Abstract
We present a new photonic magnetic sensor that can yield information on the spatial angle of rotation of the sensor within a given static magnetic field that based upon an optical fiber platform that has a wavelength-encoded output and a demonstrated sensitivity of 543 pm/mT. This optical fiber magnetic field sensor combines a conventional, UV-laser inscribed long period grating (LPG) with a magnetostrictive material Terfenol-D that coats and fills 50-µm micro-slots running adjacent and parallel to the fiber central axis. The micro-slots are produced using a femtosecond laser and selective chemical etching. A detection limit for a static magnetic field strength of ±50 µT is realized in low strength DC magnetic field (below 0.4 mT), this performance approaches the Earth’s magnetic field strength and thus, once optimized, has potential for navigation applications. Our method addresses the major drawback of conventional sensors, namely their inadequate sensitivity to low strength, static magnetic fields and their inability to provide information about the orientation and magnitude.
DOI
10.1016/j.sna.2017.12.021
Publication Date
2017-12-12
Publication Title
Sensors and Actuators A: Physical
Volume
269
Publisher
Elsevier BV
ISSN
0924-4247
Embargo Period
2024-11-22
First Page
545
Last Page
555
Recommended Citation
Allsop, T., Lee, G., Wang, C., Neal, R., & et al. (2017) 'Laser-sculpted hybrid photonic magnetometer with nanoscale magnetostrictive interaction', Sensors and Actuators A: Physical, 269, pp. 545-555. Elsevier BV: Available at: https://doi.org/10.1016/j.sna.2017.12.021
Comments
keywords: Magnetostrictive material, Long period gratings, Optical sensing, Magnetic sensors