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A lateral pressure sensor using a fiber Bragg grating

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5 Author(s)
Sheng, H.-J. ; Dept. of Electr. Eng., Nat. Defense Univ., Taiwan ; Ming-Yue Fu ; Tzu-Chiang Chen ; Wen-Fung Liu
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This study develops an all-optical high-sensitivity pressure sensor based on fiber Bragg grating (FBG) encapsulated in a polymer-half-filled metal cylinder. The polymer can be pressurized along one radial direction only, and responds to an axial force on the round plate, creating an axial stretched-strain on the FBG. The measured pressure sensitivity is 2.2×10-2 MPa-1, which is 10 900 times higher than for a bare FBG. Owing to its good linearity, this sensor can be applied to measure medium pressure, liquid level, and depth underwater.

Published in:

Photonics Technology Letters, IEEE  (Volume:16 ,  Issue: 4 )