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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.
A large dynamic range laser ranging method based on dual mode detection is developed.A single detector based on silicon avalanche photodiode (APD) is used to switch between linear mode and Geiger mode, the average photon number is 1 ~ 105 Based on this, we carried out the indoor linear detection mode ranging of 30m and the distance measuring experiment of outdoor geiger detection mode of 500m, and the signals recorded by the time-correlated single-photon counting device were analyzed in detail It is proved that this method can switch the detection modes according to the detection range and the background environment to realize the laser range measurement with large dynamic range.And the influence of APD bias voltage adjustment on the measurement accuracy As well as the impact of detecting background noise.