论文标题
时间 - 频率 - 域 - 域反向弹性散射：理论和实验
Time- vs. frequency- domain inverse elastic scattering: Theory and experiment
论文作者
论文摘要
这项研究正式适应了时间域线性采样方法（TLSM），以用于对安全 - 关键组件中固定和不断发展的裂缝的超声成像。然后将TLSM指标应用于[22，18]的实验室测试数据，并将获得的重建与其频域对应物进行比较。结果突出了时间域成像功能的独特功能，可实现不断发展的损害的高保真跟踪，以及其对中等噪声水平下稀疏和减少光圈数据的相对鲁棒性。对TLSM图像与[22]的多频LSM图的比较分析进一步表明，由于时空和空间的全波倒置，TLSM使用相同的数据集生成了质量较高的图像。
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.
