Title

Nano-structured Pd-long Period Fiber Gratings Integrated Optical Sensor for Hydrogen Detection

Abstract

A fiber-optic sensor for detecting hydrogen at various temperatures (30-200 °C) is reported in this paper. The sensor is composed of a long period fiber gratings coated with a nano-structured Pd thin layer as the sensing material. The sensing principle of the designed sensor is based on the change of the refractive index of the Pd thin layer upon exposure to hydrogen, which causes the resonance wavelength shift of the long period fiber gratings. The Pd layer prepared by sputter deposition has nanograins of 30-40 nm in size. The resonance wavelength of the long period fiber gratings coated with Pd decreases as hydrogen concentration increases from 0% to 16% at all temperatures. There is a significant wavelength shift of the sensor when the Pd film goes through the phase transition between α and β phases. The sensor has a short response time with a relatively slower recovery rate. The sensor maintains its functionality after several cycles of hydrogen detection and recovery.

Department(s)

Electrical and Computer Engineering

Sponsor(s)

United States. Department of Energy

Keywords and Phrases

Pd; Hydrogen Sensor; Long Period Fiber Gratings; Response Time

Library of Congress Subject Headings

Stability

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2008 Elsevier, All rights reserved.


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