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Proceedings Paper

DIMMWIT: comparing atmospheric seeing values measured by a differential image motion monitor, which is transportable, and COAST
Author(s): Bridget O'Donovan; John S. Young; Peter J. Warner; David F. Buscher; Donald M. A. Wilson; Roger C. Boysen; E. B. Seneta; James Keen
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Paper Abstract

The Cambridge DIMMWIT was developed for the site of COAST (the Cambridge Optical Aperture Synthesis Telescope), a prototype optical interferometer. Unlike other differential image motion monitors, this design is portable in order to carry out seeing campaigns at the site of any optical inteferometer. Of particular interest is the site of a second-generation interferometer proposed by the MRO (Magdalena Ridge Observatory) consortium. The DIMMWIT design has two objectives: to measure the Fried parameter r0 and the speckle lifetime tau0, and to be easily transportable. Here, we outline the theory of differential image motion, the design of the DIMMWIT, describe how turbulence parameters can be measured with COAST, and compare measurements of the seeing conditions made simultaneously by the monitor and COAST.

Paper Details

Date Published: 21 February 2003
PDF: 9 pages
Proc. SPIE 4838, Interferometry for Optical Astronomy II, (21 February 2003); doi: 10.1117/12.459761
Show Author Affiliations
Bridget O'Donovan, Cavendish Lab./Univ. of Cambridge (United Kingdom)
John S. Young, Cavendish Lab./Univ. of Cambridge (United Kingdom)
Peter J. Warner, Cavendish Lab./Univ. of Cambridge (United Kingdom)
David F. Buscher, Cavendish Lab./Univ. of Cambridge (United Kingdom)
Donald M. A. Wilson, Cavendish Lab./Univ. of Cambridge (United Kingdom)
Roger C. Boysen, Cavendish Lab./Univ. of Cambridge (United Kingdom)
E. B. Seneta, Cavendish Lab./ Univ. of Cambridge (United Kingdom)
James Keen, Cavendish Lab./Univ. of Cambridge (United Kingdom)

Published in SPIE Proceedings Vol. 4838:
Interferometry for Optical Astronomy II
Wesley A. Traub, Editor(s)

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