光纤弱磁场传感器闭环反馈电路稳定性研究  

The Stability of the Closed-Loop Feedback Circuit for Fiber-Optic Weak Magnetic Field Sensor

作　　者：都智刚[1] 李新碗[1] 王晓扬[1] 汪歆[1] 陈建平[1] 

机构地区：[1]上海交通大学"区域光纤通信网与新型光通信系统"国家重点实验室,上海200240

出　　处：《光纤与电缆及其应用技术》2008年第1期18-20,共3页Optical Fiber & Electric Cable and Their Applications

摘　　要：Michelson干涉型光纤磁场传感器具有极高的灵敏度,因此相应的驱动、控制与检测电路必须具有高度稳定性。采用闭环反馈电路,可使系统从环境大噪声中提取出微弱的信号。研究并设计的闭环反馈电路系统具有非常好的稳定性,能探测到nT量级的微弱磁场,在1 Hz时整个系统只有10μV/Hz的低噪声特性。Fiber-optic magnetic field sensor based on Michelson interferometer is of extremely high sensitivity. Accordingly high stability is required for the driving, control, and detection electronic circuits. By using closed-loop feedback circuit weak signal can be picked up from noisy background; The researched and designed closed-i0op feedback circuit offers very good stability,and can detect weak magnetic field around nano Tesla. The noise level at 1 Hz is less than 10μVλ/Hz^-.

关 键 词：光纤磁场传感器 Michelson干涉仪 闭环反馈电路 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置]