22 July 2010 Coherent integration results from the NPOI
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Proceedings Volume 7734, Optical and Infrared Interferometry II; 77342Q (2010); doi: 10.1117/12.858298
Event: SPIE Astronomical Telescopes + Instrumentation, 2010, San Diego, California, United States
Abstract
In this paper we will discuss the current status of coherent integration with the Navy Prototype Optical Interferometer (NPOI). Coherent integration relies on being able to phase reference interferometric measurements, which in turn relies on making measurements at multiple wavelengths. We first discuss the generalized group-delay approach, then the meaning of the resulting complex visibilities and then demonstrate how coherent integration can be used to perform very precision measurement of stellar diameters. The phase of the complex visibility is particularly attractive as a data product because it is not biased in the same way as visibility amplitudes. We discuss the relative SNR of triple-product phases and single-baseline phases. We then demonstrate how singlebaseline phases can be used to make accurate measurements of magnitude differences and separations of binary stars.
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A. M. Jorgensen, H. R. Schmitt, J. T. Armstrong, D. Mozurkewich, E. K. Baines, R. Hindsley, D. Hutter, S. Restaino, "Coherent integration results from the NPOI", Proc. SPIE 7734, Optical and Infrared Interferometry II, 77342Q (22 July 2010); doi: 10.1117/12.858298; https://doi.org/10.1117/12.858298
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KEYWORDS
Visibility

Signal to noise ratio

Stars

Solids

Phase measurement

Calibration

Spectral resolution

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