Title :
Magnetic field sensors based on a ring interferometry
Author :
Kamada, O. ; Tamura, H.
Author_Institution :
Dept. of Electron. Eng., Polytech. Univ., Kanagawa, Japan
fDate :
9/1/1999 12:00:00 AM
Abstract :
In this paper, magnetic field sensors based on ring interferometry are studied to enable the measurement of direct (DC) magnetic field as well as alternating (AC) magnetic field. By experiments using (CdMn)Te crystals as a Faraday element, the relative error within ±1% was obtained for AC magnetic field of up to 15 kA/m. Then, by introducing a phase modulation technique to this interferometry, DC magnetic field measurement with high sensitivity of 0.5×10-2%/A/m is realized
Keywords :
Faraday effect; light interferometry; magnetic field measurement; magneto-optical sensors; phase modulation; (CdMn)Te; (CdMn)Te crystals; AC magnetic field measurement; DC magnetic field measurement; Faraday element; high sensitivity; magnetic field interferometric sensors; phase modulation technique; ring interferometry; Magnetic field measurement; Magnetic fields; Magnetic sensors; Optical beams; Optical interferometry; Optical modulation; Optical sensors; Optical signal processing; Phase modulation; Signal processing;
Journal_Title :
Magnetics, IEEE Transactions on
