Remote fiber optic dosimeter for detecting hydrazine vapor

Charles M. Klimcak; Gouri Radhakrishnan; B. Jaduszliwer

doi:10.1117/12.199678

19 January 1995 Remote fiber optic dosimeter for detecting hydrazine vapor

Charles M. Klimcak, Gouri Radhakrishnan, B. Jaduszliwer

Proceedings Volume 2367, Optical Sensors for Environmental and Chemical Process Monitoring; (1995) https://doi.org/10.1117/12.199678
Event: Optical Sensing for Environmental and Process Monitoring, 1994, McLean, VA, United States

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.

Citation Download Citation

Charles M. Klimcak, Gouri Radhakrishnan, and B. Jaduszliwer "Remote fiber optic dosimeter for detecting hydrazine vapor", Proc. SPIE 2367, Optical Sensors for Environmental and Chemical Process Monitoring, (19 January 1995); https://doi.org/10.1117/12.199678

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