Chinese Journal of Lasers, Volume. 31, Issue 4, 469(2004)
A Configuration of Optical Fiber Current Transducer for Elimination of Vibration Effect
Optical fiber current transducers based on Faraday effect have a lot of advantages over conventional current transducers and have been studied extensively. The intrinsic birefringence of the sensing fiber is the main cause which affects the measuring precision, and how to eliminate it is the key research topic. The birefringence is not only affected by the features of fiber itself but also is under the influence of environment factors such as temperature and vibration. When a optical fiber current transducer is intensely vibrated, the mechanical stress will change the intrinsic birefringence of the sensing fiber, affecting the output light state of polarization and deteriorating the measuring precision. In this paper a symmetrical transducer configuration with two identical light sources and photodiodes is presented. Two counter-propagating light beams are formed in the sensing fiber and stress-induced linear birefringence is compensated by its reciprocal nature. The experimental results show that this configuration can obviously improve the performance of the transducer and the signal linearity is achieved under ±0.3% with the sensor head exposed to a vibration level of acceleration 10 g.
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[in Chinese], [in Chinese], [in Chinese]. A Configuration of Optical Fiber Current Transducer for Elimination of Vibration Effect[J]. Chinese Journal of Lasers, 2004, 31(4): 469