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Proceedings Paper

Liquid mirror telescopes: a progress report
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Paper Abstract

We review the status of the liquid mirror project. Interferometric tests of a f/1.2 2.5-m diameter liquid mirror carried out with a scatterplate interferometer show Strehl ratios of order 0.6, close to the value of 0.8 usually taken to signify that diffraction limit has been reached. The mirror is certainly better than implied by the data because the interferograms were taken with 1/500 second exposures and the wavefronts therefore include the effects of seeing in the testing tower. Correctable small variations of the rotational velocity account for another substantial fraction of the deviations from a parabola. We have videotaped hours of interferogram and PSF observations that show that those we analyze are representative.

Paper Details

Date Published: 1 June 1994
PDF: 8 pages
Proc. SPIE 2199, Advanced Technology Optical Telescopes V, (1 June 1994); doi: 10.1117/12.176218
Show Author Affiliations
Ermanno F. Borra, Univ. Laval (Canada)
Luc Girard, Univ. Laval (Canada)
Gilberto Moretto, Univ. Laval (Canada)
Min Wang, Univ. Laval (Canada)
Gregoire Tremblay, Univ. Laval (Canada)
Gerard R. Lemaitre, Observatoire de Marseille (France)

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

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