly relates to an active and passive testing method and system for polarized light transmission characteristics in a complex sea fog environment.
Background
The marine environment is influenced by monsoon climate, so that the climate is mostly in fog days all the year round, the sea fog environment is a main factor influencing polarization and information transmission characteristics, the problem that a typical target is not far seen in sea fog under the marine environment is caused, the complex marine environment is a main factor influencing optical detection and identification performance, and the sea fog influence is particularly serious. Light scattering and light attenuation of sea fog particles seriously affect the performance of an optical imaging instrument, cause low contrast and unclear recognition of an intensity image, and cause adverse effects on transportation, marine fishing, marine development engineering, military activities and the like.
Polarization imaging has the advantage of penetrating sea fog, and the extinction degree of natural environment shielding such as sea fog is different with different wavelengths, and is determined by the absorption and scattering intensity of particles on light waves, and the scattering intensity of particles is determined by the size, composition and concentration of particle diameters. The transmission mechanism of polarized light information in a complex sea fog environment needs to be analyzed in the typical sea fog environment, and a complex sea fog environment polarized light transmission characteristic test system is constructed based on transmission models of infrared light and visible light with different wavelengths and different polarization state modes under different sea fog concentrations, so that theoretical correction and technical test support are provided for high-precision imaging detection of a marine target, and the method has important value and significance.
Therefore, there is a need in the art for a new solution to solve 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 transmission characteristic of the polarized light in a complex sea fog environment. And simultaneously carrying out passive transmission imaging tests on the transmission influence of polarized light with different wavelengths in different distances and different sea fog environments, generating infrared polarized light with different wave bands by utilizing a black body 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 visual range by adopting an infrared polarization imaging method, comparing the obtained result with the polarization imaging of a zero-visual-range target, and analyzing the transmission characteristics of infrared polarization information of the target at different distances. And the polarization characteristic test is carried out on the transmission characteristic of the optical fiber under different sea fog environment conditions, and the passive transmission imaging test research is carried out on the complex sea fog environment. Therefore, the mutual complementation verification of the transmission characteristics of the active polarization and the passive polarization is realized, and the accuracy and the reliability of the analysis of the test result are improved.
In order to achieve the purpose, the invention adopts the following technical scheme: the active and passive test system for polarized light transmission characteristics in a complex sea fog environment is characterized by comprising a polarized information active transmission test system and a polarized information passive transmission test system,
the polarization information active transmission test 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 calculation processing subsystem, wherein the polarized light emitting optical subsystem is arranged on the first two-dimensional angle adjusting platform; the polarization characteristic detection receiving optical subsystem is arranged on the second two-dimensional angle adjusting platform and is electrically connected with the polarization information calculation processing subsystem; the first two-dimensional angle adjusting platform and the second two-dimensional angle adjusting platform are used for controlling alignment between the polarized light emitting optical subsystem and the polarization characteristic detecting and receiving optical subsystem and ensuring that parallel light beams emitted by the polarized light emitting optical subsystem are parallelly incident to the polarization characteristic detecting and receiving optical subsystem after passing through a sea fog medium;
the polarized light emission optical subsystem comprises an ultra-wide band tunable laser, an attenuation sheet, a first biconvex lens, a polarizer and a quarter glass slide, wherein the ultra-wide band tunable laser, the attenuation sheet, the first biconvex lens, the polarizer and the quarter glass slide are arranged in sequence along the same optical axis and along the transmission direction of light;
the polarization characteristic detection receiving optical subsystem comprises a hemispherical lens, a beam reducer, a narrow-band filter, a second biconvex lens and a polarization state measuring instrument, wherein the hemispherical lens, the beam reducer, the narrow-band filter, the second biconvex lens and the polarization state measuring instrument are coaxial and are sequentially arranged along the propagation direction of light;
the polarization information passive transmission test system comprises an infrared polarized light generating subsystem and an infrared polarization characteristic detecting subsystem, wherein the infrared polarized light generating subsystem and the infrared polarization characteristic detecting subsystem are respectively arranged on two sides of a sea fog medium, the infrared polarized light generating subsystem comprises a black body standard infrared light source and a metal wire grating polaroid, the metal wire grating polaroid and the black body standard infrared light source are coaxial, and the metal wire grating polaroid is arranged on an emergent light path of the black body 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 active and passive testing method for the polarized light transmission characteristic in the complex sea fog environment is characterized in that the method adopts the active and passive testing system for the polarized light transmission characteristic in the complex sea fog environment to test, and specifically comprises the following steps:
