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Title: Laser-sculpted hybrid photonic magnetometer with nanoscale magnetostrictive interaction
Authors: Allsop, Thomas 
Lee, Graham B. 
Wang, Changle 
Neal, Ronald 
Kalli, Kyriacos 
Culverhouse, Philip 
Webb D., David J. 
Major Field of Science: Engineering and Technology
Field Category: Electrical Engineering - Electronic Engineering - Information Engineering
Keywords: Long period gratings;Magnetic sensors;Magnetostrictive material;Optical sensing
Issue Date: 1-Jan-2018
Source: Sensors and Actuators, A: Physical, 2018, vol. 269, pp. 545-555
Volume: 269
Start page: 545
End page: 555
Journal: Sensors and Actuators A: Physical 
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.
ISSN: 0924-4247
DOI: 10.1016/j.sna.2017.12.021
Rights: © The Authors. Published by Elsevier B.V.
Type: Article
Affiliation : Aston University 
University of Plymouth 
Cyprus University of Technology 
Appears in Collections:Άρθρα/Articles

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