title: Compact magnetic-field sensor based on optical microfiber Michelson interferometer and Fe3O4 nanofluid.
abstract: 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.
authors: Key Laboratory of Optoelectronic Technology and Systems (Education Ministry of China), Chongqing University, Chongqing, China. dengming@cqu.edu.cn
authors: Ming
authors: M
authors: Deng
authors: Xiaokang
authors: X
authors: Sun
authors: Meng
authors: M
authors: Han
authors: Decai
authors: D
authors: Li