基于双模式探测器的大动态范围激光测距

开发了一种基于双模式探测的大动态范围激光测距方法.使用基于硅雪崩光电二极管（APD）的单个探测器在线性模式与盖革模式之间切换,实现了平均光子数为1~105的大动态强度范围光信号探测.在此基础上,进行了30m的室内线性探测模式测距和500m的室外盖革探测模式测距实验,利用时间相关单光子计数设备记录的信号详细分析了两种模式测距的时间特性,证明了这种方法可以根据探测距离和背景环境进行探测模式切换,从而实现大动态范围激光测距.并且进一步分析了APD偏置电压的调节对测距系统测量精度以及探测背景噪声的影响.

Stable single-photon detection based on Si-avalanche photodiode in a large temperature variation range

In this paper, we present a stable single-photon detection method based on Si-avalanche photodiode(Si-APD) operating in Geiger mode with a large temperature variation range. By accurate temperature sensing and direct current(DC) bias voltage compensation, the single-photon detector can work stably in Geiger mode from-40 °C to 35 °C with an almost constant avalanche gain. It provides a solution for single-photon detection at outdoor operation in all-weather conditions.