基于分集接收的单光子探测技术

Single Photon Detection Based on Diversity Reception

单光子三维探测技术因为在微弱信号目标的光学探测方面的独特优势,在空间目标探测、空中目标侦查、远距离预警探测等方面有重要应用,近年来获得了广泛关注;对主动扫描成像的单光子探测系统,为扩展作用距离和提高扫描速度,接收口径和接收视场角不断增大;但对高集成的盖革APD型的单光子探测器,大接收口径和大接收视场带来背景噪声光子数量的增大,这会导致探测器频繁进入死区,给扫描图像带来大量盲点;针对此问题,提出和通过仿真证明,利用多镜头分集接收和联合单光子信息处理,可实现对单光子探测器死区时间抑制,进而有效提高系统探测概率,降低扫描图像的盲点数量,并通过试验系统进行了验证。

Due to its unique advantages in optical detection of weak signal targets,single photon three-dimensional detection technology has important application prospects in space target detection,aerial target detection,long-distance early warning detection,and has received widespread attention in recent years.For active scanning imaging single photon detection systems,to expand the operating range and improve scanning speed,the receiving aperture and receiving field of view angle continue to increase.However,for highly integrated Geiger APD single photon detectors,the large receiving aperture and field of view bring an increase in the number of background noise photons,which can cause the detector to frequently enter the dead zone and bring a large number of blind spots to the scanned image.In response to this issue,it is pro-posed that using multi lens diversity reception and joint single photon information processing can achieve suppression of the dead time of single photon detectors,thereby effectively improving the detection probability of the system and reducing the number of blind spots in scanned images.This has been verified through simulation and experimental systems.