Errors In Passive Infrared Imaging Systems Due To Reflected Ambient Flux

Joseph C. Richmond

doi:10.1117/12.958728

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24 June 1980 Errors In Passive Infrared Imaging Systems Due To Reflected Ambient Flux

Joseph C. Richmond

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Proceedings Volume 0226, Infrared Imaging Systems Technology; (1980) https://doi.org/10.1117/12.958728
Event: 1980 Technical Symposium East, 1980, Washington, D.C., United States

Abstract

Passive infrared imaging systems produce a signal in which the amplitude at a particular spot is related to the radiance of the corresponding spot in the scene viewed. The differences in signal levels in different areas of the image is usually interpreted in terms of radiance temperature differences in the scene viewed, and may be converted to true radiance temperatures if the scene includes an object whose radiance temperature is known. The radiance temperatures are usually converted to true temperatures by correcting for the emittance of objects in the scene. This would be correct in the absence of reflected ambient flux. However, for scenes at ambient temperatures, ambient flux is always present in significant amounts. Temperature errors due to reflected ambient flux are discussed from a theoretical standpoint, and a procedure for experimentally evaluating the ambient flux is suggested.

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Joseph C. Richmond "Errors In Passive Infrared Imaging Systems Due To Reflected Ambient Flux", Proc. SPIE 0226, Infrared Imaging Systems Technology, (24 June 1980); https://doi.org/10.1117/12.958728

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