Research Of Magnetic Field And Temperature Sensing Based On Different Filling Patterns In Photonic Crystal Fiber

The photonic crystal fiber(PCF) with its unique characteristics and advantages over conventional optical fibers, PCF has been applied in many fields in recent years. In the actual detection of magnetic field, the influence of the ambient temperature is generally considered.Using the unique advantage on measuring the magnetic field, the research of the magnetic field and temperature sensing in PCF based on photonic bandgap and directional resonance coupling effect have great scientific and wide applied in future.Magnetic liquid is filled in a plurality of air hole as the photonic bandgap effect to realize the magnetic field and temperature measurement. The bandgap is calculated with the full vector plane wave expansion method and the result shows that the boundary and width of bandgap drift regularly with the variation of temperature. The magnetic fluid is filled in the cladding air holes by different location, when the inner air hole only filled, the variation of the bandgap is the maximum. It’s show that the magnetic field、temperature sensitivity can be 1.872nm/Oe、6.418nm/°C and 0.595nm/Oe�'� 2.038nm/°C using the band-gap edge wavelength detection mechanism and band-gap width detection mechanism respectively, when the magnetic fluid is only filled in the inner air hole with the lattice period ? ?9?mand air-filling ratio d/ ? ?0.9 or d/ ? ?0.5.Follow, magnetic liquid is filled in an air hole as the directional coupling channel to realize the magnetic field and temperature measurement. The characteristics of the sensor are studied numerically by using a full vector finite element method(FEM). The results show that the magnetic field sensitivities reach 1.1nm/Oe when magnetic field in the range of 100~250 Oe and temperature sensitivities reach 3.857nm/°C when temperature is in the range of 10°C ~60°C.In this paper, some basic research has been done into the field of the multi parameter sensing with magnetic field solved by fiber optics, it will have potential application significance of remote monitoring in the field of satellite magnetic control system and power line transmission.