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Proceedings Paper

Optical fiber array surface roughness sensor
Author(s): Sarit Pal; S. K. Kak
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Paper Abstract

This paper discusses the technique of sensing the roughness of a surface in terms of slope of its microelements, based on reflection and scattering of electromagnetic wave from such elements of the continuous surface. An array of fibers collects the optical power reflected from the surface due to illuminating optical energy launched onto it through the central fiber of the array. The tilt and orientation of the illuminated pixel can be estimated from the measurement of reflected and scattered power captured by different fibers in the array. Theoretical developments to compute the tilt and orientation of the illuminated area -- by the shape of the illuminated spot of the incident beam, analyzing the reflected or scattered beam, and the reflected beam intensity available at different fibers of the array -- is presented. The intensity profile so derived shows close agreement to that obtained experimentally. A number of different types of array packing structures have been suggested and analyzed to evaluate their comparative efficiencies. The results obtained demonstrate that such a sensor can be used to measure surface roughness over a wide range, by employing different etching techniques like analyzing total integrated scattering (TIS), angle resolved light scattering (ARLS), specular reflection, etc.

Paper Details

Date Published: 28 April 1999
PDF: 6 pages
Proc. SPIE 3666, International Conference on Fiber Optics and Photonics: Selected Papers from Photonics India '98, (28 April 1999); doi: 10.1117/12.347971
Show Author Affiliations
Sarit Pal, Banaras Hindu Univ. (India)
S. K. Kak, Banaras Hindu Univ. (India)

Published in SPIE Proceedings Vol. 3666:
International Conference on Fiber Optics and Photonics: Selected Papers from Photonics India '98
Anurag Sharma; Banshi Dhar Gupta; Ajoy K. Ghatak, Editor(s)

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