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Proceedings Paper

Design considerations for infrared fiber optic sensors
Author(s): Jeffrey W. Griffin; Norman C. Anheier; Robert E. Osantowski; Charlene A. Matlock; Khris B. Olsen
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Paper Abstract

This presentation focuses on mechanical and electro-optical design considerations embodied in VOtectTM -- an infrared fiber optic sensor for volatile organic compounds. Presently, the VOtectTM system is configured for remote detection of hydrocarbon vapors associated with gasoline and other internal-combustion fuels. Using commercially available zirconate glass optical fibers, the sensor exploits the overlap of absorption spectra due to carbon-hydrogen stretching vibrations between 3.3 and 3.6 microns, with the optical output of an infrared HeNe laser operating at 3.39 microns. Compensation for position-dependent fiber bending losses is achieved using 1.15-micron radiation simultaneously emitted by the laser source. Initial laboratory evaluations of the VOtectTM system indicates detection sensitivities well below the lower explosion limits for petroleum distillates, indicating the usefulness of the sensor for petrochemical safety applications. The sensor is intrinsically safe (e.g., explosion-proof), since no electrical power is required at the probe tip. Preliminary sensor optical power budget calculations indicate that the zirconate fiber optic umbilical, which connects the sensor probe to the electro-optical detection system, can be as long as several hundred meters. Calibration data for a variety of hydrocarbons indicate linear relationships between ln(V/Vo) and vapor concentration, suggesting that the sensor should prove useful for on-line, real-time process control applications.

Paper Details

Date Published: 10 March 1994
PDF: 16 pages
Proc. SPIE 2068, Chemical, Biochemical, and Environmental Fiber Sensors V, (10 March 1994); doi: 10.1117/12.170671
Show Author Affiliations
Jeffrey W. Griffin, Battelle Pacific Northwest Lab. (United States)
Norman C. Anheier, Battelle Pacific Northwest Lab. (United States)
Robert E. Osantowski, Battelle Pacific Northwest Lab. (United States)
Charlene A. Matlock, Battelle Pacific Northwest Lab. (United States)
Khris B. Olsen, Battelle Pacific Northwest Lab. (United States)


Published in SPIE Proceedings Vol. 2068:
Chemical, Biochemical, and Environmental Fiber Sensors V
Robert A. Lieberman, Editor(s)

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