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25 May 2005 An emissivity imaging camera (eCAM) for evaluating changes in aircraft coatings
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Abstract
A midwave hand-held two-band infrared imager has been developed to measure the emissivity image of aircraft surfaces. Its purpose is to detect changes in IR surface properties of aircraft coatings. This system has been designed for use in field environments such as an aircraft carrier hangaer and other maintenance facilities where the object being measured is static and cooperative but the environment is not well controlled. It thus requires real time monitoring of the environmental reflections off the surface and algorithms to correct for this reflected radiance. This correction for the environment using calibrated paint patchescoupons is a novel feature of this new technology. The camera output includes two band radiance images, temperature images, and the novel emissivity imagery for which eCAM has been named. It has long been known that two-band infrared measurements can be used to optically determine temperature and solid angle-emissivity products of a greybody surface. This measurement becomes considerably more complex when the environmental foreground reflecting off the surface is a significant part of the infrared-based measurement. This paper will describes the theory behind making foreground- reflection- corrected emissivity image measurements. It will includes material on the calibration of the IR sensor and its specially designed optics and the custom emissivity calibrated patches that are an integral part of the design. It will also shows laboratory test results and field test data taken in an aircraft maintenance hangar.
© (2005) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
E. James Bevan, John DiDomenico, Mike Briggs, Curt Strom, and Bob Gedridge "An emissivity imaging camera (eCAM) for evaluating changes in aircraft coatings", Proc. SPIE 5811, Targets and Backgrounds XI: Characterization and Representation, (25 May 2005); https://doi.org/10.1117/12.606547
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