E.T. Phone Home 📡 : 無料・フリー素材/写真
E.T. Phone Home 📡 / jurvetson
| ライセンス | クリエイティブ・コモンズ 表示 2.1 |
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| 説明 | Having just found a home in our space museum, this pyramidal tree is the focal point “feed” from the Allen Telescope Array that SETI is using to search for signs of extraterrestrial intelligence in distant solar systems. Nestled up in the focal point of each dish, the tree of triangles tunes across a wide frequency band, from 0.5 to 11 GHz. Near the tip, highly specialized low-noise amplifiers (LNAs) take the signal from the feed and output it onto micro-coax cables to the back of the feed where the control electronics reside. The analog signal is then transmitted via fiber-optic links to the signal processing room where it is converted to a digital signal for correlating, beam forming and signal processing, integrating across the array of antennae. The net effect is a phased array antenna that acts like an integrated dish observing three different solar systems at the same time. This allows them to ignore interference and common spectra by focusing the search on signal that comes from only one of the three systems under observation. Here is a simple pictorial of how the phased-array antennae work... An artifact in the Future Ventures’ 🚀 Space Collection. Thanks S.E.T.I. |
| 撮影日 | 2022-07-15 15:59:44 |
| 撮影者 | jurvetson , Los Altos, USA |
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| カメラ | iPhone 12 Pro Max , Apple |
| 露出 | 0.008 sec (1/120) |
| 開放F値 | f/1.6 |