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Proceedings Article

Applications of LPG fiber optical sensors for
relative humidity and chemical-warfare-agents monitoring

Shufang
Luo ; Yongcheng Liu ; Artur Sucheta ; Mishell K. Evans ; Roger Van Tassell

[+-]
Author Affiliations

Shufang Luo,
Yongcheng Liu, Artur Sucheta, Mishell
K. Evans, Roger Van Tassell

Luna Innovations (USA)

SPIE
doi:10.1117/12.481973

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Article

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.

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Topics
Chemical
weapons ; Chemicals
; Coating
; Fiber
optics ; Fiber
optics sensors ; Humidity
; Metals
; Networks
; Polymers
; Refractive
index

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Luo S, Liu Y, Sucheta A, Evans MK, Van Tassell R; Applications of lpg fiber optical sensors for relative humidity and chemical-warfare-agents monitoring. Photonics Asia 2002. 0001;():193-204.

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