adjusting a first two-dimensional angle adjusting platform and a second two-dimensional angle adjusting platform to align a polarized light emitting optical subsystem and a polarization characteristic detection receiving optical subsystem;
turning on an ultra-wide band tunable laser in the polarized light emission optical subsystem, and emitting a laser beam emitted by the ultra-wide band tunable laser after sequentially passing through an attenuation sheet, a first biconvex lens, a polarizer and a quarter glass slide to obtain polarized light and irradiating the polarized light to a sea fog medium;
emitting polarized light from the sea fog medium, and then irradiating the polarized light to a polarization characteristic detection receiving optical subsystem;
the polarization characteristic detection receiving optical subsystem receives the polarized light which is emitted from the sea fog medium and carries the sea fog information, the polarized light which carries the sea fog information is emitted after sequentially passing through a hemispherical lens, a beam reducer, a narrow-band filter, a second biconvex lens and a polarization state measuring instrument, and enters a polarization information calculation processing subsystem;
the polarization information calculation processing subsystem receives the light beam emitted by the optical subsystem after polarization characteristic detection and receives, and performs polarized light mode identification and processing to obtain polarized light information after the polarized light is transmitted through the sea fog environment;
step six, repeating the step one to the step five, testing the polarization characteristics of different wave bands of the transmission characteristics under different sea fog environment conditions, observing the change condition of the polarization characteristics of the laser beam after the laser beam is transmitted through the sea fog environment, and analyzing the change of the polarization characteristics of the laser beam under the sea fog environment;
seventhly, starting a black body standard infrared light source in the infrared polarized light generating subsystem, enabling infrared light emitted by the black body standard infrared light source to enter a metal wire grid polarizing film, emitting the infrared light through the metal wire grid polarizing film to obtain infrared polarized light, and emitting the infrared polarized light to the sea fog medium in the step one;
emitting infrared polarized light from the sea fog medium and then irradiating the infrared polarized light to an infrared polarization characteristic detection subsystem for 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 polarization imaging on the target in different sea fog environments within a certain visual range, comparing the obtained result with the polarization imaging of the zero-visual-range target, and analyzing the transmission characteristics of the infrared polarization 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 in the complex sea fog environment.
The polarized light information comprises a polarized light stokes vector, a polarization degree and a polarization angle.
Through the design scheme, the invention can bring the following beneficial effects: the polarized light emitting optical subsystem established by the invention can generate polarized light beams with different wavelengths, and the polarized light beams can penetrate through sea fog media with different distances and different visibility, so that the polarized transmission characteristics of the polarized light with different wavelengths in a complex sea fog environment 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 the polarized light information penetrating through the sea fog medium, such as parameters of output stokes vectors, polarization degree, polarization angle and the like, thereby analyzing the polarization transmission characteristic of the polarized light in a complex sea fog environment; the polarization characteristic detection receiving optical subsystem constructed by the invention can acquire polarization information corresponding to different wavelength filtering light after being transmitted in complex sea fog environments with different visibility by replacing the optical filters with different wavelengths. The passive transmission test of the transmission influence of polarized light with different wavelengths in different distances and different sea fog environments is carried out simultaneously, infrared polarized light with different wave bands is generated by utilizing a black body standard infrared light source and a metal wire grid polaroid, an infrared polarization imaging method is adopted, polarization imaging is carried out on a typical target in different environments within a certain visual range, the obtained result is compared with zero-visual-range target polarization imaging, and the transmission characteristic of infrared polarization information of the target at different distances is analyzed. And the polarization characteristic of the transmission line is tested under different environmental conditions, and passive transmission imaging experimental research is carried out on a complex sea fog environment. Therefore, the mutual complementation verification of the transmission characteristics of the active polarization and the passive polarization is realized, and the accuracy and the reliability of the analysis of the test result are improved. A certain theoretical and technical foundation is laid for realizing polarization information transmission and polarization target detection capability improvement in a complex sea fog environment.
