基于磁流体的温度磁场测量技术研究进展

Research Progress of Temperature and Magnetic Field Dual-Parameter Measurement Technology Based on Magnetic Fluids

磁流体的固体磁性和液体流动性在温度与磁场传感领域有很大的应用潜力。将磁流体和光纤传感结构结合,将外界温度与磁场的信息调制于传输光波上,通过解调特征光谱的参量,实现温度与磁场的传感。综述了基于磁流体的温度与磁场传感器的研究进展,从磁流体与传感结构不同结合方式的角度,介绍了基于模式干涉、倏逝波、光纤光栅、光纤环镜、光子晶体光纤、表面等离子体、法布里-珀罗(FP)干涉的温度与磁场传感器。分析比较各传感结构的传感原理、灵敏度,展望未来的发展趋势。其中,磁流体填充特种光纤的温度与磁场传感器具有较高的灵敏度,结构稳固,抗干扰性强。

The magnetic properties and fluidity of a magnetic fluid have great potential applications in the field of temperature and magnetic field sensing.The combination of a magnetic fluid and an optical fiber sensing structure can modulate the light wave according to the changes in external temperature and magnetic field and obtain the sensing variation of temperature and magnetic field by demodulating the parameters of the characteristic spectra.This review summarizes the research progress of temperature and magnetic field sensors based on magnetic fluids according to different combinations of magnetic fluids and sensing structures.Furthermore,it introduces the temperature and magnetic field sensors based on mode interference,evanescent wave,fiber grating,fiber ring mirror,photonic crystal fiber,surface plasma,and Fabry-Perot interference.This review analyzes the sensing principle and sensitivity of each sensing structure and presents the future development trend.The temperature and magnetic field sensor with special fiber filled by magnetic fluid is shown to have a high sensitivity,a stable structure,and a strong anti-interference ability.