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arXiv 1608.04888astro-ph.IM
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VLTI仪器的计量系统GRAVITY

The metrology system of the VLTI instrument GRAVITY

Magdalena Lippa, Stefan Gillessen, Nicolas Blind, Yipting Kok, Senol Yazici, Johannes Weber, Oliver Pfuhl, Marcus Haug, Stefan Kellner, Ekkehard Wieprecht, Fran… 展开作者

Magdalena Lippa, Stefan Gillessen, Nicolas Blind, Yipting Kok, Senol Yazici, Johannes Weber, Oliver Pfuhl, Marcus Haug, Stefan Kellner, Ekkehard Wieprecht, Frank Eisenhauer, Reinhard Genzel, Oliver Hans, Frank Haussmann, David Huber, Tobias Kratschmann, Thomas Ott, Markus Plattner, Christian Rau, Eckhard Sturm, Idel Waisberg, Erich Wiezorrek, Guy Perrin, Karine Perraut, Wolfgang Brandner, Christian Straubmeier, Antonio Amorim

摘要:

VLTI仪器GRAVITY将来自四个望远镜的光束结合在一起,通过以双视场模式观测两个天体,提供相位参考成像以及10微弧秒级的精确天体测量。当干涉仪中的内部dOPD已知时,可以从它们的差分OPD(dOPD)确定它们的角分离。在这里,我们提出的新的计量系统,执行这些测量的一般概述。该计量包括一个三光束激光系统和零差检测方案的三光束干涉使用相移干涉法结合锁定放大器。通过这种方法,计量系统在纳米级上测量dOPD。

英文摘要:

The VLTI instrument GRAVITY combines the beams from four telescopes and provides phase-referenced imaging as well as precision-astrometry of order 10 microarcseconds by observing two celestial objects in dual-field mode. Their angular separation can be determined from their differential OPD (dOPD) when the internal dOPDs in the interferometer are known. Here, we present the general overview of the novel metrology system which performs these measurements. The metrology consists of a three-beam laser system and a homodyne detection scheme for three-beam interference using phase-shifting interferometry in combination with lock-in amplifiers. Via this approach the metrology system measures dOPDs on a nanometer-level.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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