This study formally adapts the time-domain linear sampling method (TLSM) for ultrasonic imaging of stationary and evolving fractures in safety-critical components. The TLSM indicator is then applied to the laboratory test data of [22, 18] and the obtained reconstructions are compared to their frequency-domain counterparts. The results highlight the unique capability of the time-domain imaging functional for high-fidelity tracking of evolving damage, and its relative robustness to sparse and reduced aperture data at moderate noise levels. A comparative analysis of the TLSM images against the multifrequency LSM maps of [22] further reveals that thanks to the full-waveform inversion in time and space, the TLSM generates images of remarkably higher quality with the same dataset.
翻译:本研究正式调整了用于静止和演变中安全关键部件骨折的超声波成像的时空线性取样法(TLSM),然后将TLSM指标应用于[22、18]的实验室测试数据,并将所获取的重建数据与其频率域对等数据进行比较,结果突出显示了对不断演变的损害进行高度不端跟踪的时间域成像功能的独特能力,以及相对于中等噪音水平的稀有和减少的孔径数据的强性。根据[22]多频LSM地图对TLSM图像进行的比较分析进一步显示,由于时间和空间的全波变换,TLSM在同一个数据集中生成质量极高的图像。