Development of the Multi-configuration Cassegrain Collimator
Abstract
A multi-configuration collimator is designed to
test high precision optical instruments. Satellite imagers and solar
concentrators are main candidates to be tested with this collimator. By using
different measurement configurations, errors from a single test setup can be
avoided. The performance of the collimator must be better than the equipment to
be tested. This necessity requires the development of a highly precise
instrument with a stable mechanical structure and high quality optical
components. During polishing and metrology of optical mirrors, repeatability is
obtained by the application of opto-mechanical principles to the mirror
holders. Finite element analyses are performed to simulate gravity induced
deformations, assembly tolerances and thermal variations. To understand the
disturbances to the ideal WFE, variations are imported to optical software
environment with the help of Zernike polynomials. In the production phase,
surface qualities of the mirrors are measured by using computer generated
holograms and an interferometric setup. Design, manufacturing and integration
of the collimator are explained in detail.
Keywords
References
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Details
Primary Language
English
Subjects
-
Journal Section
Research Article
Publication Date
December 24, 2018
Submission Date
May 17, 2018
Acceptance Date
December 4, 2018
Published in Issue
Year 1970 Volume: 39 Number: 4