CN113551787A - Simulation transposition for evaluating influence of atmosphere on active remote sensing detection mode - Google Patents
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Abstract
The invention provides a simulation device for evaluating the influence of atmosphere on an active remote sensing detection mode, which comprises: the device comprises a simulation cavity, a turbulence effect simulation system, an aerosol effect simulation system, a detection device and a control system. A transmission channel is arranged in the simulation cavity, and optical windows are arranged at two ends of the transmission channel; the turbulent effect simulation system comprises a heater and a refrigerator, wherein the heating output end and the refrigerating output end of the heater and the refrigerator are respectively arranged at two sides of the transmission channel; the aerosol effect simulation system comprises an aerosol generator and an attenuation sheet, wherein aerosol particles are input into the simulation cavity by the aerosol generator, and the attenuation sheet is arranged outside the simulation cavity and on a transmission channel close to one side of the laser emission end; the detection device is arranged on the outer side of the optical window on one side of the simulation cavity far away from the laser emission end. The invention can simulate real aerosol and turbulent flow distribution in a meter-level simulation cavity and evaluate the attenuation and distortion influence of high-energy laser generated by atmosphere modulation after long-distance transmission in the atmosphere.
Description
Technical Field
The invention relates to the technical field of space optical communication, in particular to a simulation transposition for evaluating the influence of atmosphere on an active remote sensing detection mode.
Background
With the development of laser technology, laser as an active optical remote sensing detection technology has unique advantages in the aspects of spatial resolution, detection sensitivity, anti-interference capability, real-time monitoring and the like, and is widely applied to the fields of aerospace, geographical mapping, three-dimensional modeling, atmospheric environment monitoring, ocean remote sensing and the like. The atmospheric characteristics are the most important considerations for laser transmission in the atmosphere. The atmospheric environment has instability, which is constantly changed by the conditions of temperature, humidity, density, etc., and the water, sand dust, aerosol (fog, smoke, haze, mist, mote and smog) in the atmosphere are in continuous movement and change, and due to the influence of channel transmission and absorption, scattering, turbulence, etc. of the atmospheric medium, the phenomena of attenuation, flicker, offset, intensity and phase fluctuation of the laser light during the atmospheric transmission process occur, so that the laser transmission characteristic and the light beam quality are influenced. Therefore, when simulating laser transmission in atmospheric environment, the atmosphere should be regarded as a random medium, and especially for simulating laser damage characteristics in long-distance atmospheric environment, the emphasis is to realize stable, controllable and highly simulated equivalence of actual atmospheric turbulence and aerosol, and to perform measurement of laser transmission characteristics in quantifiable and comprehensive atmospheric turbulence and aerosol simulation environment. The existing atmospheric environment simulation equipment is mainly used for researching the change process of complicated particle characteristics in the aerosol cloud forming process and the influence of turbulence on the process, and the box body is large.
As can be known from the prior art, the currently existing atmosphere simulation equipment has the following problems: (1) the simulated laser atmospheric transmission channel lengths are all short (mostly in the meter level), so that kilometer-level simulation equipment is less researched, and for practical application, the transmission distances of lasers are all beyond the kilometer level; (2) the turbulence or aerosol simulations reported in the publication generally enable only a single element measurement of the effect on laser transmission, but not a combined effect. (3) The aerosol particles in the aerosol simulation chamber have certain non-uniformity and instability, and the simulation measurement error of laser atmospheric transmission is larger.
Therefore, a simulation transpose for evaluating the influence of the atmosphere on the active remote sensing detection mode needs to be designed, so that kilometer-grade real aerosol and turbulent flow distribution can be simulated in meter-grade equipment, and the attenuation and distortion influence of high-energy laser generated by atmosphere modulation after long-distance transmission in the atmosphere can be evaluated.
Disclosure of Invention
In view of the defects of the prior art, the invention provides a simulation transpose for evaluating the influence of atmosphere on an active remote sensing detection mode, can provide a theoretical basis for the design and development of high-energy laser equipment, and can also assist in developing the calibration of laser performance and performance evaluation in an actual open environment.
