Coil of optical fiber current sensor and optical fiber current sensor

Abstract

The invention relates to a coil of an optical fiber current sensor and the optical fiber current sensor. The coil comprises a first current sensing light path which is wound on a current to be measured and a second current sensing light path which is wound on the current to be measured and is opposite to the first current sensing light path in winding direction. The invention provides the coil of the optical fiber current sensor and the optical fiber current sensor, which are high in sensitivity and precision, are insensitive to vibration as the Sagnac effect can be eliminated, and are insensitive to a temperature as double-light-path sensing is adopted.

Description

technical field [0001] The invention belongs to the technical field of optical fiber sensing and relates to a sensor, in particular to an optical fiber current sensor coil and an optical fiber current sensor. Background technique [0002] Current is one of the basic parameters of the power system. The measurement of current is its basic and very important task. According to the measurement results, it can provide the power system with the necessary information for metering, control and relay protection. Measurement tools have high demands. In recent years, with the rapid economic development of various countries, the demand for electric power is increasing day by day, the rated voltage level and rated current of the power system have been greatly improved, and the traditional electromagnetic current measuring equipment has become increasingly unable to meet the requirements. [0003] Optical fiber current sensing was developed to overcome the shortcomings of electromagnetic...

AI Technical Summary

Problems solved by technology

The main problems that limit the practicality of fiber optic current sensors are: the Sagnac phase error caused by vibration or rotation, the phase error caused by the residual linear birefringence in the fiber when the temperature changes, etc.

This phase error and the Faraday phase shift together affect the output light intensity detected by the detector, thus causing errors in the measurement results, and finally causing errors in the calculated current to be measured, and the zero deviation of the sensor output is large

At the same time, a dual-axis modulator is required for phase modulation, which increases the complexity of the system and weakens the stability

And in the modulation process, it will cause crosstalk between two orthogonal modes, which will affect the measurement accuracy

[0008] Therefore, based on these technical defects, these current sensors cannot meet the actual needs at present, which limits their wide application in engineering.

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