In practice there are three methods of accomplishing this phase difference. 在实践中有三种方法来获得相位差。
A frequency tracking method is proposed.The synchronism sampling is achieved to improve the measuring precision of frequency and phase difference. 本文提出一种频率跟踪方法,可以在不过零开始采样的情况下,实现整周期采样,保证频率和相位差测量的精度。
The phase difference between the two sources is gradually drifting with time. 两个源的位相差随时间逐渐移动。
Compare with the results obtained from the experiment, isotherm and the rule of phase interface moving obtained from the simulation are almost the same. 和实验结果相比,通过数值模拟得出的等温线和界面移动规律形状都与实际情况相差不大。