To achieve the above and other related objects, the present invention provides a simulation apparatus for evaluating the influence of atmosphere on an active remote sensing detection method, comprising: the device comprises a simulation cavity, a turbulence effect simulation system, an aerosol effect simulation system, a detection device and a control system;
a transmission channel is arranged in the cavity of the simulation cavity, and optical windows are arranged at two ends of the transmission channel on the simulation cavity;
the turbulent effect simulation system comprises a heater and a refrigerator, and heating output ends and refrigerating output ends of the heater and the refrigerator are respectively arranged in the simulation cavities on two sides of the transmission channel;
the aerosol effect simulation system comprises an aerosol generator and an attenuation sheet, wherein aerosol particles are input into the simulation cavity by the aerosol generator, and the attenuation sheet is arranged outside the simulation cavity and positioned on the transmission channel close to one side of the laser emission end;
the detection device is arranged on the outer side of the optical window on one side of the simulation cavity far away from the laser emission end and used for receiving and analyzing the test laser passing through the transmission channel;
the control system is respectively and electrically connected to the turbulence effect simulation system and the aerosol effect simulation system.
In an example of the present invention, the turbulence effect simulation system further includes a plurality of fans disposed in the simulation chamber in a vertical direction of the transmission channel.
In an example of the present invention, the heating output end of the heater is a plurality of heating plates, and the plurality of heating plates are arranged on the inner wall of the simulation cavity.
In an example of the present invention, the refrigerator is a water-cooling circulation device, the refrigeration output end is a cooling liquid circulation plate, and a circulation water-cooling pipeline is installed on the cooling liquid circulation plate.
In an example of the present invention, a self-calibration mechanism is further disposed outside the analog cavity, and the self-calibration mechanism includes a calibration light source and a calibration laser detection device, where the calibration light source emits laser light at a laser emission end, passes through the analog cavity along the transmission channel via the attenuation sheet, and is received by the calibration laser detection device at a laser detection end.
In an example of the present invention, the attenuation sheet is at an angle of 45 ° to 90 ° to the transmission channel.
In an example of the present invention, the attenuation sheet is disposed along a direction having an angle of 45 ° with the transmission channel, and an optical trap is disposed on a side of the attenuation sheet reflecting the laser incident along the transmission channel.
In one example of the invention, the attenuation sheet is mounted on a moving stage that moves along the orthogonal direction of the transmission channel at the laser emitting end.
In an example of the present invention, the aerosol effect simulation system further includes a stirring fan, and the stirring fan is disposed in the simulation chamber.
In an example of the present invention, the aerosol effect simulation system further includes a zero-order air generator and a plurality of valves, wherein the zero-order air generator inputs clean air into the simulation cavity and exhausts the gas containing aerosol particles in the simulation cavity from the plurality of valves.
In summary, the simulation device for evaluating the influence of the atmosphere on the active remote sensing detection mode of the invention generates real aerosol and turbulent flow distribution through the atmospheric environment simulation cavity, and combines with the attenuation sheet, sets the same amount of aerosol particle number and turbulence intensity on the meter-level simulation device to realize atmospheric kilometer-level effect under different conditions, realizes kilometer-level atmospheric environment simulation, is used for developing experiments on the influence of atmospheric attenuation effect and turbulence effect on laser transmission under different transmission distances and different atmospheric conditions, and obtains the damage action conditions under laser energy attenuation, light intensity flicker, light beam drift and light beam expansion. The laser self-calibration correction function is provided, the high-precision atmospheric environment closed-loop simulation is met, the equivalent parameter control technology that long optical path aerosol particles and turbulence intensity transition to a meter-level simulation device is solved, and the simulation precision and the state establishment speed of the attenuation effect are improved by measuring and feeding back the transmittance in real time in the process of establishing the attenuation effect state. The method is used for evaluating the influence of the laser on the atmosphere in the atmospheric environment in the long-distance transmission process. The method can provide theoretical basis for the design and development of laser, and can also carry out the calibration of laser performance and the prediction of transmission characteristics in the actual open environment.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a simulation transfer for evaluating the influence of the atmosphere on the active remote sensing mode according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a turbulence effect simulation system for evaluating the effect of atmosphere on an active remote sensing mode according to an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of an aerosol effect simulation system for evaluating the influence of the atmosphere on an active remote sensing mode according to an embodiment of the present invention;
FIG. 4 is a flowchart of the simulation apparatus for evaluating the influence of the atmosphere on the active remote sensing mode according to an embodiment of the present invention.
