Wide-coverage high-resolution greenhouse gas imaging spectrometer and application thereof

Abstract

The invention discloses a wide-coverage high-resolution greenhouse gas imaging spectrometer and application thereof. An optical system of the spectrometer comprises a reflecting front telescope objective and a collimating lens, as well as multiple paths of independent spectroscopic imaging devices. The front telescope objective and the collimating lens are shared by multiple spectral channels, a spatial alignment problem does not need to be considered, and the structures of the two are of a three-mirror structure; the spectroscopic devices adopt a structure of near Littrow rack, prism+prism grating+prism, a reflecting immersion grating splits beams, and a prism wedge assists in chromatic dispersion and distortion correction; the imaging devices are of a transmitting pittswan structure. Thespectrometer provided by the invention has the advantages of wide coverage, low distortion, large relative aperture, high transmittance and high resolution and can be used for simultaneously performing high-accuracy quantitative detection on concentrations of four different types of greenhouse gases.

Description

technical field [0001] The invention relates to an imaging spectrometer, in particular to an imaging spectrometer suitable for high-precision remote sensing detection of atmospheric greenhouse gas concentration and its application, which has the characteristics of wide coverage, low distortion, large relative aperture, high resolution and high spectral resolution . Background technique [0002] In recent years, the problem of atmospheric environment has become increasingly prominent, and the impact of climate change has gradually intensified, which has become a hot spot of global concern. Atmospheric CO 2 and CH 4 Contributing the most to radiative forcing, it is the most dominant greenhouse gas responsible for global warming. Therefore, reducing the emission of these gases has been called one of the most significant environmental challenges of the 21st century. Using satellites to measure the global distribution of atmospheric greenhouse gas concentrations through inten...

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Problems solved by technology

[0003] The OCO / OCO-2 satellite developed by the United States and the TANSAT satellite developed by China have verified the possibility of planar gratings to detect atmospheric carbon dioxide concentration, and have realized the application in space, but are limited by the large distortion of the grating, low diffraction efficiency, and only Insufficient detection of TM polarization state information, etc., the overall energy utilization rate of these two greenhouse gas spectrometers is low, and the ground coverage is small

The greenhouse gas detector TANSO-FTS on the Japanese GOSAT satellite uses a Fourier transform interferometric spectrometer, which also achieves high-precision detection of atmospheric greenhouse gases, but its ground sampling points are isolated areas, and it is difficult to obtain spatially continuous CO2 concentration information.

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