Temperature-independent accelerometer with a strain-chirped fiber Bragg grating

Lan Li; Xinyong Dong; Wenjun Zhou; Yiling Sun

doi:10.1117/12.851270

25 November 2009 Temperature-independent accelerometer with a strain-chirped fiber Bragg grating

Lan Li, Xinyong Dong, Wenjun Zhou, Yiling Sun

Proceedings Volume 7634, Optical Sensors and Biophotonics; 76340G (2009) https://doi.org/10.1117/12.851270
Event: Asia Communications and Photonics, 2009, Shanghai, Shanghai , China

Abstract

A novel fiber optic accelerometer is proposed and demonstrated. The sensing mechanism is based on the measurement of bandwidth and optical power of a strain-chirped fiber Bragg grating (FBG). An initially-uniform FBG is glued with a slanted direction onto the lateral surface of a simply-supported beam. Two masses are fixed on the top and bottom surfaces in the middle of the beam respectively, which can transfer the vertical acceleration to the deflection of the beam. Therefore, deflection induced nouniform strain is applied along the sensing FBG and makes it chirped. Experimental results show that 3-dB bandwidth and reflected optical power of the strain-chirped FBG responds to acceleration sensitively. The achieved sensitivities are up to 0.4 nm/g and 4.57 μW/g respectively in the linear range. Furthermore, this sensor is very cost-effective and inherently insensitive to temperature due to the simple demodulation method.

Citation Download Citation

Lan Li, Xinyong Dong, Wenjun Zhou, and Yiling Sun "Temperature-independent accelerometer with a strain-chirped fiber Bragg grating", Proc. SPIE 7634, Optical Sensors and Biophotonics, 76340G (25 November 2009); https://doi.org/10.1117/12.851270

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