Development of an Optical Probe Current Sensor for Local and Narrow Area Measurement Using Magnetic Domain Reversal in Bismuth-Substituted Rare-Earth Iron Garnet Crystal

The authors have developed an optical probe electric current sensor using a Faraday effect of granular magnetic film as a new current sensor to replace a current transformer and a Rogowski coil. However, the sensitivity for small current fields in the previously developed sensor was low, and the sig...

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Bibliographic Details
Published inIEEE transactions on magnetics Vol. 59; no. 11; p. 1
Main Authors Sue, Satoshi, Miyamoto, Mitsunori, Kubo, Toshiya, Sonehara, Makoto, Sato, Toshiro
Format Journal Article
LanguageEnglish
Published New York IEEE 01.11.2023
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects
Bismuth
bismuth-substituted rare-earth iron garnet
Crystals
Diameters
Faraday effect
Garnets
Iron
Magnetic domains
Magnetic films
Magnetic heads
Magnetism
Noise measurement
optical fiber current sensor
Optical fiber sensors
Optical fibers
Optical interferometry
Rare earth elements
Robot sensing systems
Signal to noise ratio
stripe domains
Substitutes
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Summary:The authors have developed an optical probe electric current sensor using a Faraday effect of granular magnetic film as a new current sensor to replace a current transformer and a Rogowski coil. However, the sensitivity for small current fields in the previously developed sensor was low, and the signal was buried in the floor noise, making accurate measurement impossible. In this study, we investigated a sensor using magnetic domain reversal of Bi:RIG crystal for Faraday element to solve the previous problem and succeeded in developing a sensor with excellent linearity and a high signal-to-noise ratio by optimizing the Bi:RIG crystal thickness and the light-beam diameter to be irradiated.
ISSN:0018-9464
1941-0069
DOI:10.1109/TMAG.2023.3292395