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Miniature optical fiber sensor for alternating magnetic fields based on In-BiCa vanadium iron garnet crystal

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4 Author(s)
Zhou Meng ; Dept. of Appl. Phys., Nat. Univ. of Defence & Technol., Hunan, China ; Yongming Hu ; Zhe Chen ; Long, Xingwu

This paper introduces a high-sensitivity miniature optical fiber sensor for alternating magnetic fields based on the Faraday effect in bulk indium bismuth calcium vanadium iron garnet (In-BiCaVIG). It discusses the effects of the crystal's magnetic hysteresis on the sensor in detail. Because of its construction, and the methods that reduce the effects of the hysteresis, the sensor has a noise-equivalent magnetic field of 10-8 T/√(Hz) at 50 Hz and reaches an accuracy of 1% while the alternating magnetic field is changed from 0 to 45×10-4 T over the temperature range from -20°C to 50°C. The sensing head is only 0.003 m×0.15 m in size

Published in:

Magnetics, IEEE Transactions on  (Volume:37 ,  Issue: 5 )