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Proceedings Paper

Calibration of the Boltwood Cloud Sensor
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Paper Abstract

The commercially-available Boltwood Cloud Sensor couples a sky-facing non-imaging thermopile operating in the 8-14 micron range with an ambient air thermometer, to determine the relative sky temperature, and thus indicate the presence of cloud. A Boltwood sensor was installed on the Liverpool Telescope's weather mast on La Palma in the Canary Islands in September 2006 in order to investigate its response to both thick and thin cloud at both low and high (cirrus) levels. An additional aim was to investigate the detectability of calima (Saharan dust) that is occasionally blown over the islands. In this paper we present the results of our investigations, presenting correlations between the observed temperature differential and photometricity as determined from the observation of photometric standard stars, and give some useful "rules-of-thumb" for others considering using such devices.

Paper Details

Date Published: 10 July 2008
PDF: 12 pages
Proc. SPIE 7012, Ground-based and Airborne Telescopes II, 70123U (10 July 2008); doi: 10.1117/12.789072
Show Author Affiliations
Jonathan Marchant, Astrophysics Research Institute, Liverpool John Moores Univ. (United Kingdom)
Robert J. Smith, Astrophysics Research Institute, Liverpool John Moores Univ. (United Kingdom)
Iain A. Steele, Astrophysics Research Institute, Liverpool John Moores Univ. (United Kingdom)


Published in SPIE Proceedings Vol. 7012:
Ground-based and Airborne Telescopes II
Larry M. Stepp; Roberto Gilmozzi, Editor(s)

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