Experimental studies on near-field holographic antenna measurement
| Autor: | Li Yang, Sun Jixian, Ji Yang, Xuguo Zhang, Linfen Xu, Dengrong Lu, Xinghai Pang, Zheng Lou, Yingxi Zuo, Hongye An, Zhenqiang Li |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Physics
business.industry Aperture Terahertz radiation Antenna measurement Holography 020206 networking & telecommunications Near and far field 02 engineering and technology Repeatability 01 natural sciences law.invention Telescope Optics law 0103 physical sciences 0202 electrical engineering electronic engineering information engineering Antenna (radio) business 010303 astronomy & astrophysics |
| Zdroj: | SPIE Proceedings. |
| ISSN: | 0277-786X |
| DOI: | 10.1117/12.2232158 |
| Popis: | A near-field millimeter-wave holography system operating in the 3-mm waveband have been developed as a prototype for DATE5, a 5-m terahertz telescope proposed to be deployed at Dome A, Antarctica. Experimental measurements at 92 GHz have been made on a 1.45-m test antenna. During the night time at which the ambient temperature doesn’t vary rapidly, a 75-minute repeatability (repeating measurement 3 times) of ~2.3 μm rms has been achieved with an aperture resolution of 46 mm. A local surface change of known value is correctly detected. After long-time repeating measurements, thermal-induced feed displacement is also detected with an accuracy of approximately 20 μm. Random error factors of the experiment system are evaluated and their contributions to the derived surface error are also simulated, showing that relative poor pointing of the test antenna is the major factor limiting the measurement repeatability. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|