Optical Design And Stray Light Analysis Of The High Resolution Hyper-spectral Imager Based On LASAS Theory

Spectral imaging is a newly integrated technology,which involved in spectrum analysis and image processing.It has been successfully applied in many fields,such as remote sensing,military reconnaissance,agriculture,disaster monitoring and so on, which leading most concern in recent years.Hyper-spectral imager can image a certain object at different spectrum band.The information of spectral features and surface component can obtained from the "date cube".This paper makes a research on a hyper-spectral imager based on LASIS(Large Aperture Static Imaging Spectrometry) theory,including the following aspects:1.An optical system is designed for the hyper-spectral imager.Firstly,R-C reflection system is selected as the structure of object lens according to its optical characters,such as long focal length,narrow field of view,and wide spectrum.The initial parameter of R-C system is calculated by aberration theory.Two-lens null corrector and an achromat are added for achieving the best result.Secondly,the eyepiece and the Fourier transform lens are designed to minimize the secondary color by the ways of changing glass.Thirdly,the physical dimension of sagnac lateral shearing interferometer is calculated.With a certain example,a graphics method is introduced for solving the geometry size of interferometer.2.The stray light of hyper-spectral imager system is analyzed.At first,the primary baffle,secondary baffle and outer baffle are designed.Secondly,the solid model of the hyper-spectral imager system is constructed in TracePro software,and then the Point Sources Transmittance is calculated at some different off axis angle between 0.5～40 degree.The analysis result shows that the stray light can satisfy the requirement.