Journal of Atmospheric and Environmental Optics ›› 2018, Vol. 13 ›› Issue (3): 226-232.

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High-Precision Measurement on Area Ratio of Different Apertures

ZHAO Wenxian1,2, LI Xin1, ZHANG Yanla1   

  1. (1 Key Laboratory of Optical Calibration and Characterization, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Science, Hefei 230031, China; 
    2 University of Science and Technology of China, Hefei 230031, China)
  • Online:2018-05-28 Published:2018-05-31
  • About author:赵文贤(1991-),女, 汉族,硕士研究生,主要从事光学遥感辐射定标技术方面的研究。
  • Supported by:

    Supported by National Nature Science Foundation of China(国家自然科学基金,11204318,61275173,41271373), Anhui Nature Science Foundation(安徽省自然科学基金,1508085QD80)

Abstract:

In the project of on-orbit calibration, two apertures were designed with nominal diameters of 20 mm and 0.5 mm for switching observations of the earth and the sun, the high precision measurement of the two apertures area ratio is the key to ensure the calibration accuracy. The measurement method of the area of aperture was discussed briefly. Based on the measurements characteristics of the area of aperture, the ratio of the area of the two apertures to the area of the referenced aperture was measured by utilizing laser raster scanning and flux comparison. The area ratio of aperture Φ20 mm to Φ0.5 mm was 1604.381 with a total relative combined standard uncertainty 0.046%. The conclusion provides a feasible solution for the high-precision measurement of the aperture area ratio, and supports the on-orbit calibration of direct solar viewing.

Key words: direct observations of the sun; raster scanning, flux comparison, area ratio

CLC Number: