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High precision interferometer: MIRC with photometric channels

2010; SPIE; Volume: 7734; Linguagem: Inglês

10.1117/12.857848

1996-756X

X. Che, John D. Monnier, Scott Webster,

Astronomical Observations and Instrumentation

We have designed and constructed a prototype of Photometric Channels for Michigan Infrared Combiner (MIRC). Photometric Channels provide direct real-time measurements of fluxes from individual telescopes, improving the precision of visibility and close phase calibration. While this prototype has increased the MIRC data quality since the commissioning in August 2009, it leaves several issues unresolved, such as the changing polarization of starlight due to the CHARA beam train. We are planning to make an improvement of the prototype in conjunction with the six-beam combiner upgrade in the summer 2011.