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15 October 2012 Homogeneity measurements of hardness standards with a nondestructive optical method
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Inhomogeneity measurement is an important test of reference materials. In case of hardness reference blocks it consists of measurements at five distributed points on the surface with a test indenter. Unfortunately the test is destructive and it is not possible to use the same point for a new measurement. In this work we propose an optical method to measure the inhomogeneity of hardness standards. As we reported in a recent work, variations of hardness in a steel produces variations in their optical properties, this fact can be used to detect variations in the hardness of blocks with a non-destructive method.
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Jose G. Suarez-Romero, Eduardo Hernandez-Gomez, and Juan B. Hurtado-Ramos "Homogeneity measurements of hardness standards with a nondestructive optical method", Proc. SPIE 8495, Reflection, Scattering, and Diffraction from Surfaces III, 849517 (15 October 2012);

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