Physics – Optics
Scientific paper
Feb 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004apopt..43.1091p&link_type=abstract
Applied Optics, Volume 43, Issue 5, pp. 1091-1096 (2004).
Physics
Optics
Astronomical Telescopes, Light Interferometry, Mirrors, Adaptive Optics, Ccd Image Sensors
Scientific paper
In segmented-mirror telescopes, wave-front discontinuities caused by segment misalignment are a major problem because they severely degrade optical performance. While angular misalignments are usually measured with deflectometric wave-front sensors (e.g., Shack-Hartmann sensors), a number of techniques have been proposed for the measurement of vertical discontinuities (pistons). In earlier papers we presented an instrument called UPC-ZEBRA that uses a novel interferometric technique to measure piston error during the daytime with an uncertainty of 5 nm within a 30-μm range. Here we present the most representative results obtained during the testing stage and a detailed analysis of error sources. The main modifications to be introduced for the instrument's use as a phasing calibration system are also outlined.
Artigas Roger
Cadevall Cristina
Laguarta Ferran
Pinto Agusti
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