基于纳秒脉冲激光二极管的高精度单光子测距  

High-Precision Single-Photon Ranging with Nanosecond Pulsed Laser Diode

作　　者：陆思诺 李召辉[1] 陈修亮[1] 吴光[1] Lu Sinuo;Li Zhaohui;Chen Xiuliang;Wu Guang(State Key Laboratory of Precision Spectroscopy,East China Normal University,Shanghai 200241,China)

机构地区：[1]华东师范大学精密光谱科学与技术国家重点实验室,上海200241

出　　处：《激光与光电子学进展》2025年第1期183-188,共6页Laser & Optoelectronics Progress

基　　金：国家自然科学基金(62075062,62175067);上海市教育发展基金会和上海市教育委员会“晨光计划”(21CGA31)。

摘　　要：基于单光子探测的激光测距(单光子测距)通常采用脉冲飞行时间法,通过测量激光脉冲发射时刻与回波光子到达时刻,得到目标距离。为了获得高测距精度,需要使用窄脉冲激光、高精度探测器和事件计时器,导致系统成本大幅上升。介绍了一种低成本的单光子激光测距方法,提出移动窗口累加的互相关算法,有效提升较大时间抖动系统的测距精度。实验中,采用脉冲宽度为2.18 ns的激光二极管光源,时间抖动为0.80 ns的硅雪崩光电二极管单光子探测器,通过互相关计算,将光子飞行时间测量精度提升至0.13 ns,单程测距精度达到4.0 cm。Laser ranging based on single-photon detection(single-photon ranging)usually employs pulse time-of-flight method,whereby the target distance is obtained by measuring the time of emission of the laser pulse and time of arrival of the echo photon.To achieve high ranging precision,a narrow-pulse laser with low timing jitter,a high-precision detector,and an event timer are required,which significantly increases the system cost.In this paper,we introduce a low-cost single-photon laser ranging method and propose a cross-correlation algorithm for moving-window accumulation,thereby effectively improving the ranging precision of larger timing jitter systems.In the experiment,a laser diode light source with a pulse width of 2.18 ns and a silicon avalanche photodiode single-photon detector with a timing jitter of 0.80 ns were used.The photon time-of-flight measurement precision improved to 0.13 ns,and the unidirectional ranging precision reached 4.0 cm,using the cross-correlation algorithm.

关 键 词：单光子测距 激光测距 单光子探测器 互相关算法 

分 类 号：TN214[电子电信—物理电子学]