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Proceedings Paper

pH sensor based on a dielectric optical waveguide
Author(s): Jialing Yao; Daniel McStay; Peter J. Quinn; Alan J. Rogers
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Paper Abstract

This paper describes a remotely controlled, in-situ pH sensor by measuring the absorption change of an optical waveguide loaded with benzopurpurin 4B solutions. The theoretical evaluation is given for the sensitivity of TE and TM mode. The advantages of this sensor are as follows: (1) a liquid flow indicator avoids any irreversible effects; (2) waveguides generate a uniform evanescent field to provide a long stable reaction length. The TE mode shows better sensitivity than that of the TM mode for this sensor. It has a sensitivity of +/- 0.01 pH and a dynamic range of pH value 2.38 to 6.28.

Paper Details

Date Published: 10 March 1994
PDF: 8 pages
Proc. SPIE 2068, Chemical, Biochemical, and Environmental Fiber Sensors V, (10 March 1994); doi: 10.1117/12.170684
Show Author Affiliations
Jialing Yao, King's College London (United Kingdom)
Daniel McStay, Robert Gordon Univ. (United Kingdom)
Peter J. Quinn, King's College London (United Kingdom)
Alan J. Rogers, King's College London (United Kingdom)


Published in SPIE Proceedings Vol. 2068:
Chemical, Biochemical, and Environmental Fiber Sensors V
Robert A. Lieberman, Editor(s)

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