FIG. 5 is a schematic interface diagram of the simulation for evaluating the influence of the atmosphere on the active remote sensing detection mode of the present invention transferred to the simulation of the turbulence effect of the control system main control software in an embodiment.
Fig. 6 is an interface schematic diagram of atmospheric aerosol effect simulation of control system main control software in an embodiment of the present invention, which is transferred to a simulation for evaluating the influence of the atmosphere on an active remote sensing detection mode.
Description of the element reference numerals
100. A simulation chamber; 110. an input optical window; 120. an output optical window; 130. a transmission channel; 140. an input valve; 150. an output valve; 151. aerosol filter screen; 200. a turbulence effect simulation system; 210. a heater; 211. heating plates; 220. a refrigerator; 221. a coolant circulation plate; 222. a circulating water cooling pipeline; 230. a transverse fan; 240. a temperature sensor; 300. an aerosol effect simulation system; 310. an aerosol generator; 320. an attenuation sheet; 321. a motion stage; 330. a zero-order air generator; 340. a stirring fan; 350. calibrating the light source; 360. calibrating the laser detection device; 370. a light trap; 400. a control system; 410. a host; 600. testing the laser; 700. and (4) a detection device.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict. It is also to be understood that the terminology used in the examples is for the purpose of describing particular embodiments only, and is not intended to limit the scope of the present invention. Test methods in which specific conditions are not specified in the following examples are generally carried out under conventional conditions or under conditions recommended by the respective manufacturers.
Please refer to fig. 1 to 6. It should be understood that the structures, ratios, sizes, and the like shown in the drawings are only used for matching the disclosure of the present disclosure, and are not used for limiting the conditions of the present disclosure, so that the present disclosure is not limited to the technical essence, and any modifications of the structures, changes of the ratios, or adjustments of the sizes, can still fall within the scope of the present disclosure without affecting the function and the achievable purpose of the present disclosure. In addition, the terms "upper", "lower", "left", "right", "middle" and "one" used in the present specification are for clarity of description, and are not intended to limit the scope of the present invention, and the relative relationship between the terms and the terms is not to be construed as a scope of the present invention.
The invention aims to provide a simulation transpose for evaluating the influence of atmosphere on an active remote sensing detection mode, which can provide a theoretical basis for the design and development of high-energy laser equipment and can assist in developing the calibration of laser performance and the performance evaluation in an actual open environment.
Referring to fig. 1 to 3, fig. 1 is a schematic structural diagram of a simulation transpose for evaluating the influence of the atmosphere on the active remote sensing detection mode; FIG. 2 is a schematic diagram of a simulation system 200 for turbulence effect in a simulation apparatus for evaluating the effect of the atmosphere on an active remote sensing mode; fig. 3 shows a schematic structural diagram of an aerosol effect simulation system 300 in a simulation transpose for evaluating the influence of the atmosphere on an active remote sensing detection mode. The simulation device for evaluating the influence of the atmosphere on the active remote sensing detection mode can simulate the generation of real aerosol and turbulent flow distribution and evaluate the attenuation and distortion influence of the high-energy laser formed by atmosphere modulation after the high-energy laser is transmitted in the atmosphere for a long distance. The simulation device may include a simulation chamber 100, a turbulence effect simulation system 200, an aerosol effect simulation system 300, a detection device 700, and a control system 400.
