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Proceedings Paper

Remote passive optically addressed and encoded sensor for gaseous pollutants
Author(s): Frank Kvasnik; Nicola J. Hortin; Luis E. Norena-Franco
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Paper Abstract

A passive optical chemical sensor is described that responds to interrogation by a pulsed near- IR optical transceiver over a line-of-sight path. The chemical detection method is based on changes in the near-IR optical transmittance of a dye film on a glass substrate that forms an integral part of the sensor. The response of the sensor to a chemical is encoded onto the signal returned to the transceiver using a re-entrant optical-fiber delay line. For each interrogating optical pulse, this sensor produces a characteristic sequence of return pulses from which the presence of a chemical can be determined. The uniquely identifiable response of the sensor can also be used to identify individual sensors. The sensor is capable of quantitative measurements, it is relatively insensitive to atmospheric conditions over the transmission path, and it has a high signal-to-noise ratio. The operation of the sensor with a semiconductor-based laser transceiver is demonstrated using reagents which exhibit near-IR optical changes in the presence of specific pollutants. This technique is readily adaptable for the sensing of a wide range of hazardous chemicals in both inaccessible and dangerous environments. Modified sensors can also be adopted for use in area protection applications.

Paper Details

Date Published: 10 February 1995
PDF: 7 pages
Proc. SPIE 2366, Optical Instrumentation for Gas Emissions Monitoring and Atmospheric Measurements, (10 February 1995); doi: 10.1117/12.205580
Show Author Affiliations
Frank Kvasnik, Univ. of Manchester (United Kingdom)
Nicola J. Hortin, Univ. of Manchester (United Kingdom)
Luis E. Norena-Franco, Univ. of Manchester (United Kingdom)


Published in SPIE Proceedings Vol. 2366:
Optical Instrumentation for Gas Emissions Monitoring and Atmospheric Measurements

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