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  • Open Daily: 10am - 10pm
    Alley-side Pickup: 10am - 7pm

    3038 Hennepin Ave Minneapolis, MN
    612-822-4611

Open Daily: 10am - 10pm | Alley-side Pickup: 10am - 7pm
3038 Hennepin Ave Minneapolis, MN
612-822-4611
A Study of Bi-Directional Reflectance Distribution Functions and Their Effect on Infrared Signature Models

A Study of Bi-Directional Reflectance Distribution Functions and Their Effect on Infrared Signature Models

Harkiss, Samuel I.

Paperback

Technology & EngineeringGeneral EducationPhysics

ISBN10: 1249832101
ISBN13: 9781249832102
Publisher: Biblioscholar
Published: Oct 17 2012
Pages: 154
Weight: 0.50
Height: 0.33 Width: 6.14 Depth: 9.21
Language: English

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.

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