@article{594221be344a40b18b79933b9e46b8b3,
title = "The Navy Precision Optical Interferometer (NPOI): An update",
abstract = "The Navy Precision Optical Interferometer (NPOI) has two purposes: wide angle precise astrometry and high-resolution imaging, both at visible wavelengths. It operates with up to six 12-cm diameter apertures simultaneously, with baseline lengths (distances between array elements) from 16 m to 79 m, and disperses the combined light into 16 spectral channels. It has been operational since first fringes were found in 1994; six-beam operations began in 2001. The NPOI is undergoing upgrades in numerous areas: Control system and data acquisition improvements, a second beam combiner, additional array stations for both longer and shorter baselines, and supplemental delay lines to improve sky coverage for the longer baselines. Future possibilities include the installation of four fixed 1.8 m telescopes as well as up to six moveable lightweight 1.4 m telescopes. Observing programs, including programs led by outside investigators, cover a broad range of stellar astrophysics as well as observations of geostationary satellites.",
keywords = "Instrumentation: Interferometers, techniques: Interferometric",
author = "Armstrong, {J. T.} and Hutter, {D. J.} and Baines, {E. K.} and Benson, {J. A.} and Bevilacqua, {R. M.} and T. Buschmann and Clark, {J. H.} and A. Ghasempour and Hall, {J. C.} and Hindsley, {R. B.} and Johnston, {K. J.} and Jorgensen, {A. M.} and D. Mozurkewich and Muterspaugh, {M. W.} and Restaino, {S. R.} and Shankland, {P. D.} and Schmitt, {H. R.} and C. Tycner and {Van Belle}, {G. T.} and Zavala, {R. T.}",
note = "Funding Information: The NPOI is a joint project of the Naval Research Laboratory and the US Naval Observatory in cooperation with Lowell Observatory, and is funded by the Oceanographer of the Navy and the Office of Naval Research. We thank the NSF for support for work at New Mexico Tech through grant AST-0909184 and for VISION at Tennessee State through grant AST-0958267, as well as the Lowell Observatory Predoctoral Fellowship program for continued support for work on VISION. MWM acknowledges support from Tennessee State University and from the State of Tennessee through its Centers of Excellence program. Publisher Copyright: {\textcopyright} 2013 World Scientific Publishing Company.",
year = "2013",
month = dec,
day = "1",
doi = "10.1142/S2251171713400023",
language = "English",
volume = "2",
journal = "Journal of Astronomical Instrumentation",
issn = "2251-1717",
number = "2",
}