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Proceedings Paper

Remote fiber optic dosimeter for detecting hydrazine vapor
Author(s): Charles M. Klimcak; Gouri Radhakrishnan; B. Jaduszliwer
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Paper Abstract

A fiber optic chemical dosimeter has been developed for use in the remote detection of vapors of toxic amine rocket fuels (hydrazine and its substituted derivatives) that are used at U.S. Air Force and civilian launch sites. The dosimeter employs a colorimetric indicating reagent immobilized in a porous sol-gel cladding on multimode fiber. This reagent reacts selectively with the fuel vapor to produce a strongly absorbing cladding that introduces light propagation losses in the fiber; these losses indicate the presence of hydrazine (N2H4) vapor. The absorption occurs over a broad spectral range ideally suited for interrogation by semiconductor diode lasers. We have shown that the dosimeter yields an average hydrazine detectivity of 2.3 ppb-hr with a standard deviation of 1 ppb-hr, a value that meets U.S. Air Force current detection requirements. Prolonged exposures of the dosimeter to laboratory air have not adversely affected the dosimeter. Additionally, its response to ammonia vapor has been determined to be 9200 times smaller than its response to hydrazine vapor.

Paper Details

Date Published: 19 January 1995
PDF: 9 pages
Proc. SPIE 2367, Optical Sensors for Environmental and Chemical Process Monitoring, (19 January 1995); doi: 10.1117/12.199678
Show Author Affiliations
Charles M. Klimcak, The Aerospace Corp. (United States)
Gouri Radhakrishnan, The Aerospace Corp. (United States)
B. Jaduszliwer, The Aerospace Corp. (United States)


Published in SPIE Proceedings Vol. 2367:
Optical Sensors for Environmental and Chemical Process Monitoring
Ishwar D. Aggarwal; Stuart Farquharson; Eric Koglin, Editor(s)

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