Passive interferometric interrogation of a magnetic field sensor using an erbium doped fiber optic laser with magnetostrictive transducer

• Type: Article in International Scientific Journal
• Date: 2015

Authors

Nascimento, IM (Author) Other; Baptista, JM (Author) Other; Jorge, PAS (Author) FCUP; Cruz, JL (Author) Other; Andres, MV (Author) Other

Journal

Title: Sensors and Actuators, A: Physical

Vol. 235

Pages: 227-233

ISSN: 0924-4247

Publisher: Elsevier

Indexing

ISI Web of Knowledge - 8 Citations

Scopus - 9 Citations

Other information

Authenticus ID: P-00G-SDZ

DOI: 10.1016/j.sna.2015.10.021

Abstract (EN): An erbium doped (Er3+) fiber optic laser is proposed for magnetic field measurement. A pair of FBGs glued onto a magnetostrictive material (Terfenol-D rod) modulates the laser wavelength operation when subject to a static or a time dependent magnetic field. A passive interferometer is employed to measure the laser wavelength changes due to the applied magnetic field. A data acquisition hardware and a Lab VIEW software measure three phase-shifted signals at the output coupler of the interferometer and process them using two distinct demodulation algorithms. Results show that sensitivity to varying magnetic fields can be tuned by introducing a biasing magnetic field. A maximum error of 0.79% was found, for magnetic fields higher than 2.26 mT(RMS).

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 7