Polarization transmission testing device and method for simulating complex sea fog environment

Abstract

The invention belongs to the field of polarization optical transmission and detection. The invention provides a polarization transmission testing device and a polarization transmission testing method for simulating a complex sea fog environment, aiming at solving the problems of unclear seeing, undistant recognition, difficulty in testing and the like during ocean exploration and building an indoor semi-physical simulation platform to research polarization transmission characteristics in the complex sea fog environment. The device comprises a polarized light generation module, a horizontal adjustable rotating table, a complex medium optical environment module and a polarized light receiving and measuring module. The polarized light generation module is used for generating and emitting polarized light with a certain wavelength and a certain polarization state; the horizontal adjustable rotating table is used for adjusting azimuth angle information of emitted polarized light; the complex medium optical environment module is used for simulating an actual medium particle environment above the near sea level; and the polarized light receiving and measuring module is used for measuring and analyzing the received polarized light. And the parameter information is substituted into a Monte Carlo program for analogue simulation to obtain the polarization transmission characteristic of the polarized light transmitted in the complex sea fog environment, so that the simulation of the complex sea fog environment system and the test of the polarization transmission characteristic in the environment are of great significance.

Description

Technical Field

[0001] The invention belongs to the field of polarization optical transmission and detection, and in particular relates to a polarization transmission test device and method for simulating a complex sea fog environment. Background Art

[0002] With the continuous development of the field of optical detection, the application of optical transmission and detection in near-marine medium environment is becoming more and more extensive. However, in fact, bad weather is very likely to occur at the sea level, which often leads to problems such as data information loss, low visibility, and large data errors during outdoor field surveys.

[0003] In recent years, many scholars have built indoor semi-physical simulation platforms to study the transmission characteristics of polarized light in response to the problems of unclear vision, short range and difficult testing in outdoor near-sea plane optical detection. However, due to the wide variety of dielectric particles above the sea plane, accurate polarization transmission characteristics cannot be obtained by simulating only a single dielectric particle environment. At the same time, due to limitations of indoor venues and other factors, the semi-physical simulation platform only has incident polarized light in the vertical direction, which makes it impossible to transmit the laser over long distances within the box, and the simulated experimental data often have large errors.

[0004] Therefore, in order to solve the problems caused by the short transmission distance of laser in indoor semi-physical simulation devices, the single incident azimuth angle, and the inaccurate simulated medium environment, a polarization transmission test device and method that simulates a complex sea fog environment is urgently needed. Summary of the invention

[0005] Aiming at the problem that existing indoor semi-physical simulation devices cannot accurately simulate the actual outdoor survey environment, the present invention proposes a polarization transmission test device and method for simulating a complex sea fog environment.

[0006] The technical scheme adopted by the present invention to achieve the above-mentioned purpose is as follows: a polarization transmission test device and method for simulating a complex sea fog environment, characterized in that it includes: a polarized light generating module, a horizontally adjustable rotating stage, a complex medium optical environment module and a polarized light receiving and measuring module, wherein the horizontally adjustable rotating stage can change the limited single vertical incident direction, and give the emitted polarized light more abundant azimuth information, so as to facilitate more accurate simulation of the outdoor experimental environment; the polarized light generating module is used to generate and emit polarized light of different wavelengths and different polarization states, and is located directly above the horizontally adjustable rotating stage in the vertical direction; the complex medium optical environment module includes a three-layer experimental simulation box, and the interior of the box is used to simulate the actual complex medium above the sea level. A mixed medium particle environment, three layers of boxes are arranged in sequence along the direction perpendicular to the optical path, an optical transmission channel is provided between every two adjacent boxes, and optical transmission channels are also provided at the bottom of the first layer of boxes and the top of the third layer of boxes from bottom to top for optical path transmission, and reflectors are provided on both sides of the side walls of each layer of boxes for increasing the transmission distance of the optical path, and salt spray generators, water spray generators, aerosol generators, temperature sensors, humidity sensors and Malvern particle size analyzers are provided on the outside of each layer of boxes that are interconnected with each other; the polarized light receiving and measuring module is arranged directly above the complex medium optical environment module in the direction perpendicular to the optical path, and is used for real-time measurement and analysis of the received polarized light, so as to obtain the polarization characteristics of the polarized light after being transmitted through the complex medium environment.

[0007] Furthermore, the polarized light generating module is composed of a laser, a collimator, an attenuation plate, a linear polarizer and a λ / 4 wave plate which are arranged vertically in sequence.

[0008] Furthermore, the complex medium optical environment module consists of a salt spray medium simulation layer, a water mist medium simulation layer and an aerosol medium simulation layer arranged in sequence along the vertical optical path direction; a salt spray generator connected to the salt spray medium simulation layer is provided outside the salt spray medium simulation layer, a water mist generator connected to the water mist medium simulation layer is provided outside the water mist medium simulation layer, and an aerosol generator connected to the aerosol medium simulation layer is provided outside the aerosol medium simulation layer; optical transmission channels are provided on the upper and lower sides of each layer of the box, reflectors are provided on both sides of the side walls of each layer of the box, and a temperature sensor, a humidity sensor and a Malvern particle size analyzer connected to the inside of the box are provided outside each layer of the box.

