了解单频激光干涉仪的非线性误差，使用matlab软件工具对提出的非线性误差修正方法进行验证，对干涉信号中的直流分量偏差对测量的影响进行分析。-Learn nonlinearity error single frequency laser interferometer using matlab software tools for the proposed non-linear error correction method for verification of the DC component