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Proceedings Paper

Atmospheric seeing measurements in the near infrared
Author(s): Colin M. Humphries; Eli Atad-Ettedgui; John W. Harris; A. M. Smillie; Colin Aspin; Dolores M. Walther
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Paper Abstract

Wavefront tilt variances have been measured directly at near infrared wavelengths with the IRCAM camera at the UK Infrared Telescope. Single aperture and differential tilt variances were obtain in the J (1.228 micrometers ), H (1.643 micrometers ), K (2.182 micrometers ) and L (3.42 micrometers ) photometric passbands using Hartmann masks containing, respectively, four and eight subapertures at a re- imaged pupil. Sampling runs at each wavelength comprised 200 short exposures taken over periods of about 35 seconds. The results have been analyzed by separating the effects of local (dome and telescope) seeing and telescope drive errors or wind shake from those of the external atmosphere. Although the measured wavefront tilt variances included contributions from these various sources, instead of the free atmosphere alone, in practice these are what currently limit the imaging performance of most astronomical telescopes at visible and infrared wavelengths.

Paper Details

Date Published: 1 June 1994
PDF: 7 pages
Proc. SPIE 2199, Advanced Technology Optical Telescopes V, (1 June 1994); doi: 10.1117/12.176242
Show Author Affiliations
Colin M. Humphries, Royal Observatory Edinburgh (United Kingdom)
Eli Atad-Ettedgui, Royal Observatory Edinburgh (United Kingdom)
John W. Harris, Royal Observatory Edinburgh (United Kingdom)
A. M. Smillie, Royal Observatory Edinburgh (United Kingdom)
Colin Aspin, Joint Astronomy Ctr. (United States)
Dolores M. Walther, Joint Astronomy Ctr. (United States)

Published in SPIE Proceedings Vol. 2199:
Advanced Technology Optical Telescopes V
Larry M. Stepp, Editor(s)

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