Testing process for the WEAVE prime focus corrector lenses for the William Herschel Telescope - Observatoire de Paris Accéder directement au contenu
Communication Dans Un Congrès Année : 2018

Testing process for the WEAVE prime focus corrector lenses for the William Herschel Telescope

Dijana Bogunovic
  • Fonction : Auteur
Graeme Jonas
  • Fonction : Auteur
Dave Cochrane
  • Fonction : Auteur
Andrew Rakich
  • Fonction : Auteur
Peter Connor
  • Fonction : Auteur
Abe Romeril
  • Fonction : Auteur
Jimi Romeril
  • Fonction : Auteur
Luke Gers
  • Fonction : Auteur
Eleanor Howick
  • Fonction : Auteur
Chris Young
  • Fonction : Auteur
Tony Reed
  • Fonction : Auteur
Ian Tosh
  • Fonction : Auteur
Émilie Lhomé
  • Fonction : Auteur
Kevin M. Dee
  • Fonction : Auteur
Gavin Dalton
  • Fonction : Auteur
Scott Trager
  • Fonction : Auteur
Jose Alfonso Lopez Aguerri
  • Fonction : Auteur
Antonella Vallenari
  • Fonction : Auteur
Esperanza Carrasco
  • Fonction : Auteur
Don Carlos Abrams
  • Fonction : Auteur
Kevin Middleton
  • Fonction : Auteur

Résumé

A new prime focus corrector for the WEAVE project for the William Herschel Telescope is being produced. The corrector consists of six lens elements, the largest being 1.1 m in diameter. It also incorporates an Atmospheric Dispersion Corrector. Testing procedures for the WEAVE prime focus corrector lens elements are described here. Critical issues encountered in practice, including the influence of the lens size, wedge and weight on the testing procedure are discussed. Due to large lens dimensions, a dedicated test tower and lens support system has been developed to measure the optical surface form errors of the concave surfaces and the transmitted wavefront of each lens. For some of the lens elements, sub-aperture measurements have been performed using an off-axis Hindle sphere and the resultant OPD maps have been stitched together. The challenge of testing a wedged lens with a combination of a long radius convex surface and a short radius concave surface has been resolved by using another lens from the system as an auxiliary lens. The practice of testing convex surfaces via internal reflection/transmission through the lens element has been avoided entirely in this case and some discussion justifying the choices of metrology approach taken is given. The fabrication and acceptance testing of the lens elements has been completed within the expected time and budget, and all elements have been shown to meet requirements.

Dates et versions

obspm-04072890 , version 1 (18-04-2023)

Identifiants

Citer

Dijana Bogunovic, Graeme Jonas, Dave Cochrane, Andrew Rakich, Peter Connor, et al.. Testing process for the WEAVE prime focus corrector lenses for the William Herschel Telescope. Proceedings of the SPIE, 2018, à renseigner, Unknown Region. ⟨10.1117/12.2312342⟩. ⟨obspm-04072890⟩
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