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Proceedings Paper

Use Of Aspherics And Colour Correcting Elements In The Thermal Infrared
Author(s): Bhadrayu M. Ranat
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Paper Abstract

This paper illustrates the use of modest aspheric surfaces and colour correcting elements made from materials other than germanium in cost effective optical designs for high performance thermal imagers. A number of optical design examples are given to show how aspheric surfaces and colour correcting elements are used to meet the space-volume requirements demanded by present day systems. The colour correcting materials considered are chalcogenide glasses, zinc selenide and zinc sulphide. The aspheric profile as measured from the best fit sphere departs by less than 15 micrometres and has local gradients less than one micrometre per millimetre of aperture. Such modest aspheric surfaces can be manufactured at relatively low cost on conventional lens polishing machines and can be easily tested using Newton fringes formed against a spherical test plate.

Paper Details

Date Published: 13 April 1989
PDF: 10 pages
Proc. SPIE 1013, Optical Design Methods, Applications and Large Optics, (13 April 1989); doi: 10.1117/12.949364
Show Author Affiliations
Bhadrayu M. Ranat, Barr & Stroud Ltd. (United Kingdom)


Published in SPIE Proceedings Vol. 1013:
Optical Design Methods, Applications and Large Optics
Andre Masson; Joachim J. Schulte-in-den-Baeumen; Hannfried Zuegge, Editor(s)

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