红外测量在车流量监测中应用.PDF

第30 卷 第4 期 红 外 技 术 Vol.30 No.4 2008 年4 月 Infrared Technology Apr. 2008 红外测量在车流量监测中的应用 艾 红，孙 硕 （北京信息科技大学自动化学院控制工程系，北京 100085） 摘要：介绍了基于红外传感器的车流量监测系统的总体方案以及软硬件设计。说明了红外传感器的选 择以及菲涅尔透镜应用。红外传感器经过两级放大后，与窗口比较器进行比较产生脉冲进入单片机电 路。通过对脉冲序列的分析和判断，得到通过车辆数。该系统采用红外传感器检测是否有车辆通过， 可以将探头放置在公路的适当位置，车辆通过时会引起传感器输出的变化从而监测道路情况，测量该 路段的车流量并将测量结果显示在屏幕上。文中说明了道路测试结果，并给出测试波形。阐述了车辆 的计数流程图。并进行了车流量监测系统显示程序设计。本系统的软件设计部分用C51 编写，设计程 序实现了液晶屏显示等功能，C 语言与汇编语言相比其可读性更强，使用也更简洁。在车流量监测系 统中，基于红外传感器能够较好地实现了车流量的显示。 关键词：车流量；红外传感器；检测放大；液晶显示 中图分类号：TP277 文献标识码：A 文章编号：1001-8891(2008)04-0201-04 Application of Infrared Measurement in Flow Rates of Vehicles AI Hong，SUN Shuo (Automation Institute of Beijing Information Science Technology University, Beijing 100085, China) Abstract ：A kind of system including software and hardware design which is used to monitor the flow rates of vehicles based on the infrared sensor is included. The choice and the application of lens are illustrated. After the signals of infrared sensor are magnified and compared, the generated pulse comes into MCU. Through analyzing and judging the pulse sequences, the number of vehicles can be obtained. The principle of this system is to detect whether the vehicles has passed by using pyroelectric infrared sensor. Puting the infrared detector on an appropriate position on the needed road, the output of the sensor would give rise to change because of the variation of the passing vehicles. We can get the measured result and see the approximate statistics of the passing vehicles from the display of this instru