Water Vapour Radiometers for the Australia Telescope Compact Array

Autor:	Indermuehle, Balthasar T., Burton, Michael G., Crofts, Jonathan
Rok vydání:	2012
Předmět:	Astrophysics - Instrumentation and Methods for Astrophysics Physics - Atmospheric and Oceanic Physics
Druh dokumentu:	Working Paper
DOI:	10.1017/pas.2013.013
Popis:	We have developed Water Vapour Radiometers (WVRs) for the Australia Telescope Compact Array (ATCA) that are capable of determining signal path length fluctuations by virtue of measuring small temperature fluctuations in the atmosphere using the 22.2 GHz water vapour line for each of the six antennae. By measuring the line of sight variations of the water vapour, the induced path excess and thus the phase delay can be estimated and corrections can then be applied during data reduction. This reduces decorrelation of the source signal. We demonstrate how this recovers the telescope's efficiency as well as how this improves the telescope's ability to use longer baselines at higher frequencies, thereby resulting in higher spatial resolution. A description of the WVR hardware design, their calibration and water vapour retrieval mechanism is given. Comment: 17 pages, 20 figures
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/1212.6101 Zobrazit plný text záznamu View this record from Arxiv