Measurement and analysis of atmospheric infrared background radiation of typical astronomical observatories

Fang, 张芳 Zhang; Shuangyuan, 陈双远 Chen; Linlin, 齐琳琳 Qi; Chengming, 韩成鸣 Han; Li, 曾 丽 Zeng; Fangyu, 许方宇 Xu

doi:10.3788/irla201948.1203010

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“…K is the conversion between analog and digital signal conversion and represents the number of electrons corresponding to one digital-to-analog conversion unit in e -/ADU.Its size determines the evaluation of other performance parameters. It is generally tested by the " photon transfer curve method" together with the detector readout noise [11] .During the test, first adjust the exposure time of the camera to obtain the IR detector imaging device can achieve. The chip is blocked to ensure that no photons reach the photosensitive area during the readout process, 100 frames are acquired at each integration time point, and the output signal readout is obtained by averaging multiple frames.…”

Section: K and Readout Noisementioning

confidence: 99%

Observation of sunspots at He I 10830Å using a low-noise InGaAs infrared detector

Sun

Xiang

Fan

et al. 2023

Earth and Space: From Infrared to Terahertz (ESIT 2022)

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：The infrared spectra of the Sun include numerous absorption lines, among which He I 10830 Å is one of the most representative spectral lines in the near-infrared band formed in the high-temperature region of the upper chromosphere. The observation of the spectral lines is important for the solar physics research. In this paper, the monochromatic images of sunspots in the He I 10830 Å spectral line was obtained by the one-meter new vacuum solar telescope at the Fuxian Lake solar observation base. The infrared detector using the domestic InGaAs 640×512 focal plane array device can reach a low dark current of 62e -/s/pixel and readout noise of 25.4 eat 78K by Stirling cooler. The laboratory tests and actual astronomical observations were completed. In the case of large detector readout noise and dark current, a method of extracting the observation target by effectively calculating the flat field was proposed. A monochromatic image of sunspots with He I 10830 Å is obtained for the first time in China using the self-developed detector.

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Section: K and Readout Noisementioning

confidence: 99%