High spectral resolution interferometer

Abstract

The invention provides a high spectral resolution interferometer, which is provided with two movable angle mirror groups which are connected back to back, wherein each movable angle mirror group is provided with N movable angle mirror units which are arranged in sequence; N-1 fixed angle mirror units are oppositely arranged at the adjacent positions of the N movable angle mirror units and are usedfor sequentially reflecting emergent light of the movable angle mirror unit positioned at the head end to the movable angle mirror unit positioned at the tail end; and then the emergent light of themovable angle mirror unit positioned at the tail end is reflected back along the original path by a fixed plane reflector. Therefore, in the moving process of the two movable angle mirror groups, since multiple light path round trips are generated between the movable angle mirror group and the fixed angle mirror unit and between the movable angle mirror group and the fixed plane mirror respectively, the interferometer which originally can only generate two times of optical path difference becomes an interferometer which can generate 16 times or more times the optical path difference by a factor of 8. According to the invention, volume of the interferometer can be reduced with the resolution unchanged, and spectral resolution of the interferometer can be improved with the volume unchanged.

Description

technical field [0001] The invention relates to an interferometer, in particular to a Fourier transform infrared spectrometer. Background technique [0002] Fourier transform infrared spectrometers are widely used in gas, liquid and solid chemical and material component analysis, and are widely used in many fields such as medicine, petrochemical, and atmospheric monitoring. Fourier transform high-resolution infrared spectrum analysis telemetry satellites can be widely used in tropospheric atmospheric environment monitoring and ground environment remote sensing, two-dimensional Fourier transform high-resolution infrared hyperspectral analysis technology is of great significance in national defense. [0003] The core component of the FTIR spectrometer is the interferometer. The Michelson interferometer was invented by Albert Michelson in 1887. Michelson was awarded the 1907 Nobel Prize in Physics for his invention of the interferometer and the measurement of light beams. Si...

AI Technical Summary

Problems solved by technology

[0009] To sum up, the most classic Fourier transform infrared spectrometer interferometer currently on the market still uses a planar moving mirror as a reflector. In order to achieve a large optical path difference, the moving axis of the moving mirror can only be lengthened continuously, resulting in The entire interferometer is relatively long (for example, in order to achieve a spectral resolution of less than 0.01cm -1 , the planar moving mirror needs at least a 50 cm moving distance), which makes it difficult to balance high precision and small size

[0010] Moreover, in order to meet the requirements for high spectral resolution infrared interferometers in aerospace remote sensing, environmental monitoring and national defense, it is necessary to make the design spectral resolution of the interferometer reach 0.001cm -1 , which means that a conventional Michelson interferometer requires an optical path difference of at least 1000 cm (10 m)

In other words, the traditional Michelson interferometer needs a 5-meter-long guide rail to pull the movement of the movable mirror in the interferometer, which means that the interferometer has a huge volume, and it is very difficult to realize it on the ground or on the satellite. of

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