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为了提高改型超广角Sagnac成像干涉仪的成像质量,研究其调制传递函数(MTF)fMTF。计算出改型Sagnac成像干涉仪入射光线的5个边界条件后,给出其光瞳函数。根据傅里叶变换,得到改型Sagnac成像干涉仪的调制传递函数的表达式。根据前期研究所优化出来的改型Sagnac成像干涉仪的相关参数,绘制出MTF曲线,得到奈奎斯特频率处的fMTF=0.62。而上层大气风场探测的风成像干涉仪(WINDII)中的迈克耳孙成像干涉仪的fMTF=0.35,说明改型Sagnac成像干涉仪的成像质量更好。
In order to improve the imaging quality of the modified super-wide-angle Sagnac imaging interferometer, the modulation transfer function (MTF) fMTF was studied. After calculating the five boundary conditions of the incident Sagnac imaging interferometer, the pupil function is given. According to the Fourier transform, the expression of the modulation transfer function of the modified Sagnac imaging interferometer is obtained. According to the parameters of the modified Sagnac imaging interferometer optimized by previous research, the MTF curve was drawn, and the fMTF = 0.62 at the Nyquist frequency was obtained. The fMTF of the Michelson imaging interferometer in the WindII interferometer (WINDII) detected by the upper atmospheric wind field shows that the imaging quality of the modified Sagnac imaging interferometer is better.