液位测量中超声回波信号的采集与处理  

Acquisition and Processing of Ultrasonic Echo Signal In Liquid Level Measurement

作　　者：焦冰[1,2] 唐慧强[2] 叶松[1] 温雅婷[1] 

机构地区：[1]解放军理工大学气象学院,江苏南京211101 [2]南京信息工程大学信息与控制学院,江苏南京210044

出　　处：《测控技术》2010年第8期27-29,34,共4页Measurement & Control Technology

基　　金：江苏高校高新技术产业发展项目(JHB05-17)

摘　　要：介绍了一种在液位测量中超声回波信号的采集与处理方法。系统选用高性能的ARM处理器LPC2119处理数据;设计了IIR椭圆带通数字滤波器进行数字滤波,去除干扰噪声;滤波后使用假设检验的方法检验回波信号样本波动性的显著变化,从而识别出回波信号的起始点。此方法可方便地推广到其他物位测量及气体、液体的流速测量中。A method about acquisition and processing of ultrasonic echo signal in liquid level measurement is introduced.The high-powered LPC2119 chip with ARM inner core is chosen as the system＇s processor.The IIR bandpass digital filter is designed to eliminate disturbance,significant change in fluctuation of echo signal sample is tested using the hypothesis testing in order to find the jumping off point of echo signal.This method can be promoted conveniently to other level measurement and velocity measurement of the gas or the liquid.

关 键 词：超声波液位测量 数字滤波 χ2检验 ARM处理器 

分 类 号：TP216.1[自动化与计算机技术—检测技术与自动化装置]