Laboratoire de Mécanique et d'Acoustique, CNRS, UPR 7051, Aix-Marseille Université, Centrale Marseille, F-13402 Marseille Cedex 20, France.
J Acoust Soc Am. 2013 Aug;134(2):1001-10. doi: 10.1121/1.4812778.
This study deals with the reconstruction, from ultrasonic measured data, of the sound speed profile of a penetrable two-dimensional target of arbitrary cross-section embedded in an infinite medium. Green's theorem is used to obtain a domain integral representation of the acoustical scattered field, and a discrete formulation of the inverse problem is obtained using a moment method. An iterative non-linear algorithm minimizing the discrepancy between the measured and computed scattered fields is used to reconstruct the sound speed profile in the region of interest. The minimization process is performed using a conjugated-gradient method. An experimental study with significant acoustical impedance contrast targets immersed in water was performed. Images of the sound speed profile obtained by inversion of experimental data are presented.
本研究致力于从超声测量数据中重建嵌入无限介质中的任意横截面可穿透二维目标的声速剖面。格林定理用于获得声学散射场的域积分表示，并使用矩量法获得逆问题的离散形式。使用最小化测量和计算散射场之间差异的迭代非线性算法来重建感兴趣区域中的声速剖面。最小化过程使用共轭梯度法进行。在水中浸泡有显著声阻抗对比目标的实验研究已经完成。通过对实验数据进行反演得到的声速剖面图像被呈现。
