pH sensor based on a dielectric optical waveguide

Jialing Yao; Daniel McStay; Peter J. Quinn; Alan J. Rogers

doi:10.1117/12.170684

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10 March 1994 pH sensor based on a dielectric optical waveguide

Jialing Yao, Daniel McStay, Peter J. Quinn, Alan J. Rogers

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Proceedings Volume 2068, Chemical, Biochemical, and Environmental Fiber Sensors V; (1994) https://doi.org/10.1117/12.170684
Event: Optical Tools for Manufacturing and Advanced Automation, 1993, Boston, MA, United States

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.

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Jialing Yao, Daniel McStay, Peter J. Quinn, and Alan J. Rogers "pH sensor based on a dielectric optical waveguide", Proc. SPIE 2068, Chemical, Biochemical, and Environmental Fiber Sensors V, (10 March 1994); https://doi.org/10.1117/12.170684

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