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The invention will be further described with reference to the following description and embodiments in conjunction with the accompanying drawings:
fig. 1 is a schematic diagram of a polarization information active transmission test system in the polarized light transmission characteristic active and passive test system under a complex sea fog environment.
Fig. 2 is a schematic view showing a composition of a polarized information passive transmission test system of the polarized light transmission characteristic active and passive test system in a complex sea fog environment according to an embodiment of the present invention.
Fig. 3 is a schematic diagram of a polarization information passive transmission test system of the polarized light transmission characteristic active and passive test system in the complex sea fog environment according to the embodiment of the invention.
Fig. 4 is a third schematic diagram illustrating a polarization information passive transmission test system of the polarized light transmission characteristic active and passive test system in the complex sea fog environment according to the embodiment of the present invention.
In the figure: 1-a polarized light emitting optical subsystem; 2-a first two-dimensional angle adjustment platform; 3-a polarization characteristic detection receiving optical subsystem; 4-a second two-dimensional angle adjustment platform; 5-polarization information calculation processing subsystem; a 6-infrared polarized light generating subsystem; 7-an infrared polarization characteristic detection subsystem; 8-ultra-wideband tunable lasers; 9-an attenuation sheet; 10-a first biconvex lens; 11-a polarizer; 12-quarter slide; 13-hemispherical lens; 14-a beam reducer; 15-narrow band filters; 16-a second biconvex lens; 17-a polarization state measuring instrument; 18-blackbody standard infrared source; 19-a metal wire grid polarizer; 20-short wave infrared polarization detector; 21-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 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 is not to be taken as limiting the scope of the invention. Unless defined otherwise, technical or scientific terms used herein shall have 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 is to be understood that the terms "first" and "second" are used for descriptive purposes only and that the features defined as "first" and "second" do not denote any order, quantity, or importance, but rather are used to distinguish one element from another.
Firstly, carrying out active transmission tests on transmission influence of polarized light with different wavelengths in different distances and different sea fog environments, establishing test systems by adopting lasers with different wavelengths and different types, carrying out collimation and beam expansion through an emission optical system, respectively modulating a polarizer 11 and a quarter glass 12 into linearly polarized light with horizontal line polarization or vertical line polarization and circularly polarized light with left rotation or right rotation by using a polarization modulation method to generate polarized light with different wave bands, and transmitting the polarized light through sea fog; and a polarization state measuring instrument 17 is used for detecting at a receiving end, testing the transmission characteristics of the laser in different wave bands under different environmental conditions, and observing the change condition of the polarization characteristics of the laser after sea fog transmission, so that the change of the polarization characteristics of the laser in the sea fog environment is analyzed. And meanwhile, carrying out passive transmission tests on the transmission influence of polarized light with different wavelengths in different distances and different sea fog environments, generating infrared polarized light with different wave bands by using a black body standard infrared light source 18 and a metal wire grid polarizing plate 19, carrying out polarization imaging on a typical target in a certain visual distance and in different environments by adopting an infrared polarization imaging method, comparing the obtained result with the polarization imaging of a zero-visual-distance target, and analyzing the transmission characteristics of infrared polarization information of the target at different distances. And the polarization characteristic of the transmission line is tested under different environmental conditions, and passive transmission imaging experimental research is carried out on a complex sea fog environment. Therefore, the mutual complementation verification of the transmission characteristics of the active polarization and the passive polarization is realized, and the accuracy and the reliability of the analysis of the test result are improved.
