INTENSITY-MODULATED AND TEMPERATURE-INSENSITIVE FIBER BRAGG GRATING VIBRATION SENSOR

Lan Li, Xinyong Dong, Yangqing Qiu, Chunliu Zhao, Yiling Sun

Abstract

An intensity-modulated, fiber Bragg grating (FBG) vibration sensor is proposed and experimentally demonstrated. An initially-uniform FBG is glued with a slanted direction onto the lateral surface of a simply-supported beam (SSB). A mass fixed in the middle of the beam transfers the vertical vibration to the deflection of the beam. Nouniform strain field generated by beam bending is applied along the FBG and makes it chirped. The sensing mechanism is based on the measurement of reflected optical power of a strain-chirped FBG. The optical power from the FBG is measured with a photodetector (PD) and an oscilloscope. A resistance strain gauge is used for the comparison purpose and good agreement is achieved. Furthermore, this sensor is cost-effective and inherently insensitive to temperature.

Keywords

Fiber Bragg grating (FBG), simply-supported beam (SSB), vibration, temperature-insensitive

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DOI

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IMEKO TC

TC2 - Photonics

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