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NIST Authors in Bold
|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|
|Dates:||June 25-July 2, 2003|