A spectral calibration system suitable for thermal infrared hyperspectral imager

Abstract

The invention discloses a spectrum calibration system suitable for a thermal infrared hyperspectral imager. According to the calibration system, a globar can emit stable thermal infrared radiation, and the thermal infrared radiation enters a monochrometer through a focusing lens, a reflector and a beam expanding lens, the thermal infrared radiation with the high spectral resolution is emitted after beam split is conducted on the thermal infrared radiation through the monochrometer and is received by the thermal infrared hyperspectral imager, spectrum calibration is conducted through a wavelength scanning method, and spectral response functions of all wave bands are obtained. After wavelength scanning spectrum calibration is conducted on the thermal infrared hyperspectral imager through the globar, a monochrome beam emitted by a wavelength-tunable CO2 infrared laser serves as a light source, a plurality of characteristic wavelengths of the wavelength-tunable CO2 infrared laser are selected by transforming the emitted wavelength of the infrared laser, and absolute calibration is conducted on the thermal infrared hyperspectral imager through a characteristic wavelength spectrum calibration method. By means of the spectrum calibration system suitable for the thermal infrared hyperspectral imager, quick spectrum calibration of the thermal infrared hyperspectral imager with the high spectral resolution is achieved, and the spectrum calibration error value is smaller than 1 nm.

Description

technical field [0001] The invention relates to a spectrum calibration system, in particular to a laser-based thermal infrared hyperspectral imager spectrum calibration system which uses an infrared laser to perform spectral calibration on a thermal infrared hyperspectral imager. Background technique [0002] The thermal infrared hyperspectral imager has a high spectral resolution, and its resolution can reach λ / 100. It has the characteristics of map-spectrum integration, and can more precisely describe the radiation spectral characteristics of ground objects. Thermal infrared hyperspectral images can not only retrieve the surface temperature more accurately, but also the emissivity curve can be used for object classification. Thermal infrared hyperspectral images will be widely used and have satisfactory application effects in the fields of land resources survey, ecological environment research, urban thermal environment research, agricultural resource environment research,...

AI Technical Summary

Problems solved by technology

However, the calibration accuracy of this kind of spectral calibration system cannot meet the spectral calibration requirements of thermal infrared hyperspectral imagers (Δλ / 10)

It can be considered that there is no spectral calibration fully suitable for thermal infrared hyperspectral imagers

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