[0009] Furthermore, the polarized light receiving and measuring module includes a beam splitter, a polarization state measuring instrument, an optical power meter and a computer processing system. The beam splitter is arranged at a position directly above the vertical direction of the outgoing light path, the polarization state measuring instrument and the optical power meter are respectively located directly above the vertical direction and directly to the right of the beam splitter in the horizontal direction, and both the polarization state measuring instrument and the optical power meter are connected to the computer processing system.

[0010] Furthermore, the polarized light generating module is used to generate and emit polarized light containing different polarization information. The polarized light generating module includes a laser, a collimator, an attenuation plate, a linear polarizer and a λ / 4 wave plate. The laser is used to change the wavelength variable so that the incident polarized light has different wavelength information, which is used to study the polarization transmission characteristics when only the wavelength variable is changed. The collimator can adjust the direction and shape of the laser beam so that the polarized light at the receiving end is received with maximum efficiency. The attenuation plate is used to attenuate the power of the laser at the transmitting end to avoid damage to the receiving end device caused by the large laser power. The linear polarizer is used to convert the laser into linear polarized light so that the incident polarized light has different linear polarization information. The λ / 4 wave plate is used to convert the incident linear polarized light into left-handed or right-handed circularly polarized light.

[0011] Furthermore, the complex medium optical environment module is used to simulate the actual medium particle environment above the sea level. The complex medium optical environment module includes a salt fog medium simulation layer, a water mist medium simulation layer and an aerosol medium simulation layer. The salt fog medium simulation layer is filled with salt fog medium particles through a salt fog generator to simulate the salt fog medium environment above the sea level. The water fog medium simulation layer is filled with water fog medium particles through a water fog generator to simulate the water fog medium environment above the sea level. The aerosol medium simulation layer is filled with aerosol medium particles through an aerosol generator to simulate the atmospheric aerosol environment above the sea level.

[0012] Furthermore, the optical transmission channel is used for laser transmission, and the optical transmission channels are arranged vertically in sequence in the direction of light path propagation. The light beam emitted by the polarized light generating module enters the salt spray medium simulation layer through the optical transmission channel, is transmitted through the complex medium optical environment module, is transmitted through the optical transmission channel at the top of the aerosol medium simulation layer, and enters the polarized light receiving and measuring module.

[0013] Furthermore, the reflector is used to emit the incident polarized light at a certain angle. The reflector is arranged on both sides of the inner side walls of each layer of the box. When the light beam entering the box reaches the reflector, the reflector emits it at a certain angle, so that the transmission distance of the light beam in the box is increased and the light beam is transmitted in a non-vertical direction.

[0014] Furthermore, the temperature sensor is used to set and monitor the internal temperature of the box in real time, so as to more accurately simulate the medium particle environment above the outdoor sea level.

[0015] Furthermore, the humidity sensor is used to set and monitor the humidity inside the box in real time, so as to more accurately simulate the medium particle environment above the outdoor sea level.

[0016] Furthermore, the Malvern particle size analyzer is used to measure parameters such as particle size and density of medium particles inside the box. When the box is empty, the Malvern particle size analyzer is moved into the box and medium particles are filled into the box. The Malvern particle size analyzer measures the particle size parameter information inside the box.

[0017] Furthermore, the polarized light receiving and measuring module is used to receive polarized light emitted after being transmitted by the complex medium optical environment module. The polarized light receiving and measuring module includes a beam splitter, a polarization state measuring instrument, an optical power meter and a computer processing system. The beam splitter is used to split the received polarized light into two completely identical vertical light beams, one beam enters the polarization state measuring instrument, and the other beam enters the optical power meter. The polarization state measuring instrument is used to measure and analyze the received polarized light and obtain information such as the polarization state and polarization degree. The optical power meter is used to measure the light intensity information of the received polarized light.

[0018] A polarization transmission test device and method for simulating a complex sea fog environment specifically comprises the following steps:

[0019] S1. Prepare required salt spray medium particles, water mist medium particles and aerosol medium particles;

[0020] S2. Build the transmitting end experimental device platform, place the horizontally adjustable rotating table, laser, collimator, attenuator, linear polarizer and λ / 4 wave plate in sequence along the vertical direction, and calibrate the transmitting end optical devices;

[0021] S3. Build a receiving end experimental device platform, place a beam splitter prism along the vertical direction of the optical path, place a polarization state measuring instrument just above the beam splitter prism in the vertical direction, and place an optical power meter just to the right of the beam splitter prism in the horizontal direction. Both the polarization state measuring instrument and the optical power meter are connected to the computer processing system;

[0022] S4. Turn on the main power supply of the complex medium optical environment module to ensure that all parts of the box are in normal working condition;

[0023] S5, turn on the laser of the polarized light generating module and emit the laser, the light beam is transmitted through the complex medium optical environment module and then enters the polarized light receiving and measuring module, at which time the optical power meter measures the light intensity value of the polarized light when the box is empty;

