用于天文观测的InGaAs近红外探测器性能测试方法
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1.云南师范大学物理与电子信息学院;2.中国科学院云南天文台;3.昆明物理研究所

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大型太阳望远镜热光阑的关键技术研究


Performance test method of InGaAs near infrared detector for astronomical observation
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1.Physics and Electronic Information School,Yunnan Normal University;2.Yunnan Astronomical Observatory, Chinese Academy of Sciences;3.Kunming Institute of Physics

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    摘要:

    基于天文红外探测器评价体系,利用改进的“光子转移曲线”测试方法,分别测试了液氮制冷和热电制冷的两款InGaAs近红外探测器的性能。NIRvana-LN光电子与输出数字量的转换因子为0.16ADU/e-,读出噪声实测值是83 e-,远高于标称值15 e-;NIRvana的高、低转换因子分别为1.25ADU/e-和0.097ADU/e-,读出噪声分别为105 e-和380 e-;NIRvana在高转换因子档下暗电流实测值是415 e-/s,大约是标称值的2倍。理论估算云南天文台两米环形望远镜在1.565μm太阳磁场测量时的信号电子数约8800 e-,在实测暗电流4.06e-/s,像元曝光时间20ms,读出噪声83.59e-条件下,NIRvana-LN探测器信噪比为70

    Abstract:

    Based on the evaluation system of astronomical infrared detectors, the performance of two InGaAs NIR detectors, liquid nitrogen-cooled and thermoelectric-cooled, was tested using a modified "photon transfer curve" test method. The measured value is 83 e-, which is much higher than the nominal value of 15 e-; the high and low conversion factors of NIRvana are 1.25 ADU/e- and 0.097 ADU/e-, respectively, and the readout noise is 105 e- and 380 e-; the measured value of dark current of NIRvana at the high conversion factor step is 415 e-/s, which is about twice of the nominal value. The theoretical estimate of the signal electron number of the Yunnan Observatory two-meter ring telescope at 1.565μm solar magnetic field measurement is about 8800 e-, and the NIRvana-LN detector signal-to-noise ratio is 70 under the measured dark current of 4.06 e-/s, image exposure time of 20 ms, and readout noise of 83.59 e-.

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  • 收稿日期:2022-05-26
  • 最后修改日期:2022-06-26
  • 录用日期:2022-07-01
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