摘要
激光脉宽作为二维激光告警系统中的一个重要参数,便捷准确获得激光的脉宽信息在光电测量技术的研究中变得越来越重要。高速光电探测器的响应时间以及时间数字转换电路(TDC)的分辨率等参数指标直接影响着激光脉宽测量系统的测量精度和灵敏度。针对微小型二维激光告警中对于军用激光脉冲宽度测量的需要,设计了高速光电探测电路,并且基于Xilinx Artix-7系列现场可编程门阵列(FPGA)芯片设计了以进位链为延时单元的皮秒级别分辨率的时间间隔测量系统来实现激光脉冲信号时间间隔的测量,该系统分别测量了脉冲激光器发出的从50 ns到2 000 ns的脉冲宽度,测量精度达到纳秒级别,测量波段800 nm~1 700 nm,时间数字转换电路最小延时单元66 ps。最后,通过与其他激光脉冲宽度测量方案对比体积小、结构简单,且该系统稳定性和脉宽测量精度均能达到了实际应用要求,可应用于微小型二维激光告警系统。
Laser pulse width is an important parameter in a two-dimensional laser alarm system. It is more and more important to obtain laser pulse width information conveniently and accurately in the research of photoelectric measurement technology. The response time of high-speed photodetector and the resolution of time digital conversion circuit(TDC) directly affect the measurement accuracy and sensitivity of laser pulse width measurement system. For the need of military laser pulse width measurement in the micro-miniature two-dimensional laser alarm, a high-speed photoelectric detection circuit is designed, and a picosecond resolution time interval measurement system with carry chain as delay unit is designed based on Xilinx Artix-7 series field programmable gate array(FPGA) chip to realize the measurement of laser pulse signal time interval.The system can measures the pulse width from 50 ns to 2 000 ns emitted by the pulse laser andthe measurement accuracy reaches the nanosecond level. The measurement band is 800 nm to 1 700 nm, and the minimum delay unit of time digital conversion circuit is 66 ps. Finally, compared with other laser pulse width measurement schemes, the system has small volume and simple structure, and the stability and pulse width measurement accuracy of the system can meet the requirements of practical application. It can be applied to micro two-dimensional laser warning system.
作者
石金
张瑞
程亚昊
吴琼
杜伟豪
牛家麒
王志斌
SHI Jin;ZHANG Rui;CHENG Yahao;WU Qiong;DU Weihao;NIU Jiaqi;WANG Zhibin(School of Instrument and Electronics,North University of China,Taiyuan 030051,China;Academy for Advanced Interdisciplinary Research,North University of China,Taiyuan 030051,China;Nantong Institute of Intelligent Opto-Mechatronics,North University of China,Nantong Jiangsu 710065,China)
出处
《激光杂志》
CAS
北大核心
2022年第10期51-55,共5页
Laser Journal
基金
国家自然科学基金(No.62105302)
山西省自然科学基金(No.201901D111145、201901D111158)。
关键词
脉宽测量
时间数字转换电路
光电探测
激光告警
pulse width measurement
time digital conversion circuit
photoelectric detection
laser alarm
