Journal of Atmospheric and Environmental Optics ›› 2011, Vol. 6 ›› Issue (2): 122-.

• 论文 • Previous Articles     Next Articles

Technology of Precise Measurement of Slit Aperture Area

HE Bo, ZHENG Xiao-bing, LI Xin, LI Kai, XU Wen-bin   

  1. (Key Laboratory of General Optical Calibration and Characterization, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031 , China)
  • Received:2010-06-21 Published:2011-03-29

Abstract:

In order to achieve the absolute uncertainty which is less than 0.05% and the relative stability which is 0.03% per year in 0.4 ? 1.0 ?m of solar absolute spectral irradiance observation, the slit aperture area must be measured with high-precision in the development of solar absolute irradiance spectra-radiometer. The flux comparison method is developed by using laser scanning for precise measurement of the slit aperture area. The laser-illuminated integrating sphere system is used as a light source, and the high-precision trap detector is used to receive signals. Small size apertures can be measured without a reference aperture. In the measurement of the entrance area of solar absolute irradiance spectra-radiometer of which the nominal area is 7 mm×0.1 mm, the total relative uncertainty is about 4.5× 10-4.

Key words: aperture area, precise measurement, flux comparison method, laser scanning method

CLC Number: