Optimization of fringe spacing in a digital flatness test

The optimum condition of fringe spacing in a flatness test using digital fringe analysis is described. This condition is based on information theory and maximizes the amount of measurement information in a fringe image. First, the relationship between resolution and data sampling number is discussed...

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Bibliographic Details
Published in:Applied optics (2004) 1985-08, Vol.24 (15), p.2456-2459
Main Author: Hatsuzawa, T
Format: Article
Language:English
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Summary:The optimum condition of fringe spacing in a flatness test using digital fringe analysis is described. This condition is based on information theory and maximizes the amount of measurement information in a fringe image. First, the relationship between resolution and data sampling number is discussed. Then the optimum fringe spacing is derived using the concept of average information--entropy. Numerical analysis to evaluate fringe spacing in FFT fringe analysis is performed using the derived condition. An experiment is carried out with a liquid level flatness tester and its results show high space frequency resolution superiority at the condition.
ISSN:1559-128X
DOI:10.1364/AO.24.002456