Nova Dissertation Tracking System

Nova Dissertation Tracking System-5
Its parameters fluctuated over time requiring frequent (and troublesome) adjustment in order to obtain a high interferometric efficiency.Polarization mismatch is believed to be mainly responsible for the fluctuating and sometimes poor interferometric efficiency, and this is a general concern in the case of single-mode (guided wave) optical systems accepting both polarizations.Direct detection of exoplanets using long-baseline interferometry and visibility phase J. Le Poole View Abstract Proceedings SPIE v8445 Optical and Infrared Interferometry II, SPIE conference, Amsterdam, July 2012 The polarization-based collimated beam combiner and the proposed NOVA fringe tracker (NFT) for the VLTI Jeffrey A. SPIE 4006, pp 1068, Astronomical Interferometry, Proceedings of the conference "Interferometry in Optical Astronomy," held March 26 - 29, 2000, Munich, Germany Use of a Seeing Monitor to Determine the Velocities of Turbulent Atmospheric Layers Richard Roosen, Jeffrey Meisner View Abstract Working on the Fringe: Optical and IR Interferometry from Ground and Space. This refers to imbalance in the beam combiner which results in fluctuations of the incoming wavefronts and the proportion of power accepted by a spatial filter masquerading as a visibility, a common problem afflicting previous interferometric instruments and fringe trackers.

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a The Nu MI Off-axis $$\nu_e$$ Appearance (NOv A) experiment studies neutrino oscillations in the Nu MI (Neutrinos at the Main Injector) beam.

The goal of the experiment is to determine the mass hierarchy and measure $$\delta_$$, however it is also sensitive to $$\sin\theta_$$, and $$\Delta m^2_$$.

19 stars had a median residual better than .7% of the measured visibility.

Some parameters of the hardware were insufficiently characterized, controlled, and/or monitored.

Such limitations only became issues once VINCI was employed for generating scientific results that went well beyond its initial design as a test and alignment instrument. Pereira, Andreas Quirrenbach, David Raban, Amir Vosteen ABSTRACT The Polarization-Based Collimated Beam Combiner efficiently produces pairwise interference between beams from multiple telescopes.

From these shortcomings in an otherwise exemplary instrument, some obvious lessons can be learned. An important feature is achieving "Photometric Symmetry" whereby interference measurements have no first-order sensitivity to wavefront perturbations (or photometric variations following spatial filtering) which otherwise entail visibility measurements with increased error, bias, and nonlinearity in phase determination.

The talk will then concentrate on some technical issues affecting the instrument, both positive and negative, and some lessons that can be learned.

These issues are illustrated in each case using results obtained from analysis of on-sky (and some technical) data sets.

) but annotated to include material only presented orally at the conference: The polarization-based collimated beam combiner and the proposed NOVA fringe tracker (NFT) for the VLTI Talk presented (by coauthor A. Terquem, editors, Extrasolar Planets: Today and Tomorrow, volume 321 of ASP Conference Series, pages 125126, 30 June - 4 July For much more detail on this subject than they let me write in the paper, see my associated presentation.

Quirrenbach) at SPIE conference 7734, San Diego, July 2010 View Abstract See also the paper submitted to SPIE, below. Or you can read the two-page "paper" that they allowed to be published. of Minnesota (1995) View Abstract Online version in pdf format now available, courtesy Richard Mathar. Le Poole ABSTRACT The NOVA Fringe Tracker (NFT) is a proposed solution to the call by ESO for a second generation fringe tracking facility.


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