A High Modulation Degree Fourier Transform Spectrum Acquisition Method and Spectrometer

Abstract

The invention discloses a high modulation degree Fourier transform spectrum obtaining method and spectrograph. The method comprises the steps that after a broadband spectrum is dispersed, continuous monochromatic light is obtained; interferometry is conducted on the monochromatic spectrum, so that a high modulation monochromatic light interference pattern is obtained. Continuous monochromatic light splitting of the broadband spectrum is achieved through a dispersion element, the modulation degree of the interference pattern at the long optical path difference position is high, and the Fourier transform spectrograph is stable in structure, wide in waveband and high in modulation degree.

Description

technical field [0001] The invention relates to the technical field of optical imaging, in particular to a high-modulation degree Fourier transform spectrum acquisition method and a spectrometer. Background technique [0002] As an important means of modern spectral analysis technology, Fourier transform spectroscopy (also known as interference spectroscopy) is a research focus in the field of spectral technology. At present, the application of this technology is very wide, especially in the field of atmospheric remote sensing. Its high precision, high sensitivity, high spectral resolution and other advantages have been widely used in many fields such as material analysis and atmospheric detection. [0003] Compared with the traditional Michelson interferometer, there are no moving parts in the Fourier transform spectrometer, which has better stability and environmental adaptability. [0004] There are two main types of Fourier transform spectrometers at present, one is cal...

AI Technical Summary

Problems solved by technology

The advantage of spatial heterodyne Fourier transform spectrometer is that the interferogram modulation degree is high and the spectral resolution is high, but its disadvantage is that the measurement spectral range is very limited; the advantage of spatial modulation Fourier transform spectrometer is that the measurement spectral range is wide, but its disadvantage is that the interferogram is in the The modulation degree at the long optical path difference decreases sharply with the increase of the spectral range, and the interference modulation signal is submerged by noise

In the process of reconstructing the spectrum from the interferogram, in order to reduce the influence of noise on the reconstructed spectrum, filtering is usually required, which will reduce the spectral resolution and cause the reconstructed spectrum to be distorted

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