一种分布式多通道微弱电流采集系统的设计

Design of a Distributed System for Multi-Channel Weak Signal Collection

针对多种应用环境下微弱电流信号采集的特殊性,介绍了一种分布式多通道微弱电流采集系统,基于"以数据为中心"的分布式结构,将系统逻辑分层为电流采集节点、数据存储与处理节点及人机界面等功能模块。其中,电流采集节点采用单片智能结构,易于实现信号的本地数字化及传输;数据存储与处理节点负责各采集节点数据流的收集、处理及封装。针对多节点电流数据处理的实时性要求,采用数字相敏检波技术实现了对微弱信号的快速有效处理。

In allusion to the particularity of various application environments for weak signal acquisition,a distributed multi-channel weak current acquisition system is designed.Based on ＂data-centric＂ distributed architecture,the system is divided into three modules with logic and physical,such as current collection node,data storage and processing nodes and the man-machine interface.Among them,the current collection node using monolithic smart structure,being easy to implement a local digital and transmission,data storage and processing node is responsible for collecting data flow in the collection node,processing and packaging.For the real-time requirements,digital phase sensitive detection technology is applied to achieve fast and efficient processing of weak signals.