激光主動層析探測成像時空特性仿真分析
[Abstract]:Laser detection technology has been widely used in underwater detection, meteorological monitoring and other fields. On the other hand, the laser active tomography is used to separate the laser from the imaging process through the switch of the electron gate, and the whole process of the laser along the path is decomposed into multiple slice images in the range of different distances. By using this imaging method, the light scattering and scintillation of atmospheric media in the process of laser propagation are greatly reduced, and the signal-to-noise ratio (SNR) of the imaging is greatly improved. And different sequential slice images contain the range information in detection. Processing and analysis of different sequential slice images is helpful to the 3D reconstruction of target detection in the later stage. In summary, the whole process of laser active tomography detection is simulated. Considering the space-time characteristic of laser transmission link, a mathematical model related to time domain and space echo energy in laser tomography detection is established in this paper. The imaging results of simple 3D target are compared with Monte Carlo method (MCM). In this paper, the spatial distribution of echo energy and the final tomography results of two simple 3D targets under different laser pulse widths and gated widths are analyzed and studied by using the simulation program. Using the centroid method, the 3D reconstruction of a number of simulated slice images is carried out. In order to analyze the energy transmission characteristics of laser in space during active detection, the optical properties of different aerosol particles are calculated and analyzed by electromagnetic software. Finally, the database of optical properties of different particles and the call model in the simulation program are established. The algorithm models of laser transmission and energy attenuation are improved by calling the database of optical properties of different particles, which provides a data basis for the calculation of laser energy transmission process. In order to establish a complete tomography simulation platform, aiming at the problems of imaging of complex 3D detection model, attenuation of atmospheric medium and echo detection and 3D reconstruction of target, etc. In this paper, a three-dimensional model of the building near the school is established to simulate the imaging under different parameters, and the sequence of slice images obtained under different parameters is reconstructed, and the merits and demerits of the reconstruction results and the influencing factors are evaluated. It provides the simulation data basis for the parameter selection and system design of laser active tomography detection experiment.
【學位授予單位】:哈爾濱工業(yè)大學
【學位級別】:碩士
【學位授予年份】:2017
【分類號】:TN249
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