[0024] S6, turning on the salt spray generator, water mist generator and aerosol generator of the complex medium optical environment module, respectively filling the salt spray medium simulation layer, the water mist medium simulation layer and the aerosol medium simulation layer with salt spray medium particles, water mist medium particles and aerosol medium particles, ensuring that the time for filling the medium particles between the layers is the same, and observing and measuring the light intensity value of the polarized light after transmission through the complex medium;

[0025] S7, obtaining the optical thickness of the complex medium particle environment through the light intensity information of the outgoing light in the empty box state obtained in S5 and the light intensity information of the outgoing light in the case of filling with medium particles obtained in S6;

[0026] S8, emptying the medium particles in each layer of the box, moving each layer of Malvern particle size analyzer into each layer of the box, turning on the salt spray generator, water mist generator and aerosol generator of the complex medium optical environment module, respectively filling the salt spray medium simulation layer, water mist medium simulation layer and aerosol medium simulation layer with salt spray medium particles, water mist medium particles and aerosol medium particles, and ensuring that the filling time is the same as the filling time of the medium particles in S6, and obtaining the particle size parameter information of each layer of medium particles by the Malvern particle size analyzer;

[0027] S9, finding the refractive index of the dielectric particles inside the box in S6, and sequentially substituting the polarized light wavelength emitted by the laser in the polarized light generating module, the polarization state of the incident polarized light, the refractive index of the dielectric particles, the particle sizes measured by three Malvern particle sizers, and the optical thickness of the complex dielectric particle environment into the Monte Carlo simulation program for computer simulation of the polarization degree value of the polarized light after being transmitted through the complex dielectric environment;

[0028] S10, empty the medium particles in each layer of the box, and remove the Malvern particle size analyzer from each layer of the box, turn off the polarized light generating module and the polarized light receiving and measuring module, turn off the main power supply of the complex medium optical environment module, and the experimental simulation test is completed.

[0029] Furthermore, the laser in S2 can emit lasers of different wavelengths, and multiple repeated experiments can be performed on the premise of changing only the wavelength variable to study the polarized light transmission characteristics at different wavelengths. The linear polarizer can generate linear polarized light at different angles, and the λ / 4 wave plate can generate left-handed or right-handed circularly polarized light. When the emission wavelength of the exciter remains unchanged, the polarized light transmission characteristics at the same incident wavelength and different polarization states can be obtained by adjusting the linear polarizer and the λ / 4 wave plate. The horizontally adjustable rotating stage can change the original single vertical incident light path so that the incident polarized light has azimuth information. The polarized light incident at an oblique angle enters the interior of the box and is reflected by a reflector to extend the transmission path of the light beam, which is used to study the polarization transmission characteristic information after the polarized light is incident at a certain oblique angle.

[0030] Furthermore, the time for filling the dielectric particles in S6 can be regulated according to the concentration of the dielectric particles, and the polarization transmission characteristics in a two-layer dielectric particle environment can be simulated according to experimental needs, and the other layer can be kept in an empty box state. The temperature and humidity inside the box can be regulated and monitored by a temperature sensor and a humidity sensor to obtain a dielectric particle simulation environment that is closer to the actual sea level environment.

[0031] Furthermore, S7 can calculate the optical thickness τ in the box under the complex medium environment by using the light intensity of the emitted light I0 in the empty box state and the light intensity value of the emitted light I1 in the medium particle environment:

[0032]

[0033] Among them, I0 is the light intensity information of the emitted light in the empty box state, I1 is the light intensity information of the emitted light when each layer of the box is filled with dielectric particles, and τ is the optical thickness in a complex dielectric environment.

[0034] Through the above technical scheme, the present invention can bring the following beneficial effects: the present invention aims at the problems of unclear vision, short distance recognition and difficult testing in outdoor field photoelectric survey, and designs a polarization transmission test device and method for simulating complex sea fog environment. Since most of the existing devices only study the polarization light transmission characteristics in a single-layer medium particle environment, there are large errors to a certain extent. The present invention adds a multi-layer complex medium particle environment on the basis of the single-layer medium particle environment, and adds a reflector, a temperature sensor, a humidity sensor and a Malvern particle size analyzer, increases the transmission path of the light beam inside the box, can adjust and monitor the temperature and humidity inside the box in real time, and can measure parameter information such as the particle size and distribution of the medium particles inside each layer of the box. A horizontally adjustable rotating table is added directly below the transmitting device to change the original single vertical incidence mode, giving the emitted polarized light a richer azimuth angle, simulating the transmission characteristics of polarized light when the laser is incident at a certain tilt angle in the actual outdoor survey, and performing Monte Carlo simulation verification. The semi-physical indoor simulation device is more in line with the actual outdoor test environment, so that the accuracy of the simulation test results is improved, and the application range of the polarization transmission characteristics is expanded. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments:

[0036] Figure 1 This is a schematic diagram of the overall structure of a polarization transmission test device that simulates a complex sea fog environment;

[0037] Figure 2 It is a schematic diagram of a polarized light generating module device;

[0038] Figure 3 This is a schematic diagram of the complex medium optical environment module device;

[0039] Figure 4 Schematic diagram of the polarized light receiving and measuring module device.

