一种抗反射波干扰的声波传播时间测量系统  

Anti-echo Interference Measurement System for Acoustic Travel-time

作　　者：颜华[1] 马钊[1] 王晓宁[1,2] 

机构地区：[1]沈阳工业大学信息科学与工程学院,辽宁沈阳110870 [2]沈阳大学信息工程学院,辽宁沈阳110044

出　　处：《仪表技术与传感器》2016年第11期35-38,45,共5页Instrument Technique and Sensor

基　　金：国家自然科学基金(60772054;61372154);辽宁省高等学校优秀人才支持计划资助项目(LR2013005)

摘　　要：针对声学法测温中普遍存在的混响问题,提出一种基于波峰辨识的抗反射波干扰的声波传播时间测量法。在此基础上,设计了一套声波传播时间测量系统。系统以LabVIEW为软件平台,采用了LabVIEW与MATLAB混合编程技术。以扬声器、传声器、前置放大器、功率放大电路、扬声器选通电路、信号调理器、数据采集模块和带声卡的计算机构成硬件系统。实现了声波信号的产生、发射和接收、采集和传播时间计算的全过程。测试结果表明:文中算法在强反射波干扰下,仍可获得稳定的声波传播时间测量值。在系统中嵌入适当的温度场重建算法,可实现非接触的温度场监测。Aiming at reverberation phenomenon ubiquitous in acoustic temperature measurement, an anti-echo interference measurement method for acoustic travel-time was proposed based on peak recognition.An acoustic travel-time measurement system was designed and developed. LabVIEW was used as the software design platform. Mixed programming with LabVIEW and MATLAB was used.The hardware system was composed of speakers, microphones, preamplifiers, power amplifier circuit, speaker gating circuit, signal conditioner, data acquisition module and personal computer with a sound card.The whole process of sound generating, transmitting and receiving, data acquiring and travel-time calculating were realized automatically.Test results show that the measurement values of acoustic travel-time acquired by the proposed method are stable even in strong reflection interference. As a result, non-contact temperature field monitoring can be realized by embedding proper temperature reconstruction algorithms into the system.

关 键 词：传播时间测量 抗反射波干扰 声学法测温 波峰辨识 LABVIEW 互相关 测量系统 

分 类 号：TP273[自动化与计算机技术—检测技术与自动化装置]