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- W2000919672 abstract "view Abstract Citations (18) References (10) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Optical Shop Tests of a f/1.2 2.5 Meter Diameter Liquid Mirror Borra, E. F. ; Content, R. ; Girard, L. Abstract We report the results of optical tests of a f/1.2 2.5 m diameter liquid mirror. Interferometric tests carried out with a scatterplate interferometer show rms surface deviation values of ∼λ/20 and Strehl ratios of order 0.7, 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 1/30 s exposures and the wave- fronts therefore include the effects of seeing in the testing tower. We have imaged an artificial star and observed the diffraction pattern of the telescope, in agreement with the results of the interferometry. We have videotaped hours of interferogram and PSF (point-spread function) observations that show that those that we present are representative. Direct observations of the PSF show that the mirror does not suffer an excessive amount of scattered light. With the demonstration of this mirror, we have reached a significant milestone since a 2.5 m diameter is a world-class size and success with such a fast system all but guarantees that a slower 4 m mirror should be feasible. Publication: The Astrophysical Journal Pub Date: December 1993 DOI: 10.1086/173451 Bibcode: 1993ApJ...418..943B Keywords: INSTRUMENTATION: MISCELLANEOUS; TECHNIQUES: INTERFEROMETRIC; TELESCOPES full text sources ADS |" @default.
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- W2000919672 date "1993-12-01" @default.
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- W2000919672 title "Optical Shop Tests of a f/1.2 2.5 Meter Diameter Liquid Mirror" @default.
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