Spatio-temporal deconvolution of pulsed ultrasonic fields received by a transducer of linear aperture : a simulation study

W. Djerir, T. Boutkedjirt, M. O. Si-chaib, H. Djelouah
{"title":"Spatio-temporal deconvolution of pulsed ultrasonic fields received by a transducer of linear aperture : a simulation study","authors":"W. Djerir, T. Boutkedjirt, M. O. Si-chaib, H. Djelouah","doi":"10.1109/ULTSYM.2005.1603212","DOIUrl":null,"url":null,"abstract":"In ultrasonic field measurements, the signal delivered by the receiving transducer is affected by the receiver spatio temporal transmission properties. The pressure is spatially averaged over its finite-size aperture. Furthermore, frequency variations of its transfer function may distort the output signal. The efficiency of the deconvolution of these effects is shown by means of numerical simulations. The pulsed pressure field radiated by a wideband 10.3mm-radius planar transducer, with a central frequency fc = 2.25 MHz ( c: corresponding ultrasonic wavelength in water) is considered. The receiver is a linear aperture 25 μm- thick PVDF membrane hydrophone. The study shows that the quality of the reconstructed signal depends strongly upon the signal-to-noise ratio (SNR), the aperture dimensions and the distance from the source. For an aperture of length L = 2.6 mm ≈3.9c, placed on axis at z = 3 mm, correlation coefficients between the reconstructed pressure and the original one, rppˆ , of 0.999, 0.988 and 0.655 have been obtained, for SNRs of 60, 40 and 20 dB respectively. For a greater aperture (L = 4.6=mm ≈6.9c) and SNR = 40 dB, no satisfactory results could be obtained at this distance ( rppˆ = 0.912). At a greater axial distance (z = 20 mm), better deconvolution results could be achieved ( rppˆ = 0.928).","PeriodicalId":302030,"journal":{"name":"IEEE Ultrasonics Symposium, 2005.","volume":"2 1","pages":"0"},"PeriodicalIF":0.0000,"publicationDate":"2005-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"3","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"IEEE Ultrasonics Symposium, 2005.","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1109/ULTSYM.2005.1603212","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 3

Abstract

In ultrasonic field measurements, the signal delivered by the receiving transducer is affected by the receiver spatio temporal transmission properties. The pressure is spatially averaged over its finite-size aperture. Furthermore, frequency variations of its transfer function may distort the output signal. The efficiency of the deconvolution of these effects is shown by means of numerical simulations. The pulsed pressure field radiated by a wideband 10.3mm-radius planar transducer, with a central frequency fc = 2.25 MHz ( c: corresponding ultrasonic wavelength in water) is considered. The receiver is a linear aperture 25 μm- thick PVDF membrane hydrophone. The study shows that the quality of the reconstructed signal depends strongly upon the signal-to-noise ratio (SNR), the aperture dimensions and the distance from the source. For an aperture of length L = 2.6 mm ≈3.9c, placed on axis at z = 3 mm, correlation coefficients between the reconstructed pressure and the original one, rppˆ , of 0.999, 0.988 and 0.655 have been obtained, for SNRs of 60, 40 and 20 dB respectively. For a greater aperture (L = 4.6=mm ≈6.9c) and SNR = 40 dB, no satisfactory results could be obtained at this distance ( rppˆ = 0.912). At a greater axial distance (z = 20 mm), better deconvolution results could be achieved ( rppˆ = 0.928).
线性孔径换能器接收脉冲超声场的时空反卷积:仿真研究
在超声场测量中,接收换能器传递的信号受接收机时空传输特性的影响。压力在其有限尺寸的孔径上进行空间平均。此外,其传递函数的频率变化可能会使输出信号失真。数值模拟表明了这些效应的反褶积的有效性。考虑了中心频率fc = 2.25 MHz(c为水中相应的超声波长)的宽带平面换能器辐射的脉冲压力场。接收机采用线性孔径25 μm厚PVDF膜水听器。研究表明,重构信号的质量在很大程度上取决于信噪比、孔径尺寸和离源距离。对于长度为L = 2.6 mm≈3.9c,轴向为z = 3 mm的孔径,在信噪比分别为60、40和20 dB的情况下,重构压力与原始压力rpp - d的相关系数分别为0.999、0.988和0.655。当孔径较大(L = 4.6=mm≈6.9c),信噪比为40 dB时,在此距离下无法获得满意的结果(rpp = 0.912)。当轴向距离较大(z = 20 mm)时,反褶积效果较好(rpp = 0.928)。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
求助全文
约1分钟内获得全文 求助全文
来源期刊
自引率
0.00%
发文量
0
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整,为了账户安全,请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
确定
请完成安全验证×
copy
已复制链接
快去分享给好友吧!
我知道了
右上角分享
点击右上角分享
0
联系我们:info@booksci.cn Book学术提供免费学术资源搜索服务,方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号:604180095
Book学术官方微信