磁感应强度基准装置是弱磁计量的核心系统，是衡量一个国家磁计量水平的重要标志之一。影响该装置性能的一个重要指标是在地球磁场环境下提供一个稳恒磁场。目前主要采用光泵等总场传感器进行总场稳场，在稳场机理方面存在一定的不足。超导量子干涉器件（SQUID）是目前最为灵敏的探测器件，其低噪声、高带宽及矢量探测特性有望为磁感应强度基准装置提供一个性能更加优越的稳态磁场。对此，本课题拟开展基于低温超导SQUID三轴磁强计的矢量稳场及其机理研究。通过研究SQUID噪声特性， SQUID矢量稳场影响因素，以及矢量稳场和总场稳场的机理等，阐明SQUID矢量稳场优越性机理。为新一代磁感应强度基准装置的实用化应用奠定理论和实验基础。

The magnetic induction intensity reference device is the core system of a weak magnetic measurement and is one of the important marks to measure the magnetic field metrology of a country. An important performance index of this system is to provide a ultra-stable magnetic field in the earth’s magnetic field(EMF). At present, it mainly adopts optical pump magnetometer and other scalar magnetic field sensors for field stabilization. The superconducting quantum interference device (SQUID) is the most sensitive magnetic field detector at present. Its low noise, high bandwidth and vector detection characteristics are expected to provide a superior steady magnetic field for magnetic induction intensity reference device. In this project, the vector stability field based on SQUID triaxial magnetometer and its mechanism are studied. By studying the noise characteristics of SQUID, the factors affecting the vector stability field of SQUID, and the different mechanism between the vector field stabilization and scalar field stabilization, the superiority mechanism of SQUID vector stabilization is expounded. It lays the theoretical and experimental foundation for the practical application of a new generation magnetic induction strength reference device.