Non-uniform light spot simulation method and device

Abstract

The invention discloses a method for simulating non-uniform light spots, which comprises the following steps of: determining the number of required laser sources according to the light intensity distribution in the shape of the simulated non-uniform light spots, arranging a plurality of laser sources at the same laser transmitting end, and controlling the central position of the light spots by adjusting the orientation and the pitching angle of each laser source, so as to simulate the non-uniform light spots. The divergence angle, the energy and the intensity distribution of the light spots of each laser source are adjusted, so that different light spots irradiated on the target plate by different laser sources are staggered and superposed to form different light intensity areas; calculating an atmospheric attenuation coefficient of the atmospheric transmittance according to the atmospheric environment parameters, and adjusting the laser intensity of a laser source of the laser transmitting end according to the atmospheric attenuation coefficient; and constructing an atmospheric turbulence simulation model, outputting fluctuation data of the atmospheric turbulence on the laser intensity, propagation direction, phase and frequency of the laser source according to the input atmospheric environment parameters, obtaining adjustment parameters of the laser source corresponding to the fluctuation data by adopting a Fourier transform spectrum inversion method, and adjusting the laser source.

Description

Technical Field

[0001] The invention belongs to the field of optical technology, and in particular relates to a method and a device for simulating uneven light spots. Background Art

[0002] With the widespread application of lasers and other light sources in the fields of industry, scientific research, medical treatment, communications, etc., the requirements for the characteristics and quality of light spots are becoming increasingly diversified and refined. Taking lasers as an example, during the application process, due to the structural composition of the laser cavity, thermal effects, atmospheric transmittance and complex refraction in the actual environment, the light spots formed are random and uneven. Through the study of uneven light spots, we can understand the changes in the intensity distribution of laser beams during propagation, and provide a basis for the optimization and design of various optical components.

[0003] At present, there are several methods for spot simulation:

[0004] 1. Optical software simulation method

[0005] Optical design software can simulate optical imaging through ray tracing. Some software has optimization functions, which can not only simulate geometric optics, but also simulate some physical optical phenomena, such as interference and diffraction. This simulation method is not very realistic and has high requirements for software users.

[0006] 2. Low-power light source simulation method

[0007] By using a low-power light source with relatively weak luminous intensity to simulate the actual light spot, this method can simulate the attenuation of light propagating in the medium. However, it cannot simulate the main factors that cause the unevenness of the light spot, such as turbulence and aerosols during the propagation process. The simulated light spot can only represent the light spot that is uniformly distributed under ideal conditions or conforms to the characteristics of the light source.

[0008] According to the actual application scenario, due to the characteristics of the light source, the aberration of the optical system, diffraction, occlusion and scattering during the propagation process and other reasons, the general far-field light spot has uneven intensity. In view of this phenomenon, it is very necessary to carry out research on uneven light spots. Existing equipment mainly uses low-power light sources for simulation. This method is not enough to simulate the environmental impact and the intensity difference of the light spot, and can only achieve the simulation of uniform light sources under ideal conditions. Summary of the invention

[0009] In view of the deficiencies in the prior art, the present invention provides a method and device for simulating uneven light spots in a laboratory, specifically involving multiple light sources with adjustable energy, divergence angle and intensity distribution. This technology can be used to simulate the uneven light spots formed by the light beam emitted by the light source propagating through a long distance in the atmosphere during actual working process.

[0010] The present invention achieves this purpose through the following technical solutions:

[0011] The present invention provides a method for simulating an uneven light spot, comprising the following contents:

[0012] The required number of laser sources is determined according to the light intensity distribution in the shape of the simulated uneven light spot, and multiple laser sources are arranged at the same laser emitting end. The center position of the light spot is controlled by adjusting the azimuth and pitch angle of each laser source, and the divergence angle, energy and intensity distribution of the light spot of each laser source are adjusted, so that different light spots irradiated on the target plate by different laser sources are staggered and superimposed to form different light intensity areas;

[0013] The atmospheric attenuation coefficient of the atmospheric transmittance is calculated according to the atmospheric environmental parameters, and the laser intensity of the laser source at the laser emitting end is adjusted according to the atmospheric attenuation coefficient;

[0014] An atmospheric turbulence simulation model is constructed. The atmospheric turbulence simulation model outputs the number of turbulent blocks appearing in the light beam, the location where the turbulent blocks appear, the size of the turbulent blocks, and the optical characteristics of the turbulent blocks in a random sampling manner according to the input atmospheric environment parameters, so as to simulate the influence of atmospheric turbulence, and adjust the laser source at the corresponding position in the light spot according to the output data of the atmospheric turbulence simulation model.

