基于PCI-4472的声波传播时间测量系统  

Design of Sound Travel-time Measurement System Based on PCI-4472

作　　者：颜华[1] 张玉艳[1] 王善辉[1] 

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

出　　处：《仪表技术与传感器》2014年第11期59-61,共3页Instrument Technique and Sensor

基　　金：国家自然科学基金(60772054;61372154);高等学校博士学科点专项科研基金(20102102110003);辽宁省高等学校优秀人才支持计划(LR2013005)

摘　　要：为提高声学CT法温度场重建精度,设计了具有16个声波数据采集通道的声波传播时间测量系统。该系统以LabVIEW为软件设计平台,用2块PCI-4472动态信号采集卡实现16通道的高速同步采集。系统提供互相关、抽样率变换结合互相关两种时延估计法,用于声波传播时间测量。测试结果表明:系统能按照设计构想正常运行,各路径声波传播时间测量值稳定,抽样率变换结合互相关法可获得更高的传播时间测量精度。在该系统中嵌入适当的温度场重建算法便可实现声学CT温度场测量。In order to improve the accuracy of temperature field reconstruction by acoustic tomography, this paper designed a sound travel-time measurement system with 16 sound data acquisition channels. The system took LabVIEW as its software design platform. The high speed synchronous acquisition of the 16 channels was achieved by using two PCI -4472 dynamic signal acquisition cards. The system provided two time-delay estimation methods for measuring the sound travel-times, i. e. cross-correlation method and cross-correlation combined up-sampling method. Experiment results indicate that the system can work as designed, and the sound travel-time measurement values along the various sound paths are stable. Higher travel-time measurement accuracy can be acquired by the cross-correlation combined up-sampling method. Embedding proper temperature field reconstruction algorithms into the system, the temperature field measurement can be realized based on acoustic tomography.

关 键 词：声波传播时间测量 PCI-4472 声学CT 温度场 虚拟仪器 LABVIEW 时延估计 同步数据采集 

分 类 号：TB52[理学—物理]