Imaging Science and Photochemistry ›› 2017, Vol. 35 ›› Issue (2): 140-146.DOI: 10.7517/j.issn.1674-0475.2017.02.140

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Performance Parameter Test of IRFPA Used in Astronomy Imaging Detection

FENG Zhiwei1,2,3, YANG Xiao1,2, BAI Xianyong1,2, DUAN Wei1,3, SONG Qian1,3, WU Hong1,3, ZHANG Zhiyong1,2   

  1. 1. National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, P. R. China;
    2. CAS Key Laboratory of Solar Activity, National Astronomical Observatories, Beijing 100012, P. R. China;
    3. Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, P. R. China
  • Received:2017-01-21 Revised:2017-02-20 Online:2017-03-15 Published:2017-03-15

Abstract:

Infrared imaging detection of astronomical objects is of great importance in astronomy and astrophysics. A high-performance infrared detector is crucial to infrared astronomical observations. The performance test and evaluation of an infrared focal plane array (IRFPA) detector in this article are significant for infrared astronomy. According to the particularity of astronomical application, we give test principles and methods of performance parameters such as gain, readout noise, linearity and dark current, by analyzing characteristics of an IRFPA detector. A laboratorial testing platform is established to realize the performance test of an IRFPA detector with a wavelength range of 1~14 μm. We have completed a performance test of an IRFPA detector made of a domestic 3~5 μm HgCdTe chip. The test results reveal that the linearity of the IRFPA detector is pretty good, over 99.9%. Due to the relatively large readout noise and dark current, there is still a wide gap between the IRFPA detector and high-performance astronomical detectors abroad.

Key words: astronomy, IRFPA detector, performance parameter