一种检测弱磁场的光纤传感器的研究与仿真  

Research and simulation of fiber sensor for weak magnetic field detection

作　　者：赵欣瑜 江兴方[1] 阮志强 张磊[1] ZHAO Xinyu;JIANG Xingfang;RUAN Zhiqiang;ZHANG Lei(School of Microelectronics and Control Engineering,Changzhou University,Changzhou,Jiangsu 213164,China)

机构地区：[1]常州大学微电子与控制工程学院,江苏常州213164

出　　处：《应用光学》2024年第4期873-878,共6页Journal of Applied Optics

基　　金：国家自然科学基金(41875026);江苏省现代光学技术重点实验室开放研究课题(KJS1405)。

摘　　要：提出一种基于表面等离子共振的光子晶体光纤传感器,用于实时检测弱磁场强度变化。光子晶体光纤表面覆盖氮化硅和银薄膜,实现表面等离子共振,传感器外侧的磁流体用于感知磁场变化。针对磁场强度检测,基于折射率性能指标归纳了磁场与传感器性能指标。有限元方法的仿真结果表明,在80 Oe~1000 Oe磁场强度范围内,传感器波长灵敏度可达0.55 nm·Oe^(-1);此外,幅度灵敏度、分辨力、检测限、品质因数和拟合度分别达到了-0.107 Oe^(-1)、1.8×10^(-2)Oe、3.3×10^(-2)Oe~2·nm^(-1)、6.73×10^(-2)Oe^(-1)和0.99117。该传感器具备制作工艺简单、易于制造的特点,可以预见其在磁场检测的广阔前景。A photonic crystal fiber sensor based on surface plasmon resonance was proposed for real-time detection of weak magnetic field.The surface of the photonic crystal fiber was covered with silicon nitride and silver film to achieve surface plasmon resonance,and the magnetic fluid on the outside of the sensor was used to sense the magnetic field changes.For the detection of magnetic field intensity,the performance indexes of magnetic field and sensor were summarized based on the performance indexes of refractivity.The simulation results of finite element method show that the wavelength sensitivity of the sensor can reach 0.55 nm∙Oe-1 in the magnetic field range of 80 Oe~1000 Oe.The amplitude sensitivity,resolution,limit of detection,quality factor and fitting degree reach-0.107 Oe^(-1),1.8×10^(-2)Oe,3.3×10^(-2)Oe2∙nm^(-1),6.73×10^(-2)Oe^(-1)and 0.99117,respectively.The sensor also has the characteristics of simple production process and easy to manufacture,which can foresee its broad prospect in magnetic field detection.

关 键 词：传感器 光子晶体光纤 表面等离子共振 磁场检测 有限元方法 

分 类 号：TP212.3[自动化与计算机技术—检测技术与自动化装置]