一种基于残周期正弦波拟合的相位差测量方法

The Phase Difference Evaluation Based on Total Least-square Method with Partial Period Sinusoidal Waveforms

针对不足一个波形周期的相位差测量,提出使用残周期正弦波拟合算法实现的技术方法,给出了原理和实现过程。针对该条件下相位差的测量不确定度,给出了使用波形局域失真和噪声信号比方式,以实际估计参数条件下的仿真计算进行评估的模式。最后,使用激光测振仪校准中的三个相位之间的相位差进行了实验验证,结果表明,在约0.5个周期条件下获得的相位差与多周期条件下的相位差仅仅相差1°左右,证明了该方法的有效性和可行性,为正弦相位差测量提供了一种新的实现方式。

Aiming at the phase measurement problems of partial period sine wave, a novel phase difference measurement method is introduced. By using the sinusoidal curve-fit method with partial wave period, the phase difference can be attained. The courses and principles are presented in detail. Through local distortion and noise to signal ratio, and using the simulation in the condition of real measurement parameter, the measurement uncertainty of phase difference can be estimated. Finally, in the calibration of Laser Doppler Velocimeter, a comparative experiment is executed, the result shows that, in about 0.5 period sinusoidal waveform, one can get excellent phase difference in deed, the deviation between partial period and multi periods signals is only about 1°. The validity and feasibility are proved, and it must be a novel phase difference measurement method.