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Publication Citation: Absolute Alignment of the Reference Retroreflectometer at NIST

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Author(s): Carl C. Miller;
Title: Absolute Alignment of the Reference Retroreflectometer at NIST
Published: June 01, 2003
Abstract: The National Cooperative Highway Research Program (NCHRP Project 05-16) awarded The National Institute of Standards and Technology (NIST) a contract to develop a dedicated reference instrument for measuring retroreflective materials, and a calibration program that provides traceability to the relevant national scales maintained by NIST. The most critical aspect of the NIST Reference Retroreflectometer is the absolute alignment of the three components: thesource, the goniometer, and the detector. Presented are the methods for aligning the components and the uncertainty of the four angles defined as the CIE goniometer system. The expanded uncertainty (k=2) for the observation angle, alpha, is 0,00057 ; for the entrance angle components, beta 1 and beta 2, is 0,0090 ; and for the rotation angle, epsilon, is 0,061 .
Conference: Publications Commission Internationale De L'Eclairage CIE
Proceedings: Commission Internationale de L'eclairage | 25th | | CIE
Volume: 152
Dates: June 25-July 2, 2003
Keywords: calibration standard;retroreflection;retroreflectometer;uncertainty
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