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Optical Engineering

Optical sensor based on coated light guides
Author(s): Anatoly Babchenko; Josef S. Bodenheimer; Meir Nitzan
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Paper Abstract

A new type of intensity-modulated sensors based on a coated light guide is presented. These sensors operate preferentially in the regime of total internal reflection (TIR), rather than relying on violation of TIR as in conventional intensity-modulated sensors. Using a physical model of the new sensor structure, the output light intensity is computed as a function of the complex reflection and transmission coefficients at the substrate-film and film-ambient interfaces. Based on the theoretical results, an experimental setup has been constructed and evaluated for measurements on various liquids. The results confirm the predicted dependence of the output signal on the characteristics of the substrate-film-ambient system. Of particular importance is the novel feature that the output signal increases as the refractive index of the ambient medium increases, at certain incidence angles.

Paper Details

Date Published: 1 December 1995
PDF: 6 pages
Opt. Eng. 34(12) doi: 10.1117/12.215506
Published in: Optical Engineering Volume 34, Issue 12
Show Author Affiliations
Anatoly Babchenko, Jerusalem College of Technology (Israel)
Josef S. Bodenheimer, Jerusalem College of Technology (Israel)
Meir Nitzan, Jerusalem College of Technology (Israel)

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