The use of digital holographic interferometry for 3D measurements using simultaneously three illumination directions was demonstrated by Saucedo et al. (Optics Express 14(4) 2006). The technique records two consecutive images where each one contains three holograms in it, e.g., one before the deformation and one after the deformation. A short coherence length laser must be used to obtain the simultaneous 3D information from the same laser source. In this manuscript we present an extension of this technique now illuminating simultaneously with three different lasers at 458, 532 and 633 nm, and using only one high resolution monochrome CMOS sensor. This new configuration gives the opportunity to use long coherence length lasers allowing the measurement of large object areas. A series of digital holographic interferograms are recorded and the information corresponding to each laser is isolated in the Fourier spectral domain where the corresponding phase difference is calculated. Experimental results render the orthogonal displacement components u, v and w during a simple load deformation.
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Carlos Pérez-López, Manuel H. De la Torre-Ibarra, and Fernando Mendoza Santoyo
Opt. Express 14(21) 9709-9715 (2006)
Patrice Tankam, Pascal Picart, Denis Mounier, Jean Michel Desse, and Jun-chang Li
Appl. Opt. 49(3) 320-328 (2010)
Daniel D. Aguayo, Fernando Mendoza Santoyo, Manuel H. De la Torre-I, Manuel D. Salas-Araiza, Cristian Caloca-Mendez, and David Asael Gutierrez Hernandez
Opt. Express 18(6) 5661-5667 (2010)