Improved fiber-optic magnetometer based on iron garnet crystals

K. B. Rochford

doi:10.1117/12.2302319

9 November 2000 Improved fiber-optic magnetometer based on iron garnet crystals

K. B. Rochford

Proceedings Volume 4185, Fourteenth International Conference on Optical Fiber Sensors; 41854W (2000) https://doi.org/10.1117/12.2302319
Event: Fourteenth International Conference on Optical Fiber Sensors, 2000, Venice, Italy

Abstract

We demonstrate a single-lead fiber optic magnetic field sensor system based on ferrimagnetic iron garnet crystals. This system automatically compensates for magnetic domain fluctuations in the transducer. Noise floors of 1.1 nT/Hz^1/2 at 1 kHz are demonstrated without ferrite flux concentrators. Use of a single distal ferrite flux concentrator improves the sensitivity and noise floor by 17 dB with a frequency response of ~180 MHz; this represents a 3x improvement in gain-bandwidth product over previous reports. Using a pair of flux concentrators yields a 29 dB improvement and a noise floor of 35 pT/Hz^1/2 at 1 kHz.

Citation Download Citation

K. B. Rochford "Improved fiber-optic magnetometer based on iron garnet crystals", Proc. SPIE 4185, Fourteenth International Conference on Optical Fiber Sensors, 41854W (9 November 2000); https://doi.org/10.1117/12.2302319

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