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Proceedings Paper

An Unheated Four-Bar Infrared Test Target
Author(s): F. O. Bartell; A. G. DeBell; B. B. Fannin; J. S. Nissley; W. L. Wolfe; C. M. Giorgi
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Paper Abstract

A four-bar infrared test target has been built to test the feasibility of using perforated ambient temperature plates for the four bars instead of the customary plates operated at temperatures different from ambient. Six different sizes of four-bar arrays provide six different spatial frequencies. Front and back arrays of perforated plates are moved relative to one another by a motor drive to expose more or less of a sky reflector backplate, thereby producing a varying apparent temperature differential between the bars and their interstices. The target system also features a radiometric monitor which mechanically servos the bar patterns to compensate for changes such as dust or clouds. Qualitative tests with infrared imaging systems show satisfactory bar patterns which disappear when the perforations are closed. Quantitative tests show that differential temperature accuracies of about one tenth of a kelvin can be attained.

Paper Details

Date Published: 9 November 1977
PDF: 7 pages
Proc. SPIE 0124, Modern Utilization of Infrared Technology III, (9 November 1977); doi: 10.1117/12.955860
Show Author Affiliations
F. O. Bartell, University of Arizona (United States)
A. G. DeBell, University of Arizona (United States)
B. B. Fannin, University of Arizona (United States)
J. S. Nissley, University of Arizona (United States)
W. L. Wolfe, University of Arizona (United States)
C. M. Giorgi, U. S. Army Electronic Proving Ground (United States)

Published in SPIE Proceedings Vol. 0124:
Modern Utilization of Infrared Technology III
Irving J. Spiro, Editor(s)

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