【摘要】 研制了一种基于磁流体填充的微腔式马赫-曾德干涉仪(Mach-Zehnder interferometer, MZI)结构的高灵敏的光纤磁场矢量传感器。采用大错位熔接三段单模光纤形成开腔结构，便于将磁流体注入传感器的开腔中，将MZI传感器封装在注有稀释磁流体的玻璃毛细管制成磁场传感器。由于磁流体的折射率会随着施加磁场的变化而改变，MZI的传输光谱会相应发生漂移。通过监测传输光谱的波长漂移，可以检测磁场强度。实验结果表明，具有轴向不对称结构的开腔式MZI传感器具有测量磁场的能力，在3.0～10.0 mT的磁场范围内灵敏度高达-5.51 nm/mT。该MZI磁场传感器由于其灵敏度高、结构紧凑、成本低的优点，适用于磁场测量。更多还原

【Abstract】 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.更多还原