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Asymmetric spatial heterodyne spectrometer structure

A spatial heterodyne and asymmetrical technology, applied in interference spectroscopy, spectrum investigation, etc., can solve the problem of underutilization of the grating, and achieve the effect of simple structure, convenient installation and adjustment, and wide application range

Active Publication Date: 2017-01-25
INST OF OPTICS & ELECTRONICS - CHINESE ACAD OF SCI
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  • Abstract
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Problems solved by technology

[0006] The technical problem to be solved by the present invention is to propose a new structure of asymmetric spatial heterodyne spectrometer for the problem of insufficient utilization of the grating in the asymmetric spatial heterodyne spectroscopy technology integrated with koster prisms

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Embodiment 1

[0034] Embodiment 1 of the present invention is an asymmetric spatial heterodyne spectrometer with a spectral resolution greater than 40,000, a free spectral range greater than 7nm, a blaze wavelength of 632.8nm, and an optical path difference of 20mm between the two optical paths after beam splitting. like figure 1 As shown, the asymmetric spatial heterodyne spectrometer according to Embodiment 1 of the present invention includes: an entrance diaphragm 100 , a collimating objective lens 200 , a blazed grating 300 , an interference module 400 , an imaging lens 500 , and an array detector 600 . Among them, the aperture of the entrance diaphragm 100 is 200 μm, the numerical aperture is 0.22, the focal length of the collimating objective lens is 40 mm, the blazed wavelength of the blazed grating is 632.8 nm, the grating line density is 600 L / mm, the blaze angle is 10.94°, and the grating size is 20mm×20mm, the effective aperture is about 0.22×2×40mm=17.6mm; the oblique side of th...

Embodiment 2

[0038] Embodiment 2 of the present invention is an asymmetric spatial heterodyne spectrometer with a spectral resolving power greater than 25,000, a free spectral range greater than 25nm, a blaze wavelength of 1.6 μm, and an optical path difference of 25.4 mm between the two optical paths after beam splitting. like figure 1 As shown, the asymmetric spatial heterodyne spectrometer according to Embodiment 2 of the present invention includes: an entrance diaphragm 100 , a collimating objective lens 200 , a blazed grating 300 , an interference module 400 , an imaging lens 500 , and an array detector 600 . Among them, the aperture of the entrance diaphragm 100 is 600 μm, the numerical aperture is 0.39, the focal length of the collimating objective lens is 30 mm, the blazed wavelength of the blazed grating is 1.6 μm, the grating line density is 300 L / mm, the blaze angle is 13.88°, and the grating size is 25.4mm×25.4mm, the effective aperture is about 0.39×2×30mm=23.4mm; the oblique ...

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Abstract

The invention discloses an asymmetric spatial heterodyne spectrometer structure, which comprises an incident diaphragm, a collimator objective, a blazed grating, an interference module integrated by prisms, an imaging lens and an array type detector, wherein the interference module integrated by the prisms is a core part of the spectrometer structure, and is formed by a right trapezoid prism and an isosceles triple prism. Incident light is diffracted through the grating so as to enter the interference module, and is divided into two light beams through a beam splitting interface so as to be reflected by a plane mirror and a porro prism in the interference module respectively, so that non-equal optical path space interference of the two light beams is realized. The asymmetric spatial heterodyne spectrometer structure provided by the invention only needs one grating, has the advantages of simple light path, convenience in adjustment, high spectral resolution and the like since the interference module is integrated by the prisms, can be beneficial to effectively improving the integration level and the stability of a system, and has a wide application prospect in the multi-spectral line high-precision doppler velocity measurement field.

Description

technical field [0001] The invention belongs to the design field of spectral instruments and interference instruments, and relates to an optical structure design of an asymmetric space heterodyne spectrometer. Background technique [0002] The middle and upper atmosphere has a very important impact on human living environment and climate change. In response to global warming and the ozone hole over Antarctica, which have brought a series of environmental problems to human beings, it is necessary to detect and study the behavior of the middle and upper atmosphere. At the same time, in order to ensure the smooth progress of important launch missions such as aerospace, it is even more necessary to accurately monitor the meteorological conditions in the middle and upper atmosphere. Therefore, it is of great significance to obtain the change law of the middle and upper atmosphere accurately and efficiently. [0003] Atmospheric wind field is one of the most important parameters...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01J3/45
CPCG01J3/45
Inventor 方亮程欣彭翔张辉刘恩海
Owner INST OF OPTICS & ELECTRONICS - CHINESE ACAD OF SCI
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