激光雷达的单光子计数器计数实现  

Counting Achievement of Lidar's Single Photon Counter

作　　者：梅文华[1,2] 刘建国[1] 张天舒[1] 付毅宾[1] 

机构地区：[1]中国科学院安徽光学精密机械研究所中国科学院环境光学与技术重点实验室,安徽合肥230031 [2]中国科学院研究生院,北京100039

出　　处：《大气与环境光学学报》2012年第5期364-369,共6页Journal of Atmospheric and Environmental Optics

摘　　要：单光子计数器作为激光雷达的数据采集部件,目的是实现对PMT输出脉冲信号的计数,并把数据实时上传给计算机。鉴于脉冲信号上升时间短、数据量大,本系统选用CPLD作为计数器和控制器,采用门控双通道无缝计数方法,可实现50 ns的门宽分辨率。用一片32 K×16 bit的SRAM做缓存,可满足每50 ns的时间分辨率最大65535次的计数。采用USB作为数据传输接口,可以很好地满足高速、实时的设计要求。As the data acquisition component of lidar, single photon counter is designed to achieve the PMT output pulse signal count, and real-time upload the data to the computer. Because the rise time of the pulse signal is very short and the volume of data is very large, using CPLD as the counter and controller, using gated dual channel seamless counting method, the system can achieve 50 ns gate width resolution. Using a piece of 32 K × 16 bit SRAM as cache can meet the requirements of maximum counts of 65535 per 50 ns time resolution. Using the USB as data transmission interface can meet the design requirements of high speed and real-time very well

关 键 词：单光子计数 激光雷达 瞬态记录仪 CPLD 

分 类 号：TN958.98[电子电信—信号与信息处理]