Referring to fig. 1 to 3, the simulation cavity 100 may be a cubic closed cavity, a transmission channel 130 is disposed in the simulation cavity 100 and used for providing a test optical path and a calibration optical path for long-distance transmission of simulation laser in different atmospheric environments, the transmission channel 130 is disposed along a long side direction of the simulation cavity 100, and an effective length L of the transmission channel 130 is about 1 m. The simulation cavity 100 is provided with an optical window at each of two ends of the transmission channel 130, an input optical window 110 is provided at the laser emitting end, and an output optical window 120 is provided at the laser receiving end, and the optical windows are provided with high-transmittance anti-glare lenses, so that the test laser can pass through the optical windows without loss. Meanwhile, in order to simulate the effect of attenuation of aerosol effect and distortion of turbulence effect after the laser passes through the atmosphere through the simulation chamber 100, a test laser 600 is required to be arranged at a position corresponding to the input optical window 110 at the laser emitting end of the simulation chamber 100, and a corresponding detection device 700 is required to be arranged at a position corresponding to the output optical window 120 at the laser receiving end of the simulation chamber 100. The test laser 600 emits test laser at a laser emitting end, the test laser enters the simulation cavity 100 from the input optical window 110 along the direction of the transmission channel 130, leaves the simulation cavity 100 through the output optical window 120 after passing through the atmospheric environment simulated in the simulation cavity 100, and is received by the detection device 700 arranged at a laser receiving end after being focused, the detection device 700 detects the received test laser, analyzes and measures parameters such as power, phase, spot quality and the like of the test laser after passing through the simulated atmospheric environment and compares the parameters with the test laser without passing through the simulated atmospheric environment, thereby obtaining specific influences of different atmospheric environments on the transmission laser. Parameters such as intensity, wavelength, pulse width and the like of the test laser emitted by the test laser 600 may not be limited, in the simulation apparatus of the present invention, the parameters of the emitted test laser may be adjusted by replacing different test lasers 600, and the detection apparatus 700 disposed at the laser receiving end of the simulation cavity 100 may be set corresponding to different test lasers 600, and in an embodiment of the present invention, the wavelength of the laser emitted by the test laser 600 is 1 to 1.5 μm.
Referring to fig. 1 and 2, the turbulence effect simulation system 200 includes a heater 210, a refrigerator 220, and a plurality of transverse fans 230, wherein the heating output end and the cooling output end of the heater 210 and the refrigerator 220 are respectively disposed on the walls of the simulation chamber 100 at two sides of the transmission channel 130, and the plurality of transverse fans 230 are disposed in the simulation chamber 100 along the direction perpendicular to the transmission channel 130 of the laser. The heating output end is provided with a plurality of heating plates 211, the refrigerating machine 220 is water-cooling circulation equipment, the refrigerating output end is provided with a cooling liquid circulation plate 221, a circulation water-cooling pipeline 222 is arranged on the cooling liquid circulation plate 221, in one embodiment of the present invention, the heating plates 211 are disposed at the top of the simulation chamber 100 in the direction of the transfer channel 130, and the cooling liquid circulation board 221 is arranged at the bottom of the simulation cavity 100 along the direction of the transmission channel 130, the circulating water cooling pipeline 222 on the cooling liquid circulation board 221 meanders and extends from one end of the transmission channel 130 of the simulation cavity 100 to the other end on the wall body at the bottom of the simulation cavity 100 along the direction of the transmission channel 130, both ends of the circulating water cooling pipeline 222 are connected to the water cooling circulation equipment, the arrangement can effectively increase the contact area between the circulating water cooling pipeline 222 and the cooling liquid circulating plate 221, thereby improving the refrigeration effect of the cooling liquid circulating plate 221.
Referring also to fig. 1 and 2, in an embodiment of the present invention, the turbulence effect simulation system 200 further includes a plurality of temperature sensors 240 and a plurality of wind speed sensors. The plurality of temperature sensors 240 are uniformly distributed in the simulation cavity 100 along the direction of the transmission channel 130, and the plurality of temperature sensors 240 are arranged at the same transmission channel 130 position of the simulation cavity 100 along the direction of the temperature gradient, so that the temperature gradient generated by the turbulence effect simulation system 200 at each position in the simulation cavity 100 along the direction of the transmission channel 130 is accurately monitored; and the wind speed sensor is used for monitoring the airflow wind speed condition in the simulation cavity 100.
