传感技术学报2012，Vol.25Issue(4)：505-509,5.DOI:10.3969/j.issn.1004-1699.2012.04.018
光幕测速法中微弱光信号的分析与检测
Analysis and Detection of Weak Optical Signal in Light Curtain Velocimetry
摘要
Abstract
A geometric model of the projectile through the light curtain is built and the edge extraction method is used to detect the weak optical signals. The designed analog circuit consists of three parts: the pre-processing circuit, the cascade filter amplifier and the rectifier circuit. Effective signals can be extracted by filtering the interference of natural light and insert noise. The method can overcome the impact of projectile properties and enhance the adaptability of detection system. Simulation results show that the circuit can effectively extract and amplify the weak optical signals, and the signal to noise ratio can reach up to 20 dB, meets the requirement of detection.关键词
光电检测/光幕法/微弱光信号/级联滤波Key words
photoelectric detection/ light curtain velocimetry/ weak optical signal/ cascade filter分类
信息技术与安全科学引用本文复制引用
王壮,蔡怀宇,黄战华,王铨..光幕测速法中微弱光信号的分析与检测[J].传感技术学报,2012,25(4):505-509,5.基金项目
国家高技术研究发展计划(863计划)项目(2008AA04Z134) （863计划）
