Reversible evanescent wave sensors for hydrazine

Michael T. Carter; Jimmy R. Smith; Donald R. Mowry; Jay G. Patel

doi:10.1117/12.339788

23 February 1999 Reversible evanescent wave sensors for hydrazine

Michael T. Carter, Jimmy R. Smith, Donald R. Mowry, Jay G. Patel

Proceedings Volume 3540, Chemical, Biochemical, and Environmental Fiber Sensors X; (1999) https://doi.org/10.1117/12.339788
Event: Photonics East (ISAM, VVDC, IEMB), 1998, Boston, MA, United States

Abstract

We report recent progress on development of evanescent wave fiber optic sensors for hydrazine (HZ), monomethylhydrazine (MMH) and unsymmetrical dimethylhydrazine (UDMH). Chemically reversible evanescent sensors capable of detection below 10 ppb were prepared by removing cladding from commercial multimode fiber and coating the exposed core with a hydrazine-sensitive triphenylmethane dye immobilized in an inert polymer matrix, typically poly(vinylchloride). Triphenylmethane dyes bleach reversibly in the presence of hydrazines, enabling colorimetric sensing. The linear dynamic range was typically 0 - 300 ppb and overall dynamic range up to ca. 5 ppm. Sensors optimized for HZ were as much as a factor of 45 less sensitive to MMH and UDMH, suggesting that the sensor film would require optimization for each analyte. Saturation response and relaxation times were on the order of 5 - 8 min, but measurable signals for 10 ppb HZ could be obtained in under 30 s. These sensors demonstrate a novel route to reversible sensing of these highly toxic compounds.

Citation Download Citation

Michael T. Carter, Jimmy R. Smith, Donald R. Mowry, and Jay G. Patel "Reversible evanescent wave sensors for hydrazine", Proc. SPIE 3540, Chemical, Biochemical, and Environmental Fiber Sensors X, (23 February 1999); https://doi.org/10.1117/12.339788

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