Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008spie.7014e..67h&link_type=abstract
Ground-based and Airborne Instrumentation for Astronomy II. Edited by McLean, Ian S.; Casali, Mark M. Proceedings of the SPI
Astronomy and Astrophysics
Astronomy
Scientific paper
Traditional dome flat fielding methods typically have difficulties providing spatially uniform illumination and adequate flux over a telescopic instrument's entire spectral range. Traditional flat fielding screens, with an illumination source at least the size of the primary, can be difficult or impractical to mount and uniformly illuminate. The Las Cumbres Observatory Global Telescope Network (LCOGTN) will consist of approximately 50 robotic telescopes of 0.4 m, 1.0 m, and 2.0 m apertures with instrument bandwidth ranging from 350 - 1800 nm. The network requires a robust flat-field solution to fit in compact enclosures. A scanning illuminated flat fielding bar, Lambert, was developed to meet these requirements. Illumination is from a linear arrangement of sources that are spatially dispersed by a narrow holographic or glass diffuser equal in length to the primary's diameter. We have investigated a linearly scanning, enclosure mounted, deployable unit, and a rotary scanning, telescope mounted unit. For complete visible-light bandwidth, a set of different color LEDs is used. The source density, scan speed, and variable intensity tunes the flux to the instrument wavelength and bandwidth. The Lambert flat fields in comparison to sky flats match pixel to pixel variations better than 0.5%; large scale illumination differences, which are stable and repeatable, are ~1%.
Dubberley Matthew A.
Haldeman Benjamin J.
Hidas Marton G.
Posner Vincent
Tufts Joseph R.
No associations
LandOfFree
Lambert: a novel compact calibration solution for superior telescope flat fielding does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Lambert: a novel compact calibration solution for superior telescope flat fielding, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Lambert: a novel compact calibration solution for superior telescope flat fielding will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1058987