Imaging Science and Photochemistry ›› 2020, Vol. 38 ›› Issue (3): 424-429.DOI: 10.7517/issn.1674-0475.191106

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The Solar CO 4.6 μm Infrared Imaging Observation

WEI Yeyan1,2,3, BAI Xianyong2,4, ZHANG Zhiyong2,4, SONG Qian2,3, FENG Zhiwei2,3,4   

  1. 1. University of Chinese Academy of Sciences, Beijing 100049, P. R. China;
    2. National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100101, P. R. China;
    3. Key Laboratory of Optical Astronomy, Chinese Academy of Sciences, Beijing 100101, P. R. China;
    4. Key Laboratory of Solar Activity, Chinese Academy of Sciences, Beijing 100101, P. R. China
  • Received:2019-11-06 Online:2020-05-15 Published:2020-05-15

Abstract: The solar infrared spectral band contains many information about the solar physics. Among these molecular bands, the CO 4.6 μm band is the most representative one, which forms around the lowest temperature zone. It's of great significance to study solar physics. In order to get a monochromatic image of the solar CO 4.6 μm band, a total reflected infrared imaging observing system is built here. In the observing system, a coelostat is applied to guide the solar light to an imaging mirror, which reflects the solar image to the focal plane of a 3-5 μm infrared detector. The detector of the system is made of an indigenous HgCdTe infrared focus plane array. For improving the signal to noise ratio, a new flat field correction and observed object extraction method is put forward. Using this method, a solar monochromatic image of CO 4.6 μm band is obtained.

Key words: solar imaging system, mid-infrared CO 4.6 μm, HgCdTe detector, flat field correction