Enhanced temporal resolution with a scanning imaging radiometer

Steven M. Shepard; David T. Sass; Paul Kollmorgen

doi:10.1117/12.21772

1 October 1990 Enhanced temporal resolution with a scanning imaging radiometer

Steven M. Shepard, David T. Sass, Paul Kollmorgen

Proceedings Volume 1309, Infrared Imaging Systems: Design, Analysis, Modeling, and Testing; (1990) https://doi.org/10.1117/12.21772
Event: 1990 Technical Symposium on Optics, Electro-Optics, and Sensors, 1990, Orlando, FL, United States

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.

Citation Download Citation

Steven M. Shepard, David T. Sass, and Paul Kollmorgen "Enhanced temporal resolution with a scanning imaging radiometer", Proc. SPIE 1309, Infrared Imaging Systems: Design, Analysis, Modeling, and Testing, (1 October 1990); https://doi.org/10.1117/12.21772

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