Abstract

A long period fiber grating (LPFG) temperature sensor system based on intensity modulation is developed. The LPFG employed is fabricated by the use of a focused ${\text{CO}}_2$ laser beam to carve periodic grooves on the fiber. The temperature measurement resolution of up to $0.1°\text{C}$ has been obtained within the temperature range between 20 °C and $\text{100}°\text{C}$. The system uses a simple intensity measurement method and exhibits the advantages of convenient intensity measurement, double temperature sensitivity, high resolution, simple configuration, and low cost.

© 2006 Optical Society of America

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