Imaging algorithms for locating damage via in situ ultrasonic sensors
Imaging algorithms for locating damage via in situ ultrasonic sensors
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DOI：
10.1109/sas13374.2008.4472945
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发表时间：
2008-03
期刊：
影响因子：
--
通讯作者：
J. Michaels;A. Croxford;P. Wilcox
中科院分区：
文献类型：
--
作者：
J. Michaels;A. Croxford;P. Wilcox
永久安装的超声波传感器安排作为一个空间分布的阵列被认为是在现场监测的结构部件的完整性。在这里，我们考虑两种成像算法定位损伤的基础上接收到的信号的变化。考虑阵列中的所有换能器对，每个换能器依次充当发射器，其余换能器充当接收器。第一成像算法基于根据离散散射体的预期到达时间在每个换能器对之间空间分布差分信号。由同心椭圆组成的结果图像在所有对上求和以形成最终图像。第二种算法是基于源自同一发射器并由两个不同换能器接收的波形之间的互相关。捕获两对之间的到达时间差的互相关波形被类似地分布并求和以经由双曲线而不是椭圆关系形成最终图像。结果显示为在铝板中的人工损伤。
Permanently mounted ultrasonic sensors arranged as a spatially distributed array are being considered for in situ monitoring of the integrity of structural components. Here we consider two imaging algorithms for locating damage based upon changes in received signals. All transducer pairs in the array are considered, with each transducer acting in turn as a transmitter and the remaining transducers as receivers. The first imaging algorithm is based upon spatially distributing the differenced signals between each transducer pair as per expected arrival times for discrete scatterers. The resulting images, which consist of concentric ellipses, are summed over all pairs to form the final image. The second algorithm is based upon the cross correlation between waveforms originating from the same transmitter and received by two different transducers. The cross correlation waveforms, which capture the time difference of arrival between two pairs, are similarly distributed and summed to form the final image via a hyperbolic rather than an elliptical relationship. Results are shown for artificial damage in an aluminum plate.