干涉型光纤Michelson微弱磁场传感器降噪方法研究

Reduction of system noises in fiber optic michelson interferometer

主要研究通过软件解调方法,来抑制干涉型光纤Michelson微弱磁场传感器的噪声。在分析了系统主要噪声基础上,在解调软件中引入自适应谱线增强器(ALE),来最大程度消除宽谱噪声。实验结果表明,该方法可以很好地降低系统本底噪声,使得解调线性度得到加强,最小可重复测量磁场大小为20 nT。

A software demodulation method is developed and used to suppress noise in the fiber-optic Michelson interferometric weak magnetic sensor.Based on the analysis of system noise sources,an adaptive line enhancer（ALE） is introduced into the demodulation software to reduce the wide-band noise.The results show that this method is valid,and it can enhance the demodulation linearity.The minimum detectable magnetic field reaches about 20 nT.