Self-calibrated fiber optic transflection probe for NO2 detection

Shelly John Mechery; Jagdish P. Singh

doi:10.1117/12.516204

8 March 2004 Self-calibrated fiber optic transflection probe for NO₂ detection

Proceedings Volume 5272, Industrial and Highway Sensors Technology; (2004) https://doi.org/10.1117/12.516204
Event: Optical Technologies for Industrial, Environmental, and Biological Sensing, 2003, Providence, RI, United States

Abstract

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.

Citation Download Citation

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); https://doi.org/10.1117/12.516204

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