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Optical fiber long-period grating with solgel coating for gas sensor

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Abstract

The novel long-period fiber grating (LPFG) film sensor is composed of the long-period grating coated with solgel-derived sensitive films. The characteristics of the transmissivity of the LPFG film sensor are studied. By analyzing the relation among the sensitivity Sn, the thin film optical parameters, and the fiber grating parameters, the optimal design parameters of the LPFG film sensor are obtained. Data simulation shows that the resolution of the refractive index of this LPFG film sensor is predicted to be 108. Experimentally, a LPFG film sensor for detection of C2H5OH was fabricated, and a preliminary gas-sensing test was performed.

© 2006 Optical Society of America

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