Practical coherent integration with the NPOI

Anders M. Jorgensen; Dave Mozurkewich; Henrique Schmitt; Robert Hindsley; J. Thomas Armstrong; Thomas A. Pauls; D. Hutter

doi:10.1117/12.790305

28 July 2008 Practical coherent integration with the NPOI

Anders M. Jorgensen, Dave Mozurkewich, Henrique Schmitt, Robert Hindsley, J. Thomas Armstrong, Thomas A. Pauls, D. Hutter

Author Affiliations +

Proceedings Volume 7013, Optical and Infrared Interferometry; 70131E (2008) https://doi.org/10.1117/12.790305
Event: SPIE Astronomical Telescopes + Instrumentation, 2008, Marseille, France

Abstract

In this paper we will discuss the current status of coherent integration with the Navy Prototype Optical Interferometer (NPOI).¹ 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 properties. For example, we demonstrate how we can measure the diameter of a star to a precision of one part in 350, and measure properties of binary stars. The complex phase is particularly attractive as a data product because it is not biased in the same way as visibility amplitudes.

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Anders M. Jorgensen, Dave Mozurkewich, Henrique Schmitt, Robert Hindsley, J. Thomas Armstrong, Thomas A. Pauls, and D. Hutter "Practical coherent integration with the NPOI", Proc. SPIE 7013, Optical and Infrared Interferometry, 70131E (28 July 2008); https://doi.org/10.1117/12.790305

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