为了实现对磁场信号的高精度检测,利用隧道磁阻式磁传感器,设计并实现了一种精确分辨微弱磁场场信号的锁相放大系统.使用方波调制传感器输出信号,并利用Σ-Δ型ADC实现平均下抽取结构,抑制方波带来的高次谐波干扰,提高了ADC的有效分辨率,降低了系统运算量.通过理论与实验分析,验证了系统可以有效抑制噪声与温漂对测量精度的影响,并可精确标定nT级磁场.

The network topology of power system can be regarded as a non-directed graph. There are mainly two forms of storage structure of graph, including linked list and adjacent matrix. In this paper, a new algorithm which is based on Adjacent Matrix named "Matrix Coloring Method" to analyze the connectivity of graph is proposed. The method is applied in network topology analysis of power system. The example illustrates that the algorithm is efficient and easy to understand.

提出了使用几个具有典型已知响应曲线且经过实验室标定的标准特性单元,到现场对动态信号分析仪进行全自动校准的方法.