| 有限空间液态场中声发射信号时延估计方法 |
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| 引用本文： | 徐耀松,李一博,付铜玲,靳世久.有限空间液态场中声发射信号时延估计方法[J].压电与声光,2012,34(5):652-656. |
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| 作者姓名： | 徐耀松 李一博 付铜玲 靳世久 |
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| 作者单位： | 1. 天津大学 精密测试技术及仪器国家重点实验室,天津300072;辽宁工程技术大学电气与控制工程学院,辽宁葫芦岛125105
2. 天津大学 精密测试技术及仪器国家重点实验室,天津,300072 |
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| 基金项目： | 国家基金面上基金资助项目(61074181);天津市应用基础及前沿技术研究计划基金资助项目(09JCYBJC02200);辽宁省教育厅基金资助项目(L2012119) |
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| 摘 要： | 石油储罐罐底腐蚀的定位可利用声发射信号的时延估计实现,但在有限空间液态场中信号的传播会产生严重的多途效应,对准确进行时延估计产生不利影响.提出一种基于信号截取的广义互相关时延估计方法.采用曲线拟合法对每路传感器采集信号进行波达时刻估计,然后进行信号截取,对两路传感器截取信号进行基于相位变换的广义互相关,实现信号的时延估计.实验结果表明,该方法能有效克服多途干扰,提高时延估计性能.
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| 关 键 词： | 声发射 多途效应 时延估计 曲线拟合 广义互相关 |
Time Delay Estimation Method of Acoustic Emission Signals in Confined Underwater Space |
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| XU Yaosong,LI Yibo,FU Tongling and JIN Shijiu.Time Delay Estimation Method of Acoustic Emission Signals in Confined Underwater Space[J].Piezoelectrics & Acoustooptics,2012,34(5):652-656. |
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| Authors: | XU Yaosong LI Yibo FU Tongling and JIN Shijiu |
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| Affiliation: | 1(1.State Key Lab.of Precision Measuring Technology and Instruments,Tianjin University,Tianjin 300072,China; 2.Faculty of Electrical and Control Engineering,Liaoning Technical University,Huludao 125105,China) |
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| Abstract: | Time delay estimation (TDE) of acoustic emission signals can be used to locate the corrosion in oil storage tank bottom. Multipath propagation is inevitable and affects the accuracy of TDE in a confined underwater space. A new time delay estimation method based on generalized cross correlation with truncated signals was proposed. Curve fitting was used to estimate the time of arrival of the received signals. The signals were truncated to suppress multipath and generalized cross correlation based phase transform (PHAT) was applied to estimate the time delay. Experimental results show that the method can reduce the effect of multipath effectively and improve the performance of TDE. |
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| Keywords: | acoustic emission multipath time delay estimation curve fitting generalized cross correlation |
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