9 November 1977 An Unheated Four-Bar Infrared Test Target
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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.
© (1977) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
F. O. Bartell, F. O. Bartell, A. G. DeBell, A. G. DeBell, B. B. Fannin, B. B. Fannin, J. S. Nissley, J. S. Nissley, W. L. Wolfe, W. L. Wolfe, C. M. Giorgi, C. M. Giorgi, } "An Unheated Four-Bar Infrared Test Target", Proc. SPIE 0124, Modern Utilization of Infrared Technology III, (9 November 1977); doi: 10.1117/12.955860; https://doi.org/10.1117/12.955860

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