[0015] Furthermore, the atmospheric turbulence simulation model is constructed as follows:

[0016] Collect spot image samples on the target board at different distances and different atmospheric environment parameters from different laser emission ends, perform data enhancement, complete annotation and data division on the collected samples, and construct training set, validation set and test set in a ratio of 7:2:1;

[0017] The VGG network is trained using the training set to obtain the atmospheric turbulence simulation model, and the atmospheric turbulence simulation model is verified using the verification set. During the training process, the VGG network identifies and extracts the occurrence probability, size, position and optical characteristics of turbulent blocks under different environments, and then uses the Fourier transform spectrum inversion method to obtain the characteristics and parameters of the phase screen required to construct the atmospheric turbulence simulation model.

[0018] In some embodiments of the present invention, the multiple laser sources are controlled by the same signal source.

[0019] In some embodiments of the present invention, the multiple laser sources are controlled by different signal sources.

[0020] The present invention also provides an uneven spot simulation device for implementing the above-mentioned method, comprising a laser emitting module, a target plate, an azimuth adjustment module, a power supply module and an integrated processing module, wherein the laser emitting module comprises a plurality of laser sources arranged together, the azimuth adjustment module is used to adjust the azimuth and pitch angle of each laser source, the power supply module provides power for the laser emitting module, the azimuth adjustment module and the integrated processing module, the integrated processing module comprises a laser control unit, an atmospheric attenuation simulation unit and an atmospheric turbulence simulation unit, the laser control module is used to control the parameters of the laser source emitting the laser, the atmospheric attenuation simulation unit calculates the atmospheric attenuation coefficient according to the atmospheric environment information, and the atmospheric turbulence simulation unit simulates the atmospheric turbulence according to the atmospheric environment information.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] 1. It can simulate various uneven light spots in the laboratory with simple operation;

[0023] 2. The simulation is more realistic and adjustable;

[0024] 3. Multiple phase relationships are adjustable, which can simulate the light spot conditions in various situations;

[0025] 4. Simulation models under various weather conditions can be set, which greatly enhances the simulation reality;

[0026] 5. The simulation models of multiple influencing factors are independent and parallel, and multiple factors can be integrated at the same time to improve the authenticity of the simulation of uneven spot. Specific influencing factors can be selected for simulation and research.

[0027] In summary, the present invention provides a method for simulating uneven light spots by superimposing multiple light sources with adjustable intensity distribution, energy and spot size to simulate uneven light spots; multiple light sources can be controlled by the same signal source to ensure the superposition of light intensity, or different signal sources can be used for time control to study the interference and superposition effects of light under different phase relationships; the implantation of multiple simulation models can realize the simulation of light propagation processes in a variety of different environments (such as fog, haze, blowing sand, rain, etc.), and simulate as many complex influencing factors (turbulence, attenuation, etc.) in actual application scenarios as possible to ensure the similarity and authenticity of the simulation of uneven light spots. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the implementation methods of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the implementation methods or the description of the prior art. Obviously, the drawings in the following description are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0029] Figure 1 This is a schematic diagram of the structure of the laser emitting end according to an embodiment of the present invention;

[0030] Figure 2 FIG. 4 is a schematic diagram of light spot simulation projection according to an embodiment of the present invention. DETAILED DESCRIPTION

[0031] The exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present invention and to enable the scope of the present invention to be fully communicated to those skilled in the art. It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.

[0032] The way of simulating uneven light spots by spot superposition is based on the wave and superposition principle of light. From the perspective of wave properties, light can be regarded as an electromagnetic wave, which has wave characteristics during propagation. When multiple beams of light approach each other and overlap, their electric and magnetic fields will interact and superimpose.

[0033] When simulating uneven light spots, this method regards multiple independent light spots as the light distribution formed by the same light source after passing through different propagation paths and differentially distributed media. Each light spot can be set with a different intensity distribution, which can be described and set by a mathematical function, such as a Gaussian distribution function. The Gaussian distribution function can better simulate the light intensity distribution generated by most actual light sources. The light intensity is strongest at the center, and the light intensity gradually decreases as it deviates from the center.

