Fiber magnetic field vector sensor based on magnetic fluid filled microcavity structure
The highly sensitive fiber magnetic field vector sensor is proposed based on a micorcavity Mach-Zehnder interferometer(MZI)filled with magnetic fluid.By using offset fusion splicing to form the cavity structure,magnetic fluid can be easily injected into the cavity,and then the MZI sensor is encapsulated in a glass capillary tube filled with diluted magnetic fluid.As the refractive index of the magnetic fluid changes with the applied magnetic field,the transmission spectrum of the MZI will shift accordingly.By monitoring the wavelength shift of the transmission spectrum,we can detect the magnetic field strength.Experimental results show that the cavity MZI with an axially asymmetric structure has the capability to measure magnetic field,achieving a high sensitivity of-5.51 nm/mT in the magnetic field range of 3.0～10.0 mT.The proposed MZI magnetic field sensor,with its high sensitivity,compact structure,low cost,can be used in various magnetic field measurement applications.
fiber sensormagnetic field sensorMach-Zehnder interferometermagnetic fluidvector sensor
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维普
