淡江大學機構典藏:Item 987654321/96124
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    Please use this identifier to cite or link to this item: https://tkuir.lib.tku.edu.tw/dspace/handle/987654321/96124


    Title: Platform Deformation Phase Correction for the AMiBA-13 Coplanar Interferometer
    Authors: Liao, Yu-Wei;Lin, Kai-Yang;Huang, Yau-De;Wu, Jiun-Huei Proty;Ho, Paul T. P.;Chen, Ming-Tang;Huang, Chih-Wei Locutus;Patrick M. Koch;Hiroaki Nishioka;Cheng, Tai-An;Fu, Szu-Yuan;Liu, Guo-Chin;Sandor M. Molnar;Keiichi Umetsu;Fu-Cheng Wang;Chang, Yu-Yen;Han, Chih-Chiang;Li,Chao-Te;Pierre Martin-Cocher;Peter Oshiro
    Contributors: 淡江大學物理學系
    Keywords: instrumentation;interferometers
    Date: 2013-05-06
    Issue Date: 2014-03-03 11:53:51 (UTC+8)
    Publisher: Institute of Physics Publishing, Inc.
    Abstract: We present a new way to solve the platform deformation problem of coplanar interferometers. The platform of a coplanar interferometer can be deformed due to driving forces and gravity. A deformed platform will induce extra components into the geometric delay of each baseline and change the phases of observed visibilities. The reconstructed images will also be diluted due to the errors of the phases. The platform deformations of The Yuan-Tseh Lee Array for Microwave Background Anisotropy (AMiBA) were modeled based on photogrammetry data with about 20 mount pointing positions. We then used the differential optical pointing error between two optical telescopes to fit the model parameters in the entire horizontal coordinate space. With the platform deformation model, we can predict the errors of the geometric phase delays due to platform deformation with a given azimuth and elevation of the targets and calibrators. After correcting the phases of the radio point sources in the AMiBA interferometric data, we recover 50%-70% flux loss due to phase errors. This allows us to restore more than 90% of a source flux. The method outlined in this work is not only applicable to the correction of deformation for other coplanar telescopes but also to single-dish telescopes with deformation problems. This work also forms the basis of the upcoming science results of AMiBA-13.
    Relation: The Astrophysical Journal 769:71 (12 pages)
    DOI: 10.1088/0004-637X/769/1/71
    Appears in Collections:[Graduate Institute & Department of Physics] Journal Article

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