Magnetic Field and Temperature Measurements With a Magnetic Fluid-Filled Photonic Crystal Fiber Bragg Grating

A novel simultaneous measurement method for magnetic field and temperature is proposed based on the two-resonant peaks photonic crystal fiber Bragg grating (PCFBG) filled magnetic fluid. The measuring principles are introduced in detail and verified by experiments. Sensitivity coefficients were achieved theoretically and experimentally and found to be consistent. The errors of temperature and magnetic field sensitivities were indicated theoretically and experimentally. The measurement resolutions were given. The results show that the scheme is feasible. It solves the cross-sensitivity problem between temperature and magnetic field of the fiber grating sensor, realizes dual-parameter measurement using single fiber that reduces greatly the size of the sensing probe, and provides a new method for the two-parameter measurements.