为保证星载成像光谱仪测量结果的准确性,设计了双巴比涅退偏器。首先利用电磁波理论及光波传输理论分析了双巴比涅退偏器的工作原理,接着根据偏振光在双折射晶体中的传播公式设计出适当的该退偏器的楔角,最后搭建一套偏振测试装置,对研制完成的双巴比涅退偏器的退偏性能进行测试。测试结果表明:该双巴比涅退偏器在-15~15℃入射角范围内具有较好的退偏性能。退偏器楔角选择6°时,能在不影响成像质量的前提下较好地对探测波段退偏,且退偏度不受方位角及频率的影响,退偏度优于99%。该退偏器具有退偏度高、透射比高、性能稳定、体积小等优点。由于测量系统误差,测量不确定度为0.00290。 In order to ensure the accuracy of the measurement results of the spaceborne imaging spectrometer, a double Babinet retarder was designed. Firstly, the operating principle of the double Babbitt depolarizer is analyzed by using electromagnetic wave theory and light wave transmission theory. Then the wedge angle of the depolarizer is designed according to the propagation formula of polarized light in birefringent crystal. Finally, a set of polarization Test device, the debonding performance of the developed double Babinet depolarizer was tested. The test results show that the double barbine depolarizer has good depolarization performance in the incident angle range -15 ~ 15 ℃. When the depolarizer wedge angle is 6 °, the detection band can be degenerated without affecting the imaging quality, and the de-skewness is not affected by the azimuth and the frequency. The de-skewness is better than 99%. The depolarizer has a high degree of de-skewness, high transmittance, stable performance, small size and other advantages. Due to measurement system error, the measurement uncertainty is 0.00290.