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Proceedings Paper

An emissivity imaging camera (eCAM) for evaluating changes in aircraft coatings
Author(s): E. James Bevan; John DiDomenico; Mike Briggs; Curt Strom; Bob Gedridge
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Paper 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.

Paper Details

Date Published: 25 May 2005
PDF: 11 pages
Proc. SPIE 5811, Targets and Backgrounds XI: Characterization and Representation, (25 May 2005); doi: 10.1117/12.606547
Show Author Affiliations
E. James Bevan, Millennium Engineering and Integration Co. (United States)
John DiDomenico, Millennium Engineering and Integration Co. (United States)
Mike Briggs, Millennium Engineering and Integration Co. (United States)
Curt Strom, Millennium Engineering and Integration Co. (United States)
Bob Gedridge, Naval Air Warfare Ctr. (United States)

Published in SPIE Proceedings Vol. 5811:
Targets and Backgrounds XI: Characterization and Representation
Wendell R. Watkins; Dieter Clement; William R. Reynolds, Editor(s)

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