Intensity-Modulated Optical Fiber Sensor for AC Magnetic Field Detection

被引：6
|
作者：
Nascimento, Ivo M. [1 ,2 ]
Baptista, J. M. [1 ,3 ]
Jorge, P. A. S. [1 ]
Cruz, Jose L. [4 ]
Andres, Miguel V. [4 ]
机构：
[1] Inst Engn Sistemas & Computadores Tecnol & Cienci, P-4200 Oporto, Portugal
[2] Univ Porto, Fac Ciencias, P-4099002 Oporto, Portugal
[3] Univ Madeira, Ctr Competencias Ciencias Exatas & Engn, P-9000082 Funchal, Portugal
[4] Univ Valencia, Dept Appl Phys & Electromagnetism, Valencia 46010, Spain
来源：
IEEE PHOTONICS TECHNOLOGY LETTERS | 2015年 / 27卷 / 23期
关键词：
Magnetic field sensor; magnetostrictive material; erbium doped fiber laser; intensity modulation; LASER;
D O I：
10.1109/LPT.2015.2470135
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
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).
引用
收藏
页码：2461 / 2464
页数：4
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