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It is known that methods of thermographic non destructive testing (TNDT) based on thermal contrast are strongly affected by non-uniform heating at the surface. Hence, the results obtained from these methods considerably depend on the chosen reference point. The differential absolute contrast (DAC) method was developed to eliminate the need of determining a reference point that defines the thermal contrast with respect to an ideal (sound) area. Although DAC is very useful at early times, the DAC accuracy decreases at later times when the heat front approaches the sample rear face. In this article, a new DAC version is proposed by explicitly introducing the sample thickness and using the thermal quadrupoles theory. It is shown that the validity of the new DAC version increases for long times while being preserved at short times.

Hernán D. Benítez

grupo de investigacion de percepcion y sistemas inteligentes escuela de ingeniera electrica y electronica,universidad del valle cali colombia

Clemente Ibarra Castanedo

computer vision and sistems laboratory,departament of electrical engineering universite laval,quebec,canada

Abdelhakim Bendada

computer vision and sistems laboratory,departament of electrical engineering universite laval,quebec,canada

Xavier Maldague

computer vision and sistems laboratory,departament of electrical engineering universite laval,quebec,canada

Humberto Loaiza

grupo de investigacion de percepcion y sistemas inteligentes escuela de ingeniera electrica y electronica,universidad del valle cali colombia

Eduardo Caicedo

grupo de investigacion de percepcion y sistemas inteligentes escuela de ingeniera electrica y electronica,universidad del valle cali colombia
1.
Benítez HD, Ibarra Castanedo C, Bendada A, Maldague X, Loaiza H, Caicedo E. a new thermal contrast for non-destructive thermographic testing of materials. inycomp [Internet]. 2007 Jan. 8 [cited 2024 Nov. 5];9(1):31-44. Available from: https://revistaingenieria.univalle.edu.co/index.php/ingenieria_y_competitividad/article/view/2493