1 October 1990 Enhanced temporal resolution with a scanning imaging radiometer
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Abstract
The prcblem of a1iasir is catn to all video imagirg systems, both IR and visible. The 30 Hz frame rate (P5-170) places an upper lirait on frequency, so that repetitive enoiena that vary nore rapidly than 30 Hz will be aliased. For scenes where irvtion is involv1, the presence of aliasir is often thvious, as the ige will be distortel. Harever, when only teTrerature is varyirxj, the effects of aliasirx are difficult th detect. In fact, usir a conventional IR iitager, one cannot diStirUiSh whether a target is at thermal uilThrium, or its surface temperature is varTing faster than the fraite rate. We have develop1 a system which allcs repetitive thennal eventh at frequencies as high as 2 kllz to be flrg1 without aliasirx. The system functions as a video lock-in amplifier in that temperature caiponents of the scene which vary at a preselected frequency are anplifi&1, while other frequency ccaiponents of the target temperature average out over tine. A prototype unit, consisting of an unndified scanning imaging radiareter (Inframetrics IR-600), a E-T car!patible microcatputer, axxl specially developed interface hardware arxl software, has been built ard tested.
© (1990) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Steven M. Shepard, David T. Sass, Paul Kollmorgen, "Enhanced temporal resolution with a scanning imaging radiometer", Proc. SPIE 1309, Infrared Imaging Systems: Design, Analysis, Modeling, and Testing, (1 October 1990); doi: 10.1117/12.21772; https://doi.org/10.1117/12.21772
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