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Proceedings Paper

Temperature-Invariant And Other Narrow-Band IR Filters Containing PbTe, 4-20um
Author(s): J. S. Seeley; R. Hunneman; A. Whatley
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Paper Abstract

PbTe is unique amongst coating materials because of its negative temperature coefficient of refractive index. In combination with a conventional II-VII) material it can confer immunity to temperature variation from at least -23oC to +110oC for a narrowband filter. It also has an absolutely large refractive index so that filters are attainable with minimal degradation when tilted, and a minimum number of layers overall particularly towards 20 µm. Excellent transmission can be obtained.

Paper Details

Date Published: 3 December 1980
PDF: 13 pages
Proc. SPIE 0246, Contemporary Infrared Sensors and Instruments, (3 December 1980); doi: 10.1117/12.959359
Show Author Affiliations
J. S. Seeley, University of Reading 3 (England)
R. Hunneman, University of Reading 3 (England)
A. Whatley, University of Reading 3 (England)


Published in SPIE Proceedings Vol. 0246:
Contemporary Infrared Sensors and Instruments
Herbert Kaplan; Frederic M. Zweibaum, Editor(s)

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