Digital processing of speckle photography to measure refractive index of a transparent plate

Nasser A. Moustafa

doi:10.1117/12.2020374

24 May 2013 Digital processing of speckle photography to measure refractive index of a transparent plate

Nasser A. Moustafa

Proceedings Volume 8791, Videometrics, Range Imaging, and Applications XII; and Automated Visual Inspection; 87911P (2013) https://doi.org/10.1117/12.2020374
Event: SPIE Optical Metrology 2013, 2013, Munich, Germany

Abstract

In this paper, an accurate and efficient method for measuring the refractive index of a transparent plate is developed. The refractive index is evaluated by using Fourier Transform Method (FTM), from a fringe pattern generated by digital speckle photography. The validity and accuracy of the method were confirmed with a standard reference material. Furthermore, the method is insensitive to environmental perturbations, and simple to implement, compared to the conventional index measurement methods providing similar accuracy.

Citation Download Citation

Nasser A. Moustafa "Digital processing of speckle photography to measure refractive index of a transparent plate", Proc. SPIE 8791, Videometrics, Range Imaging, and Applications XII; and Automated Visual Inspection, 87911P (24 May 2013); https://doi.org/10.1117/12.2020374

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KEYWORDS

Refractive index

Speckle

Photography

Fourier transforms

Glasses

Calibration

Fringe analysis

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