Fiber Bragg grating pressure sensor with ultrahigh sensitivity and reduced temperature sensitivity

Wentao Zhang; Li Fang; Yuliang Liu

doi:10.1117/1.3081058

1 February 2009 Fiber Bragg grating pressure sensor with ultrahigh sensitivity and reduced temperature sensitivity

Wentao Zhang, Li Fang, Yuliang Liu

Author Affiliations +

Optical Engineering, Vol. 48, Issue 2, 024402 (February 2009). https://doi.org/10.1117/1.3081058

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.

©(2009) Society of Photo-Optical Instrumentation Engineers (SPIE)

Citation Download Citation

Wentao Zhang, Li Fang, and Yuliang Liu "Fiber Bragg grating pressure sensor with ultrahigh sensitivity and reduced temperature sensitivity," Optical Engineering 48(2), 024402 (1 February 2009). https://doi.org/10.1117/1.3081058

Published: 1 February 2009

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