Wide-band and Air Dispersion Effecting the ABCD Algorithm of Phase-Recovery in Long-baseline Interferometry

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dc.creatorMathar, Richard J.
dc.date2006-05-11
dc.date2007-01-24
dc.date.accessioned2026-07-07T11:04:02Z
dc.date.available2026-07-07T11:04:02Z
dc.descriptionLong-baseline interferometry detects fringes created by superposition of two beams of light collected by two telescopes pointing into a common direction. The external path difference generated by pointing away from the zenith is commonly compensated by adding a variable optical path length (delay) through air for one beam such that the optical path difference between the beams remains close to zero near the detector. The ABCD formula assigns a (wrapped) phase to the amplitudes A to D of an interference pattern shifted by multiples of 90 degrees in phase. We study the interplay between a wide band pass of the optics and the dispersion of the air in the compensating delay, which leads to small deviations between the ABCD phase and the reduced, monochromatic group-delay representation of the wave packets. In essence, this adds dispersion to the effects that have been discussed for evacuated interferometers (telescopes in space) before [J. Opt. Soc. Am. A 22 (2005) 2774].
dc.descriptionCorrected 1.6 mm PWV data in Figs 13+14. Corrected in-line eq. in sect. V.C.1
dc.identifierhttps://arxiv.org/abs/astro-ph/0605304
dc.identifierhttp://arxiv.org/abs/astro-ph/0605304
dc.identifierBalticAstron.16:287-308,2007
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/188751
dc.subjectAstrophysics
dc.titleWide-band and Air Dispersion Effecting the ABCD Algorithm of Phase-Recovery in Long-baseline Interferometry
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