A Spectral Imager Based on Planar Grating Spectroscopy

Abstract

The invention discloses a spectrum imager based on plane grating light splitting. The spectrum imager comprises a pre-focusing mirror, a slit-reflection plane grating with a transmission gap, a collimation reflector, an imaging lens and a detector. Light emitted by a target passes through the pre-focusing mirror and is converged at the position of an image plane; the converged light passes through the transmission gap of the slit-reflection plane grating, is reflected back to the slit-reflection plane grating by the collimation reflector, is split by the slit-reflection plane grating, reaches the imaging lens, is converged by the imaging lens, and then is imaged at the detector. By the mixed design of a transmission light path and a reflected light path, the spectrum imager based on plane grating light splitting is compact and small in structure, and integration and weight reduction of the spectrum imager are realized through the integrated design of a slit and a reflecting grating.

Description

technical field [0001] The invention relates to the technical field of spectral imaging, in particular to a spectral imager based on planar grating spectroscopy. Background technique [0002] Spectral imaging technology can obtain the two-dimensional spatial information and one-dimensional spectral information of the target, which can not only realize the image recognition of the target, but also realize the detection of the physical and chemical properties of the target. It is widely used in industrial and agricultural production, geological exploration, environmental monitoring, disaster assessment, urban Planning and other fields have a wide range of applications. Driven by applications, spectral imaging technology has developed rapidly. At present, various types of spectral imaging technologies have appeared and played a role in many fields. [0003] The current spectral imaging technology is mainly based on dispersion spectroscopy, mainly including prism spectroscopy a...

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Problems solved by technology

and figure 1 In comparison, the spectral imager based on the convex grating is very compact in structure, which is conducive to the realization of miniaturization and light weight, but the two mirrors in the system usually use aspheric surface to correct the aberration of the system, so whether it is processing or assembly , it is very difficult to realize, and the development of convex grating is not as mature as that of planar grating

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