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Proceedings Paper

Determining the optimum image recording conditions in shearography based on spatial frequency considerations
Author(s): Fook Siong Chau; Tuck Wah Ng
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Paper 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.

Paper Details

Date Published: 28 May 1993
PDF: 12 pages
Proc. SPIE 1821, Industrial Applications of Optical Inspection, Metrology, and Sensing, (28 May 1993); doi: 10.1117/12.145543
Show Author Affiliations
Fook Siong Chau, National Univ. of Singapore (Singapore)
Tuck Wah Ng, National Univ. of Singapore (Singapore)


Published in SPIE Proceedings Vol. 1821:
Industrial Applications of Optical Inspection, Metrology, and Sensing
Gordon M. Brown; Kevin G. Harding; H. Philip Stahl, Editor(s)

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