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Proceedings Paper

Active intrinsic optical chemical sensor for the detection and measurement of carbon monoxide in air
Author(s): Steven J. Syracuse; Douglas J. Ferrell; Edgar A. Mendoza; Albert N. Khalil; Edward M. Schmidlin; Robert A. Lieberman
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Paper Abstract

In our ongoing work developing a reversible optical chemical sensor (OCS) for CO, we have produced a greatly simplified and improved sensor design. Chemically impregnated porous optical fiber has been replaced with impregnated porous Vycor glass; a battery powered blue LED has replaced a compact Hg lamp and power supply; optical fibers are no longer necessary; The Vycor acts as both chemical transducer and optical waveguide. The CO OCS now consists of five components: a 9 V battery and a blue LED; a transition metal impregnated porous Vycor matrix/waveguide; a short pass interference filter or a colloidally colored glass bandpass filter; and a large area, resin coated Si photodetector. The CO OCS responds reversibly to the presence of [CO] in both air and in N2, over the 40 to 950 ppm range at STP. The sensor has shown a lower limit of detection of approximately 40 ppm at STP. In terms of the transmitted intensity, the sensor is very slow in responding to very slow changes or buildups in the [CO]ambient. Yet, in the presence of rapid changes in the [CO]ambient, the sensor displays a 100% time constant of 60 to 70 seconds irrespective of the delta [CO]ambient. The new design simplifies sensing greatly in that optical fibers (and the various problems associated with their use), bulky light sources, and extremely fragile porous optical fibers have been supplanted by small, durable, inexpensive, commercially available components. The sensor could find application in environments in which the [CO] can or does change rapidly.

Paper Details

Date Published: 21 October 1994
PDF: 12 pages
Proc. SPIE 2293, Chemical, Biochemical, and Environmental Fiber Sensors VI, (21 October 1994); doi: 10.1117/12.190968
Show Author Affiliations
Steven J. Syracuse, Physical Optics Corp. (United States)
Douglas J. Ferrell, Physical Optics Corp. (United States)
Edgar A. Mendoza, Physical Optics Corp. (United States)
Albert N. Khalil, Physical Optics Corp. (United States)
Edward M. Schmidlin, Physical Optics Corp. (United States)
Robert A. Lieberman, Physical Optics Corp. (United States)

Published in SPIE Proceedings Vol. 2293:
Chemical, Biochemical, and Environmental Fiber Sensors VI
Robert A. Lieberman, Editor(s)

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