基于SNSPD与APD探测器的激光测距系统的比较
Received:August 02, 2017  Revised:January 31, 2018  点此下载全文
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Author NameAffiliationE-mail
ZHANG Xiao-Ying School of Electrical and Information Engineering, Lanzhou University of Technology 245659219@qq.com 
JIA Lei School of Electrical and Information Engineering, Lanzhou University of Technology jialei_2125@163.com 
ZHU Jiang Superconducting Electronics Research Institute, Nanjing University  
基金项目:国家自然科学基金项目(面上项目,重点项目,重大项目)
中文摘要:摘 要:本文通过实验比较研究了基于SNSPD与SPAD探测器的激光测距系统。该实验中,当接收回波端衰减120dB时,天空光背景可忽略,基于SPAD的激光测距系统探测概率低于0.2%,而基于SNSPD的激光测距系统探测概率达35%;当激光发射频率低于1kHz,基于SNSPD的激光测距系统探测概率比SPAD高60%以上。研究表明:在探测弱信号回波光子时,SNSPD的探测性能远远优于SPAD,其原因是SNSPD具有较低的暗计数和高探测概率。与此同时,在接收端无衰减情况下,天空光背景会带来暗计数,影响测距系统信噪比。通过仿真分析表明,当背景亮度L_0高于30W?((m^2?sr) )时,该基于SNSPD的激光测距系统的信噪比低于6,可能影响测距系统稳定探测。
中文关键词:超导纳米线单光子探测器,激光测距,光子计数,暗计数,天光背景
 
Comparison of laser ranging system based on SNSPD and SPAD detector
Abstract:In this paper, the laser ranging system based on SNSPD and SPAD detector is compared by experiments. In the experiments, the sky light background can be ignored when the receive echo is attenuated to 120dB, the detection probability of SPAD is less than 0.2%, while the detection probability of SNSPD is 35%. When the laser emission frequency is below 1kHz, the detection probability of SNSPD is more than 60% higher than that of SPAD. The researches show that the detection performance of SNSPD is much better than that of SPAD when detecting the weak signal echo photon. The reason is the lower dark counts and higher detection probability of SNSPD. At the same time, there is no decay at the receiving end, the sky light background will bring dark counts affecting the signal-to-noise ratio of the laser ranging system. The simulation analysis shows that the signal-to-noise ratio of the system based on SNSPD is lower than 6 when the background brightness is higher than 30W?((m^2?sr) ), it may affect the stable detection of the laser ranging system.
keywords:Superconducting nanowire single photon detector  Laser ranging  Photon counting  Dark count  skylight background
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Copyright:《Journal of Infrared And Millimeter Waves》