Intensity-Modulated Optical Fiber Sensor for AC Magnetic Field Detection

• 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: IEEE Photonics Technology Letters

Vol. 27

Pages: 2461-2464

ISSN: 1041-1135

Publisher: IEEE

Indexing

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Other information

Authenticus ID: P-00G-Q2S

DOI: 10.1109/lpt.2015.2470135

Abstract (EN): An erbium-doped (Er3+) fiber optic laser is proposed for sensing alternated magnetic fields by measuring the laser intensity modulation. The sensor is fabricated using two partially overlapped narrow-band fiber Bragg gratings (FBGs) and a section of doped fiber in a Fabry-Perot configuration. Laser power stability and bandwidth are studied while changing the overlap. A bulk rod of TbDyFe, a magnetostrictive material, is glued to both the FBGs and the laser wavelength and power are modulated according to the magnetic field. Acquisition and processing are done using virtual instrumentation. Results have shown the possibility of detecting 11.18 mu T-rms/root Hz for an alternating magnetic field of 4.17 mT(rms).

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 4