Accession Number : ADA495933

Title :   A Comparative Study of the Bidirectional Reflectance Distribution Function of Several Surfaces as a Mid-wave Infrared Diffuse Reflectance Standard

Descriptive Note : Master's thesis

Corporate Author : AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH GRADUATE SCHOOL OF ENGINEERING AND MANAGEMENT

Personal Author(s) : Balling, Bradley

PDF Url : ADA495933

Report Date : MAR 2009

Pagination or Media Count : 198

Abstract : The Bi-Directional Reflectance Distribution Function (BRDF) has a well defined diffuse measurement standard in the ultraviolet, visible, and near infrared (NIR), Spectralon(trade name). It is predictable, stable, repeatable, and has low surface variation because it is a bulk scatterer. In the mid-wave IR (MWIR) and long-wave IR (LWIR), there is not such a well-defined standard. There are well-defined directional hemispherical reflectance (DHR) standards, but the process of integrating BRDF measurements into DHR for the purpose of calibration is problematic, at best. Direct BRDF measurement standards are needed. This study use current calibration techniques to ensure valid measurements and then systematically investigates the BRDF and its variation for eight potential MWIR diffuse BRDF standards. Diffuseness, repeatability, and reflectance are all considered as required parameters necessary for a di use MWIR BRDF standard. This document shows comparatively that Spectralon is an excellent candidate for a diffuse MWIR BRDF standard.

Descriptors :   *REFLECTANCE, *DISTRIBUTION FUNCTIONS, VARIATIONS, CALIBRATION, DIFFUSION, ELECTROPLATING, ULTRAVIOLET RADIATION, NEAR INFRARED RADIATION, TWO WAY TRANSMISSION, THESES, HEMISPHERES

Subject Categories : Statistics and Probability
      Electricity and Magnetism

Distribution Statement : APPROVED FOR PUBLIC RELEASE