3×3 Sagnac fiber-optic high voltage current sensor

The article proposed a novel fiber optic interferometic current sensor, analyzed its principle, worked out its mathematics model, tested its rationality Compared with the fiber optic current sensors based Faraday effection, the sensor can compensate interferences from fiber optic birefringence, tempreture and source amplitude noise is eliminated; Compared with the common Sagnac interferometers, its dynamic range is extended