Abstract
Digital shearography based on Mach–Zehnder interferometer suffers from the disadvantage of a small angle of view due to the structure. A novel digital shearography set-up with a large angle of view, which is based on the combination of new CCD technology, a semiconductor laser, a Mach–Zehnder shear interferometer and a 4f system, is demonstrated. Independent control of the shear and the frequency of the spatial carrier can be attained with this set-up. In the optical arrangement, the imaging lens is placed in front of the Mach–Zehnder interferometer instead of behind it as in the traditional digital shearography. So the angle of view is no longer limited by the Mach–Zehnder interferometer. Phase extraction is obtained by both advanced sinusoidal-fitting method and Fourier transform method, which are applied to interference patterns with a spatial carrier in the primary fringes. The experimental implementation of the set-up and the results obtained with it are presented and discussed.
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