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Appl Opt. 2005 Jan 1;44(1):27-31.

Detection of surface strain by three-dimensional digital holography.

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Centro de Investigaciones en Optica, Asociacion Civil, Loma del Bosque 115, León, Guanajuato CP 37150, Mexico.


Three-dimensional digital holography with three object-illuminating beams has been successfully used for the detection of surface strain in metallic objects. The optical setup that uses illuminating beams to irradiate the object from three directions means that all three object surface displacement components, x, y, and z, can be independently calculated and used to find the strain gradients on the surface. The results show the conversion of the complete surface displacement field into a surface strain field. The method is capable of measuring microstrains for out-of-plane surface displacements of less than 10 microm.


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