[0034] When these light spots with different intensity distributions overlap on the target plate, according to the principle of light superposition, the light intensity at each point on the target plate is the sum of the light intensities of each light spot at that point. By controlling the parameters of each light spot, such as light spot energy, size (divergence angle), center position, intensity distribution characteristics and relative positions between each light spot, the total light intensity distribution after superposition has the characteristic of unevenness.

[0035] The present invention is mainly used to simulate non-uniform far-field light spots in the laboratory, and the simulation of non-uniform light spot characteristics is achieved by superimposing the intensity of multiple orderly arranged laser sources. The center position, divergence angle, energy and intensity distribution of each laser source spot are adjustable, and a variety of complex far-field light spots can be simulated according to the actual spot image.

[0036] The uneven laser simulation device of the present invention is arranged on a laboratory optical platform. According to the characteristics of the light spot to be simulated, the center position, divergence angle, energy and intensity distribution of the light spot of each laser source are adjusted. The unevenness of the simulated light spot is superimposed at different positions by light spots of different intensity distribution, energy and shape.

[0037] The arrangement of multiple light sources is as follows Figure 1 As shown, the arrangement can be adjusted according to the actual usage scenario.

[0038] The laser emission module is composed of multiple laser sources. The center position, divergence angle, energy and intensity distribution of the light spot of each laser source can be set by the host computer software of the comprehensive processing module and irradiated on the target plate to complete the superposition of multiple light spots. The azimuth adjustment module can control the center position of the light spot by adjusting the azimuth and pitch angle of each laser source. The power supply module supplies power to the laser emission module, the azimuth adjustment module and the comprehensive processing module, and realizes the communication between the comprehensive processing module and the laser source and the azimuth adjustment module. The comprehensive processing module includes a laser control unit, an atmospheric attenuation simulation unit and an atmospheric turbulence simulation unit. The laser control module is used to control the parameters of the laser source emitting the laser. The atmospheric attenuation simulation unit calculates the atmospheric attenuation coefficient according to the atmospheric environment information. The atmospheric turbulence simulation unit simulates the atmospheric turbulence according to the atmospheric environment information. The laser control unit has built-in host computer software to complete the control of the laser emission module and the azimuth adjustment module. The schematic diagram of the light spot simulation is shown in the figure. Figure 2 shown.

[0039] The simulation process of the present invention is divided into three parts. The first part is to set the distribution characteristics, divergence angle and irradiation position of the light spot according to the simulation needs, which is used to adjust the superposition position and range of the light spot, and is controlled by the azimuth adjustment module and the laser control unit. The second part is to set the transmission atmospheric environment, select the corresponding attenuation model, and adjust and control each laser source to simulate the impact received in the transmission path under specific weather conditions after calculation by the comprehensive processing module. The third part is the simulation of atmospheric turbulence, which is mainly achieved by adjusting the laser emission characteristics of the laser emission module, including phase, direction and other factors. Since there are many laser sources, after the overall calculation by the comprehensive processing module, instructions are issued to each laser source in accordance with the model calculation results to control them to change.

[0040] This method can be used to perform calculations based on the simulation model to achieve spot simulation. Under different weather conditions, the light propagation process is affected differently. The atmosphere is a mixture of various elements and compounds, and can be roughly divided into dry and clean atmosphere, water vapor, and other suspended solid and liquid particles. Among them, water vapor has a particularly serious effect on the attenuation of radiation. Suspended solid and liquid particles are generally referred to as aerosol particles. The influence of the atmosphere on radiation energy can be divided into refraction, turbulence, and attenuation. Generally speaking, the main factors affecting the effect of laser transmission are the attenuation effect caused by the absorption and scattering of atmospheric molecules and aerosol particles, and the atmospheric turbulence effect.

[0041] This embodiment takes the different impact processes of 1064nm laser propagation in the atmosphere as an example to briefly illustrate the simulation method of attenuation and turbulence.

[0042] Table 1 Absorption and scattering coefficients of atmospheric molecules and aerosols

[0043]

[0044] As can be seen from Table 1, compared with aerosol particles, the effect of atmospheric molecules on 1064nm laser is relatively several orders of magnitude smaller. Therefore, when studying the performance of a specific laser, the absorption effect of atmospheric molecules on the laser can be ignored, and the effect of aerosol on the laser can be focused on.

