非偏振分光棱镜在干涉仪中引入的非线性误差将对仪器的测量精度产生不可忽视的影响，所以测量非偏振分光棱镜所引入的相移特性并探究其补偿方法是非常有意义的。基于琼斯矩阵描述偏振态的方法，设计、搭建了非偏振分光棱镜透射及反射相移的测量系统，并对反射相移进行了有效补偿，此外，还对相移的温度特性进行了实验探究。系统采用双光电探测器平衡探测的方法可以消除光源功率抖动的影响，具有探测精度高、稳定性好、抗干扰能力强等优点。研究结果表明：非偏振分光棱镜的反射相移明显大于透射相移，将2个反射相移接近的非偏振分光棱镜进行组合后整体相移明显降低。此外，随着温度的变化，相移也会发生变化，相移的温度特性曲线中存在相移量最小的拐点，该方法有助于寻找非偏振分光棱镜的最佳工作温度。

Non-linear errors introduced by a non-polarized beam splitter considerably impact the measurement accuracy of an interferometer. Therefore, it is necessary to measure phase shift characteristics introduced by the non-polarized beam splitter and explore the compensation method of the non-polarized beam splitter. Based on the Jones matrix method describing polarization states, we set up a measurement system for the transmission and reflection phase shifts of the non-polarized beam splitter and the effective compensation of the reflection phase shifts. In addition, the temperature characteristics of the phase shifts are experimentally investigated. The aforementioned system uses the balanced detection method of dual photo-detectors; this method exhibits high detection accuracy, good stability, and anti-interference and can also eliminate the fluctuation in light power. The results show that the reflection phase shift of the non-polarized beam splitter is larger than the transmission phase shift, and the overall phase shift is effectively reduced by combining two non-polarized beam splitters with almost the same reflection phase shifts. Moreover, the phase shift changes with a change in temperature. An inflection point of the minimum phase shift in the temperature characteristic curve is observed, which helps determine the optimal operating temperature of the non-polarized beam splitter.