[0040] 1. Polarized light generating module; 11. Laser; 12. Collimator; 13. Attenuator; 14. Linear polarizer; 15. λ / 4 wave plate;

[0041] 2. Horizontally adjustable rotating table;

[0042] 3. Complex medium optical environment module; 31. Salt spray medium simulation layer; 32. Water mist medium simulation layer; 33. Aerosol medium simulation layer; 34. Salt spray generator; 35. Water mist generator; 36. Aerosol generator; 37. Optical transmission channel I; 38. Optical transmission channel II; 39. Optical transmission channel III; 310. Optical transmission channel IV; 311. Reflector I; 312. Reflector II; 313. Reflector III; 314. Reflector IV; 315. Reflector V; 316. Reflector VI; 317. Temperature sensor I; 318. Humidity sensor I; 319. Malvern particle size analyzer I; 320. Temperature sensor II; 321. Humidity sensor II; 322. Malvern particle size analyzer II; 323. Temperature sensor III; 324. Humidity sensor III; 325. Malvern particle size analyzer III;

[0043] 4. Polarized light receiving and measuring module; 41. Spectral prism; 42. Polarization state measuring instrument; 43. Optical power meter; 44. Computer processing system. DETAILED DESCRIPTION

[0044] The present invention will be described more completely below with reference to the accompanying drawings and the following examples.

[0045] Example 1.

[0046] This embodiment proposes a polarization transmission test device and method for simulating a complex sea fog environment. Figure 1 As shown, it includes a polarized light generating module 1, a horizontally adjustable rotating platform 2, a complex medium optical environment module 3 and a polarized light receiving and measuring module 4;

[0047] The polarized light generating module 1 is used to generate polarized light of different wavelengths and different polarization states, and is used to study the polarization transmission characteristics of different wavelengths under the same polarization state or the polarization transmission characteristics of different polarization states under the same wavelength;

[0048] The horizontally adjustable rotating platform 2 is used to change the azimuth angle of polarized light emitted by the polarized light generating module 1, and the adjustable angle is 0° to 360°, and is used to change the vertical incident direction in the past, so that the incident polarized light is incident at a certain tilt angle;

[0049] The complex medium optical environment module 3 is used to simulate the actual external field medium particle environment above the sea level, and is used to study the polarization characteristics of polarized light after being transmitted through the complex medium particle environment;

[0050] The polarized light receiving and measuring module 4 is used to measure and analyze the polarized light obtained after being transmitted through the complex medium optical environment module 3 .

[0051] Example 2.

[0052] This embodiment is a further illustration of Example 1. Figure 2 As shown, the polarized light generating module 1 includes a laser 11, a collimator 12, an attenuation plate 13, a linear polarizer 14 and a λ / 4 wave plate 15;

[0053] The laser 11 is used to generate and emit lasers of different wavelength bands, the collimator 12 is used to adjust the direction and shape of the laser emitted by the laser 11 so that the laser is received with maximum efficiency, the attenuation plate 13 is used to attenuate the power of the laser at the transmitting end to avoid damage to the receiving end device due to excessive laser power, the linear polarizer 14 is used to convert the laser into linear polarized light, and the λ / 4 wave plate 15 is used to convert the linear polarized light into circularly polarized light.

[0054] Example 3.

[0055] This embodiment is a further illustration of Example 1. Figure 3 As shown, the complex medium optical environment module 3 includes a salt spray medium simulation layer 31, a water mist medium simulation layer 32, an aerosol medium simulation layer 33, a salt spray generator 34, a water mist generator 35, an aerosol generator 36, an optical transmission channel I 37, an optical transmission channel II 38, an optical transmission channel III 39, an optical transmission channel IV 310, a reflector I 311, a reflector II 312, a reflector III 313, a reflector IV 314, a reflector V 315, a reflector VI 316, a temperature sensor I 317, a humidity sensor I 318, a Malvern particle size analyzer I 319, a temperature sensor II 320, a humidity sensor II 321, a Malvern particle size analyzer II 322, a temperature sensor III 323, a humidity sensor III 324 and a Malvern particle size analyzer III 325;

[0056] The salt spray medium simulation layer 31 is used to simulate the salt spray medium environment above the sea level, the water mist medium simulation layer 32 is used to simulate the water mist medium environment above the sea level, the aerosol medium simulation layer 33 is used to simulate the atmospheric aerosol environment above the sea level, the salt spray generator 34 is used to generate and fill the salt spray medium particles into the box, the water mist generator 35 is used to generate and fill the water mist medium particles into the box, and the aerosol generator 36 is used to generate and fill the aerosol medium particles into the box;

[0057] The optical transmission channel I 37 is used to transmit the polarized light emitted by the polarized light generating module 1 to enter the box of the salt spray medium simulation layer 31, the optical transmission channel II 38 is used to transmit the outgoing polarized light in the box of the salt spray medium simulation layer 31 to enter the box of the water mist medium simulation layer 32, the optical transmission channel III 39 is used to transmit the outgoing polarized light in the box of the water mist medium simulation layer 32 to enter the box of the aerosol medium simulation layer 33, and the optical transmission channel IV 310 is used to transmit the outgoing polarized light in the box of the aerosol medium simulation layer 33 to enter the polarized light receiving and measuring module 4;