[0045] Calculation of atmospheric attenuation is expressed by atmospheric transmittance:

[0046]

[0047] Where: T atm is the atmospheric transmittance; L is the propagation distance; A is the atmospheric attenuation coefficient.

[0048] A=K+σ

[0049] Where: K is the total scattering coefficient of atmospheric particles; σ is the total absorption coefficient of atmospheric particles.

[0050] The actual channel environment is complex and changeable. When light pulses propagate in fog, they will be scattered and absorbed by various random media. Therefore, this article takes the visibility of light fog to haze as an example, assuming that the scattering and absorption of photons and atmospheric particles are independent of each other; the absorption coefficient is much smaller than the scattering coefficient, so the attenuation coefficient only considers the Rayleigh scattering of atmospheric particles and the Mie scattering of aerosols; and the incident light is monochromatic, ignoring the polarization effect. Based on this assumption, the Monte Carlo method is used to track the transmission process of a large number of photons in fog. In the tracking process, the scattering angle (determined by the scattering phase function and the random number ξ) is determined based on the Henyey-Greenstein model.

[0051] When photons are transmitted in the atmospheric channel, the scattering that occurs is mainly divided into Mie scattering and Rayleigh scattering, and the scattering coefficients are:

[0052]

[0053] Where: V is the atmospheric visibility; q is the correction factor determined by V; P is the atmospheric pressure; T is the temperature (T = 300K is usually taken under standard atmospheric conditions, and γ is the wave number. During the propagation process, Mie scattering and Rayleigh scattering will occur depending on the scale of the scatterer. Assume that the probability of the two scatterings occurring is P mie and P ray :

[0054] P mie +P ray =1

[0055] Where: P mie and P ray The proportion of K smie and K sray Decide:

[0056]

[0057] The scattering type is determined by ξP, which is randomly sampled in [0, 1]. P <P ray When , Rayleigh scattering occurs, otherwise Mie scattering occurs.

[0058] After determining the scattering type, the cosine function of the scattering deflection angle obtained by sampling the HG phase function is:

[0059]

[0060] Where: θ (m) is the deflection angle of the Mie scattering phase function; θ (r) is the deflection angle of the Rayleigh scattering phase function; ξ (m) and (r) are all random numbers that obey a uniform distribution in the interval [0, 1]; g is the asymmetric factor of the atmosphere, and the scattering phase angle φ is uniformly distributed in the interval [0, 2π].

[0061] The attenuation coefficient of the propagation process in fog is determined as follows. Fog is a colloidal system composed of water droplets or ice crystals suspended in the air near the ground and slowly settling. Due to the presence of fog, visibility in the air is reduced. From the literature, the attenuation coefficient A can be expressed as:

[0062]

[0063] Where: λ is the wavelength (μm); W is the water content of the fog (g / m 3); C is an empirical constant determined by the average slope of the extinction cross section curve calculated using Mie scattering theory, which can be obtained by referring to relevant literature.

[0064] It is generally believed that fog can be divided into advection fog and radiation fog according to wavelength. Inland fog is usually radiation fog. Therefore, the water content W and the droplet radius r have the following relationship:

[0065]

[0066] r=0.4853V -0.54 (μm)

[0067] Where: V is the atmospheric visibility (km). Combining the above formula, the attenuation coefficient A of the radiation fog is obtained as follows:

[0068]

[0069] The intensity of the laser emitted by the laser source is adjusted by the atmospheric attenuation coefficient on foggy days.

[0070] Atmospheric turbulence is an irregular movement of atmospheric molecular groups relative to the average movement of the atmosphere as a whole, and its trajectory is very complex. Atmospheric turbulence appears in vortices of different scales, which are also called turbulent blocks. Different atmospheric turbulent blocks not only have their own movement speed and direction, but also have their own temperature and density, and therefore have their own optical refractive index. Atmospheric turbulent blocks are in a continuous process of generation and disappearance, which causes random fluctuations in the speed, temperature, density and optical refractive index of atmospheric particles in time and space.

[0071] When a laser beam passes through the atmospheric medium, the atmospheric turbulence causes the atmospheric density to fluctuate randomly, resulting in fluctuations in the laser intensity, propagation direction, phase and frequency in space and time. This is the atmospheric turbulence effect of the laser.

