The Circular Birefringence-Insensitive FBG Sensor for Weak Pressure

Hui Peng, Bi-hua Zhou, Li-hua Shi, Cheng Gao

National Key Laboratory on Electromagnetic Environment Effects and Electro-optical Engineering, PLA University of Science and Technology, Nanjing, Jiangsu, China..

DOI: 10.4236/jcc.2013.17003                

Abstract

The influence of the circular birefringence on the measurement performance was analyzed based on the Polarization Properties of FBG in this paper. Due to the circular birefringence, the linear relationship between the max of PDL and pressure has been broken down. To estimate the cross sensitivity, a new parameter named relative peak of PDL (RP_PDL) is proposed. Under different circular birefringence, the same pressure sensitivity of sensor has been achieved. The theo- retical analysis and experiment results prove that transverse strain sensor of FBG is insensitive to the circular birefrin- gence by applying the RP_PDL. This research can be provided to useful and practical application.

Keywords

Circularly Birefringence; Polarization Propertied; FBG Weak Pressure Sensor; The Relative Peak of PDL (RPPDL)

Conflicts of Interest

The authors declare no conflicts of interest.

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