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Proceedings Paper

A novel photonic magnetometer for detection of low frequency magnetic fields
Author(s): John Matthews; Leonid Bukshpun; Ranjit Pradhan
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Paper Abstract

A novel photonic magnetometer for a variety of applications is being developed. The detection mechanism is similar to existing fiber optic magnetometers, in which a magnetostrictive element transduces magnetic field variations into changes in optical path length, subsequently detected through optical interferometry. Single-axis and three-axis vector magnetometers have been designed, and other application-specific configurations have also been investigated. The sensor noise floor is estimated at 20 pT/√Hz for frequencies of 0.1 Hz and above, with a dynamic range of over 100,000 nT. The sensor can be compact (down to 1 cm3) and can consume less than 100 milliwatts of power. These features, combined with its low 1/f noise and wide dynamic range, make the photonic magnetometer an easily deployable detector of low-frequency magnetic fields. Potential applications of the novel photonic magnetometer, including space-based measurement of geomagnetic fields, medical biomagnetic imaging, vehicle detection, mine detection, heading sensors, low-frequency communications, and deep eddy current nondestructive evaluation, have been explored as well.

Paper Details

Date Published: 7 September 2011
PDF: 11 pages
Proc. SPIE 8120, Photonic Fiber and Crystal Devices: Advances in Materials and Innovations in Device Applications V, 81201P (7 September 2011); doi: 10.1117/12.897421
Show Author Affiliations
John Matthews, Physical Optics Corp. (United States)
Leonid Bukshpun, Physical Optics Corp. (United States)
Ranjit Pradhan, Physical Optics Corp. (United States)

Published in SPIE Proceedings Vol. 8120:
Photonic Fiber and Crystal Devices: Advances in Materials and Innovations in Device Applications V
Shizhuo Yin; Ruyan Guo, Editor(s)

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