Research On Hyperspectral Imaging Technology

Spectral imaging technology is a novel multi-dimensional imaging technology,which is formed by the combination of optical two-dimensional imaging technology and spectral analysis technology.It can simultaneously detect the spatial and spectral information of the target.Hyperspectral imaging technologyand has been the focus of research at home and abroad.The hyperspectral imaging system consists of a fore optical system and a spectroscopic system.In this paper,the research on hyperspectral imaging technology includes those two parts,which focuses on the Offner hyperspectral imaging system with Féry prism.Based on the study of geometric aberration theory,we study the influence of system structure and parameters of dispersive elements on aberration of hyperspectral spectroscopy system and the influence of material characteristics of dispersive elements on the nonlinearity of spectral line distribution of the system.Then two kinds of Offner hyperspectral spectroscopy systems,with the dispersion elements for single passing and double passing,are designed respectively.And the image quality analysis and thermal stability analysis are completed.Based on the study of basic theory of achromatism and athermalization,we analyze and establish an athermal model of complex transmitted long-focal system.The 1+? method,which is based on the double-lens equivalent model,is proposed to achieve optical athermalization in the visible waveband.The glass in the system was replaced by calculating and analyzing the synthetic weights of the thermal power and chromatic power.According to this method and the pupil matching characteristics of the spectral imaging system,the initial structure design and athermalization of the fore optical system are completed.This method greatly simplifies the athermalization of optical system without using the mechain or optical zoom to compensate image quality,and keeps the optical performance of complex transmitted long-focal system stable in a certain temperature difference environment.According to the application occasions,the design and thermal stability analysis of the hyperspectral imaging optical system are carried out.The hyperspectral imaging optical system designed in this paper has a working band of 400nm~1000nm,a numerical aperture of 0.167 and an average spectral resolution of 4nm.It has 150 spectrual channels,and a fore imaging system whose focal length is 300 mm.The requirement of high image quality and high spectral resolution is achieved in the temperature difference environment of 0?~ +40?.