Plateaus in thermogram indicates
Answers
Explanation:
Four decades of continuous research to improve the detection and the characterization of defects have made stimulated thermography, especially pulse thermography (PT), one of the most sophisticated and versatile thermal non-destructive evaluation (NDE) techniques [1,2]. The thermographic signal reconstruction (TSR) data processing technique is the most recent improvement which raises thermography to the level of the most established NDE techniques (ultrasonics, X-rays, liquid penetrant, magnetic particles and eddy currents). These developments, both on the thermographic equipments themselves and on the advanced data processing techniques, could have an impact not only in the NDE field, but also in biomedicine. Although the “structures” observed in NDE remain less complex than those studied in the biomedical field, the progress made in NDE may indeed be useful for this field too.
Thus, the aim of this review paper is to illustrate the applicability of TSR to biomedicine and to point out the spectacular enhancements of the thermographic images obtained in this domain. Consequently, the paper does not claim to provide new and unpublished results to the reader, but it does propose a relevant selection of examples, based on recent pioneering works taken from three research fields, associated with structures of increasing complexity:
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NDE field: inspection of a laminate composite coupon;
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experimental mechanics field: in situ damage monitoring of woven composite samples under tensile loading;
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biomedical field: visualization of blood circulation in the forearm.