7 September 2011 A novel photonic magnetometer for detection of low frequency magnetic fields
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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.
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John Matthews, John Matthews, Leonid Bukshpun, Leonid Bukshpun, Ranjit Pradhan, 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); doi: 10.1117/12.897421; https://doi.org/10.1117/12.897421
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