摘要
单光子探测器和时间相关单光子计数技术(TCSPC)被广泛运用于脉冲式激光测距及三维成像系统中。分析影响探测精度的因素有助于提高测距系统的性能。为此,建立了基于TCSPC单光子测距系统的理论模型,讨论分析了影响测距系统测量精度的因素,主要包括激光脉冲强度和回波信号统计波形的脉宽,其中后者由激光脉宽和探测器的时间抖动决定。并且利用蒙特卡洛法对测距系统的探测过程进行仿真,得到了上述因素对测量精度的具体影响情况。最后搭建了单光子测距的实验室实验系统,经过实验在10 m处的测量精度达到4 mm,对相同参数下的仿真结果进行了验证。
Single-photon detectors and time-correlated single-photon counting techniques have been widely used in pulse laser ranging system and three-dimensional imaging systems. Analyzing the factors influencing detection precision will improve the performance of ranging system. In this paper, a theoretical model of single photon ranging system based on TCSPC was established and the main factors affecting the accuracy was analyzed. The main factors included laser pulse intensity and pulse width of echo signal statistics waveform and the latter depended on laser pulse width and time jitter of detector. And simulation of the detection process by Monte Carlo method was used to get the specific influence of the above factors on measurement accuracy. Finally, an experimental single photon ranging system is built in lab. The system has an accuracy of 4 mm about the target 10 m away by experiment and the accuracy verifies the simulation results under the same parameters.
出处
《红外与激光工程》
EI
CSCD
北大核心
2014年第2期382-387,共6页
Infrared and Laser Engineering
基金
微光夜视技术重点实验室开放基金(J110508)
国家自然科学基金(61101196)
