Abstract

Currently, photometric standards are calibrated only at CIE-recommended geometries. A need exists for calibrating at many combinations of illumination and viewing angles. The common practice is to assume BaSO4 is lambertian although its non-Iambertian behavior is well-known. Accordingly, a study was undertaken to develop a standard for this type of metrology. Two diffuse materials, BaSO4 and PTFE, were characterized goniospectrophotometrically. PTFE, when pressed to a density of 1.55g/cc against a lapping film, exhibited properties lending itself as a transfer standard. Bidirectional absolute spectral reflectance factors at 60 combinations of illumination and viewing angles in a single plane were measured. Neither material was found to be lambertian and both polarized the reflected radiation. The PTFE standard had greater spectral non-selectivity and could be prepared repeatably.

Library of Congress Subject Headings

Spectrophotometry--Technique--Standards; Angles (Geometry)--Measurement--Technique--Standards; Reflectance; Colorimetry--Standards

Publication Date

1-1987

Document Type

Thesis

Student Type

Graduate

Advisor

Roy Berns

Advisor/Committee Member

R. Easton

Advisor/Committee Member

Mark D. Fairchild

Comments

Physical copy available from RIT's Wallace Library at QD272.S57 D36 1987

Campus

RIT – Main Campus

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