The active and passive test system for polarized light transmission characteristics in a complex sea fog environment is characterized by comprising 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 receiving optical subsystem 3 is arranged on the second two-dimensional angle adjusting platform 4, and meanwhile, the polarization characteristic detection receiving optical subsystem 3 is electrically connected with the polarization information calculation processing subsystem 5; the first two-dimensional angle adjusting platform 2 and the second two-dimensional angle adjusting platform 4 are used for controlling the alignment between the polarized light emitting optical subsystem 1 and the polarization characteristic detection receiving optical subsystem 3, and ensuring that parallel light beams emitted by the polarized light emitting optical subsystem 1 are parallelly incident to the polarization characteristic detection receiving optical subsystem 3 after passing through a sea fog medium;
the polarized light emission optical subsystem 1 comprises an ultra-wide band tunable laser 8, an attenuation sheet 9, a first biconvex lens 10, a polarizer 11 and a quarter glass slide 12, wherein the ultra-wide band tunable laser 8, the attenuation sheet 9, the first biconvex lens 10, the polarizer 11 and the quarter glass slide 12 are coaxial and are sequentially arranged along the propagation direction of light; the ultra-wideband tunable laser 8 is used for emitting laser beams in different modes, and the ultra-wideband tunable laser 8 adopts a Russian Tekhnoscan model-T & D-scan ultra-wideband tunable laser; the attenuation sheet 9 adopts a UV-NIR model attenuation sheet of ItemMonte optics (Shenzhen) Limited company; the first biconvex lens 10 adopts a model #32-023 biconvex lens of Itemner Monte optics (Shenzhen) Limited company; the polarizer 11 adopts a model #54-204 polarizer of Itemmonte optics (Shenzhen) Limited; the quarter-slide 12 adopts an N-BK7 model quarter-slide of Itemner optical (Shenzhen) Limited company;
the polarization characteristic detection receiving 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 coaxial and are sequentially arranged along the propagation direction of light; the hemispherical lens 13 adopts an S-LAH79 model hemispherical lens of ItemMonte optics (Shenzhen) Limited; the beam reducer 14 adopts a VEX series type beam reducer of Lithuana Optogama company; the narrow-band filter 15 adopts a model #46-547 narrow-band filter of Itemnt Monte optics (Shenzhen) Limited company; the second biconvex lens 16 adopts a model #32-023 biconvex lens of Itemner Monte optics (Shenzhen) Limited company; the polarization state measuring instrument 17 is a PAX1000IR1 polarization state measuring instrument of Thorlabs company in USA;
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 passes through an attenuation sheet 9, a first biconvex lens 10, a polarizer 11 and a quarter glass 12 in sequence to complete polarization and polarized light mode control; the light beam received by the polarization characteristic detection receiving optical subsystem 3 passes through 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 in sequence to finish the polarization detection of the received polarized light beam; and the polarization information is subjected to pattern recognition and calculation processing through the polarization information calculation processing subsystem 5.
The polarization information passive transmission testing system comprises an infrared polarized light generating subsystem 6 and an infrared polarization characteristic detecting subsystem 7, wherein the infrared polarized light generating subsystem 6 and the infrared polarization characteristic detecting subsystem 7 are respectively arranged on two sides of a sea fog medium, the infrared polarized light generating subsystem 6 comprises a black body standard infrared light source 18 and a metal wire grid polaroid 19, the black body standard infrared light source 18 is used for generating infrared light with different wave bands, the metal wire grid polaroid 19 and the black body standard infrared light source 18 are coaxial, and the metal wire grid polaroid 19 is arranged on an emergent light path of the black body standard infrared light source 18; the infrared polarization characteristic detection subsystem 7 comprises a short wave infrared polarization detector 20, a medium wave infrared polarization detector 21 and a long wave infrared polarization detector 22, wherein the short wave infrared polarization detector 20, the medium wave infrared polarization detector 21 and the long wave infrared polarization detector 22 are used for correspondingly receiving infrared polarized light with different wavelengths emitted by the infrared polarized light generation subsystem 6 and are independent from each other. If the infrared polarized light of the short wave band is emitted by the infrared polarized light generating subsystem 6, a short wave infrared polarization detector 20 is adopted, which is detailed in fig. 2; the infrared polarized light of the middle waveband emitted by the infrared polarized light generating subsystem 6 adopts a middle wave infrared polarization detector 21, which is shown in detail in fig. 3; the long-wave infrared polarization detector 22 is adopted for the infrared polarized light of the middle wave band emitted by the infrared polarized light generating subsystem 6, and the detailed description is shown in fig. 4; the black body standard infrared light source 18 adopts an EMIRS50 model black body standard infrared light source of Axietris company of Switzerland; the metal wire grid polarizer 19 is a VLS-100-UV model metal wire grid polarizer of Meadownlark optics, USA; the short-wave infrared polarization detector 20 adopts a Bobcat-640-GigE model short-wave infrared polarization detector of Belgium Xeronics company; the medium wave infrared polarization detector 21 adopts a Tigris-640 model medium wave infrared detector of Xenics; the long-wave infrared polarization detector 22 adopts a Gobi-640-GigE model long-wave infrared polarization detector of Xenic company.
