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| Error Characteristics in Mutual Conversion Process of Reflective Fiber Optic Current Transducer’s Optical Polarization State |
| Wang Lihui1,2, He Zhou3, Yan Jie1, Liu Xixiang1, Yan Jie1, Li Peijuan1 |
1. Southeast University Nanjing 210096 China;
2. Xian Institute of Optics and Precision Mechanics Xi’an 710119 China;
3. Henan Pinggao Electric Co Ltd. Pingdingshan 467001 China |
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Abstract Reflective fiber optic current transducer(R-FOCT) is a kind of precision instrument based on optical polarization and optical interference theory. The key optical components in R-FOCT show error characteristics in conversion between linear polarization state and circular polarization state, including quarter-wave retarder, sensing head and mirror, which induces linearly polarized light wave in polarization maintaining fiber and circularly polarized light wave in sensing fiber to be elliptically polarized light wave. Then nonreciprocal phase shift induced by magnetic field of the current is interrupted by wrong polarization state. Focused on polarization error characteristics during mutual conversion process in fiber optic current transducer, optical polarization error models are built by using Jones matrix and Poincare sphere respectively, investigated the influence of several key error factors on measurement accuracy and linearity of scale factor, including phase delay in quarter-wave retarder, birefringence in sensing head and mirror reflection phase shift error. Finally, the proposed methods are verified by simulation test, and scale factor error characteristics of R-FOCT related with optical polarization errors were quantified. The results verify the feasibility of the proposed research scheme.
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Received: 14 March 2011
Published: 27 November 2013
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2013, Vol. 28 
