基于MCS-51单片机的高精度数字测相方法

Method of High Accuracy Phase Measurement Based on the MCS-51 Single-chip Computer

相位是周期信号的一种重要的波形参数.利用MCS-51单片机与外部电路相结合,充分利用其片内资源,采用过零鉴相法,高频脉冲填充计数,多周期等精度测量方法,实现了相位差的高精度测量.着重介绍了系统原理及硬软件实现方法.

Phase is a kind of important wave parameter of periodical signal. Making use of the combination of MCS-51 single-chip computer and external circuit and using its fiat resource fully, this paper has realized the high accuracy measure of phase difference by using the precision measurement technique such as over zero appraisal phase method, fill count by the pulse of high frequency and multiperiods etc. It also introducs systematic principle and the realization method of hardware and software emphatically.