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Optical Engineering

Optical designs for the Rosetta narrow-angle camera
Author(s): Kjetil Dohlen; Michel Saisse; Genevieve Claeysen; Philippe L. Lamy; Jean-Lucien Boit
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Paper Abstract

Optical designs for the Rosetta narrow-angle camera (NAC) and its UV spectrograph are presented. The NAC requires a 600 mm focal length system of focal ratio f/7 imaging a square field of width 2.3 deg onto a square detector array 2048 pixels wide. A cartographic method has been used to search for flat-field, three-mirror anastigmats (TMA) with the required geometrical constraints and at least one spherical surface; the use of spherical surfaces reduces fabrication cost and complexity and facilitates alignment. Two such systems are described, one with a spherical secondary, the other with a spherical tertiary. A deterministic alignment method is outlined where alignment defects are calculated from measurements of image position and Zernike wavefront coefficients. For the spectrograph, an all-reflecting, Thevenin-type concentric spectrograph has been designed. This design offers excellent image quality both spectrally and spatially along a long slit and it is compact and easily accommodated.

Paper Details

Date Published: 1 April 1996
PDF: 8 pages
Opt. Eng. 35(4) doi: 10.1117/1.600710
Published in: Optical Engineering Volume 35, Issue 4
Show Author Affiliations
Kjetil Dohlen, Mr. Michel Saisse (France)
Michel Saisse, Lab. d'Astronomie Spatiale (France)
Genevieve Claeysen, CNRS (France)
Philippe L. Lamy, CNRS (France)
Jean-Lucien Boit, Lab. d'Astronomie Spatiale (France)


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