Optical device for wide waveband plane grating dispersion type imaging spectrometer

A technology of imaging spectrometer and planar grating, which is applied in the field of imaging spectrometer, can solve the problems of large residual aberration and large astigmatism, and achieve the effects of wide spectral range, cost reduction and good imaging quality

Inactive Publication Date: 2011-06-29
CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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Problems solved by technology

[0003] In order to solve the problem that the existing planar grating spectrometer only corrects the aberration for the center wavelength and has relatively large residual aberratio

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  • Optical device for wide waveband plane grating dispersion type imaging spectrometer
  • Optical device for wide waveband plane grating dispersion type imaging spectrometer
  • Optical device for wide waveband plane grating dispersion type imaging spectrometer

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Example Embodiment

[0011] Specific implementation mode one, combination figure 1 with figure 2 In this embodiment, the optical device of a wide-band plane grating dispersive imaging spectrometer is described. The device includes a front optical system and a Czerny-Turner spectral imaging system, and the front optical system includes an aperture stop 1 and an off-axis parabolic mirror 2; The Czerny-Turner spectral imaging system is composed of an entrance slit 3, a spherical collimator 4, a plane grating, a plane mirror, a toroidal focusing mirror, and an area array focal plane detector; the entrance slit 3 is located by the aperture stop On the focal plane of the front optical system composed of 1 and off-axis parabolic mirror 2, the light exiting through the incident slit 3 is projected onto the spherical collimator 4, collimated by the spherical collimator 4, and then projected onto the plane grating 5 , The diffracted light emitted from the plane grating 5 is deflected by the plane mirror 6 an...

Example Embodiment

[0012] Specific implementation mode two, combination figure 2 with image 3 As shown, this embodiment is an example of the optical device of the wide-band planar grating dispersive imaging spectrometer described in the first embodiment, including a front optical system composed of an aperture stop 1 and an off-axis parabolic mirror 2 and an A spectral imaging system composed of slit 3, spherical collimator 4, plane grating 5, plane mirror 6, toroidal focusing mirror 7 and area array focal plane detector 8.

[0013] The device of the invention is mounted on a satellite platform to detect ground targets, and the working waveband is 350nm-750nm. Combining 3, the X direction is the cross-orbit direction, which is the length of the incident slit 3, the Y direction is the satellite travel direction, which is the width of the incident slit 3, and the Z direction is the height of the satellite; the X direction corresponds to the ground width 25km, the satellite orbit height is 800km.

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Abstract

The invention provides an optical device for a wide waveband plane grating dispersion type imaging spectrometer, and relates to the technical field of imaging spectrometers in the earth observation field. The optical device solves the defects of the conventional plane grating spectrometer that only the aberration of center wavelength is corrected, the residual aberration is larger, and large astigmatism exists along the length direction of a slit. The optical device consists of an aperture diaphragm, an off-axis parabolic mirror, an entrance slit, a spherical collimating mirror, a plane grating, a plane mirror, a toroidal focusing mirror and a planar array focal plane detector. The entrance slit is positioned on a focal plane of a front optical system; the front optical system consists of the aperture diaphragm and the off-axis parabolic mirror; the emergent light passing though the entrance slit is projected onto the spherical collimating mirror and is then projected onto the plane grating after being collimated by the spherical collimating mirror; and the diffraction light emerged from the plane grating is projected onto the toroidal focusing mirror after being reflected by the plane mirror and then is focused and imaged by the toroidal focusing mirror onto the planar array focal plane detector. The optical device is particularly suitable for a hyperspectral imaging system in the aerospace remote sensing earth observation field.

Description

technical field [0001] The invention relates to the technical field of imaging spectrometers in the field of earth observation, in particular to an optical device of a wide-band plane grating dispersion imaging spectrometer. Background technique [0002] Compared with the prism dispersion imaging spectrometer, the grating dispersion imaging spectrometer has the characteristics of high spectral resolution and uniform dispersion, so the grating dispersion imaging spectrometer is being used more and more widely. Compared with concave aspheric gratings and convex gratings, planar gratings have the advantages of mature processing technology and good versatility. With the development of spectroscopic instruments, traditional planar grating dispersive spectrometers, such as grating monochromators and spectroradiometers, have successively appeared Ebert-Fastie type, Czerny-Turner ( Czerny-Turner) type, Littrow (Littrow) type and other optical structure types, but these existing pla...

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Application Information

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IPC IPC(8): G01J3/28G01J3/18
Inventor 薛庆生王淑荣
Owner CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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