SUN Hong-sheng,LIANG Xin-gang,MA Wei-gang,et al.Calibration of VUV spectroradiometers for space exploration[J].Optics and Precision Engineering,DOI:10.37188/OPE..0001
Calibration of VUV spectroradiometers for space exploration
Vacuum ultraviolet spectral radiometers is one of the most important instruments for space exploration, which is used to detect the distribution of ionosphere and ozone. It is a key procedure to calibrate vacuum ultraviolet spectral radiometers before launch. At present the lower calibration capability of National Institute of Metrology in non vacuum ultraviolet band is 200nm. In order to solve the calibration of the radiation parameter of the vacuum ultraviolet spectral radiometers in 115nm, the calibration method of the spectral radiance of the vacuum ultraviolet band, mean 115nm-200nm was studied. There Two calibration method
s
are designed to solve the problems of low uniformity of calibration source, long value transfer chain and insufficient lower limit of calibration band. They are based on the calibration methods of vacuum ultraviolet standard diffuse reflectors and standard vacuum ultraviolet radiometer. In the method based on the standard diffuse reflectors, the vacuum ultraviolet BRDF or BTDF measurement standard component is developed to measure the lowest wave band is 115nm. In the method based on the standard radiometer, the corresponding standard design method of vacuum ultraviolet spectral radiance transfer is proposed, the standard field of view angle is 2° and the verification is completed under vacuum condition. A new standard vacuum ultraviolet diffuse transmission device is proposed. It is spatial distribution characteristics are measured and has a good uniform radiation Lambert characteristics in the range of ±10°. The calibration devices are developed, and the value transfer chain and measurement uncertainty were analyzed. The results showed that the BRDF measurement uncertainty component was reduced and the measurement uncertainty was better. The calibration test of the payload on FY satellite was carried out by using the calibration device. The uncertainty of spectral radiance measurement in the range of 115nm-200nm is 12%(
k
=2), and the payload runs well in orbit. The research on the calibration method and equipment of vacuum ultraviolet spectral radiometer is of great significance to the research and application of vacuum ultraviolet space exploration technology.
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