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Since 2004, AFIT has been developing a trend-analysis tool to assess large com-mercial aircraft infrared (LCAIR) signatures. In many cases, this code predictedsignatures to within 10% of measured data. However, other results indicated that thesingle-bounce, specular-re-ection algorithm being used failed to adequately simulateinteractions between aircraft parts where either the specular component is dominatedby di use re-ection or part-to-part multiple-bounce re-ections contribute signi cantlyto the signature; discrepancies greater than 100% were observed. This research in-corporates Bi-Directional Re-ectance Distribution Functions (BRDF’s) and multiple-bounce calculations into the LCAIR model.A physical aircraft model was constructed from aluminum, and measurementswere taken before and after a surface treatment in gloss black paint. The Sandford-Robertson model is used to parameterize the BRDF’s of both the bare aluminum andgloss black paint. Since the most e cient method of integrating a BRDF dependsupon the re-ectance distribution of the aircraft material, the sampling resolution ofthe BRDF integral is crucial to an accurate simulation.This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it. This work was reproduced from the original artifact, and remains as true to the original work as possible. Therefore, you will see the original copyright references, library stamps (as most of these works have been housed in our most important libraries around the world), and other notations in the work.This work is in the public domain in the United States of America, and possibly other nations. Within the United States, you may freely copy and distribute this work, as no entity (individual or corporate) has a copyright on the body of the work.As a reproduction of a historical artifact, this work may contain missing or blurred pages, poor pictures, errant marks, etc. Scholars believe, and we concur, that this work is important enough to be preserved, reproduced, and made generally available to the public. We appreciate your support of the preservation process, and thank you for being an important part of keeping this knowledge alive and relevant.
