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Proceedings Paper

Improved fiber-optic magnetometer based on iron garnet crystals
Author(s): K. B. Rochford
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Paper 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/Hz1/2 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/Hz1/2 at 1 kHz.

Paper Details

Date Published: 9 November 2000
PDF: 4 pages
Proc. SPIE 4185, Fourteenth International Conference on Optical Fiber Sensors, 41854W (9 November 2000); doi: 10.1117/12.2302319
Show Author Affiliations
K. B. Rochford, National Institute of Standards and Technology (United States)

Published in SPIE Proceedings Vol. 4185:
Fourteenth International Conference on Optical Fiber Sensors
A. G. Mignani; H. C. Lefèvre, Editor(s)

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