[0058] The reflector I 311, reflector II 312, reflector III 313, reflector IV 314, reflector V 315 and reflector VI 316 are used to reflect polarized light and increase the transmission path of polarized light inside each layer of the box;

[0059] The temperature sensor I317, temperature sensor II320 and temperature sensor III323 are used for real-time adjustment and monitoring of the temperature conditions inside the corresponding layers of the box. The humidity sensor I318, humidity sensor II321 and humidity sensor III324 are used for real-time adjustment and monitoring of the humidity conditions inside the corresponding layers of the box. The Malvern particle size analyzer I319, Malvern particle size analyzer II322 and Malvern particle size analyzer III325 are used to measure the particle size and distribution of the medium particles inside the corresponding layers of the box.

[0060] Example 4.

[0061] This embodiment is a further illustration of Example 1. Figure 4 As shown, the polarized light receiving and measuring module 4 includes a beam splitter prism 41, a polarization state measuring instrument 42, an optical power meter 43 and a computer processing system 44;

[0062] The beam splitter prism 41 is used to receive the outgoing polarized light after being transmitted by the complex medium optical environment module 3, and divide it into two completely identical and mutually perpendicular beams of light, one beam enters the polarization state measuring instrument 42, and the other beam enters the optical power meter 43. The polarization state measuring instrument 42 is used to measure and analyze the polarization state and polarization degree and other information of the received polarized light, and the optical power meter 43 is used to measure the light intensity information of the received polarized light.

[0063] Example 5.

[0064] This example is applied to the indoor semi-physical simulation experiment device as described in Examples 1-4, and the method includes the following steps:

[0065] S1. Prepare salt spray medium particles, water mist medium particles and aerosol medium particles to simulate the actual medium particle environment above the sea level;

[0066] S2, constructing a polarized light generating module 1 device platform so that the horizontally adjustable rotating table 2, the laser 11, the collimator 12, the attenuation plate 13, the linear polarizer 14 and the λ / 4 wave plate 15 are arranged in sequence in the vertical direction;

[0067] S3, build a polarized light receiving and measuring module 4 device platform, so that the beam splitter prism 41 is located directly above the aerosol medium simulation layer 33 box in the vertical direction, and the polarization state measuring instrument 42 and the optical power meter 43 are respectively placed directly above the beam splitter prism 41 in the vertical direction and directly to the right in the horizontal direction, and the polarization state measuring instrument 42 and the optical power meter 43 are connected to the computer processing system 44;

[0068] S4, turn on the main power supply of the complex medium optical environment module 3 box, check whether all parts of the box are in normal working condition, and calibrate the internal temperature and humidity of each layer of the box;

[0069] S5, turn on the laser 11 to emit laser, the laser passes through the collimator 12, the attenuation plate 13, the linear polarizer 14 and the λ / 4 wave plate 15 in sequence, and the polarized light enters the beam splitter 41 after passing through the complex medium optical environment module 3. The beam splitter 41 splits the polarized light into two completely identical and mutually perpendicular polarized lights, which enter the polarization state measuring instrument 42 and the optical power meter 43 respectively. At this time, the optical power meter 43 measures and obtains the light intensity value of the polarized light in the empty box state;

[0070] S6, filling corresponding dielectric particles into each layer of the box in the complex medium optical environment module 3 to simulate the actual dielectric particle environment above the sea level, the polarized light is emitted after being transmitted by the complex medium optical environment module 3, and is received by the polarized light receiving and measuring module 4. At this time, the optical power meter 43 measures and obtains the light intensity value of the polarized light in the complex medium particle environment;

[0071] S7, calculating the optical thickness in the complex medium particle environment by using the intensity value of the polarized light in the empty box state obtained in S5 and S6 and the intensity value of the polarized light in the complex medium particle environment;

[0072] S8, empty the medium particles inside each layer of the box and refill them with medium particles, and use Malvern particle size analyzer I319, Malvern particle size analyzer II322 and Malvern particle size analyzer III325 to measure the particle size and particle distribution information of the medium particles in each layer of the box;

[0073] S9, the wavelength of polarized light emitted by the laser 11 in the polarized light generating module 1, the polarization state of the incident polarized light, the refractive index of the medium particles, the particle size measured by Malvern particle sizer I 319, Malvern particle sizer II 322 and Malvern particle sizer III 325, and the optical thickness of the complex medium particle environment are sequentially substituted into the Monte Carlo simulation program to simulate the polarization value of the polarized light after being transmitted through the complex medium environment;

[0074] S10, empty the dielectric particles inside each layer of the box, return each component to its position, turn off each part of the polarized light generating module 1 and the polarized light receiving and measuring module 4, turn off the main power supply of the complex medium optical environment module 3, and the experimental simulation test is completed.

[0075] Example 6.

