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19 October 2018 Design of a near-infrared sky brightness monitor and field measurement at the Ngari Observatory, Tibet
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The Ngari (Ali) observatory is located in Ngari, Tibet, a region known as “the roof of the roof of the world.” The observatory benefits from abundant photometric nights, low perceptible water vapor, high transmittance, and good seeing. Due to these advantages, it promises to be one of the best locations in the world at which to make infrared and submillimeter observations. However, no data on the sky background radiation at this location are available, impacting the planning of future facilities at the observatory. To remedy this deficiency, a near-infrared sky brightness monitor (NISBM) has been designed to obtain data in the J, H, and Ks bands. This monitor is based on an InGaAs photoelectric diode and uses chopper modulation and digital lock-in amplifier processing, which considerably enhance its signal-to-noise ratio, detectivity, and data acquisition speed. An independent device has been designed for each band (J, H, and Ks) and calibrated in the laboratory. The NISBM was installed at the Ngari observatory in July 2017 and has obtained the first NIR sky brightness data for that location.
© 2018 Society of Photo-Optical Instrumentation Engineers (SPIE) 2329-4124/2018/$25.00 © 2018 SPIE
Qi-Jie Tang, Jian Wang, Shu-Cheng Dong, Jin-Ting Chen, Yi-Hao Zhang, Feng-Xin Jiang, Zhi-Yue Wang, Ya-Qi Chen, Ming-Hao Jia, Jie Chen, Hong-Fei Zhang, Qing-Feng Zhu, Peng Jiang, Tuo Ji, Shao-Hua Zhang, Yong-Qiang Yao, Yun-He Zhou, Hong-Shuai Wang, and Peng Tang "Design of a near-infrared sky brightness monitor and field measurement at the Ngari Observatory, Tibet," Journal of Astronomical Telescopes, Instruments, and Systems 4(4), 046002 (19 October 2018).
Received: 15 March 2018; Accepted: 26 September 2018; Published: 19 October 2018

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