实验环境中主动消磁器的研究与设计

现代凝聚态物理学实验技术向高空间、时间分辨率和高探测灵敏度发展,对环境磁场要求极其严格。主动式消磁器是优化实验室环境磁场的一个重要手段。本文设计了基于亥姆霍兹线圈特性与Labview系统信号处理功能的新型数字式主动式消磁器。该消磁器可以实时补偿实验室内特定频率范围的环境磁场,降低环境磁场对物理实验仪器的影响。实验证明,在不同磁场环境下应用该消磁器消磁后环境磁场可控制在50nT内,达到了电子显微镜等多种凝聚态物理学实验仪器的低磁场环境使用要求。

Study and design of active degausser in experimental environment

To achieve the accurate results,all the experiments in the field of condensed matter have their different technical requirements,such as high spatial or time resolution,high detection sensitivity and lower environmental magnetic field.Active degaussing is an important way to optimize the laboratory surroundings magnetic field.In this paper,a new digital active degausser based on Helmholtz coil and Labview signal processing system is designed.This device can compensate the surroundings magnetic field simultaneously and reach the aim of reducing surroundings magnetic field in the laboratory.It demonstrates that after using the active degausser the surrounding magnetic field can be controlled in the range of 50 nT,which has reached the requirements of most corresponding experiments.