Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006mnras.367.1194s&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Volume 367, Issue 3, pp. 1194-1200.
Astronomy and Astrophysics
Astronomy
1
Instrumentation: Detectors, Instrumentation: Interferometers, Methods: Analytical, Methods: Numerical, Techniques: Interferometric, Telescopes
Scientific paper
We describe a procedure for the numerical modelling of astronomical interferometers, with particular relevance to far-infrared and submillimetre wavelengths. The scheme is based on identifying a set of modes that carry power from the sky to the detector. The procedure is extremely general, and can be used to model scalar or vector fields, in any state of coherence and polarization, the only limitation being that the propagation of a coherent field through the system be described by an integral transform, a constraint that is in practise always met.
We present simulations of ideal, multimode two-dimensional interferometers, and show that the modal theory reproduces the correct behaviour of both Michelson and Fizeau interferometers. We calculate simulated visibility data for a multimode bolometric Michelson interferometer, with a synthesized source, and produce a dirty map, recovering the original source with the usual artefacts associated with interferometers.
Hobson Michael P.
Saklatvala George
Withington Stafford
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