[0076] This example is a further illustration of Example 5, and the step S5 specifically includes:

[0077] S5.1. Change the wavelength of polarized light emitted by the laser 11 to explore the transmission characteristics of polarized light at different wavelengths in the same polarization state;

[0078] S5.2. Change the angle of the linear polarizer 14 to obtain linear polarized light of different polarization states, adjust the angle of the λ / 4 wave plate 15 to obtain left-handed circularly polarized light and right-handed circularly polarized light, and explore the transmission characteristics of polarized light of different polarization states at the same emission wavelength;

[0079] S5.3. Adjust the angle of the horizontally adjustable rotating table 2 to change the azimuth angle of the original vertically incident polarized light so that it enters the complex medium optical environment module 3 at a certain angle. At this time, the polarized light is incident on the reflector Ⅰ311 inside the box of the salt mist medium simulation layer 31, and is reflected on the reflector Ⅱ312. The outgoing polarized light reflected by the reflector Ⅱ312 enters the water mist medium simulation layer 32 through the optical transmission channel Ⅱ38, and is incident on the reflector Ⅲ313 inside the box of the water mist medium simulation layer 32, and so on, which is used to increase the transmission path of the polarized light in each layer of the box.

[0080] Example 7.

[0081] This example is a further illustration of Example 5, and the step S6 specifically includes:

[0082] S6.1, placing the prepared salt spray medium particles, water mist medium particles and aerosol medium particles in the salt spray generator 34, the water mist generator 35 and the aerosol generator 36 respectively;

[0083] S6.2, turn on the salt spray generator 34, the water mist generator 35 and the aerosol generator 36 in the complex medium optical environment module 3, so that the salt spray medium simulation layer 31, the water mist medium simulation layer 32 and the aerosol medium simulation layer 33 are respectively filled with salt spray medium particles, water mist medium particles and aerosol medium particles;

[0084] S6.3. Ensure that the particle filling time of each box is the same.

[0085] Example 8.

[0086] This example is a further illustration of Example 5, and the step S7 specifically includes:

[0087] Calculate the optical thickness of complex media environments:

[0088]

[0089] Among them, I0 represents the intensity value of polarized light at the receiving end when the box is empty, I1 represents the intensity value of polarized light at the receiving end when each layer of the box is filled with corresponding dielectric particles, and τ represents the optical thickness of the complex dielectric environment.

[0090] Example 9.

[0091] This example is a further illustration of Example 5, and the step S8 specifically includes:

[0092] S8.1. Empty the medium particles in the boxes of the salt spray medium simulation layer 31, the water mist medium simulation layer 32 and the aerosol medium simulation layer 33, so that the inside of each layer of the box remains empty;

[0093] S8.2, Malvern particle size analyzer I 319, Malvern particle size analyzer II 322 and Malvern particle size analyzer III 325 are respectively moved into the boxes of the salt spray medium simulation layer 31, the water mist medium simulation layer 32 and the aerosol medium simulation layer 33;

[0094] S8.3, turn on the salt spray generator 34, the water mist generator 35 and the aerosol generator 36 in the complex medium optical environment module 3, and respectively fill the salt spray medium simulation layer 31, the water mist medium simulation layer 32 and the aerosol medium simulation layer 33 boxes with salt spray medium particles, water mist medium particles and aerosol medium particles, and ensure that the particle filling time of each box is the same;

[0095] S8.4. After the medium particles in each layer of the box tend to be stable, the Malvern particle size analyzer I 319, Malvern particle size analyzer II 322 and Malvern particle size analyzer III 325 respectively obtain parameter information such as the particle size of the medium particles inside the salt spray medium simulation layer 31, the water mist medium simulation layer 32 and the aerosol medium simulation layer 33.

[0096] Example 10.

[0097] This example is a further illustration of Example 5, and the step S10 specifically includes:

[0098] S10.1. Empty the medium particles in the boxes of the salt spray medium simulation layer 31, the water mist medium simulation layer 32 and the aerosol medium simulation layer 33, so that the interior of each box is restored to an empty box state;

[0099] S10.2, Malvern particle size analyzer I 319, Malvern particle size analyzer II 322 and Malvern particle size analyzer III 325 are respectively moved out to the outside of the salt spray medium simulation layer 31, the water mist medium simulation layer 32 and the aerosol medium simulation layer 33;

[0100] S10.3, clear the medium particles inside the salt spray generator 34, the water mist generator 35 and the aerosol generator 36, turn off the components in the polarized light generating module 1 and the polarized light receiving and measuring module 4, turn off the main power supply of the complex medium optical environment module 3, and the experimental simulation test is completed.

