Prism-grating-prism imaging system

A prism spectrum and imaging system technology, applied in diffraction gratings, using diffraction elements to generate spectra, optics, etc., can solve the problems of large length and volume, limited imaging quality of spectrometers, and insufficient compactness, etc., to achieve small size, reduce production costs, compact effect

Inactive Publication Date: 2009-03-04
SUZHOU UNIV
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  • Abstract
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Problems solved by technology

In the imaging spectrum system provided by it, the apex angles of the two prisms of the PGP element are different, the diaphragm of the system is placed near the grating, and the collimating objective lens and the imaging objective len

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  • Prism-grating-prism imaging system

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Embodiment 1

[0020] figure 1 It is a schematic structural diagram of a prism-grating-prism spectral imaging system provided by an embodiment of the present invention. See attached figure 1 , 1 is the incident slit; 2 is the collimating objective lens, which is a four-piece structure, in which the second lens from the incident slit has negative refractive power, and the remaining three lenses are positive refractive power; 3 is Prism grating prism (PGP) light-splitting element, 4 is the imaging objective lens, which is completely consistent with the collimating objective lens, and the lenses of the collimating objective lens and the imaging objective lens are axisymmetrically distributed with respect to the PGP light-splitting element; 5 is the image plane, that is, the CCD detector receives surface, which is inclined at 5.32 degrees from the optical axis.

[0021] figure 2 is a schematic diagram of the optical path of the above spectral imaging system. See attached figure 2 , the en...

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Abstract

The invention discloses a prism-grating-prism spectrum imaging system which is integrated with the imaging technology and the light-splitting technology and has the direct vision property. The imaging system is mainly composed of a collimator objective, a prism-grating-prism (PGP) light-splitting element and an imaging objective. The prisms of the PGP light-splitting element are in an axisymmetric distribution, the light incident angle and the light diffraction angle on the grating meet the bragg conditions of grating; the collimator objective and the imaging objective are in a four glass system structure, the object space and the image space meet telecentric optical paths, and the surface of a receiver has mean illunication. The system has the advantages of higher light energy transmission, favorable imaging quality, direct vision, small volume, easy carrying, high spectral resolution and easy processing, assembly and adjustment. All the lenses or prisms are made of common domestic common glass, so the mass production cost is reduced. The imaging system can be used in the spectral cameras in the field of biomedicine, and also can be made into a civil hyper-spectral imaging system such as a pen type spectroscope and the like.

Description

technical field [0001] The invention relates to a spectral imaging system integrating imaging and spectroscopic technology, in particular to a spectral imaging system with direct vision. Background technique [0002] Imaging spectrometer combines the two long-established technologies of optical imaging and spectral spectroscopy, so that it can simultaneously obtain the spatial image of the object and rich spectral information, and has the advantage of integrating the spectrum. Since the 1980s, it has been paid great attention by scientific research institutions in various countries, and has been widely used in land, atmosphere, ocean and other observations on aviation and spacecraft. [0003] Spectroscopic technology mainly includes optical filters, prisms, binary optical elements, interference spectroscopic and other methods, among which prism or grating spectroscopic is a traditional and relatively mature spectroscopic method. In traditional prism or grating spectrometers...

Claims

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Application Information

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IPC IPC(8): G02B27/00G02B27/10G02B5/18G01J3/18
Inventor 沈为民朱善兵
Owner SUZHOU UNIV
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