As can be seen from the above, the turbulence effect simulation system 200 generates an upper and lower board temperature difference environment by the heating boards 211 and the cooling liquid circulation boards 221 disposed on both sides of the transmission channel 130, and arranges a plurality of lateral fans 230 with variable wind power in the vertical laser transmission direction, so as to form near-ground and above-ground turbulence conditions simulating the actual earth atmospheric environment by adjusting the temperature field and the wind power, thereby realizing equivalent simulation of the laser atmospheric kilometer-level long-distance transmission turbulence effect. The turbulence effect simulation system 200 realizes turbulence state simulation with atmospheric coherence length of more than 0.3cm in the simulation cavity 100 with effective test length of about 1m, and meets the condition that the turbulence intensity is less than 9.5 multiplied by 1015m-2/3The horizontal atmospheric transmission distance and the inclined distance transmission distance of 1-50 Km and 1-20 Km (the transmission target height is 5-8 Km) under different visibility conditions, and the transmittance of 0.2-1. And comprehensively analyzing all uncertain factors, wherein the simulation precision of the atmospheric turbulence effect after synthesis is 8.3%.
Referring to fig. 1 and 3, the aerosol effect simulation system 300 includes an aerosol generator 310 and an attenuating plate 320. The aerosol generator 310 can generate aerosol particles with fixed particle size distribution and precisely controlled flow rate, and the aerosol particles are input into the simulation cavity 100 through the input valve 140 arranged on the wall body of the simulation cavity 100 so as to simulate the typical atmospheric aerosol state in the simulation cavity 100. The attenuation sheet 320 is disposed outside the analog cavity 100, on a side of the laser emitting end outside the analog cavity 100, and may extend into the transmission channel 130 at a position opposite to the input optical window 110, so as to assist in simulating an attenuation effect of aerosol of laser on the laser during long-distance transmission in the atmosphere. The aerosol effect simulation system 300 can simulate the atmospheric aerosol environment under different visibility conditions without the aid of the attenuation sheet 320 when simulating transmission at a short distance, such as when the simulated transmission distance is less than or equal to 20Km, but when simulating transmission at a low visibility and a long distance, such as when the visibility is 5-15 Km and the simulated transmission distance is greater than 20Km, the attenuation sheet 320 needs to be switched into the transmission channel 130 to compensate for the attenuation effect. The aerosol effect simulation system 300 can realize continuous state simulation of transmittance of 0.09-1 through the cooperation of the aerosol generator 310 and the attenuation sheet 320 in the simulation cavity 100 with the effective test length L of about 1m, and further realize equivalent simulation of aerosol attenuation effect of horizontal transmission of 1-50 Km and oblique transmission of 1-20 Km (transmission target height is 5-8 Km) of laser in atmospheric environment under different visibility conditions. And comprehensively analyzing all uncertain factors, wherein the simulation precision of the attenuation of the synthesized atmospheric aerosol is 7.35%.
Meanwhile, the simulation device further comprises a self-calibration mechanism, the self-calibration mechanism comprises a calibration light source 350 and a calibration laser detection device 360, the calibration light source 350 is arranged at a laser emission end, standard laser emitted by the calibration light source 350 is transmitted/reflected by an attenuation sheet 320 and then enters the simulation cavity 100 from the input optical window 110 along the direction of the transmission channel 130, the standard laser is attenuated by gas containing aerosol in the simulation cavity 100 and then is output from the output optical window 120, the standard laser enters the calibration laser detection device 360, and the attenuation transmittance of the simulated aerosol is calculated by comparing the energy ratio of the standard laser before and after the aerosol is attenuated by the aerosol in the simulation cavity 100. The simulation device calibrates, feeds back and controls the system simulation attenuation coefficient in real time in the simulation process through the self-calibration mechanism so as to determine the simulation distance of different aerosol atmospheric environments simulated in the simulation cavity 100.
