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Optical Engineering

Fiber Bragg grating pressure sensor with ultrahigh sensitivity and reduced temperature sensitivity
Author(s): Wentao Zhang; Li Fang; Yuliang Liu
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Paper Abstract

A fiber Bragg grating (FBG) pressure sensing scheme based on a flat diaphragm and an L-shaped lever is presented. An L-shaped lever transfers the pressure-induced defection of the flat diaphragm to the axial elongation of the FBG. The curve where the L-shaped lever contacts the diaphragm is a segment of an Archimedes spiral, which is used to enhance the responsivity. Because the thermal expansion coefficient of the quartz-glass L-shaped lever and the steel sensor shell is different, the temperature effect is compensated for by optimizing the dimension parameters. Theoretical analysis is presented, and the experimental results show that an ultrahigh pressure responsivity of 244 pm/kPa and a low temperature responsivity of 2.8 pm/°C are achieved.

Paper Details

Date Published: 1 February 2009
PDF: 4 pages
Opt. Eng. 48(2) 024402 doi: 10.1117/1.3081058
Published in: Optical Engineering Volume 48, Issue 2
Show Author Affiliations
Wentao Zhang, Institute of Semiconductors (China)
Li Fang, Institute of Semiconductors (China)
Yuliang Liu, Institute of Semiconductors (China)

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