Linearity gradual change optical filter type multispectral imaging instrument based on secondary imaging

Abstract

The invention discloses a linearity gradual change optical filter type multispectral imaging instrument based on secondary imaging. The imaging instrument comprises a front imaging system, a linearity gradual change optical filter, an Offner relay imaging system and a detector which are successively arranged. The front imaging system realizes a function of imaging an object, the linearity gradual change optical filter is arranged on a primary image plane of the front imaging system and realizes spectrum segmentation of a space object, the Offner relay imaging system reimages the primary image plane after the spectrum segmentation on the detector, and the detector obtains and records digital information through a photoelectric effect, wherein the distance between the linearity gradual change optical filter and the front imaging system and the distance between the linearity gradual change optical filter and the Offner relay imaging system are not smaller than a predetermined value. By employing the multispectral imaging instrument disclosed by the invention, the influence of spectrum aliasing on spectrum resolution can be completely eliminated, and at the same time, ghost images are prevented from formation.

Description

technical field [0001] The invention relates to the technical field of spectral imagers, in particular to a linear gradient filter type multispectral imager based on secondary imaging. Background technique [0002] Spectral imaging technology is widely used in various fields such as resource exploration, environmental and disaster monitoring, and criminal evidence identification because it can simultaneously obtain the spatial image and spectral information of the target. Spectral imaging technology can be divided into prism spectroscopic type, filter spectroscopic type, grating spectroscopic type and interference type according to different spectroscopic methods. Prism and grating dispersive spectral imagers appeared earlier, and the technology is the most mature. Most spectral imagers use this kind of spectroscopic technology. Interferometric spectral imaging detection technology is to add an interferometer in the optical path, such as Michelson interferometer or Sagnac (...

AI Technical Summary

Problems solved by technology

However, its disadvantage is that the distance between the filter and the detector has a great influence on the spectral resolution, and the phenomenon of spectral aliasing is very serious; in addition, the light is easy to interfere between the filter and the detector Phenomenon, also can cause ghost images at the same time

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