Quarter-wave plate (QWP) is one of the most important components of dynamic interferometer and its retardation can influence the measurement accuracy, which is usually manifested as periodic ripple error in the measurement results. Based on Jones matrix, the error formula is deduced in this paper, and the error correction method by rotating the half-wave plate (HWP) to change the intensity distribution in the four phase-shifted interferograms is proposed. In the experiment, the ripple error can be effectively suppressed when the background intensity of four interferograms tend to be the same. The performance of dynamic interferometer can be significantly improved through the proposed method.

四分之一波片（QWP）是动态干涉仪最重要的组成部分之一，其延迟会影响测量精度，通常表现为测量结果中的周期性纹波误差。本文基于琼斯矩阵推导了误差公式，并提出了通过旋转半波片（HWP）来改变四个相移干涉图中强度分布的误差校正方法。在实验中，当四个干涉图的背景强度趋于相同时，可以有效抑制纹波误差。通过所提出的方法可以显着提高动态干涉仪的性能。