11 July 2017 Lock-in-shearography for the detection of transport-induced damages on artwork
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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.
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D. Buchta, D. Buchta, C. Heinemann, C. Heinemann, G. Pedrini, G. Pedrini, C. Krekel, C. Krekel, W. Osten, W. Osten, } "Lock-in-shearography for the detection of transport-induced damages on artwork", Proc. SPIE 10331, Optics for Arts, Architecture, and Archaeology VI, 103310G (11 July 2017); doi: 10.1117/12.2270278; https://doi.org/10.1117/12.2270278

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