液位测量中的信号采集与处理  

Acquisition and Processing of Signal in Liquid Level Detecting System

作　　者：杨雷[1] 王彩申 卢广建[3] 

机构地区：[1]东莞理工学院电子系 [2]郑州万迪来光机电有限公司 [3]河南省气象局

出　　处：《微计算机信息》2006年第04S期177-180,共4页Control & Automation

基　　金：河南省科技攻关计划"环境智能化监控网络系统"(编号0124140203)资助。

摘　　要：在超声波探头上施加一电脉冲信号,探头发出超声波,在遇到不同介质界面时被反射,超声波探头接收回波并将之变为电脉冲信号。利用P89LPC935的捕捉功能测量发射波和回波之间的时间间隔,通过环境温度测量准确测量出超声波传播速度,进而测量出超声波的传输距离,通过这种方法测量出液位高度。The ultrasonic detector gives off an ultrasonic wave when it is given an electronic pulse. This ultrasonic wave is rejected at the interface of two kinds of media. The ultrasonic detector receives this wave and converts it into electronic pulse. The time between the send pulse and the back pulse can be acquired by means of the capture function of the MCU P89LPC935. The velocity can be calculated by temperature measurement. Then the distance can be detected by means of the time and the velocity, Liquid level can be detected by this way.

关 键 词：P89LPC935 超声波探头 温度 液位 液位测量 信号采集 

分 类 号：TP274.2[自动化与计算机技术—检测技术与自动化装置]