摘要
针对相位差检测的过零法和相关分析法,阐述了算法的检测原理,讨论了影响相位差检测精度和快速性的因素.提出了改善精度的技术措施和原则.其中过零点判定为关键技术,当用于信号幅值较大场合时应尽量提高信号采样频率.基于数据采集硬件设备和虚拟仪器软件平台,通过对信号的滤波和去噪处理,实现了相位差的高精度快速测量.相位差检测实验结果表明,提出的方法能快速准确地实现相位差的检测.
Algorithms concerning phase difference measurement, viz, the zero passage method and the relevant function method are brought forward. The principle involved is introduced, and factors influencing the precision and speed of phase difference measurement are discussed. Judgment of the point of zero passage is the key factor involved, and a higher sampling frequency should be adopted when the method is applied on situations of large signal amplitude. Adopting signal filtration and noise weeding, high precision and fast measurement of phase difference is realized, based on the A/D hardware and a LabVIEW virtual instrument platform. Results of experiment show that the two algorithms put forward in this paper are effective in phase difference measurements of high speed and precision.
出处
《北京理工大学学报》
EI
CAS
CSCD
北大核心
2005年第5期435-438,共4页
Transactions of Beijing Institute of Technology
关键词
相位差
功率因数
虚拟仪器
相关分析
phase difference
power factor
virtual instrument
correlation analysis
