Abstract
The Système International base unit for photometry, the candela, has been
realized by using absolute detectors rather than absolute sources. This change
in method permits luminous intensity calibrations of standard lamps with an
expanded uncertainty of 0.46%, almost a factor-of-2 improvement. A group
of eight reference photometers has been constructed with silicon photodiodes,
matched with filters to mimic the Commission Internationale de
l’Éclairage spectral luminous efficiency function for photopic
vision. The design, characterization, calibration, evaluation, and further
application of the photometers are discussed.
© 1993 Optical Society of America
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