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Liangliang Li

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Proceedings Article | 4 April 2023 Paper

Research on spectral calibration method of solar irradiance spectrometer based on fèry prism

Quan Zhang, Yanna Zhang, Ping Li, Liangliang Li, Fuxiang Guo, Dong Huang, Wei Wei, Xin Li

Proceedings Volume 12617, 1261777 (2023) https://doi.org/10.1117/12.2666807

KEYWORDS: Prisms, Spectroscopy, Spectral calibration, Visible radiation

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Spectral calibration accuracy of solar irradiance spectrometer plays an important role in the measurement of the absolute solar spectral irradiance. The solar irradiance spectrometer uses fèry prism to disperse composite light and linear CCD to control the scan of spectrum. The solar irradiance spectrometer has a spectral range of 380 nm ~ 2500 nm. In order to ensure the spectral response efficiency of different bands, three detectors are used to achieve spectral detection of different bands respectively. Single wavelength lasers distributed in different bands are used as the light source in the spectral calibration experiment, and the relationship between wavelength and CCD pixel is obtained through spectral scanning. The actual equivalent angle of fèry prism and spectral calibration equation are calculated. In this paper, two methods of calculating spectral calibration equation are studied. In the experiment, method one uses two characteristic wavelength points of visible near-infrared band to calculate the actual equivalent angle, which is taken as the common prism angle of the whole band. Method two uses the same two characteristic wavelength points as method one in the visible near-infrared band, and uses another characteristic wavelength point in the visible and short-wave infrared bands, respectively. Experimental analysis and calculation show that the pixel deviation of method two is 7.44 pixels and 23.78 pixels less than that of method one in visible and short-wave infrared bands, respectively. Therefore, calculating the actual equivalent angle of the prism in different wavebands can improve the accuracy of wavelength calibration.

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