The active and passive testing method for the polarized light transmission characteristic in the complex sea fog environment is characterized in that the method adopts the active and passive testing system for the polarized light transmission characteristic in the complex sea fog environment to test, and specifically comprises the following steps:
step one, adjusting a first two-dimensional angle adjusting platform 2 and a second two-dimensional angle adjusting platform 4 to enable a polarized light emitting optical subsystem 1 and a polarization characteristic detection receiving optical subsystem 3 to be aligned;
turning on an ultra-wide band tunable laser 8 in the polarized light emission optical subsystem 1, wherein a laser beam emitted by the ultra-wide band tunable laser 8 passes through an attenuation sheet 9, a first biconvex lens 10, a polarizer 11 and a quarter glass sheet 12 in sequence to complete polarization and polarized light mode control to obtain polarized light, and the polarized light emitted by the quarter glass sheet 12 is emitted to a sea fog medium;
emitting polarized light from the sea fog medium, and then irradiating the emitted polarized light to a polarization characteristic detection receiving optical subsystem 3;
step four, the polarization characteristic detection receiving optical subsystem 3 receives the polarized light which is emitted from the sea fog medium and carries the sea fog information, the polarized light which carries the sea fog information sequentially passes through 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 to complete receiving and analyzing polarization of the polarized light, and the polarized light after analyzing polarization enters a polarization information calculation processing subsystem 5;
fifthly, the polarization information calculation processing subsystem 5 receives the light beam emitted by the polarization characteristic detection receiving optical subsystem 3, and performs polarized light mode identification and processing to obtain polarized light information after the polarized light is transmitted through the sea fog environment; the polarized light information comprises a polarized light stokes vector, a polarization degree and a polarization angle;
step six, repeating the step one to the step five, testing the polarization characteristics of different wave bands of the transmission characteristics under different sea fog environment conditions, observing the change condition of the polarization characteristics of the laser beam after the laser beam is transmitted through the sea fog environment, and analyzing the change of the polarization characteristics of the laser beam under the sea fog environment;
seventhly, starting the black body standard infrared light source 18 in the infrared polarized light generating subsystem 6, enabling infrared light emitted by the black body standard infrared light source 18 to be incident to the metal wire grid polarizing plate 19, and obtaining infrared polarized light after being emitted by the metal wire grid polarizing plate 19 and emitting the infrared polarized light to the sea fog medium in the step one;
emitting infrared polarized light from the sea fog medium and then irradiating the infrared polarized light to an infrared polarization characteristic detection subsystem 7 for infrared polarization imaging;
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 polarization imaging on the target in different sea fog environments within a certain visual range, comparing the obtained result with the polarization imaging of the zero-visual-range target, and analyzing the transmission characteristics of the infrared polarization information of the target at different distances; carrying out polarization characteristic test on the transmission characteristic of the artificial sea fog under different environmental conditions, and carrying out passive transmission imaging test research on the complex sea fog environment;
and step ten, combining the step six and the step nine to obtain the polarized light transmission characteristic in the complex sea fog environment.
