The laser three-dimensional imaging system has the advantages of rich information acquisition and fewer working conditions, which is a hot spot in the research of imaging methods. Pulse ranging laser 3D imaging obtains the relative distance between the imaging system and the target through the photon flight time. Although the distance resolution is usually on the order of centimeters, the working distance range is large, which can meet the working distance range and accuracy of laser 3D imaging at the same time. Demand. The three-dimensional imaging of array detectors such as APD array can significantly improve the three-dimensional imaging performance of the system, but the detector is limited by the area of the photosensitive area, and the energy utilization efficiency is still low. This article combines the requirements of the receiving optical system in the APD array three-dimensional imaging system to improve the energy transmission efficiency. First, it outlines the principle and basic composition of the microlens array to improve the energy transmission efficiency, and then briefly describes the microlens distribution size and focal length. The design constraints of the microlens. Finally, for the two cases of whether the microlens array is used or not, the difference in the efficiency of the receiving optical system is compared and analyzed. The analysis results can provide a certain reference for the design of APD array three-dimensional imaging.
The laser three-dimensional imaging method of the area array detector has the advantages of high imaging efficiency and good imaging effect of moving targets. It is a hot spot of imaging research at present. However, at present, the number of pixels of area array detectors is generally small, and it is difficult to meet the requirements of high spatial resolution threedimensional imaging. The beam array scanning method can effectively solve the problem of the small number of pixels of the area array 3D imaging detector such as the APD array, and significantly improve the imaging performance of the system. In the beam array scanning method, the processing of laser echo data and the restoration of the target threedimensional point cloud are one of the key technologies for the realization of the beam array scanning method. In response to this problem, the paper studies the correspondence between the beam deflection angle and the target position in the beam array scanning, and realizes the conversion of the system detector coordinate system data to the spatial coordinate system.
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