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Proceedings Paper

Passively athermalized hybrid objective for a far-infrared uncooled thermal imager
Author(s): Andrew P. Wood; L. Lewell; Paul Antony Manning; Paul P. Donohue
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Paper Abstract

The development of a Petzval objective lens which is passively athermalized over the temperature range minus 20 degrees Celsius to plus 50 degrees Celsius is described. The lens is compatible with a latest generation uncooled staring array imager operating in the far infrared band, currently under development at the UK Defence Research Agency (DRA). In order to minimize the number of lens components which are required, a diamond turned hybrid refractive-diffractive element is employed. Design options are presented and the manufacturing issues relating to the diffractive surface are described. The goal is to produce a cost effective solution rather than placing the emphasis on achieving the ultimate in performance. Results from optical performance tests are given, including interferometry at a range of temperatures and broadband MTF.

Paper Details

Date Published: 27 June 1996
PDF: 10 pages
Proc. SPIE 2744, Infrared Technology and Applications XXII, (27 June 1996); doi: 10.1117/12.243490
Show Author Affiliations
Andrew P. Wood, Precision-Optical Engineering (United Kingdom)
L. Lewell, Precision-Optical Engineering (United Kingdom)
Paul Antony Manning, Defence Research Agency Malvern (United Kingdom)
Paul P. Donohue, Defence Research Agency Malvern (United Kingdom)

Published in SPIE Proceedings Vol. 2744:
Infrared Technology and Applications XXII
Bjorn F. Andresen; Marija S. Scholl, Editor(s)

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