Multiple-beam Fizeau fringe-pattern analysis using Fourier transform method for accurate measurement of fiber refractive index profile of polymer fiber

✍ Scribed by M. A. El-Morsy; T. Yatagai; A. Hamza; M. A. Mabrouk; T. Z. N. Sokkar

• Publisher: John Wiley and Sons
• Year: 2002
• Tongue: English
• Weight: 650 KB
• Volume: 85
• Category: Article
• ISSN: 0021-8995
• DOI: 10.1002/app.10387

✦ Synopsis

Abstract

In this article the Fourier transform method is applied to analyze multiple‐beam interference Fizeau fringes. The real part of the inverse Fourier transform is used to estimate a theoretical pattern. This pattern coincides with the experimental one. A derivative‐sign binary image of the interference pattern is also used in automated determination of the contour line of the fringe pattern, regardless of the quality of this pattern. A correlation between the pixel size and the accuracy of the measured fiber refractive index is presented. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 85: 475–484, 2002