Referencing systems for evanescent wave sensors

George Stewart; Douglas F. Clark; Brian Culshaw; Ivan Andonovic

doi:10.1117/12.21987

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1 September 1990 Referencing systems for evanescent wave sensors

George Stewart, Douglas F. Clark, Brian Culshaw, Ivan Andonovic

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Proceedings Volume 1314, Fibre Optics '90; (1990) https://doi.org/10.1117/12.21987
Event: Fibre Optics '90, 1990, London, United Kingdom

Abstract

The use of optical waveguides as chemical sensors requires a referencing system to compensate for the effect of contamination on the surface of the sensor. In this paper, we propose the use of two waves with different penetration depths for their evanescent fields in order to correct measurements. Several schemes are considered, including two-wavelength, two-mode and polarisation discrimination techniques. It is shown that good results can be obtained using TE₀ and TM₀ modes in a high index film.

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George Stewart, Douglas F. Clark, Brian Culshaw, and Ivan Andonovic "Referencing systems for evanescent wave sensors", Proc. SPIE 1314, Fibre Optics '90, (1 September 1990); https://doi.org/10.1117/12.21987

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