According to the Science and Technology Daily, the team led by Associate Professor Wang Jian and the collaborators of the National Key Laboratory of Nuclear Detection and Nuclear Electronics of the Department of Physics of the University of Science and Technology of China, designed and tested several versions according to the characteristics of different infrared detectors. It solves the key technologies of weak signal detection, high gain sensitive amplification, undercurrent and background noise suppression. It first completes the J, H, K band near-infrared skylight background measuring instrument based on InSb detector, and completes the laboratory roof. test. Related results have been published in the internationally renowned magazine "Scientific Instrument Review".
The development of infrared astronomical research in China is limited by the lack of excellent sites and detectors. With the continuous expansion of the field of astronomical research in China in recent years, the desire of the Chinese astronomical community to have infrared astronomical observation capabilities is also more urgent. In order to ensure the successful and efficient development of infrared observation instruments and infrared astronomical observations after the successful construction of these large-scale equipment, it is necessary to measure the infrared sky background of the relevant candidate sites. The background radiation intensity in the infrared range largely limits some important properties of infrared telescopes and other observing equipment, such as the depth of the survey, the limit stars that can be observed, and the exposure time of the astronomical imaging system.
According to researchers, because InSb detectors require deep cooling, the power consumption and volume of the instrument are relatively large, which is very unfavorable for field observation. Based on the detection advantages of InGaAs detectors on the J, H, and K bands, it is based in 2017. The InGaAs detector completes the near-infrared skylight background measuring instrument for the South Pole, and conducted a test observation at the Ali Observatory in Tibet in July 2017. The first batch of Ali's near-infrared skylight background data was obtained, and the data showed that the summer Ali was near in the clear night. The intensity of the infrared skylight background is weak, and the stability of the equipment and the ability to monitor and operate for a long time are verified.
On this basis, in 2018, it is aimed at the extremely low temperature, high altitude and low pressure of the Antarctic (the average temperature of the Kunlun station in the extreme night -60 ° C, the lowest temperature -86 ° C, the altitude is 4087 m, the air pressure is 0.5 atmosphere), and the power is difficult. In the extreme conditions, the optical, low-noise readout electronics, structure and electronic control, and automatic observation of the infrared skylight background measuring instrument were improved accordingly. In November 2018, the "Snow Dragon" scientific research ship went to the South Pole. It was installed and put into operation at the Kunlun Station in Antarctica on January 23, 2019.
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