DIMMWIT: comparing atmospheric seeing values measured by a differential image motion monitor, which is transportable, and COAST

Bridget O'Donovan; John S. Young; Peter J. Warner; David F. Buscher; Donald M. A. Wilson; Roger C. Boysen; E. B. Seneta; James Keen

doi:10.1117/12.459761

21 February 2003 DIMMWIT: comparing atmospheric seeing values measured by a differential image motion monitor, which is transportable, and COAST

Bridget O'Donovan, John S. Young, Peter J. Warner, David F. Buscher, Donald M. A. Wilson, Roger C. Boysen, E. B. Seneta, James Keen

Author Affiliations +

Proceedings Volume 4838, Interferometry for Optical Astronomy II; (2003) https://doi.org/10.1117/12.459761
Event: Astronomical Telescopes and Instrumentation, 2002, Waikoloa, Hawai'i, United States

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.

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Bridget O'Donovan, John S. Young, Peter J. Warner, David F. Buscher, Donald M. A. Wilson, Roger C. Boysen, E. B. Seneta, and James Keen "DIMMWIT: comparing atmospheric seeing values measured by a differential image motion monitor, which is transportable, and COAST", Proc. SPIE 4838, Interferometry for Optical Astronomy II, (21 February 2003); https://doi.org/10.1117/12.459761

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