11 October 2010 Intensity-modulated and temperature-insensitive fiber Bragg grating vibration sensor
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Abstract
An intensity-modulated, fiber Bragg grating (FBG) vibration sensor is proposed and experimentally demonstrated. The sensing mechanism is based on the measurement of optical power of a strain-chirped FBG. An initially-uniform FBG is glued with a slanted direction onto the lateral surface of a simply-supported beam (SSB). A mass is fixed in the middle of the beam, which can transfer the vertical vibration to the deflection of the beam. Therefore, deflection induced nouniform strain is applied along the sensing FBG and makes it chirped. The reflected optical power from the FBG is measured with a photodetector (PD) and an oscilloscope. The experimental results are compared with the measurement results of a resistance strain sensor, and good agreement is achieved. Furthermore, this sensor is cost-effective and inherently insensitive to temperature.
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Lan Li, Xinying Dong, Shuqin Zhang, Chunliu Zhao, Yiling Sun, "Intensity-modulated and temperature-insensitive fiber Bragg grating vibration sensor", Proc. SPIE 7656, 5th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical Test and Measurement Technology and Equipment, 76561G (11 October 2010); doi: 10.1117/12.864894; https://doi.org/10.1117/12.864894
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