In this paper, a novel Fiber Bragg gratings (FBGs) high alternating current sensor is proposed to measure alternating
current. The principle and sensing structure are introduced. The sensitivity of the high alternating current sensor is
13.8pm/A when the current is 1000A. The trend shows a good linearity between the wavelength shift and the square of
the current value which is consistent well with the principle and indicates that the proposed sensor is capable of
measuring high alternating current.
Current sensors always play a very important role in the power industry. For example, current sensors can provide the
key information for measurement, control and relay protection. However, when the economic further develops and the
level of current increases year by year, it is very difficult to meet the demand for current sensors based on conventional
technology which is still the main stream. Novel current sensors always are pursued. A research focusing on the current
sensor is the technology of fiber optic current sensor, because there is high resistance to electromagnetic interference in
fiber optic sensors. Fiber Bragg grating (FBG) sensors have been applied in many fields and have gained great
achievements. It is of great help to the current measurement if FBG current sensors are realized. In this paper, a novel
FBG high-current sensor is developed based on magnetic coupling. The principle is described, such as the magnetic
coupling, the structure of the sensor and the sensing data processing. Experiments are carried out, and the results show at
least 60 pm wavelength shift with the change of 100A and 2563 pm wavelength shift when the current is 750A and a
good repeatability. The results are in agreement with the principle and indicate that the proposed sensor is capable of
measuring both dc and ac current.
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