Lock-in-shearography for the detection of transport-induced damages on artwork
Lock-in-shearography for the detection of transport-induced damages on artwork
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DOI：
10.1117/12.2270278
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发表时间：
2017-07
期刊：
影响因子：
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通讯作者：
D. Buchta;C. Heinemann;G. Pedrini;C. Krekel;W. Osten
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文献类型：
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作者：
D. Buchta;C. Heinemann;G. Pedrini;C. Krekel;W. Osten
数字剪切散斑技术是一种成熟的复合结构无损检测技术。此外，艺术品缺陷检测的应用也得到了成功证明。虽然一般来说，物平面中的缺陷定位效果很好，但无法获得深度信息。为了克服这个问题，与热成像类似，锁定技术可以应用于剪切散斑成像。由于调制频率不同，可以控制热波的穿透深度。这使得能够确定深度信息。在本文中，我们研究了锁定技术在艺术品无损检测中的潜力。因此，我们对具有不同缺陷深度的木板进行模拟。我们描述基本概念并将结果与锁定热成像进行比较。最后，我们表明盲频率适用于锁定剪切成像中的定量深度信息，并讨论了需要克服的限制。
Digital shearography is a well-established technique for non-destructive testing of composite structures. Furthermore the application for defect detection on artwork could also be successfully proven. While in general the location of a defect in the object plane works very well, no depth information is obtained. To overcome this issue, similar to thermography, the lock-in-technique can be applied to shearography. Due to different modulation frequencies the penetration depth of the thermal wave can be controlled. This enables the determination of depth information. In this paper we investigate the potential of the lock-in-technique for the use in non-destructive testing of artwork. Therefore we do simulations on a wooden panel with different defect-depth. We describe the basic concept and compare the results with lock-in thermography. Finally, we show that the blind-frequency is suitable for quantitative depth information in lock-inshearography and discuss limits, to be overcome.