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Proceedings Paper

Fiber optic pressure sensing method based on Sagnac interferometer
Author(s): Yi Zhang; Zhi Zhuang; Ying Chen; Yuanhong Yang
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Paper Abstract

Pressure method using polarization-maintaining photonic crystal fiber (PM-PCF) as sensing element based on Sagnac interferometer is proposed to monitor inter layer pressure in especial compact structure. Sensing model is analyzed and test system is set up, which is validated by experiment. The birefringence can be modified by the deformation of PM-PCF under transverse pressure, realizing pressure measurement by detecting the wavelength shift of one specific valley from output of the Sagnac interferometer. The experiment results show that the output interference fringes were shifted linearly with pressure. The dynamic range of 0 kN ~10kN, sensing precision of 2.6%, and pressure sensitivity of 0.4414nm/kN are achieved, and the strain relaxation phenomenon of cushion can be observed obviously. The sensor has better engineering practicability and capability to restrain interference brought up by fluctuation of environment temperature, which temperature sensitivity is -11.8pm/°C.

Paper Details

Date Published: 11 November 2014
PDF: 6 pages
Proc. SPIE 9274, Advanced Sensor Systems and Applications VI, 92740V (11 November 2014);
Show Author Affiliations
Yi Zhang, China Academy of Engineering Physics (China)
Zhi Zhuang, China Academy of Engineering Physics (China)
Ying Chen, China Academy of Engineering Physics (China)
Yuanhong Yang, BeiHang Univ. (China)

Published in SPIE Proceedings Vol. 9274:
Advanced Sensor Systems and Applications VI
Tiegen Liu; Shibin Jiang; Niels Neumann, Editor(s)

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