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.