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Front common-caliber dual-band achromatic lens of Fourier transform imaging spectrometer

An imaging spectrometer and Fourier transform technology, applied in the field of spectral imaging, can solve the problems of inability to obtain full-frame clear images, difficulty in system installation and calibration, and low illumination at the edge of the image plane, achieving easy alignment and low processing costs , The effect of image quality reduction

Active Publication Date: 2020-04-10
CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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Problems solved by technology

[0006] The present invention aims to solve the problem of lack of map information caused by low illumination at the edge of the image plane of a space-time combined modulation type Fourier transform imaging spectrometer based on a stepped mi

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  • Front common-caliber dual-band achromatic lens of Fourier transform imaging spectrometer
  • Front common-caliber dual-band achromatic lens of Fourier transform imaging spectrometer
  • Front common-caliber dual-band achromatic lens of Fourier transform imaging spectrometer

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specific Embodiment approach 1

[0024] Specific implementation mode 1. Combination Figure 1 to Figure 7 Describe this embodiment, a common-aperture dual-band achromatic lens at the front of a Fourier transform imaging spectrometer, which uses a three-piece refraction structure as a common-aperture telephoto system, and the apertures are set in sequence from the object side to the image side according to the optical path direction A diaphragm 1, a first lens 2, a second lens 3, a third lens 4, a beam splitter 5, a compensation plate 6, and a stepped micromirror 7 (image plane). The first lens 2 is a positive diopter convex lens made of zinc selenide, the second lens 3 is a negative diopter concave lens made of zinc sulfide, and the third lens 4 is a negative diopter concave lens made of single crystal germanium. Both the beam splitter 5 and the compensation plate 6 are flat plates made of zinc selenide. According to the differences of the Abbe numbers of different materials in different wave bands, reasonab...

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Abstract

The invention, which relates to the technical field of spectral imaging, discloses a preposed common-caliber dual-band achromatic lens of a Fourier transform imaging spectrometer, thereby solving problems existing in the existing wide-spectrum infrared telescopic system. The lens comprises an aperture diaphragm, a first lens, a second lens, a third lens, a beam splitter, a compensation plate and astepped lens that are sequentially arranged from an object side to an image side according to the optical path trend. The first lens is a convex lens with positive diopter, the second lens is a concave lens with negative diopter, and the third lens is a concave lens with negative diopter. According to the invention, an image space telecentric light path is adopted; the relative illuminance of theimage surface edge is close to 1; distortion in dual bands is smaller than-0.2%, transmission values at 101p/mm are close to diffraction limit, the focal depth of the system meets the total height ofthe stepped mirror; a design result shows that the maximum change rate of an MTF value during imaging at different stepped height positions does not exceed 0.9%; and meanwhile, the lens further has advantages of being large in caliber, high in flux and the like.

Description

technical field [0001] The invention relates to the technical field of spectral imaging, in particular to a space-time joint modulation type Fourier transform infrared imaging spectrometer based on a stepped micro-mirror. The front common aperture dual-band achromatic lens. Background technique [0002] With the maturity of spectral detection technology, spectroscopic instruments put forward higher and higher requirements for the detection spectrum. Since the infrared characteristic absorption peaks of most substances are concentrated in the mid- and long-wave infrared bands, it is necessary for spectroscopic instruments to simultaneously detect these Two bands are detected. [0003] In order to realize the simultaneous detection of the medium and long-wave infrared bands, two solutions are generally adopted for the front-end imaging system of the existing broadband spectral instruments. The first is to use two separate medium and long-wave front lenses to image the two ban...

Claims

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Application Information

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IPC IPC(8): G02B13/00G02B13/22
CPCG02B13/0015G02B13/0035G02B13/0065G02B13/22
Inventor 梁静秋任俊吕金光王惟彪秦余欣陶金赵百轩
Owner CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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