Optical fiber array surface roughness sensor

Sarit Pal; S. K. Kak

doi:10.1117/12.347971

28 April 1999 Optical fiber array surface roughness sensor

Sarit Pal, S. K. Kak

Proceedings Volume 3666, International Conference on Fiber Optics and Photonics: Selected Papers from Photonics India '98; (1999) https://doi.org/10.1117/12.347971
Event: International Conference on Fiber Optics and Photonics: Selected Papers from Photonics India '98, 1998, New Delhi, India

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.

Citation Download Citation

Sarit Pal and S. K. Kak "Optical fiber array surface roughness sensor", Proc. SPIE 3666, International Conference on Fiber Optics and Photonics: Selected Papers from Photonics India '98, (28 April 1999); https://doi.org/10.1117/12.347971

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KEYWORDS

Sensors

Surface roughness

Beam shaping

Optical arrays

Optical fibers

Light scattering

Scattering

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