【摘要】 采用琼斯矩阵法分析了法拉第旋转镜消除偏振诱导信号衰落的原理,阐述了基于磁致伸缩的光纤迈克耳孙干涉型磁场传感器基本原理。利用闭环控制工作点的方法,稳定了磁场传感器系统的工作点,然后对该系统进行了检测。结果表明,磁场传感器系统具有良好的稳定性,当外界磁场较小时,输出与外界磁场大小呈线性关系,在幅度为4000nT的交流磁场调制下,相位灵敏度可达1．4×10-3rad／nT,最小可测磁场达0．57nT。更多还原

【Abstract】 The principle that Faraday rotator mirror eliminates polarization-induced fading was analyzed by means of Jones matrix. And the basic principle of the sensor was described. Using work point controled by closed loop, the work point of system was stabled, and then the experiment had been done on the system. Esperimental results show that the sensor output was stable. With a AC bias magnetic field of amplitude of 4000nT, the magnetic sensor phase sensitivity can reach 1.4×10-3 rad/nT, and the minimum detectable magnetic field is 0.57nT.更多还原