Referring to fig. 1 and 4, fig. 4 shows a workflow diagram of a simulation apparatus for evaluating the influence of the atmosphere on the active remote sensing mode. The control system 400 is connected to each component in the turbulence effect simulation system 200 and the aerosol effect simulation system 300, is a main control unit of a simulation device for evaluating the influence of the atmosphere on the active remote sensing detection mode, calculates attenuation effect and turbulence effect simulation parameters through user input parameters, and controls each component to work cooperatively, so that the accurate establishment of a simulation state is completed. Meanwhile, the control system 400 needs to communicate with the host 410, receive control commands and feedback execution results, and transmit state parameters of the simulation chamber 100, the aerosol effect simulation system 300 and the turbulence effect simulation system 200 at regular time. Specifically, on the basis of an existing high-energy laser atmospheric transmission mathematical model and a calibration rule, atmospheric radiation transmission software and high-energy laser atmospheric transmission software are called according to simulation conditions such as laser transmission distance, visibility of atmospheric environment, turbulence intensity and the like input by a user to calculate and set system parameters (temperature difference, wind speed and aerosol flow rate), and parameter correction is carried out on aerosol attenuation simulation and turbulence flicker simulation through a system real-time attenuation self-calibration mechanism and an offline coherence length high-precision calibration system respectively, so that the laser atmospheric transmission simulation precision is guaranteed.
In addition, the control system 400 is further provided with a host 410, and the host 410 is installed with a main control software of the simulation apparatus, as shown in the figure, the main control software interface of the simulation apparatus is illustrated, and the main control software interface is divided into three areas: the left module of the interface is a simulation parameter input panel, the middle module is a simulation value and actual value output display panel, and the right module is an equipment temperature monitoring panel.
Referring to fig. 5 and 6, fig. 5 is a schematic interface diagram of a simulation device of a control system 400 for evaluating the influence of atmosphere on an active remote sensing mode; fig. 6 shows an interface schematic diagram of a simulation transpose control system 400 for evaluating the influence of the atmosphere on an active remote sensing mode on atmospheric aerosol effect simulation by master control software. In an embodiment of the present invention, a user can simulate a target atmospheric environment by inputting parameters in the main control software, wherein the following three parameters are common to the atmospheric aerosol effect simulation and the atmospheric turbulence effect simulation: laser wavelength (user-settable with 1-1.5 μm), transmission mode (horizontal/oblique distance), and transmission distance (horizontal transmission 1-50 Km/oblique distance transmission 1-20 Km, wherein the target height is required to be input 5-8 Km when oblique distance is selected). The input parameters for aerosol effect simulation are, working scene: urban, rural, desert, and marine types; visibility: the system is low in visibility (5-15 Km), medium in visibility (15-23 Km) or high in visibility (23-50 Km), and the visibility supports user input value customization (5-50 Km) at the same time. The input parameters for the turbulence effect simulation are, turbulence intensity: low strength (1X 10)-16m-2/3) Medium strength (1X 10)-14m-2/3) Or high strength (1X 10)-12m-2/3) Turbulence intensity simultaneously supports user customization (1 × 10)-16～1×10-12m-2/3) A numerical value is input.
The simulation device is characterized in that protective covers are arranged outside each component in the simulation cavity 100, the turbulence effect simulation system 200 and the aerosol effect simulation system 300 according to the requirements of an optical system and the overall working scheme, a frame system is arranged between each component in the simulation cavity 100, the turbulence effect simulation system 200 and the aerosol effect simulation system 300, and the frame system is matched with the protective covers to divide the whole simulation device into two areas, namely a closed cabin and an open cabin. Optical components on the optical paths of the simulation cavity 100 and the transmission channel 130 are arranged in a closed cavity, an upper plate and a lower plate of the closed cavity are made of heat-conducting aluminum plates for quickly transferring heat and heat-insulating layers for maintaining a stable temperature field, and a heating plate 211 and a cooling liquid circulating plate 221 arranged on the heat-insulating layers ensure quick and accurate temperature control. The components of the turbulence effect simulation system 200 and the aerosol effect simulation system 300, which are disposed outside the simulation chamber 100, are disposed in an open cabin, which mainly considers the reasonable layout and physical isolation of the components of the turbulence effect simulation system 200 and the aerosol effect simulation system 300 in the simulation apparatus, and provides electrical, physical, mounting holes and hoisting interfaces.
