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Long-wave infrared Doppler differential interferometer

A differential interference, long-wave infrared technology, applied in the field of fine spectral detection, can solve the problems of optical path difference, processing and adjustment accuracy requirements are very high, and achieve the effect of maintaining uniform illumination, improving relative illumination and reducing influence.

Pending Publication Date: 2019-06-11
XI'AN INST OF OPTICS & FINE MECHANICS - CHINESE ACAD OF SCI
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Problems solved by technology

[0002] Traditional atmospheric wind field detection technologies mainly include Fabry-Perot interferometric wind field detection technology and wide-angle Michelson interferometer wind field detection technology. The former has high resolution and high sensitivity, but requires very high processing and adjustment accuracy; The latter requires an optical path difference scanning device and can only detect one spectral line at a time

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Embodiment Construction

[0039] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

[0040] This embodiment provides an optical system of a long-wave infrared Doppler differential interferometer, including a front lens 1 , an interferometer 2 , a fringe imaging lens 3 and a detector (not shown). The detector can use a scientific grade CCD camera with a spectral range of 8-10 μm, a pixel size of 30 μm, an array size of 320×256, and an operating temperature of -40°C to +71°C.

[0041] see figure 1 In this embodiment, the front lens 1 includes a first aperture stop 101 , a first front lens 102 , a filter 103 , a field stop 104 and a second front lens 105 . Wherein the first aperture stop 101 is located on the first surface of the front lens 1, the first front lens 102 is a biconvex positive lens, the second front lens 105 is a meniscus positive lens, and the material is germanium, and the optical filter The central wav...

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Abstract

The invention provides an optical system of a long-wave infrared Doppler differential interferometer. The long-wave infrared Doppler differential interferometer comprises a front camera, an interferometer, a fringe imaging lens and a refrigerated infrared detector; the refrigerated detector is subjected to cold shield matching in a complete matching manner; the fringe imaging lens is in thermal-free design in a mechanical active type thermal compensation manner; therefore, an interferometer system can be assembled at normal temperature and normal pressure (20 DEG C, 1atm), and can work in a low-temperature vacuum environment (160K, 0atm); and thus, influence of thermal radiation of an optical-mechanical structure itself on the detection sensitivity is reduced. By means of the long-wave infrared Doppler differential interferometer in the invention, application of the split Doppler differential interferometer in a long-wave infrared band is realized; simulated interference fringes obtained by the interferometer system in the working band have relatively high modulation degree; and precision requirements of 24-60 km atmospheric wind velocity inversion and ozone concentration inversioncan be satisfied.

Description

technical field [0001] The invention belongs to the field of fine spectrum detection, and in particular relates to an optical system of a long-wave infrared Doppler differential interferometer. Background technique [0002] Traditional atmospheric wind field detection technologies mainly include Fabry-Perot interferometric wind field detection technology and wide-angle Michelson interferometer wind field detection technology. The former has high resolution and high sensitivity, but requires very high processing and adjustment accuracy; The latter requires an optical path difference scanning device and can only detect one spectral line at a time. Doppler differential interferometry is a new type of fine spectral detection technology, which has the advantages of high spectral resolution, high throughput, and high stability. The target source of the traditional atmospheric wind field detection method is the upper atmospheric airglow located in the visible light band of 80-300 ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/45
CPCY02A90/10
Inventor 冯玉涛韩斌张兆会李立波畅晨光白清兰
Owner XI'AN INST OF OPTICS & FINE MECHANICS - CHINESE ACAD OF SCI
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