13 May 2014 Displacement measurements over a square meter area using digital holographic interferometry
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Optical Engineering, 53(9), 092009 (2014). doi:10.1117/1.OE.53.9.092009
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, J. Mauricio Flores Moreno, Daniel D. Aguayo, María del Socorro Hernández-Montes, Carlos Pérez-López, 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

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