Referring to fig. 1 and 3, in an embodiment of the present invention, the attenuation sheet 320 is mounted on a moving stage 321, and the moving stage 321 is disposed outside the analog cavity 100 on a side of the laser emitting end and is movable along the orthogonal direction of the transmission channel 130. The moving stage 321 is electrically connected to the control system 400, and when the simulation apparatus simulates low visibility and long distance laser transmission, the moving stage 321 is controlled by the control system 400 to carry the attenuation sheet 320, and the attenuation sheet 320 is cut into the transmission channel 130 to assist the simulation chamber 100 in simulating the aerosol attenuation effect.
Referring to fig. 1, in an embodiment of the present invention, the angle between the attenuation sheet 320 and the transmission channel 130 is 45 ° to 90 °. In an embodiment of this embodiment, the attenuation sheet 320 is disposed along a direction forming an angle of 45 ° with the transmission channel 130, and an optical trap 370 is disposed on a side of the attenuation sheet 320 that reflects the test laser incident along the transmission channel 130, the test laser emitted by the test laser 600 at the laser emitting end passes through the attenuation sheet 320, then the transmission laser enters the analog cavity 100 along the transmission channel 130, and the reflection laser enters the optical trap 370 along a direction orthogonal to the transmission channel 130 for security processing. Meanwhile, the calibration light source 350 is disposed on the other side of the attenuation sheet 320 relative to the light trap 370, the standard laser emitted by the calibration light source 350 is transmitted by the attenuation sheet 320 and enters the light trap 370 along the orthogonal direction of the transmission channel 130 for safety processing, and the reflected laser enters the simulation cavity 100 along the transmission channel 130.
Referring to fig. 1 and 3, in an embodiment of the present invention, the aerosol effect simulation system 300 further includes a plurality of stirring fans 340, the stirring fans 340 are disposed at a side of the simulation chamber 100 close to the input valve 140, and the stirring fans 340 can generate an adjustable wind speed of 0-5 m/s. When the aerosol generator 310 injects aerosol particles with a set value into the simulation chamber 100, the aerosol effect simulation system 300 can start the stirring fan 340 and adjust the wind speed of the stirring fan 340 at a proper time, so that the aerosol in the simulation chamber 100 can be rapidly and uniformly mixed with the air in the chamber.
In this embodiment, the aerosol effect simulation system 300 further includes a zero-stage air generator 330 and a plurality of output valves 150, the zero-stage air generator 330 inputs clean air into the simulation chamber 100 through an input valve 140 disposed on a wall of the simulation chamber 100, the plurality of output valves 150 are disposed on a wall of the simulation chamber 100 on a side away from the input valve 140, and an aerosol filter 151 is disposed on an outer side of each output valve 150 for filtering aerosol in the gas leaving the simulation chamber 100 from the output valve 150, so as to avoid environmental pollution. After the simulation experiment is completed, the zero-level air generator 330 inputs clean air into the simulation chamber 100, and the simulation chamber 100 is cleaned by matching with the output valves 150, so that the gas containing aerosol particles in the simulation chamber 100 is discharged from the output valves 150 and is filtered by the aerosol filter screen 151 to become clean air.
