Determining the optimum image recording conditions in shearography based on spatial frequency considerations

Fook Siong Chau; Tuck Wah Ng

doi:10.1117/12.145543

28 May 1993 Determining the optimum image recording conditions in shearography based on spatial frequency considerations

Fook Siong Chau, Tuck Wah Ng

Author Affiliations +

Proceedings Volume 1821, Industrial Applications of Optical Inspection, Metrology, and Sensing; (1993) https://doi.org/10.1117/12.145543
Event: Applications in Optical Science and Engineering, 1992, Boston, MA, United States

Abstract

The transmission function of a double-exposure shearing specklegram consists of fringe- bearing and non-fringe bearing components. To obtain interference fringes, spatial filtering is performed on the processed specklegram to allow only the fringe-bearing components to pass. The spatial frequency for filtering is often determined on a trial-and-error basis. In this paper, a technique is presented to obtain a spectral distribution from which the optimum spatial filtering frequency can be deduced. Knowledge of the optimum spatial filtering frequency to recording aperture relationship enables better selection of image recording conditions.

Citation Download Citation

Fook Siong Chau and Tuck Wah Ng "Determining the optimum image recording conditions in shearography based on spatial frequency considerations", Proc. SPIE 1821, Industrial Applications of Optical Inspection, Metrology, and Sensing, (28 May 1993); https://doi.org/10.1117/12.145543

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