Claims

1. A polarization transmission test device and method for simulating a complex sea fog environment, characterized in that: The device comprises a polarized light generating module (1), a horizontally adjustable rotating platform (2), a complex medium optical environment module (3) and a polarized light receiving and measuring module (4); The polarized light generating module (1) is composed of a laser (11), a collimator (12), an attenuation plate (13), a linear polarizer (14) and a λ / 4 wave plate (15), which are arranged vertically in sequence in the direction of light transmission; The horizontally adjustable rotating table (2) is vertically placed directly below the laser (11), the collimator (12), the attenuation plate (13), the linear polarizer (14) and the λ / 4 wave plate (15). The horizontally adjustable rotating table (2) is used to adjust the azimuth angle of the emitted polarized light, thereby exploring the polarization transmission characteristics of multi-angle incident polarized light in a complex medium environment; The complex medium optical environment module (3) comprises a salt mist medium simulation layer (31), a water mist medium simulation layer (32) and an aerosol medium simulation layer (33), wherein the salt mist medium simulation layer (31), the water mist medium simulation layer (32) and the aerosol medium simulation layer (33) are arranged vertically in sequence in the direction of light path propagation, and the output polarized light of the previous layer is used as the input polarized light of the next layer, so as to simulate the transmission characteristics of polarized light in different complex medium environments; The polarized light receiving and measuring module (4) comprises a beam splitter prism (41), a polarization state measuring instrument (42), an optical power meter (43) and a computer processing system (44), and is used for measuring and analyzing received polarized light.

2. A polarization transmission test device and method for simulating a complex sea fog environment, characterized in that: The polarized light generating module (1) comprises a laser (11), a collimator (12), an attenuation plate (13), a linear polarizer (14) and a λ / 4 wave plate (15); The laser (11) is used to emit lasers of different wavelengths, and is used to explore the changing rules of polarization characteristics under the same polarization state at different wavelengths. The collimator (12) is used to shape the laser emitted by the laser (11) into parallel light, so as to facilitate the entry into other optical devices. The attenuation plate (13) is used to attenuate the power of the emitted laser, and to prevent the excessive laser power from causing damage to the optical device at the receiving end. The linear polarizer (14) is used to convert the laser into linearly polarized light, and the λ / 4 wave plate (15) is used to convert the emitted linearly polarized light into circularly polarized light.

3. A polarization transmission test device and method for simulating a complex sea fog environment, characterized in that: The complex medium optical environment module (3) comprises a salt fog medium simulation layer (31), a water fog medium simulation layer (32), an aerosol medium simulation layer (33), a salt fog generator (34), a water fog generator (35), an aerosol generator (36), an optical transmission channel (I37), an optical transmission channel (II38), an optical transmission channel (III39), an optical transmission channel (IV310), a reflector (I311), a reflector (II312), a reflector (III313), a reflector (IV314), a reflector (V315), a reflector (VI316), a temperature sensor (I317), a temperature sensor (II320), a temperature sensor (III323), a humidity sensor (I318), a humidity sensor (II321), a humidity sensor (III324), a Malvern particle size analyzer (I319), a Malvern particle size analyzer (II322) and a Malvern particle size analyzer (III325); The salt mist generator (34) is used to fill the salt mist medium particles into the box of the salt mist medium simulation layer (31) to simulate the salt mist medium environment, the water mist generator (35) is used to fill the water mist medium particles into the box of the water mist medium simulation layer (32) to simulate the water mist medium environment, and the aerosol generator (36) is used to fill the aerosol medium particles into the box of the aerosol medium simulation layer (33) to simulate the atmospheric aerosol environment; The optical transmission channel (I37) is used to transmit the polarized light generated by the polarized light generating module (1) so that the polarized light enters the box of the salt mist medium simulation layer (31) and is transmitted; the optical transmission channel (II38) is used to transmit the polarized light emitted by the salt mist medium simulation layer (31) so that the polarized light enters the box of the water mist medium simulation layer (32) and is transmitted; the optical transmission channel (III39) is used to transmit the polarized light emitted by the water mist medium simulation layer (32) so that the polarized light enters the box of the aerosol medium simulation layer (33) and is transmitted; the optical transmission channel (IV310) is used to transmit the polarized light emitted by the aerosol medium simulation layer (33) so that the polarized light enters the polarized light receiving and measuring module (4); The reflector (Ⅰ311), reflector (Ⅱ312), reflector (Ⅲ313), reflector (Ⅳ314), reflector (Ⅴ315) and reflector (Ⅵ316) are used for multiple reflection of polarized light to increase the transmission distance of polarized light inside each layer of the box; The temperature sensor (Ⅰ317), the temperature sensor (Ⅱ320) and the temperature sensor (Ⅲ323) are used to adjust and monitor the temperature conditions in the boxes of the salt spray medium simulation layer (31), the water mist medium simulation layer (32) and the aerosol medium simulation layer (33) in real time; The humidity sensor (Ⅰ318), humidity sensor (Ⅱ321) and humidity sensor (Ⅲ324) are used to adjust and monitor the humidity conditions in the boxes of the salt spray medium simulation layer (31), the water mist medium simulation layer (32) and the aerosol medium simulation layer (33) in real time; The Malvern particle size analyzer (I319), Malvern particle size analyzer (II322) and Malvern particle size analyzer (III325) are used to measure the particle size and density information of particles in the salt spray medium simulation layer (31), the water mist medium simulation layer (32) and the aerosol medium simulation layer (33) boxes.

4. A polarization transmission test device and method for simulating a complex sea fog environment, characterized in that: The polarized light receiving and measuring module (4) comprises a beam splitter prism (41), a polarization state measuring instrument (42), an optical power meter (43) and a computer processing system (44); The beam splitter (41) splits the received polarized light into two identical vertical beams, one beam enters a polarization state measuring instrument (42), and the other beam enters an optical power meter (43). The polarization state measuring instrument (42) is used to measure the polarization state and polarization degree information of the polarized light, the optical power meter (43) is used to measure the light intensity information of the polarized light, and the computer processing system (44) is used to record the measured data and analyze it.

