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Proceedings Paper

Measurement Of Magnification Of IR Telescopes
Author(s): J Peter Jennings; F J Busselle; Clive R Foster; Sarah Rose; Steven G Shaw
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Paper Abstract

The measurement of the magnification factor of infra-red or thermal band afocal telescopes to high accuracy may not be as easy as it might at first seem. One may need to carry out this measurement to an accuracy of 1% or better for systems, for example, where dual band overlay is required (eg a thermal display superimposed on the same scene viewed in the visual band). This paper describes some of the methods and experiments that we have carried out in an attempt to measure magnification to a target accuracy of 0.1%. These are for telescopes designed for a scanning thermal imaging system working in the 8-12um spectral region. Measurements are presented here only for a nominal X3 telescope, but in addition we have made measurements on others of larger magnification.

Paper Details

Date Published: 10 September 1987
PDF: 8 pages
Proc. SPIE 0807, Passive Infrared Systems and Technology, (10 September 1987); doi: 10.1117/12.941447
Show Author Affiliations
J Peter Jennings, Royal Armament Research & Development Establishment (United Kingdom)
F J Busselle, Royal Armament Research & Development Establishment (United Kingdom)
Clive R Foster, Royal Armament Research & Development Establishment (United Kingdom)
Sarah Rose, Royal Armament Research & Development Establishment (United Kingdom)
Steven G Shaw, Royal Armament Research & Development Establishment (United Kingdom)


Published in SPIE Proceedings Vol. 0807:
Passive Infrared Systems and Technology
H. M. Lamberton, Editor(s)

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