Compact magnetic-field sensor based on optical microfiber Michelson interferometer and Fe3O4 nanofluid.

We report a magnetic-field sensor by merging the advantages of optical fiber Michelson interferometers with that of magnetic fluid. Compact and low-cost optical fiber Michelson interferometers were first fabricated by a high-frequency CO(2) laser, and then they were inserted into glass capillaries with water-based Fe(3)O(4) magnetic fluid as sensing elements. The sensing characteristics have been investigated and the experimental results show that the reflective spectrum of the fiber-magnetic sensor linearly shifted with the change of the magnetic-field strength that is perpendicular to the axial of the devices. The fiber-magnetic sensor with interference arm's diameter of 50 μm is most sensitive to the external magnetic field, and the sensitivity is up to 64.9 pm/mT, which is 20 times higher than that of 125 μm diameter.

[1]  Jen-Jie Chieh,et al.  Tunable optical switch using magnetic fluids , 2004 .

[2]  Il-Bum Kwon,et al.  Simultaneous sensing of the strain and points of failure in composite beams with an embedded fiber optic Michelson sensor , 1998 .

[3]  Shieh-Yueh Yang,et al.  Magnetically-modulated refractive index of magnetic fluid films , 2002 .

[4]  Yunbo Zeng,et al.  Soliton solutions to a higher order ito equation : Pfaffian technique , 2007 .

[5]  P. J. Ridler,et al.  Linear dichroism and birefringence effects in magnetic fluids , 1997 .

[6]  T. Du,et al.  THERMAL LENS COUPLED MAGNETO-OPTICAL EFFECT IN A FERROFLUID , 1994 .

[7]  Kin Seng Chiang,et al.  Characterization of Long-Period Fiber Gratings Written by CO$_{2}$ Laser in Twisted Single-Mode Fibers , 2009, Journal of Lightwave Technology.

[8]  Yong Zhao,et al.  Novel optical fiber current sensor based on magnetic fluid , 2010 .

[9]  Wei Wang,et al.  Michelson interferometer-based fiber-optic sensing of liquid refractive index , 2011 .

[10]  H. V. Thakur,et al.  Photonic crystal fiber injected with Fe3O4 nanofluid for magnetic field detection , 2011 .

[11]  Yunjiang Rao,et al.  Simultaneous measurement of refractive index and temperature using a single ultralong-period fiber grating , 2005 .

[12]  C. Hong,et al.  Optical switch devices using the magnetic fluid thin films , 1999 .

[13]  S. Yam,et al.  Refractive index sensor based on an abrupt taper Michelson interferometer in a single-mode fiber. , 2008, Optics letters.

[14]  Hao Zhang,et al.  Temperature tunability of photonic crystal fiber filled with Fe3O4 nanoparticle fluid , 2011 .

[15]  Xianfeng Chen,et al.  Measurement of the refractive index of a magnetic fluid by the retroreflection on the fiber-optic end face , 2005 .

[16]  Xinwan Li,et al.  Tunable magneto-optical wavelength filter of long-period fiber grating with magnetic fluids , 2007 .

[17]  C. Hong,et al.  Designing optical-fiber modulators by using magnetic fluids. , 2005, Optics letters.

[18]  M. Maiorov.  Faraday effect in magnetic fluids at a frequency 10 GHz , 2002 .

[19]  Ying Cui,et al.  Magneto-optical fiber sensor based on magnetic fluid surrounded tilted fiber Bragg grating , 2012, 2013 6th IEEE/International Conference on Advanced Infocomm Technology (ICAIT).

[20]  Tao Zhu,et al.  A Highly Sensitive Fiber-Optic Refractive Index Sensor Based on an Edge-Written Long-Period Fiber Grating , 2007, IEEE Photonics Technology Letters.

[21]  Xianfeng Chen,et al.  High stability interleaved fibre Michelson interferometer for on-line precision displacement measurements , 2009 .

[22]  Shieh-Yueh Yang,et al.  Origin and applications of magnetically tunable refractive index of magnetic fluid films , 2004 .

[23]  H. Hornga.  Designing the refractive indices by using magnetic fluids , 2003 .

[24]  Libo Yuan,et al.  In-fiber integrated Michelson interferometer. , 2006, Optics letters.

[25]  Jong-Wook Seo,et al.  Design and fabrication of a magnetic microfluidic light modulator using magnetic fluid , 2004 .

[26]  Peng Zu,et al.  Temperature-Insensitive Magnetic Field Sensor Based on Nanoparticle Magnetic Fluid and Photonic Crystal Fiber , 2012, IEEE Photonics Journal.

[27]  Pieter L. Swart,et al.  Long-period grating Michelson refractometric sensor , 2004 .

[28]  E.Y.B. Pun,et al.  Extraction of intrinsic response from S-parameters of laser diodes , 2005, IEEE Photonics Technology Letters.

[29]  Minghong Yang,et al.  Magnetic field sensor based on magnetic fluid clad etched fiber Bragg grating , 2011 .