取样式数据采集新方法

A New Method for Sampled Data Acquisition

针对传统的取样式数据采集方案存在的缺点 ,提出一种利用锁相环实现取样式数据采集的新方法。通过锁相环对输入信号频率变换 ,获得一个步进延迟的关联信号 ,在关联信号的同一相位点对输入信号采样 ,其等效采样次数及实际采样间隔由微机编程控制。基于此原理设计出高频周期信号的数据采集系统。该数据采集系统具有等效采样次数及实际采样间隔设置灵活、工作稳定、输入信号频率范围宽等优点。

To aim at the defect of traditional sampled data acquisition scheme, a new method of realizing sampled data acquisition by phase locked loop is presented. By pll frequency transformation for input signal, a relative signal of stepping delay is obtained. At same phase time of the relative signal, input signal is sampled. The equivalent sampling numbers and actual sampling interval of the input signal is controlled by a microcomputer program. Based on this principle, a data acquisition system of high frequency and period signal is designed. The data acquisition system possesses the advantage of equivalent sampling numbers and actual sampling interval place to be agile, steady work, wide frequency extent of the input signal, ect.\;