A fiber-optic current sensor based on a differentiating Sagnac interferometer

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...

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Bibliographic Details
Published inIEEE transactions on instrumentation and measurement Vol. 50; no. 3; pp. 705 - 708
Main Authors Wang, Tingyu, Luo, Chengmu, Zheng, Shengxuan
Format Journal Article
LanguageEnglish
Published New York IEEE 01.06.2001
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects
Coils
Current measurement
Electric variables measurement
Optical fiber sensors
Phase measurement
Piezoelectric transducers
Power measurement
Sagnac interferometers
Sensor systems
Temperature sensors
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Summary: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.
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ISSN:0018-9456
1557-9662
DOI:10.1109/19.930443