Simulation device for sea fog polarization transmission and test method thereof

A simulation device, sea fog technology, applied in the field of sea fog polarization transmission simulation device, can solve the problems of large error, fast fog dissipation, unstable sea fog simulation device, etc., achieve reliable technical support and improve accuracy

Pending Publication Date: 2021-12-07
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AI-Extracted Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a simulation device for sea fog polarization transmission and its test method to solve the prob...
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The invention discloses a simulation device for sea fog polarization transmission and a test method thereof, and belongs to the technical field of polarization transmission characteristics. The simulation device comprises a transmitting device, a receiving device, a main box body, a light automatic alignment system, a water mist layer calibration system, a salt mist layer calibration system and an aerosol layer calibration system. According to the invention, automatic alignment of polarized light and a relatively stable sea fog environment are simulated in an indoor environment, the accuracy of indoor simulation is improved, the conformity of measured data and a theoretical simulation result is superior to 80%, and reliable technical support is provided for sea surface detection.

Application Domain

Light polarisation measurement

Technology Topic

EngineeringMechanical engineering +3


  • Simulation device for sea fog polarization transmission and test method thereof
  • Simulation device for sea fog polarization transmission and test method thereof
  • Simulation device for sea fog polarization transmission and test method thereof


  • Experimental program(1)