The simulation device for evaluating the influence of atmosphere on the active remote sensing detection mode generates real aerosol and turbulent flow distribution through the atmospheric environment simulation cavity, and is combined with the attenuation sheet, the same amount of aerosol particle number and turbulence intensity are arranged on a meter-level simulation device to realize atmospheric kilometer-level effect under different conditions, kilometer-level atmospheric environment simulation is realized, the simulation device is used for developing experiments on the influence of atmospheric attenuation effect and turbulence effect on laser transmission under different transmission distances and different atmospheric conditions, and the damage action conditions under laser energy attenuation, light intensity flicker, light beam drift and light beam expansion are obtained. And moreover, a laser self-calibration correction function is provided, the closed-loop simulation of a high-precision atmospheric environment is met, the equivalent parameter control technology that long optical path aerosol particles and turbulence intensity transition to a meter-level simulation device is solved, and the simulation precision and the state establishment speed of the attenuation effect are improved by measuring and feeding back the transmittance in real time in the process of establishing the state of the attenuation effect. The method is used for evaluating the influence of the laser on the atmosphere in the atmospheric environment in the long-distance transmission process. The method can provide theoretical basis for the design and development of laser, and can also carry out the calibration of laser performance and the prediction of transmission characteristics in the actual open environment.
The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.
Claims (10)
1. A simulation apparatus for evaluating the effect of atmosphere on an active remote sensing mode, comprising:
the optical fiber transmission device comprises an analog cavity, a transmission channel and a transmission module, wherein the analog cavity is internally provided with the transmission channel, and optical windows are arranged at two ends of the transmission channel on the analog cavity;
the turbulent flow effect simulation system comprises a heater and a refrigerator, wherein heating output ends and refrigerating output ends of the heater and the refrigerator are respectively arranged in the simulation cavities on two sides of the transmission channel;
the aerosol effect simulation system comprises an aerosol generator and an attenuation sheet, wherein aerosol particles are input into the simulation cavity by the aerosol generator, and the attenuation sheet is arranged outside the simulation cavity and positioned on the transmission channel close to one side of the laser emission end;
the detection device is arranged outside the optical window on one side of the simulation cavity far away from the laser emission end and used for receiving and analyzing the test laser passing through the transmission channel;
and the control system is electrically connected to the turbulence effect simulation system and the aerosol effect simulation system respectively.
2. The simulation apparatus for evaluating the effect of atmosphere on active telemetry according to claim 1, wherein the turbulence effect simulation system further comprises a plurality of fans disposed in the simulation chamber in a direction perpendicular to the transmission channel.
3. The simulation apparatus of claim 1, wherein the heater output end comprises a plurality of heater plates disposed on an inner wall of the simulation chamber.
4. The simulation device for evaluating the influence of the atmosphere on the active remote sensing detection mode according to claim 1, wherein the refrigerator is a water-cooling circulation device, the refrigeration output end is a cooling liquid circulation plate, and a circulation water-cooling pipeline is installed on the cooling liquid circulation plate.
5. The simulation transpose for evaluating the influence of atmosphere on an active remote sensing manner according to claim 1, wherein a self-calibration mechanism is further disposed outside the simulation cavity, the self-calibration mechanism includes a calibration light source and a calibration laser detection device, the calibration light source emits laser at a laser emission end, the laser passes through the simulation cavity along the transmission channel via the attenuation sheet, and is received by the calibration laser detection device at a laser detection end.
6. The simulation apparatus for evaluating the effect of the atmosphere on the active remote sensing mode of claim 1, wherein the angle between the attenuator and the transmission channel is 45 ° to 90 °.
7. The simulation apparatus for evaluating the influence of the atmosphere on the active remote sensing mode according to claim 6, wherein the attenuation sheet is arranged along a direction having an angle of 45 ° with the transmission channel, and a light trap is arranged on a side of the attenuation sheet reflecting the laser incident along the transmission channel.
8. The analog device for evaluating the effect of the atmosphere on the active remote sensing mode of claim 1, wherein the attenuator is mounted on a motion stage that moves along the orthogonal direction of the transmission channel at the laser emitting end.
9. The simulation apparatus for evaluating the effect of atmosphere on an active remote sensing mode of claim 1, wherein the aerosol effect simulation system further comprises a stirrer fan disposed within the simulation chamber.
10. The simulation apparatus for evaluating the effect of atmosphere on active remote sensing mode according to claim 9, wherein the aerosol effect simulation system further comprises a zero-order air generator and a plurality of valves, wherein the zero-order air generator inputs clean air into the simulation chamber and exhausts the gas containing aerosol particles in the simulation chamber from the plurality of valves.
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