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8 March 2004 Self-calibrated fiber optic transflection probe for NO2 detection
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Proceedings Volume 5272, Industrial and Highway Sensors Technology; (2004)
Event: Optical Technologies for Industrial, Environmental, and Biological Sensing, 2003, Providence, RI, United States
The paper describes an optical fiber based sensor (FOS) for the detection of the pollutant gas, NO2, in a mixture of gases. The design comprises of a fiber optic transflection probe with a sensor element placed at one end. In the present FOS, the transducing component is prepared by sol-gel process. An equal quantity of a diazotizing reagent together with a coupling reagent is immobilized in the sol-gel matrix, which forms an azo dye in the presence of NO2. The sensor relies on the coloration reaction occurring at the micropores of this sol-gel film in the NO2 environment and offers a consequent variation in the optical absorption at a specific wavelength. The current sensor design gives more than 85% of variation in the output intensity at a NO2 concentration of few parts per million in air sample.
© (2004) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Shelly John Mechery and Jagdish P. Singh "Self-calibrated fiber optic transflection probe for NO2 detection", Proc. SPIE 5272, Industrial and Highway Sensors Technology, (8 March 2004);

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