Compact double-branch PGP imaging spectrometer
An imaging spectrometer and double-branch technology, applied in the field of imaging spectroscopy, can solve the problems of excessive size, inconvenient installation and use, etc., and achieve the effects of reduced length, compact structure, and high diffraction efficiency
Inactive Publication Date: 2021-05-04
CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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Problems solved by technology
[0005] The present invention provides a compact double-branch PGP imaging spectrometer to solve the problems that the size of the existing PGP spectrometer is too long in the optical axis direction, and the installation and use are inconvenient.
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[0014] combine figure 1 and figure 2 Description of this embodiment, a compact dual-branch PGP imaging spectrometer, including a slit 1, a folding mirror a2, a folding mirror b3, a collimating mirror a4, a collimating mirror b5, a prism-grating-prism (PGP) 6, focusing mirror a7, focusing mirror b8, turning mirror c9, turning mirror d10, camera 11 and lens barrel 12. The incident polychromatic light is divided into two parts by the folding mirror 2 after passing through the slit 1, and enters the upper and lower branches respectively.
[0015] The polychromatic light entering the upper branch is collimated into parallel light by the collimating mirror a4 and then divided into multiple beams of monochromatic light arranged in order of wavelength by the PGP 6, and the monochromatic light of different colors is converged at On the camera 11, the spectrum corresponding to the target in the upper half of the slit is obtained;
[0016] The polychromatic light entering the lower b...
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The invention discloses a compact double-branch PGP imaging spectrometer, relates to the technical field of imaging spectrums, and solves the problem that the size of an existing PGP imaging spectrometer in the optical axis direction is too large. A slit, a reflex lens group, a focus lens a, a focus lens b, a reflex lens c, a reflex lens d, a camera and a lens barrel are included. Incident polychromatic light is divided into an upper branch and a lower branch by the reflex lenses after passing through the slit. The polychromatic light of the two branches is collimated into parallel light through a collimating lens and then is divided into monochromatic light through the same PGP light splitting element, and the monochromatic light is converged on the camera through the focus lens so that the spectrum of a target is obtained. According to the invention, the collimation pressure of each branch collimating lens is reduced in a slit halving manner so that the focal lengths of the collimating lens and the focus lens are reduced, and the axial length of the PGP spectrometer is decreased; and meanwhile, the PGP and the camera are shared by the two branches so that the distance between axes of the two branches is reduced, and the imaging spectrometer is more compact. The length of the PGP imaging spectrometer in the direction of the optical axis can be greatly reduced, and the characteristics of high diffraction efficiency and direct view of the optical axis are possessed.
Description
technical field [0001] The invention relates to the technical field of imaging spectroscopy, in particular to a compact double-branch PGP imaging spectrometer. Background technique [0002] Based on the spectral analysis theory of matter, spectral imaging technology combines spectral and imaging technology to obtain spatial information, radiation information and continuous spectral information of dozens or hundreds of bands of ground objects. Based on spectral imaging technology, hyperspectral imaging spectrometer realizes comprehensive detection, perception and recognition of target characteristics, greatly expands the target recognition and monitoring capabilities of remote sensing detection technology, and is widely used in resource detection, environmental monitoring, criminal identification, etc. various fields. [0003] PGP spectrometer is a new type of imaging spectrometer, which inherits the characteristics of strong spectral resolution and linear dispersion of grat...
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Login to View More IPC IPC(8): G01J3/28G01J3/16G01J3/18
CPCG01J3/16G01J3/18G01J3/2823G01J2003/1208
Inventor 刘春雨樊星皓谢运强刘帅张玉鑫
Owner CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI