基于热释电器件的车流量监测  

Vehicle Flow Detection Based on Pymelectric Infrared Sensor

作　　者：梁锡方 揭海 罗琼 张成云[1] LIANG Xifang;JIE Hai;LUO Qiong;ZHANG Chengyun(School of Physics and Electronic Engineering,Guangzhou University,Guangzhou 510006,China)

机构地区：[1]广州大学物理与电子与工程学院

出　　处：《大学物理实验》2019年第6期59-62,共4页Physical Experiment of College

基　　金：广州省教育厅创新强校项目(自科类)(2018KTSCX178);广州大学2019年度校级教育教学研究项目(JY201940)

摘　　要：设计了一个基于热释电器件的路面车流量监测系统。由热释电红外传感器微弱信号处理与放大电路、实时时钟电路、STC89C52单片机及其外围电路构成。将该系统放置在路边合适位置,当有车辆经过时,利用菲涅尔透镜良好的聚焦性能,一定间距分布的两组热释电探头先后感应接收到车辆辐射的红外信号,通过时钟电路计算两组红外信号的时间间隔来判断经过的是否为车辆,计数结果显示在12864液晶屏上。通过现场实测,该系统可以实现车流量的在线监测,具有较高的性价比。A vehicle flow detection system is designed on the base of the pymelectric infrared devices.It consists of a weak signal processing and amplification circuit of pymelectric infrared sensor,real-time clock circuit,STC89C52 microcomputer and its peripheral circuit.The system is placed at an appropriate location of the road side,and when a car passes by the detection area,the system composed by two sets of pymelectric detectors with a certain spacing can well receive successively the infrared radiation emitted by the vehicle because of the good focusing ability of Fresnel lens.The time interval between two sets of infrared signals is calculated by the clock circuit to judge whether the vehicle is passing by.The result will be shown on the 12864 LCD screen.Through the outside tests,the system can realize the on-line inspection of traffic flow,and has a higher ratio of quality to price.

关 键 词：热释电器件 车流量监测 红外监测 

分 类 号：TN215[电子电信—物理电子学]