The research on calibration technology of vacuum ultraviolet spectroradiometer

Abstract

With the rapid development of vacuum ultraviolet detection technology, vacuum ultraviolet spectrum radiometers are increasingly used in space detection. Vacuum ultraviolet spectrum radiometers can acquire ionospheric disturbance information, solar activity information, celestial activity information, etc. Meteorological forecasting, defense and military security play an important role in supporting data. Typical examples of vacuum ultraviolet spectroradiometers are ionospheric photometers and wide-angle aurora imagers. Many of the satellites launched in the early stage are equipped with such vacuum ultraviolet spectroradiometers. Before the launch, the vacuum ultraviolet spectrometer needs to perform calibration test on the ground to establish a corresponding mathematical relationship between the output data and the input energy. However, the current domestic calibration device for the vacuum ultraviolet spectrometer has not been established, and vacuum ultraviolet light cannot be guaranteed. The accuracy of the calibration of the spectroradiometer, which in turn affects the accuracy of the inversion data, has a serious impact on national meteorological predictions, military safety, and so on. This paper provides a vacuum ultraviolet spectrum radiometer calibration scheme, including spectral radiance brightness responsivity calibration device, wavelength accuracy calibration device, vacuum ultraviolet BRDF measurement device, etc., which can achieve spectral radiance responsiveness and wavelength to vacuum ultraviolet spectroradiometer Calibration of parameters such as accuracy, and measurement of BRDF for vacuum ultraviolet diffuse reflectors. The spectral radiance responsiveness calibration device includes a vacuum chamber system, a vacuum ultraviolet light source, a vacuum ultraviolet integrating sphere, a vacuum ultraviolet diffuse reflector, a standard radiometer, and the like. The wavelength accuracy calibration device includes a vacuum chamber system, a vacuum ultraviolet light source, a vacuum ultraviolet monochromatic spectroscopic system, a standard filter, and a vacuum ultraviolet collimating optical system. The vacuum ultraviolet BRDF measuring device includes a vacuum chamber system, a vacuum ultraviolet light source, a vacuum ultraviolet monochromatic beam splitting system, a vacuum ultraviolet collimating optical system, a high-precision two-dimensional turntable, and a vacuum ultraviolet standard detector. Through technical breakthroughs, this paper breaks through the vacuum ultraviolet standard radiometer design technology, vacuum ultraviolet diffuse reflector BRDF measurement technology, large area high uniformity vacuum ultraviolet Lambertian radiation surface design technology, and synchronous radiation based traceability technology. The content of this paper mainly includes the overall scheme of calibration equipment, subsystem scheme, test data and uncertainty synthesis. Through the analysis and calculation of the test data, it can be known from the calculation results that the uncertainty of the spectral radiance responsivity measurement of the calibration device is better than 13% (K=2), and the uncertainty of the wavelength accuracy measurement is better than 0.1 nm (K= 2), BRDF measurement angle range is better than ± 60°. Compared with the measurement technology capabilities of other domestic research units, the calibration device covers the vacuum ultraviolet band, and the measurement uncertainty can meet the calibration requirements of the domestic vacuum ultraviolet space load development unit, effectively solving the calibration problem of vacuum ultraviolet space load. Through the development of the vacuum ultraviolet spectrum radiometer calibration device, the calibration problem of the domestic vacuum ultraviolet spectrum radiometer is solved, the vacuum ultraviolet measurement technology capability of China is improved, and the development of the vacuum ultraviolet spectrum radiometer is effectively guaranteed.