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Temperature-independent strain sensor system using a tilted fiber Bragg grating demodulator

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6 Author(s)
Sung Chul Kang ; Photonics Res. Center, Korea Inst. of Sci. & Technol., Seoul, South Korea ; Se Yoon Kim ; Sang Bae Lee ; Seo Won Kwon
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We experimentally demonstrate a new approach for the demodulation of a fiber Bragg grating (FBG) strain sensor by combining a tilted FBG demodulator with a temperature-independent property and a dual head FBG sensor with a temperature-discriminating property. This technique guarantees a stable measurement independent of temperature perturbation at both sides of sensor and demodulator without any additional temperature-isolation or temperature-referencing process and has the minimum resolvable strain of 10 μstrain. The ranges of operating temperature at the sensor and at the demodulator which guarantee a dynamic range of 1800 μstrain corresponding to the wavelength difference 2.2 nm between two notches of the tilted FBG spectrum are from room temperature to 180/spl deg/C and 140/spl deg/C, respectively.

Published in:

Photonics Technology Letters, IEEE  (Volume:10 ,  Issue: 10 )