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Intensity-modulated and temperature-insensitive fiber Bragg
grating vibration sensor
Lan Li, Xinyong Dong, Yangqing Qiu, Chunliu Zhao and Yiling Sun
Institute of Optoelectronic Technology, China Jiliang University, Hangzhou, China,
310018
E-mail: xydong@cjlu.edu.cn
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.
Key words: Fiber Bragg grating (FBG), simply-supported beam (SSB), vibration,
temperature-insensitive
PACS: 42.81.Pa, 07 .60.Vg
1. Introduction
Fiber Bragg grating (FBG) sensors have been studied for more than two decades. FBG sensors are very
attractive because they have many advantages over conventional electrical sensors, such as high sensitivity,
remote sensing, low loss transmission, light weight
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