| 基于互相关和插值运算的声波飞行时间测量 |
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| 引用本文： | 颜华,彭珍. 基于互相关和插值运算的声波飞行时间测量[J]. 沈阳工业大学学报, 2008, 30(6): 662-666 |
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| 作者姓名： | 颜华 彭珍 |
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| 作者单位： | 沈阳工业大学,信息科学与工程学院,沈阳,110178 |
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| 基金项目： | 国家自然科学基金资助项目(60772054); 辽宁省教育厅高等学校科学研究资助项目(05L280) |
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| 摘 要： | 为了实现声学法温度场监测中声波飞行时间的高精度测量，介绍了声学法温度场检测原理与系统组成.提出了基于互相关和插值运算的声波飞行时间测量法.Matlab环境下的仿真研究表明：受采样间隔的限制，直接对发射端和接收端采样信号作互相关并寻峰，所确定的声波飞行时间精度较低；为获得更准确的声波飞行时间，弱噪声情况下，可对发射端和接收端采样信号的互相关函数在峰值附近做三次样条插值，细化后再次寻峰；中、强度噪声情况下，可对发射端和接收端采样信号做线性插值，细化后再做互相关和寻峰.该方法对提高声学法温度场检测精度具有实际意义.
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| 关 键 词： | 声学法测温 互相关 声波飞行时间 线性插值 三次样条插值 |
Acoustic travel-time measurement based on cross-correlation and interpolation |
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| YAN Hua,PENG Zhen. Acoustic travel-time measurement based on cross-correlation and interpolation[J]. Journal of Shenyang University of Technology, 2008, 30(6): 662-666 |
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| Authors: | YAN Hua PENG Zhen |
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| Abstract: | In order to measure acoustic travel-time accurately for acoustic temperature field monitoring,the measuring principle and system structure for acoustic temperature field were described.A kind of acoustic travel-time measuring method based on cross-correlation and interpolation was proposed.The simulation research in Matlab environment shows that the accuracy of acoustic travel-time measured by direct cross-correlation of the transmitted and received sampling signals is restricted by the sampling interval.Th... |
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| Keywords: | acoustic temperature measurement cross-correlation acoustic travel-time linear interpolation cubic spline interpolation |
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