Super-large-field-of-view push-broom onboard hyperspectral imaging system and imaging method thereof

Abstract

The invention discloses a super-large-field-of-view push-broom onboard hyperspectral imaging system and an imaging method thereof. The system adopts a cascaded optical imaging structure and is composed of a primary concentric spherical lens, a secondary relay image transferring micro lens group and a three-level concentric spectral imaging lens group. A primary system and a three-level system arelocated at the two sides of an aperture diaphragm respectively; the primary concentric spherical lens adopts a four-piece type concentric asymmetric structure; the secondary relay image transferring micro lens group adopts an improved Petzval structure; and the three-level concentric spectral imaging lens group adopts a concentric total reflection structure. The primary system and the secondary system can independently eliminate most geometric aberration, and residual aberration can be further balanced through integral joint optimization; the three-level system is integrated on an optical glass substrate, so that the stability of the system is improved, and the system is suitable for batch production; and the hyperspectral imaging system provided by the invention solves the problem of mutual restriction of the view field and the slit length, realizes super-large view field spectral imaging, and is high in light collection ability, high in stability and excellent in imaging performance.

Description

technical field [0001] The present invention relates to an optical system and its imaging method for fine spectral analysis, in particular to a push-broom airborne hyperspectral imaging system that adopts a cascaded optical imaging structure, is easy to process, has a large field of view, and Imaging method. Background technique [0002] The concept of imaging spectroscopy was first proposed by the US Jet Propulsion Laboratory (JPL). It is a revolutionary leap in the development of remote sensor technology, bringing contemporary spectral remote sensing technology to the forefront. Hyperspectral imaging refers to imaging spectroscopy technology with a spectral resolution reaching the nanometer level. It is a new type of remote sensing technology that began in the early 1980s. It can simultaneously obtain spectral information and two-dimensional spatial information of the target object, and has the advantage of combining maps. It can qualitatively and quantitatively detect t...

AI Technical Summary

Problems solved by technology

Spatial resolution, temporal resolution, and spectral resolution are important performance indicators for hyperspectral imaging systems, and spatial resolution and temporal resolution decrease and increase with the increase of the field of view of the optical system, and are a pair of mutual constraints. The problem is that the current single-lens spectroscopic area-array push-broom hyperspectral imaging system has a small total field of view, generally no more than 40°, a small imaging range, a long repeat imaging cycle, and low temporal resolution, which means that the efficiency of remote sensing operations low cost

Images