改型Sagnac成像干涉仪的调制传递函数研究  

Modulation Transfer Function of Modified Sagnac Imaging Interferometer

作　　者：唐远河[1] 郭挺[1] 郜海阳[1] 

机构地区：[1]西安理工大学理学院,陕西西安710048

出　　处：《光学学报》2010年第6期1651-1655,共5页Acta Optica Sinica

基　　金：国家自然科学基金(10874138);陕西省教育厅科学研究计划项目(09JK653);西安理工大学联合基金(108-210920)资助课题

摘　　要：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 modified super-widen-angle Sagnac imaging interferometer（SASI）,the modulation transfer function（MTF）fMTF is investigated.After calculating the five boundary conditions of incident ray of the modified SASI,its pupil function is given.Then,the expression of MTF of the modified SASI is deduced according to Fourier transform.Using the relevant parameters of optimized SASI,the curve of MTF is drawn and the result is fMTF=0.62 at Nyquist frequency.But the fMTF of WINDII（Michelson imaging interferometer）which is used to measure the upper atmosphere wind field is 0.35.It shows that the SASI has a better imaging quality than WINDII.

关 键 词：光学成像 光瞳函数 调制传递函数 改型Sagnac成像干涉仪 

分 类 号：O438.2[机械工程—光学工程]