19 April 2013 Simultaneous monitoring of electrical resistance and optical absorbance signals of a fiber optoelectrode for multiple gas sensing
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Abstract
An electrically conductive polyaniline (PANi) membrane has been coated on the end of an optical fiber to form a fiber optoelectrode for simultaneously monitoring electrical and optical responses of the polymer membrane exposed to gas samples. Two electrodes were glued on the side of the optical fiber for measuring the membrane’s electrical resistance. In the same time a light beam was delivered to the membrane coated on the end of the optical fiber by using an 1x2 optical fiber coupler. The light reflected back from the PANi membrane to the optical fiber coupler was delivered with the second arm of the optical fiber coupler to an optical fiber compatible spectrometer. The responses of the fiber optoelectrode to trace ammonia and water vapor in air samples have been investigated. It was found that the electrical resistance of the fiber optoelectrode changes when exposed to ammonia or water vapor. However, the fiber optoelectrode showed optical spectrometric response to trace ammonia in air, but did not show optical spectrometric response to water vapor in air in the tested concentration range (relative humidity from <1% to 83%). The nature of electrical and optical spectrometric responses of this fiber optoelectrode gives an opportunity to design a sensor to simultaneously monitor both trace ammonia and relative humidity in air.
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Shaui Shao, Shaui Shao, Yu Hung, Yu Hung, Shiquan Tao, Shiquan Tao, } "Simultaneous monitoring of electrical resistance and optical absorbance signals of a fiber optoelectrode for multiple gas sensing", Proc. SPIE 8692, Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2013, 869206 (19 April 2013); doi: 10.1117/12.2009744; https://doi.org/10.1117/12.2009744
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