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Proceedings Paper

Applications of LPG fiber optical sensors for relative humidity and chemical-warfare-agents monitoring
Author(s): Shufang Luo; Yongcheng Liu; Artur Sucheta; Mishell K. Evans; Roger Van Tassell
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Paper Abstract

A long-period grating (LPG) fiber optic sensor has been developed for monitoring the relative humidity levels and toxic chemicals, especially the chemical warfare agents. The principle of operation of this sensor is based on monitoring the refractive index changes exhibited by the reactive coating applied to the surface of the LPG region in response to analytes. Specific interaction of the analyte with the thin film polymer coating produces as the output a wavelength shift that can be correlated with the concentration of the analyte. Thin polymer coating for relative humidity sensor is made of carboxymethylcellulose (CMC) covalently bound to the surface of the fiber. Coating for chemical warfare agent detection employs metal nanoclusters imbedded in polyethylenimine (PEI) for specific reaction. The relative humidity level can be determined from 0% to 95% and the level of toxic chemicals can be determined is at least on the scale of 1 ppm. This small-size and low-cost LPG fiber optic sensor exhibited high sensitivity, rapid response, repeatability and durability. The goal of developing relative humidity sensor is to produce a fiber optic sensor-based health monitoring system for building, while the chemical sensor has found its application in point detection network for chemical warfare agent monitoring.

Paper Details

Date Published: 9 September 2002
PDF: 12 pages
Proc. SPIE 4920, Advanced Sensor Systems and Applications, (9 September 2002); doi: 10.1117/12.481973
Show Author Affiliations
Shufang Luo, Luna Innovations (United States)
Yongcheng Liu, Luna Innovations (United States)
Artur Sucheta, Luna Innovations (United States)
Mishell K. Evans, Luna Innovations (United States)
Roger Van Tassell, Luna Innovations (United States)

Published in SPIE Proceedings Vol. 4920:
Advanced Sensor Systems and Applications
Yun-Jiang Rao; Julian D. C. Jones; Hiroshi Naruse; Robert I. Chen, Editor(s)

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