28 May 1993 Determining the optimum image recording conditions in shearography based on spatial frequency considerations
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Proceedings Volume 1821, Industrial Applications of Optical Inspection, Metrology, and Sensing; (1993); doi: 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.
© (1993) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Fook Siong Chau, 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); doi: 10.1117/12.145543; https://doi.org/10.1117/12.145543
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KEYWORDS
Spatial filters

Spatial frequencies

Visibility

Image acquisition

Shearography

Image filtering

Photography

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