实验室目标的稀疏源走时层析成像：异常检测的准确性和鲁棒性
Sparse source travel-time tomography of a laboratory target: accuracy and robustness of anomaly detection
摘要：
这项研究涉及锥束走时层析成像。重点是信号源的稀疏分布，这在具有挑战性的现场环境中可能是必要的，例如在小行星断层扫描中。目标是近似屈光异常的鲁棒检测所需的最小数量的源位置，例如，小行星内的空洞或混凝土中的铸件缺陷。实验超声波数据记录利用作为目标的150毫米的塑料铸造立方体含有三个石头直径在22和41毫米之间。使用的信号频率为55千赫（35毫米波长）。从1到6的源计数被测试用于不同的放置。基于我们的统计反演方法和分析的结果，三个或四个源被发现，导致可靠的反演。所调查的源配置也根据其性能进行了排名。例如，我们的结果可以用于行星任务的规划以及材料测试。
英文摘要：
This study concerned conebeam travel-time tomography. The focus was on a sparse distribution of signal sources that can be necessary in a challenging in situ environment such as in asteroid tomography. The goal was to approximate the minimum number of source positions needed for robust detection of refractive anomalies, e.g., voids within an asteroid or a casting defects in concrete. Experimental ultrasonic data were recorded utilizing as a target a 150 mm plastic cast cube containing three stones with diameter between 22 and 41 mm. A signal frequency of 55 kHz (35 mm wavelength) was used. Source counts from one to six were tested for different placements. Based on our statistical inversion approach and analysis of the results, three or four sources were found to lead to reliable inversion. The source configurations investigated were also ranked according to their performance. Our results can be used, for example, in the planning of planetary missions as well as in material testing.
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