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Proceedings Paper

Comparison of optomechanical and focal plane array methods for enhanced temporal resolution
Author(s): Steven M. Shepard; Thomas P. Imirowicz; David T. Sass
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Paper Abstract

Temporal aliasing is a problem common to all video imaging systems. Infrared video systems are particularly susceptible because of the relatively low (30 Hz) RS-170 frame rate. We have developed two systems which compensate for the effects of aliasing, and allow above-frame- rate events to be imaged. An optomechanically based system utilizes an unmodified commercial imager (Inframetrics IR 600) and allows images of repetitive thermal events at frequencies up to 4 kHz to be acquired. It acquires data selectively using a line-by-line scheme which compares the motion of the camera's horizontal scanning mirror to a reference signal correlated to the event of interest. The resulting images have an effective integration time of 125 microseconds. The focal plane array system is based on a 160 X 244 PtSi detector operating at the standard 30 Hz frame rate. Frame integration time is variable to a minimum of 100 microseconds. Data can be acquired synchronously with respect to an external reference signal derived from the target. The systems will be compared, and relative merits of each will be discussed.

Paper Details

Date Published: 1 April 1992
PDF: 7 pages
Proc. SPIE 1682, Thermosense XIV: An Intl Conf on Thermal Sensing and Imaging Diagnostic Applications, (1 April 1992); doi: 10.1117/12.58547
Show Author Affiliations
Steven M. Shepard, U.S. Army Tank-Automotive Command (United States)
Thomas P. Imirowicz, U.S. Army Tank-Automotive Command (United States)
David T. Sass, U.S. Army Tank-Automotive Command (United States)

Published in SPIE Proceedings Vol. 1682:
Thermosense XIV: An Intl Conf on Thermal Sensing and Imaging Diagnostic Applications
Jan K. Eklund, Editor(s)

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