Compact type spectrum imaging method and system used for three-dimensional optical imaging

Abstract

The invention discloses a compact type spectrum imaging method and system used for three-dimensional optical imaging. An imaging beam emitted by a to-be-detected object is converged and imaged to a convex reflection grating through a first concave reflector, and then the imaging beams with different wavelengths are irradiated to a second concave reflector through the light splitting and diverged imaging, the imaging rays with different wavelengths reach an aspheric surface field lens through further converging and imaging; after the field lens corrects the residual aberration, the spectrum images with different wavelengths of the to-be-detected object are converged on a focal plane detector. The imaging system provided by the invention is only composed of three reflecting elements and an aspheric lens, the processing difficulty and the adjustment difficulty of the system are simplified, and the accumulative error produced by adjustment is reduced. The convex reflecting grating is prepared by adopting a holographic record method, the balance and fine correction of the astigmatism and other optical aberration can be realized through joint optimization, the method has the advantages of being uniform in chromatic dispersion, large in relative aperture, high in resolution, good in imaging quality, free from ghost image, compact in structure and convenient to carry.

Description

technical field [0001] The invention relates to a spectral imaging optical system and an imaging method for simultaneously acquiring two-dimensional spatial information and one-dimensional spectral information of an object. Background technique [0002] Spectral imaging technology combines optical imaging technology and spectral technology. It can not only obtain the two-dimensional spatial image information captured by the traditional imaging system of the target object, but also obtain the spectral data information of the target object component analysis by the spectrometer. [0003] With the continuous development of industrial production, biomedicine, and national defense and military applications, there is an urgent need for spectral imaging technology, especially the development of a compact and portable high-performance spectral imaging system. The spectral imaging system needs to introduce a dispersive element into the imaging optical system to realize light splittin...

AI Technical Summary

Problems solved by technology

The use of prism splitting, although it has a high energy utilization rate, its dispersion is nonlinear and uneven, which brings great trouble to the determination of the position of the spectral line on the spectrum surface, and sets up obstacles for the spectral calibration of large data volume

Using grating light splitting, traditional spectral imaging systems generally use planar gratings and concave gratings to split light. Affects imaging performance

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