Fringe compensation in multiband speckle shearography using a wedge prism

Details Fringe compensation in multiband speckle shearography using a wedge prism Fringe compensation in multiband speckle shearography using a wedge prism

May 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003spie.4933...82f&link_type=abstract

Speckle Metrology 2003. Edited by Gastinger, Kay; Lokberg, Ole J.; Winther, Svein. Proceedings of the SPIE, Volume 4933, pp. 8

Computer Science

Scientific paper

Using a multiband light source in Speckle Shearography makes dispersion effects become an issue. Since the fringe pattern of a shearographic measurement depends on the wavelength, the fringe modulation decreases if a light source with a very broad band is used. Therefore, in this paper we propose to make the fringe distance of the resulting shearogram independent of the wavelength using a dispersive optical component. To demonstrate this method, a shearing interferometer is presented, which creates a shear that is proportional to the wavelength. Provided that the object deformation along the shear is linear to the first order, the wavelength dependent shear is obtained by inserting a wedge prism into a Michelson Interferometer with the object in the input plane and the detector array in the output plane. An important prerequisite to this technique is that the refractive index of the wedge prism has a linear characteristic within the observed spectral range. Since the experimental investigations were performed with a mercury arc lamp, nBK7 is shown to be a suitable material within the range of 435 nm to 546 nm.

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