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7 November 2005 A distributed fiber optic chemical sensor for hydrogen cyanide detection
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A fiber optic hydrogen cyanide (HCN) sensor having its entire length as the sensing element is reported here. The optical fiber is multimode and consists of a pure fused-silica core and an HCN sensitive cladding. Upon exposure to HCN gas, the cladding rapidly changes color, resulting in attenuation of the fiber's light throughput. The fiber is used to detect HCN at part per million levels, which suggests that the propagating modes of light interact with the cladding. The sensitivity of the fiber as a function of sensor length and challenge concentration will be reported. Prior to exposure, the fiber attenuation measures less than 1 dB/m, making it possible to detect hydrogen cyanide on a continuous length of fiber on the scale of tens of meters. This technology could replace the need for having a collection of point-detectors to cover large areas, and hence lends itself to building and perimeter chemical detection.
© (2005) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Steven R. Cordero, Manal Beshay, Aaron Low, Harold Mukamal, David Ruiz, and Robert A. Lieberman "A distributed fiber optic chemical sensor for hydrogen cyanide detection", Proc. SPIE 5993, Advanced Environmental, Chemical, and Biological Sensing Technologies III, 599302 (7 November 2005);

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