Study Of Spectral Imaging System Based On Filter

As a instrument, imaging spectrometer combines optical imaging and imaging spectroscopy. It has been widely used in the fields such as ground survey, military camouflage, natural disaster warning and medical treatment. It is an important part of optical detection technology.The imaging spectrometer has the advantages of compact, simple structure and calibration easily, but the conventional Linear Various Filter spectral imaging system has a shortcoming of spectrum aliasing, which seriously affects the detection accuracy. Firstly, the overview of imaging spectrometer, the classification and the research status at home and abroad are introduced, and what`s more the main points of the optical spectrum imaging system are described. And the LVF spectral imaging technology is studied deeply. As follows:(1) The factors affecting the accuracy of the imaging spectrometer are analyzed,and a new structure is proposed to reduce the spectrum aliasing and improve the resolution.(2) A wide spectrum scanning LVF imaging objective lens with 600 nm ~ 1100 LVF is designed, and the total length is less than 85 mm, the distortion is less than0.01%, and MTF of full field view is better than 0.7, and the spatial resolution is1.02’.(3) On the basis of the imaging objective lens, the technical parameters of the relay system are determined by taking into account the principle of aperture and fieldof view. Tolerance distribution and system transmission rate are calculated.(4) According to the existing conditions of the laboratory, select relay mirror,linear various filter and detector to set up the experimental platform, the spectral calibration has been done, tested the spectral resolution and spatial resolution. And finally a fruit maturity test experiments has been done, which confirmed that this system can be applied to automated fruit maturity detection.This paper studies the design of the LVF imaging spectrometer system has an advantage of accurate, small. Compared with the others, the LVF multi spectral imaging spectrometer has higher spatial and spectral resolution.