[0072] In the simulation of light wave transmission in atmospheric turbulence, the simplest method to simulate atmospheric turbulence is to treat vacuum propagation and medium refractive index fluctuation as two independent processes. That is, parallel plates of a certain thickness are divided on the path of light wave propagation, and the incident light wave is on the front surface of the plate. A phase screen that conforms to the characteristics of atmospheric turbulence is manufactured and placed on the back surface of the plate, so that the phase fluctuation is superimposed on the phase of vacuum propagation.

[0073] The main methods for generating phase screens include spectrum inversion method based on Fourier transform, Zernike polynomial method, fractal method and so on.

[0074] The present invention adopts the Fourier transform spectrum inversion method, uses a complex Gaussian matrix to filter the power spectrum of atmospheric turbulence, and then obtains the distortion phase caused by the atmosphere through inverse Fourier transform. This method has fast operation speed and relatively wide application. At the same time, the subharmonic method is used to compensate the low-frequency component to reduce the error caused by undersampling of the low-frequency component.

[0075] During the turbulence simulation model training process, multiple samples are identified to obtain the turbulence effects under a specific atmospheric environment. According to the principle of Fourier transform spectrum inversion method, the spot distribution characteristics of the samples are analyzed, the parameters required for Fourier transform spectrum inversion method and subharmonic compensation are obtained, and a training model corresponding to the atmospheric environment is generated.

[0076] The atmospheric turbulence simulation model is constructed as follows:

[0077] Collect spot images of the target plate under different light sources, different distances, and different atmospheric environment parameters to construct training sets and validation sets; the samples in the sample set are required to have complete images, sufficient clarity, clean background, and as low image noise as possible. The processing of the initial samples includes the removal of duplicate samples, data enhancement, perfect annotation, and data division. The number of samples is not less than 5,000, and will be continuously supplemented in the future. The final state is planned to be no less than 30,000. The samples should cover common daily atmospheric environments as much as possible. The training set, validation set, and test set are divided in a ratio of 7:2:1.

[0078] The VGG network is trained with the training set to obtain the atmospheric turbulence simulation model, and the atmospheric turbulence simulation model is verified with the validation set. The training process mainly identifies and extracts information such as the probability and size of turbulence blocks under different environments, and then obtains the characteristics and parameters of the phase screen required for model construction according to the Fourier transform spectrum inversion principle. The loss function uses the common mean square error loss, which has good mathematical properties and fast convergence speed. It can quickly adjust parameters and reduce errors during training.

[0079] The specific implementation method of the present invention is to establish a systematic simulation model with the help of deep learning on the basis of the Fourier transform spectrum inversion method to simulate various situations. A data set with sufficient sample size is collected in advance, and the spot characteristics are extracted through the convolutional neural network. Through the training and verification of a large number of samples, the results obtained by the Fourier transform spectrum inversion method are corrected to obtain a simulation model that is more in line with the actual situation. The simulation model can select preset atmospheric turbulence parameters according to the input external environmental parameters to determine the internal and external scales and refractive characteristics of the turbulent block; and bring it into the calculation, and obtain the probability of turbulent blocks in turbulence, the location of occurrence, the size of turbulent blocks, and the optical properties of turbulent blocks (refractive index, scattering, absorption characteristics, etc.) through the identification and analysis of multiple samples. In the application of the simulation model, the number of refractive index turbulence blocks (including the situation where there are no turbulence blocks and multiple turbulence blocks), the location of the turbulence blocks, the size of the turbulence blocks, and the optical properties of the turbulence blocks in the light beam will be determined by random sampling according to the obtained probability during the propagation of the light beam, so as to realize the simulation of the general turbulence effect. Then, combined with the attenuation models and parameters of different weather conditions, the uneven light spot simulation of various situations can be realized, and the probability and location of the occurrence of atmospheric turbulence in the actual transmission process can be simulated to the greatest extent. Combined with the characteristics of the turbulence blocks, the simulation of the general turbulence blocks can be realized. The combination of multiple turbulence blocks realizes the simulation of the atmospheric turbulence effect.

[0080] The actual operation process is to select parameters such as actual weather conditions and visibility. The model algorithm will automatically simulate the impact of atmospheric turbulence on the light spot during actual transmission based on the parameters.

[0081] The present invention can also identify and analyze the brightness of the light spot according to the actual light spot pictures or samples collected, obtain the light spot intensity distribution, and perform simulation step by step according to the intensity of the actual light spot.

