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本传感仪可用于低频弱磁场或静态场的测量。本系统利用敷置在光纤上的磁致伸缩材料作为敏感元件,把磁场信号转变为光相位信号,然后采用具有相位补偿的全光纤Mach Zehnder干涉仪将相位调制转换为振幅调制;使用零差检测跟踪相位即可得到被测信号。本系统可探测到的最小场为10~(-9)T/m。
The sensor can be used for low-frequency weak magnetic field or static field measurements. The system uses the magnetostrictive material deposited on the optical fiber as a sensing element, converts the magnetic field signal into an optical phase signal, and then uses an all-fiber Mach Zehnder interferometer with phase compensation to convert the phase modulation to amplitude modulation; uses homodyne detection Tracking phase can be measured signal. This system can detect the minimum field of 10 ~ (-9) T / m.