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首页> 外文期刊>PASJ: Publications of the Astronomical Society of Japan >Development of a 22/43 GHz-band quasi-optical perforated plate and dual-band observation system of the Nobeyama 45 m telescope
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Development of a 22/43 GHz-band quasi-optical perforated plate and dual-band observation system of the Nobeyama 45 m telescope

机译：开发22/43 GHz带准光穿孔板和Noboyama 45 M望远镜的双频观察系统

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摘要

We have developed a system of simultaneous observations in the 22 and 43 GHz bands using the Nobeyama 45 m telescope, and are also working to add the 86 GHz band. Multi-frequency observations are realized by mounting perforated plates in the optics as dichroic frequency-selective devices. This paper presents the development of the perforated plate for the 22 and 43 GHz bands and the results of the commissioning observations with this plate on the Nobeyama 45 m telescope. The perforated plate is designed to be installed in the large telescope optics with a physical beam diameter as large as 50 cm for transmitting the higher frequency (43 GHz) band and for reflecting the lower frequency (22 GHz) band. The developed plate achieves an insertion loss of 0.22 dB (5%) at 43 GHz. The effects of the mounted plate on the systematic offsets and on the accuracy degradation of pointing were confirmed to be negligible. The differences in the main-beam/aperture efficiencies from those without the plate were confirmed to be within a few percent points. In addition, we successfully detected interferometry fringes in a very long baseline interferometry (VLBI) observation using the 45 m telescope and the VLBI Exploration of Radio Astrometry (VERA) 20 m telescopes, which confirmed that the dual-band observation system is operationally effective in both single-dish and VLBI observations.
机译：我们在使用NoboMaMa 45 M望远镜的22和43 GHz频段中开发了一个同时观察系统，并且还在努力添加86 GHz频段。通过将光学器件安装为二向色频率选择装置，实现多频观察。本文介绍了22和43 GHz频段穿孔板的开发，以及在NobeMama 45 M望远镜上用这款板的调试观测结果。穿孔板设计成安装在大到50cm的大至50cm的大望远镜光学器件中，用于发送较高频率（43GHz）频带并反映下频率（22GHz）频带。开发板在43GHz下达到0.22 dB（5％）的插入损耗。确认安装板对系统偏移和准确度降低的效果被证实可忽略不计。确认没有板材的主光束/孔径效率的差异在几个百分点内。此外，我们在使用45米望远镜和无线电星座（VERA）20米望远镜的VLBI探索的基线干涉测量（VLBI）观察中成功地检测到干涉测量条纹。单盘和VLBI观察。

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