Title :
A fiber-optic current sensor based on a differentiating Sagnac interferometer
Author :
Wang, Tingyu ; Luo, Chengmu ; Zheng, Shengxuan
Author_Institution :
Dept. of Electr. Eng. & Appl. Electron. Technol., Tsinghua Univ., Beijing, China
fDate :
6/1/2001 12:00:00 AM
Abstract :
A fiber-optic current sensor (FOGS) based on a differentiating Sagnac interferometer (DSI) is demonstrated to measure high-voltage ac current in electric power systems from 5 A to 3200 A. A transducer consisting of Rogowski coil and piezoelectric cylinder (PZT) is used as the phase modulator, which is placed in the high-voltage side. The DSI is placed in the ground side. A simple analytical expression for the sensor has been derived, and the input-output performance and the temperature dependence of FOGS have been experimentally investigated. The simple sensor geometry gives high accuracy and sensitivity, wide dynamic range, and immunity from slow-variance temperature and other environmental fluctuations
Keywords :
coils; electric current measurement; fibre optic sensors; light interferometers; 5 A to 3200 A; 5 to 3200 A; Rogowski coil; accuracy; differentiating Sagnac interferometer; dynamic range; environmental fluctuations; fiber-optic current sensor; high-voltage ac current; phase modulator; piezoelectric cylinder; sensitivity; sensor geometry; slow-variance temperature; Coils; Current measurement; Electric variables measurement; Optical fiber sensors; Phase measurement; Piezoelectric transducers; Power measurement; Sagnac interferometers; Sensor systems; Temperature sensors;
Journal_Title :
Instrumentation and Measurement, IEEE Transactions on
