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Paper detail

The metrology system of the VLTI instrument GRAVITY

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.

preprint2016arXivOpen access
Magdalena LippaStefan GillessenNicolas BlindYipting KokSenol YaziciJohannes WeberOliver PfuhlMarcus HaugStefan KellnerEkkehard WieprechtFrank EisenhauerReinhard GenzelOliver HansFrank HaussmannDavid HuberTobias KratschmannThomas OttMarkus PlattnerChristian RauEckhard SturmIdel WaisbergErich WiezorrekGuy PerrinKarine PerrautWolfgang BrandnerChristian StraubmeierAntonio Amorim
astro-ph.IM
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Open access27 authors1 topic
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Magdalena LippaStefan GillessenNicolas BlindYipting KokSenol YaziciJohannes WeberOliver PfuhlMarcus HaugStefan KellnerEkkehard WieprechtFrank EisenhauerReinhard GenzelOliver HansFrank HaussmannDavid HuberTobias KratschmannThomas OttMarkus PlattnerChristian RauEckhard SturmIdel WaisbergErich WiezorrekGuy PerrinKarine PerrautWolfgang BrandnerChristian StraubmeierAntonio Amorim

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