Fourier transform spectrometer

Abstract

The invention provides a Fourier transform spectrometer. Spectrum segmentation is realized by utilizing a double-grating system in one dimension, so that an optical axis is not folded, the adjustment and correction difficulty of each element of the system is reduced, and the complexity of the system is reduced. In another dimension, band-pass sampling is realized by utilizing a spatial modulation interference system, so that the cross coupling modulation of chromatic dispersion and interference of an incident light field is realized in two orthogonal directions. A narrow slit and a large array refrigeration detector which need to be adopted by a chromatic dispersion spectrometer for realizing infrared high spectral resolution are avoided, the limitation of a core device is eliminated, and relatively high luminous flux and signal-to-noise ratio are achieved; meanwhile, a static structure is adopted, manufacturing and control difficulties caused by moving parts are avoided, and the reliability, the stability and the real-time performance are better; and a measurement mechanism of spectrum segmentation and band-pass sampling is adopted, so that the contradiction of mutual restriction between the spectrum bandwidth and the spectrum resolution is solved.

Description

technical field [0001] The invention belongs to the technical field of spectrum measurement, and in particular relates to a Fourier transform spectrometer based on double-grating diffraction interference quadrature coupling modulation. Background technique [0002] With the progress of society and the development of science and technology, infrared spectroscopy has been widely used in physics, chemistry, life, geology, medicine and other fields, and has played an important role in the exploration and discovery of new materials, new energy and the unknown world. effect. In recent years, with the emergence and development of high-tech fields such as meteorological observation, environmental monitoring, space remote sensing detection, and military ground object reconnaissance and analysis, due to its special application environment and conditions of use, the infrared spectrum detection technology and instruments in terms of volume and performance put forward higher requirement...

AI Technical Summary

Problems solved by technology

However, due to the high-precision moving mirror scanning mechanism and the precise reference light source sampling control system, the volume and weight of the instrument are increased, which limits its application in high-tech fields such as space exploration, meteorological remote sensing, and military reconnaissance.

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