基于电路相移的超声波信号调理电路时延特性研究  

Research on Time Delay Characteristics of Ultrasonic Signal Processing Circuit Based on Circuit Phase Shift

作　　者：张恒[1] 宋寿鹏[1] 

机构地区：[1]江苏大学机械工程学院,江苏镇江212013

出　　处：《仪表技术与传感器》2014年第1期93-95,110,共4页Instrument Technique and Sensor

基　　金：江苏大学现代农业装备与技术重点实验室开放基金项目(No.NZ200807);江苏省高校自然基金项目(No.08KJD460016)

摘　　要：在利用超声波进行精确检测时,通常通过测量超声波时延的精确变化来得到被测参量的变化。然而,影响超声波精确时延测量的因素有很多。除了被测参量引起的时延变化外,电路系统相移响应特性引起的时延变化也不容忽视。特别是超声波微参量检测时,电路系统本身引起的时延变化大于被测参量引起的时延变化成为制约超声波时延精确检测的瓶颈。为了提高检测精度,研究电路相移引起的时延变化非常迫切。文中在设计超声波信号调理电路的基础上,对其进行相频特性建模与仿真,得到了其相移特性对时延变化的影响规律,为超声波精确检测系统中消除电路相移引起的时延变化量提供了依据。In generally ultrasonic accurate measurement,the measured parameters are obtained by means of accurate determination of the time delay.However,the accurate determination of the time delay is affected by many factors.Besides the changes of the time delay caused by the measured parameters,the changes of the time delay caused by the phase shift characteristics of the circuit systems can not be ignored.Especially in ultrasonic micro-parameter measurement,the changes of the time delay caused by circuit systems greater than the measured parameters becomes a bottleneck what restricts the accurate detection of the ultrasonic time delay.In order to improve the detection accuracy,the study of the time delay variation caused by the ultrasonic signal processing circuit is very urgent.In this paper,modeling and simulation of the phase frequency characteristics are made on the basis of the designing of the ultrasonic signal processing circuit,and the time delay variation caused by the characteristics of the phase shift was revealed.This provides a basis for the accurate detection systems to eliminate the amount of time delay variation caused by the phase shift of circuits.

关 键 词：超声波 时延 信号调理电路 相移特性 

分 类 号：TP202[自动化与计算机技术—检测技术与自动化装置]