Research On Snapshot Imaging Spectral Technologies Base On Micro-lens Array

Because of its superior information acquisition ability of spatial-spectra3D datacube,Spectral imaging technology has been widely used in various fields andbecome a powerful means of optical detection method.snapshot imagingspectroscopy, as for it can acquire information for restoration of spatial-spectral3D data cube in a shutter time, has become a hot topic worldwide.This paper researchs the snapshot imaging spectrometer technology, as a snapshotinterferometric imaging spectroscopy is developed from the tradition interferenceimaging spectrometer technology, this paper analyzes the basic principle ofinterference imaging spectrometer technology and introduced the polarizationinterference imaging spectrometer technology. On this basis, this paper analyse theparameters design process of the snapshot imaging spectrometer with thecombination of microlens array and Wollaston prism,and give the calculations ofthe parameters, Then designed and built a snapshot imaging spectrometer based ona single Wollaston prism. In order to obtain the vertical surface of interferencefringes, this paper analyzes the optical path distribution of the double Nomarskiprism, and done the simulation. Spectral recovery must be done after obtaining thetarget’s interferogram, this paper analyzes the key technologies of spectrumrecovery, and proposes the specific solutions for the problem that may arise in thespectral recovery of the interference of the snapshot imaging spectrometer basedon microlens array: for there is a deviation problem of the interferogra array, aimage registration method based on a templates is proposed; for there is opticalpath difference problem caused by non-uniform sampling, the optical pathdifference correction method is proposed. According to the analysis, this paperdesigned the procedures of interferogram extraction, image arrays registration,optical path difference correction,apodization and phase correction.Finally, by means of experiments,this paper done the spectrum calibration usingnine narrowband filter and get a spectral resolution better than11nm (at632.8nm),and verify the correctness of the system through the filter array and colorimage imaging experiments.