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1 June 1994 Atmospheric seeing measurements in the near-infrared
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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.
© (1994) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Colin M. Humphries, Eli Atad-Ettedgui, John W. Harris, A. M. Smillie, Colin Aspin, and Dolores M. Walther "Atmospheric seeing measurements in the near-infrared", Proc. SPIE 2199, Advanced Technology Optical Telescopes V, (1 June 1994);

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