Use of aspherics and colour correcting elements in the thermal infrared.

Details Use of aspherics and colour correcting elements in the thermal infrared. Use of aspherics and colour correcting elements in the thermal infrared.

Apr 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989spie.1013...74r&link_type=abstract

Conference on Optical Design Methods, Applications, and Large Optics in Conjunction with the 1. International Congress on Optica

Physics

Optics

Optical Design

Scientific paper

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 aspheric profile as measured from the best fit sphere departs by less than 15 μm and has local gradients less than 1 μm per mm 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.

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