Share Email Print

Proceedings Paper

Image quality tests on the Canarias InfraRed Camera Experiment (CIRCE)
Format Member Price Non-Member Price
PDF $17.00 $21.00

Paper Abstract

In this paper we present the results of image quality tests performed on the optical system of the Canarias InfraRed Camera Experiment (CIRCE), a visitor-class near-IR imager, spectrograph, and polarimeter for the 10.4 meter Gran Telescopio Canarias (GTC). The CIRCE optical system is comprised of eight gold-coated aluminum alloy 6061 mirrors. We present surface roughness analysis of each individual component as well as optical quality of the whole system. We found all individual mirror surface roughness are within specifications except Fold mirrors 1 and 2. We plan to have these components re-cut and re-coated. We used a flat 0.2-arcseconds pinhole mask placed in the focal plane of the telescope to perform the optical quality tests of the system. The pinhole mask covers the entire field of view of the instrument. The resulting image quality allows seeing-limited performance down to seeing of 0.3 arcseconds FWHM. We also observed that our optical system produces a negative field curvature, which compensates the field curvature of the Ritchey-Chretien GTC design once the instrument is on the telescope.

Paper Details

Date Published: 24 September 2012
PDF: 7 pages
Proc. SPIE 8446, Ground-based and Airborne Instrumentation for Astronomy IV, 84462M (24 September 2012);
Show Author Affiliations
Nestor M. Lasso Cabrera, Univ. of Florida (United States)
Stephen S. Eikenberry, Univ. of Florida (United States)
Alan Garner, Univ. of Florida (United States)
S. Nicholas Raines, Univ. of Florida (United States)
Miguel V. Charcos-Llorens, Universities Space Research Association (United States)
Michelle L. Edwards, LBT Observatory, Univ. of Arizona (Chile)
Antonio Marin-Franch, Ctr. de Estudios de Física del Cosmos de Aragón (Spain)

Published in SPIE Proceedings Vol. 8446:
Ground-based and Airborne Instrumentation for Astronomy IV
Ian S. McLean; Suzanne K. Ramsay; Hideki Takami, Editor(s)

© SPIE. Terms of Use
Back to Top
Sign in to read the full article
Create a free SPIE account to get access to
premium articles and original research
Forgot your username?