13 May 2014 Displacement measurements over a square meter area using digital holographic interferometry
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Current industrial demand for optical nondestructive testing includes the displacement analysis of large object areas. This paper reports on the use of a digital holographic interferometer to measure displacements over an area of 1.14  m2 . The object under study is a framed working table covered with a Formica layer fixed to a granite bench, and it is observed and illuminated employing a high speed and high resolution camera and a continuous wave high output power laser, respectively. A stabilization procedure needs to be established as long illumination distances are required in order to retrieve the entire surface optical phase during a series of continuous deformations. As a proof of principle, two different tests are presented: the first involves a slow continuous loading process and the second a vibration condition. The wrapped phase and displacement maps are both displayed.
© 2014 Society of Photo-Optical Instrumentation Engineers (SPIE)
Manuel H. De la Torre Ibarra, Manuel H. De la Torre Ibarra, J. Mauricio Flores Moreno, J. Mauricio Flores Moreno, Daniel D. Aguayo, Daniel D. Aguayo, María del Socorro Hernández-Montes, María del Socorro Hernández-Montes, Carlos Pérez-López, Carlos Pérez-López, Fernando Mendoza-Santoyo, Fernando Mendoza-Santoyo, } "Displacement measurements over a square meter area using digital holographic interferometry," Optical Engineering 53(9), 092009 (13 May 2014). https://doi.org/10.1117/1.OE.53.9.092009 . Submission:

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