Example Embodiment

[0036] Simulation device for sea transport as fog polarization figure 1 Shown, including a transmitting means, receiving means 2, a main casing 3, light automatic alignment system 4, water spray layer 5 calibration system, the calibration system 6 layer salt spray, aerosol calibration system 7 layers. Wherein the inside of the main housing 3 with a horizontally disposed top to bottom spacing the aerosol separator layer lens 31, a lens layer mist separator 32 and the separator lens salt spray layer 33 from top to bottom inside the main body casing 3 layer into an aerosol, mist layer, sidewall layer and the air layer, salt spray, the aerosol is provided with a layer of a first observation window 34 and the first exhaust port 37, the side wall is provided with a second layer of salt spray observation window 35 and a second exhaust port 38, the side wall is provided with a third layer of salt spray observation window 36 and the third exhaust port 39, a sidewall blank is provided with a fourth layer observation window 310, observation window 34 of the first, second observation window 35, an observation window 36 and the third and fourth viewing window 310 coaxially aligned; a first exhaust port 37, exhaust port 39 coaxial with the second and third exhaust ports 38 are arranged. Part of the transmitting apparatus 1 comprises a laser 11, a liquid crystal light modulator SLM12, attenuator 13, a polarizer 14 and a λ / 4 ,, slide 15 to achieve the emitted light beam. Emitting device 1 is placed flat on a spiral track 43 in the main casing 2 dummy layer, adjust the deflection direction in the plane of the spiral track 43, and thus the corresponding control angle emitting device 1 is rotated. Part of the receiving apparatus 2 comprises a dichroic prism 21, the polarization meter 22, optical power meter 23 and computer 24, and can achieve real-time test data analysis. Receiving device 2 is placed on top of the main housing 3. The semiconductor-plate 41 disposed within the main housing 3 and connected to the top surface of the first control means 42, then the control means 42 connected by a first planar spiral track 43 controls the uplink beam alignment can be automatically aligned with the light. Mist apparatus 51 occurs, the humidity meter 52, thermometer 53 and the vapor pressure meter 54 is placed vertically on the side wall of the main case 3, for calibration of the layer of mist; salt spray apparatus 61 occurs, the uptake of chloride 62 , the second power meter 63 positioned perpendicular to the main housing side wall 3, for calibration layer salt spray; aerosol generating means 71 is located in the side wall of the main case 3, and the visibility meter 72 Malvern particle size analyzer 73 placed horizontally salt spray layer on the separator lenses 33, for aerosol calibration layer.
[0037]Specifically, the laser 11 uses the dye tunable laser produced by Rich Technology (Beijing) Co., Ltd., the liquid crystal light modulator SLM12 is the liquid crystal light modulator produced by Beijing Bewu Technology Co., Ltd., the declining piece 13 is used in Shenzhen The attenuation tablets produced by Optoelectronics Co., Ltd. use Beijing Yongxing Perception Information Technology Co., Ltd., λ / 4 slides 15 use Fuzhou Meizheng Optoelectronics Co., Ltd., the spectrous prism 21 uses American Thorlabs production The prism, the polarization state measuring instrument 22 adopts the polarized sensor tester of Chengdu Guangchi Technology Co., Ltd., and the optical power meter 23 uses Digital Handheld Optical Power Planted in Thorlabs.
[0038] The process of the present invention is as follows:
[0039] Step 1, the experimental environment is prepared
[0040] The transmitting device 1 and the receiving device 2 are detected, and each experimental equipment is fixed on the optical platform, calibrate the planar spiral track 43 zero, ensuring the dark drying environment in the main box 3, avoiding the environmental light to the laser effect to meet the required Experimental conditions;
[0041] Step 2, analog gas
[0042] The corresponding gas generating device is turned on based on the sea fog environment to be simulated. The opening of the aerosol generating device 71 is filling the atmospheric aerosol particles internally, and the water mist generating device 51 is opened to the inner filler particles of the water mist layer as a transport medium, and the medium of the salt spray generating device 61 is set. The concentration is filled with salt fog layer as a water mist particle of salt crystal particles as the core as a transmission medium;
[0043] Step three, adjust the transmit terminal
[0044] The transmitting device 1 is turned on, and the laser 11 transmits the laser light of the respective band, in parallel to the liquid crystal light modulator SLM 12, the exit laser is attenuated by the attenuating piece 13, and the lamba / 4 slide 15 is changed, passed through the lambda / 4 slide 15 The polarization light is changed to a circularly polarized light;
[0045] Step four, light alignment
[0046] Light passes through the top layer to the main box 3 in the three-layer simulated sea mist, and if the receiving end is not received correctly, the beam falls on the semiconductor photosensitive plate 41, and the semiconductor is turned on to the first control device 42, the first control The device 42 adjusts the deflection direction of the planar spiral rail 43 by the received signal, and then controls the respective angle of the transmitting device 2 until the photosensitive plate 41 is incident, and the light beam is received correctly;
[0047] Step 5, stable interval calibration method
[0048] The stable interval calibration method is calibrated with a bundle laser. The stable interval calibration method of the water mist layer of the apparatus is to determine the concentration of the mist by the difference in temperature and humidity, and the humidity gauge 52 is measured by the temperature, the temperature meter 53 measures the temperature, calculates the difference, and the difference is stable, and the water mist concentration is stable. The difference between the difference is large and the water mist concentration is unstable.
[0049] It is known that the relative humidity F is the actual air water steam pressure (P1) and the percentage of saturated water vapor pressure (P2) at the same temperature.
[0051] In order to simplify the calculation of the percent sign, it is slightly separated.
[0053] According to the Clark equation and the ideal gas state equation available:
[0054] p 1 M = ρ 1 RT
[0056] Known, ρ 1 For the actual water vapor density, R is the molar gas constant, L is the phase change latent heat, and M is moisture mass of water vapor, T = 273.15k, n = 1 mol, L / NRT is constant, so the water vapor content changes and temperature changes (DT) ) Can cause changes in fog concentration (DF): increase the water vapor and lower temperature to increase the relative humidity of the air (DF> 0), making the original unusual mist be more concentrated, but it will make it very The concentrated fog became very light or even dissipated. It can be proved that the variation of the fog is effective for determining the concentration of the fog with a variation of humidity and temperature.
[0057] The salt fog layer of this device is calibrated by the method of bonding the optical power and the chloride concentration, and the laser is attenuated by the latex layer after the salt mist layer. When the mist is stable, the optical power fluctuates in a relatively stable range, while at the same time The chloride ion in the salt mist layer was detected, and the calibration was performed according to the salt mist concentration formula.
[0059] Where S c For the salt fog content, [cl-] is chloride concentration, Q is the flow rate of sampling, V is the total volume of the absorption liquid, and T is the sampling time. Viewing the number of the second optical power meter 63 is stabilized within a certain range, and then the chloride ion in the salt mist layer is collected by the chloride ion absorber 62, and the salt mist concentration is calculated according to the salt spray concentration formula.
[0060] The calibration of the aerosol layer of the unit is specifically determined by the Malvin Granular 73 and the visibility meter 72 to determine the particle concentration. The empty box control group is provided, and the visibility range is measured when the gas-free particles were filled with gas-soluble particles, and the particle size distribution of saturation was measured using the Marvin granularizer 73.
[0061] Step 6. Adjust the receiving end
[0062] The beam received by the receiving device 2 is incident in the split prism 21, and the spectroscopic prism 21 is divided into two beams, one beam, an optical power meter 23, is used to test optical power on the optical power meter 23, and another bundle. The probe of the polarization measuring instrument 22 is incorporated here to receive each test value of polarization light on the polarization state measuring instrument 22, and the computer 24 records each value for analysis.
[0063] Step 7. The test ends
[0064] Turn off each device, open the first vent air port 37, the second exhaust port 38, and the third exhaust port 39 for emptying.
[0065] As described above, it is only the embodiments of the present invention, but the scope of the invention is not limited thereto, any of the techniques that are well known in the art, can easily think of change or replacement, It is covered within the scope of the invention.


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