A novel photonic magnetometer for detection of low frequency magnetic fields

John Matthews; Leonid Bukshpun; Ranjit Pradhan

doi:10.1117/12.897421

7 September 2011 A novel photonic magnetometer for detection of low frequency magnetic fields

John Matthews, Leonid Bukshpun, Ranjit Pradhan

Proceedings Volume 8120, Photonic Fiber and Crystal Devices: Advances in Materials and Innovations in Device Applications V; 81201P (2011) https://doi.org/10.1117/12.897421
Event: SPIE Photonic Devices + Applications, 2011, San Diego, California, United States

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.

Citation Download Citation

John Matthews, Leonid Bukshpun, and Ranjit Pradhan "A novel photonic magnetometer for detection of low frequency magnetic fields", Proc. SPIE 8120, Photonic Fiber and Crystal Devices: Advances in Materials and Innovations in Device Applications V, 81201P (7 September 2011); https://doi.org/10.1117/12.897421

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