Analysis of the influence of microlens array on energy efficiency in APD array receiving system

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.