Displacement measurements over a square meter area using digital holographic interferometry

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 wit...

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Bibliographic Details
Published in:Optical engineering 2014-09, Vol.53 (9), p.092009-092009
Main Authors: De la Torre Ibarra, Manuel H, Flores Moreno, J. Mauricio, Aguayo, Daniel D, Hernández-Montes, María del Socorro, Pérez-López, Carlos, Mendoza-Santoyo, Fernando
Format: Article
Language:English
Subjects:
Digital
Displacement
Illumination
Interferometers
Lasers
Meters
Stabilization
Vibration
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Summary: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.
ISSN:0091-3286
1560-2303
DOI:10.1117/1.OE.53.9.092009