5. A polarization transmission test device and method for simulating a complex sea fog environment, characterized in that: The polarization transmission test device for a complex sea fog environment as described in claims 1 to 4 is applied, comprising the following steps: S1, preparing salt mist, water mist and aerosol medium particles to be filled into the complex medium optical environment module (3) to simulate different complex medium transmission environments; S2, construct a polarized light generating module (1), and arrange the laser (11), collimator (12), attenuation plate (13), linear polarizer (14) and λ / 4 wave plate (15) vertically in sequence, wherein the laser (11) is used to emit lasers of different wavelength bands, the linear polarizer (14) is used to adjust the laser to linear polarized light of 0°, 45°, 90° and 135°, and the λ / 4 wave plate (15) is used to adjust the linear polarized light to left-handed or right-handed circularly polarized light. The light beam passes through the collimator (12), attenuation plate (13), linear polarizer (14), λ / 4 wave plate (15) and complex medium optical environment module (3) in sequence, and then is emitted and enters the polarized light receiving and measuring module (4). The horizontally adjustable rotating stage (2) is located directly below the laser (11) in the vertical direction, and is used to adjust the azimuth angle of the emitted polarized light; S3, constructing a polarized light receiving and measuring module (4), placing a beam splitter prism (41) in a vertical direction of the optical path, a polarization state measuring instrument (42) located directly above the beam splitter prism (41) in a vertical direction, an optical power meter (43) located directly to the right of the beam splitter prism (41) in a horizontal direction, and both the polarization state measuring instrument (42) and the optical power meter (43) are connected to a computer processing system (44); S4, turning on the main power supply of the complex medium optical environment module (3) to ensure that all parts of the box are in normal working condition; S5, turning on the laser (11), the light beam is transmitted through the complex medium optical environment module (3) and then enters the polarized light receiving and measuring module (4), and the light intensity value of the polarized light when the box is empty is measured using the optical power meter (43); S6, turning on the salt spray generator (34), water mist generator (35) and aerosol generator (36) in the complex medium optical environment module (3), filling the corresponding layers of boxes with salt spray medium particles, water mist medium particles and aerosol medium particles, ensuring that the medium particles are filled into each layer of the box at the same time, and using the optical power meter (43) to measure the light intensity value of the polarized light received under the complex sea fog environment. Alternatively, only two layers of the box may be filled with medium particles, and the other layer may remain in an empty box state, to study the transmission of polarized light under different complex sea fog environments. Characteristics, by adjusting the temperature sensor (Ⅰ317), temperature sensor (Ⅱ320) and temperature sensor (Ⅲ323), the temperature conditions in each layer of the box can be set and monitored in real time, by adjusting the humidity sensor (Ⅰ318), humidity sensor (Ⅱ321) and humidity sensor (Ⅲ324), the humidity conditions in each layer of the box can be set and monitored in real time, and the particle size and distribution conditions in each layer of the box can be measured by Malvern particle size analyzer (Ⅰ319), Malvern particle size analyzer (Ⅱ322) and Malvern particle size analyzer (Ⅲ325); S7, through the light intensity information of the emitted light in the empty box state measured by S5 and the light intensity information of the emitted light when filled with dielectric particles measured by S6, the optical thickness τ in the complex medium environment is calculated: Among them, I0 is the light intensity information of the emitted light in the empty box state, I1 is the light intensity information of the emitted light when each layer of the box is filled with dielectric particles, and τ is the optical thickness in a complex medium environment; S8, emptying the medium particles in each layer of the box of the complex medium optical environment module (3), moving the Malvern particle size analyzer (Ⅰ319), Malvern particle size analyzer (Ⅱ322) and Malvern particle size analyzer (Ⅲ325) into the corresponding layers of the box, and filling the corresponding medium particles into each layer of the box, and using the Malvern particle size analyzer (Ⅰ319), Malvern particle size analyzer (Ⅱ322) and Malvern particle size analyzer (Ⅲ325) to obtain the particle size and particle distribution of each layer of the medium particles; S9, finding the refractive index of the dielectric particles inside each layer of the box, and sequentially substituting the wavelength of the polarized light emitted by the laser (11) in the polarized light generating module (1), the polarization state of the incident polarized light, the refractive index of the dielectric particles, the particle size measured by the Malvern particle sizer (I319), the Malvern particle sizer (II322) and the Malvern particle sizer (III325), and the optical thickness of the complex dielectric particle environment into the Monte Carlo simulation program to simulate the polarization value of the polarized light after being transmitted through the complex dielectric environment; S10, discharge the medium particles in each layer of the box in the complex medium optical environment module (3), restore each layer of the box to its original empty state, remove the Malvern particle size analyzer from each layer of the box, turn off the components in the polarized light generating module (1) and the polarized light receiving and measuring module (4) and the main power supply of the complex medium optical environment module (3), and the experimental test is completed.

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