Magnetic field sensing based on magneto-volume variation of magnetic fluids investigated by air-gap Fabry- Perot fiber interferometers

作者：Dong, Shaohua; Pu, Shengli^*; Huang, Juan

来源：Applied Physics Letters, 2013, 103(11): 111907.

DOI：10.1063/1.4821104

• MICROSTRUCTURED OPTICAL-FIBER
• PHOTONIC CRYSTAL FIBERS
• REFRACTIVE-INDEX
• HIGH-TEMPERATURE
• SENSOR
• FERROFLUIDS
• RELAXATION
• TRANSMISSION
• STRAIN
• FE3O4

A compact air-gap Fabry-Perot fiber interferometer using magnetic fluids as the constituent material is constructed. The proposed structure possesses high sensitivity to magnetic field and is eligible for probing the tiny magnetic-field-induced volume variation of magnetic fluids. The underlying physical mechanisms for the magneto-volume variation are clarified in detail. The shift of the interference spectrum with magnetic field is employed for the magnetic field sensing applications. The highest sensitivity of magnetic field sensing for our experimental structure can reach 117.3 pm/mT when the sensing head is set at 45 degrees azimuthal angle (with respect to the magnetic field direction).

• 出版日期2013-9-9
• 单位上海理工大学