Claims (4)
1. The active and passive test system for polarized light transmission characteristics in a complex sea fog environment is characterized by comprising a polarized information active transmission test system and a polarized information passive transmission test system,
the active polarization information 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 receiving optical subsystem (3) is arranged on the second two-dimensional angle adjusting platform (4), and meanwhile, the polarization characteristic detection receiving optical subsystem (3) is electrically connected with the polarization information calculation processing subsystem (5); the first two-dimensional angle adjusting platform (2) and the second two-dimensional angle adjusting platform (4) are used for controlling the alignment between the polarized light emitting optical subsystem (1) and the polarization characteristic detecting and receiving optical subsystem (3) and ensuring that parallel light beams emitted by the polarized light emitting optical subsystem (1) are parallelly incident to the polarization characteristic detecting and receiving optical subsystem (3) after passing through a sea fog medium;
the polarized light emission optical subsystem (1) comprises an ultra-wide band tunable laser (8), an attenuation sheet (9), a first biconvex lens (10), a polarizer (11) and a quarter glass slide (12), wherein the ultra-wide band tunable laser (8), the attenuation sheet (9), the first biconvex lens (10), the polarizer (11) and the quarter glass slide (12) are coaxial and are sequentially arranged along the propagation direction of light;
the polarization characteristic detection receiving optical subsystem (3) comprises a hemispherical lens (13), a beam reducer (14), a narrow band 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 filter (15), the second biconvex lens (16) and the polarization state measuring instrument (17) are coaxial and are sequentially arranged along the propagation direction of light;
the polarization information passive transmission testing system comprises an infrared polarized light generating subsystem (6) and an infrared polarization characteristic detecting subsystem (7), wherein the infrared polarized light generating subsystem (6) and the infrared polarization characteristic detecting subsystem (7) are respectively arranged on two sides of a sea fog medium, the infrared polarized light generating subsystem (6) comprises a black body standard infrared light source (18) and a metal wire grid polarizing plate (19), the metal wire grid polarizing plate (19) and the black body 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 black body standard infrared light source (18); the infrared polarization characteristic detection subsystem (7) comprises a short wave infrared polarization detector (20), a medium wave infrared polarization detector (21) and a long wave infrared polarization detector (22), wherein the short wave infrared polarization detector (20), the medium wave infrared polarization detector (21) and the long wave infrared polarization detector (22) are used for correspondingly receiving infrared polarized light with different wavelengths emitted by the infrared polarized light generation subsystem (6) and are independent from each other.
2. The active and passive test system for polarized light transmission characteristics in a complex sea fog environment according to claim 1, wherein: the attenuator (14) is a variable magnification attenuator.
3. The active and passive testing method for the polarized light transmission characteristic in the complex sea fog environment is characterized in that the method adopts the active and passive testing system for the polarized light transmission characteristic in the complex sea fog environment as claimed in claim 1 or 2 to carry out testing, and specifically comprises the following steps:
adjusting a first two-dimensional angle adjusting platform (2) and a second two-dimensional angle adjusting platform (4) to align a polarized light emitting optical subsystem (1) and a polarization characteristic detecting and receiving optical subsystem (3);
secondly, starting an ultra-wide band tunable laser (8) in the polarized light emission optical subsystem (1), and emitting laser beams emitted by the ultra-wide band tunable laser (8) after sequentially passing 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, emitting polarized light from the sea fog medium, and then irradiating the polarized light to a polarization characteristic detection receiving optical subsystem (3);
step four, the polarization characteristic detection receiving optical subsystem (3) receives polarized light which is emitted from the sea fog medium and carries sea fog information, the polarized light which carries the sea fog information is emitted after sequentially passing through 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), and enters a polarization information calculation processing subsystem (5);
fifthly, the polarization information calculation processing subsystem (5) receives the light beam emitted by the polarization characteristic detection receiving optical subsystem (3), and performs polarized light mode identification and processing to obtain polarized light information transmitted by polarized light in a sea fog environment;
step six, repeating the step one to the step five, testing the polarization characteristics of different wave bands of the transmission characteristics under different sea fog environment conditions, observing the change condition of the polarization characteristics of the laser beam after the laser beam is transmitted through the sea fog environment, and analyzing the change of the polarization characteristics of the laser beam under the sea fog environment;
seventhly, starting a black body standard infrared light source (18) in the infrared polarized light generating subsystem (6), enabling infrared light emitted by the black body standard infrared light source (18) to be incident to a metal wire grid polarizing plate (19), emitting the infrared light through the metal wire grid polarizing plate (19) to obtain infrared polarized light, and emitting the infrared polarized light to the sea fog medium in the step one;
emitting infrared polarized light from the sea fog medium and then irradiating the infrared polarized light to an infrared polarization characteristic detection subsystem (7) for infrared polarization imaging;
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 polarization imaging on the target in different sea fog environments within a certain visual range, comparing the obtained result with the polarization imaging of the zero-visual-range target, and analyzing the transmission characteristics of the infrared polarization 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 in the complex sea fog environment.
4. The active and passive testing method for the transmission characteristic of the polarized light in the complex sea fog environment according to claim 3, characterized in that: the polarized light information comprises a polarized light stokes vector, a polarization degree and a polarization angle.
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