摘要
光纤测磁传感仪根据Ｍａｃｈ－Ｚｅｈｎｄｅｒ干涉仪原理制作，适用于测量静态弱磁场。传感仪的传感臂和参考臂由两条单模光纤组成，传感臂的光纤上粘合了一段磁滞伸缩材料作为传感头．当被测静态场与交变的偏置场共同作用于传感头时，磁滞伸缩材料所产生的纵向应变将导致光纤中的光相位发生变化，利用相位探测装置和锁相放大器就可得出被测场的大小。本系统可探测的最小静态场为７９．５７×１０Ｅ－７（Ａ／ｍ）。
According to the Mach-Zehnder interferometer,a fiber optic magnetometer for detecting DC magnetic fields includes a first optical fiber having a magnetostrictive jacket thereon which defines a sensing arm, and a second fiber defining a reference arm. This induces a corresponding phase shift in light transmitted through the sensing arm fiber. The phase detection device and the lock-in amplifier will produce a signal proportional to the DC magnetic field. The minimum detectable field is 79.57×10E-7(A/m).
出处
《传感器技术》
CSCD
1995年第3期50-53,共4页
Journal of Transducer Technology
关键词
光纤
传感器
磁场
磁滞伸缩
Fiber optic
Sensor
Magnetic field
Magnetostrictive