[0082] This method has multiple advantages. It overcomes the disadvantages of the original singleness and physical simplification of simulation based on mathematical model calculations. It integrates multiple interference factors, can improve the richness of various physical phenomena and effects in the actual environment, and greatly improves the authenticity of spot simulation. By integrating multiple laser sources with adjustable parameters, while maintaining the advantages of simple operation and low cost, the control accuracy of spot characteristics such as spot shape and intensity distribution is improved through the superposition of spots. A mature simulation model is adopted and fine-tuned to ensure that the simulation of various physical phenomena and effects in the process of light propagation is closer to reality, and the reliability and accuracy of spot simulation are guaranteed. At the same time, the simulation is performed by superposition of multiple light sources, and the simulation efficiency and accuracy are balanced, and a high level can be achieved at the same time, overcoming the shortcomings of the common point structure simulation spot method that efficiency and accuracy cannot be achieved at the same time.

[0083] The present invention has been described in detail above through embodiments, but the contents described are only exemplary embodiments of the present invention and cannot be considered to limit the scope of implementation of the present invention. The protection scope of the present invention is defined by the claims. Anyone who utilizes the technical solution described in the present invention, or a technician in the field, inspired by the technical solution of the present invention, designs a similar technical solution within the essence and protection scope of the present invention to achieve the above technical effects, or makes equal changes and improvements to the scope of application, shall still belong to the scope of protection covered by the patent of the present invention. It should be noted that in order to make a clear statement, the description of some components and processes that have no direct and obvious connection with the scope of protection of the present invention but are known to those skilled in the art are omitted in the description of the present invention.

Claims

1. A method for simulating an uneven light spot, characterized in that: Includes the following: The required number of laser sources is determined according to the light intensity distribution in the shape of the simulated uneven light spot, and multiple laser sources are arranged at the same laser emitting end. The center position of the light spot is controlled by adjusting the azimuth and pitch angle of each laser source, and the divergence angle, energy and intensity distribution of the light spot of each laser source are adjusted, so that different light spots irradiated on the target plate by different laser sources are staggered and superimposed to form different light intensity areas; The atmospheric attenuation coefficient of the atmospheric transmittance is calculated according to the atmospheric environmental parameters, and the laser intensity of the laser source at the laser emitting end is adjusted according to the atmospheric attenuation coefficient; An atmospheric turbulence simulation model is constructed. The atmospheric turbulence simulation model outputs the number of turbulent blocks appearing in the light beam, the location where the turbulent blocks appear, the size of the turbulent blocks, and the optical characteristics of the turbulent blocks in a random sampling manner according to the input atmospheric environment parameters, so as to simulate the influence of atmospheric turbulence, and adjust the laser source at the corresponding position in the light spot according to the output data of the atmospheric turbulence simulation model.

2. The method for simulating an uneven light spot according to claim 1, characterized in that: The atmospheric turbulence simulation model is constructed as follows: Collect spot image samples on the target board at different distances and different atmospheric environment parameters from different laser emission ends, perform data enhancement, complete annotation and data division on the collected samples, and construct training set, validation set and test set in a ratio of 7:2:1; The VGG network is trained using the training set to obtain the atmospheric turbulence simulation model, and the atmospheric turbulence simulation model is verified using the verification set. During the training process, the VGG network identifies and extracts the occurrence probability, size, position and optical characteristics of turbulent blocks under different environments, and then uses the Fourier transform spectrum inversion method to obtain the characteristics and parameters of the phase screen required to construct the atmospheric turbulence simulation model.

3. The method for simulating an uneven light spot according to claim 1, characterized in that: The multiple laser sources are controlled by the same signal source.

4. The method for simulating a non-uniform light spot according to claim 1, characterized in that: The multiple laser sources are controlled by different signal sources.

5. A non-uniform spot simulation device, used to implement the method of claim 1, characterized in that: The invention comprises a laser emission module, a target plate, an azimuth adjustment module, a power supply module and a comprehensive processing module. The laser emission module comprises a plurality of laser sources arranged together. The azimuth adjustment module is used to adjust the azimuth and pitch angle of each laser source. The power supply module provides power for the laser emission module, the azimuth adjustment module and the comprehensive processing module. The comprehensive processing module comprises a laser control unit, an atmospheric attenuation simulation unit and an atmospheric turbulence simulation unit. The laser control module is used to The atmospheric attenuation simulation unit calculates the atmospheric attenuation coefficient based on the atmospheric environment information. The atmospheric turbulence simulation unit simulates atmospheric turbulence according to the atmospheric environment information.

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