Abstract

Electric current sensor employing twisted fiber with a new compensation method for temperature and polarization perturbation is presented and demonstrated for ac current detection. The problem of sensor bias drifting caused by the change of twist induced circular birefringence of the fiber versus the ambient temperature, or by the mechanical perturbations in the sensor leads, is addressed and solved by a novel signal processing method. With the single Wollaston prism scheme described in the paper, the compensation is valid only for limited bias phase drift. However, when the modified compensation scheme is introduced, the current signal can be obtained for arbitrary bias phase drift. The compensation method is demonstrated effective and which provides a new approach for the practical application of twisted fiber in current sensor.

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