File:The NIST detector-based luminous intensity scale (IA jresv101n2p109).pdf
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[edit]The NIST detector-based luminous intensity scale
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Author |
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Title |
The NIST detector-based luminous intensity scale |
Volume | 101 |
Publisher |
National Institute of Standards and Technology |
Description |
Journal of Research of the National Institute of Standards and Technology Subjects: scale; calibration; candela; illuminance; lumen; photometer; lux |
Language | English |
Publication date |
March 1996 publication_date QS:P577,+1996-03-00T00:00:00Z/10 |
Current location |
IA Collections: NISTJournalofResearch; NISTresearchlibrary; fedlink; americana |
Accession number |
jresv101n2p109 |
Source | |
Permission (Reusing this file) |
The Journal of Research of the National Institute of Standards and Technology is a publication of the U.S. Government. The papers are in the public domain and are not subject to copyright in the United States. However, please pay special attention to the individual works to make sure there are no copyright restrictions indicated. Individual works may require securing other permissions from the original copyright holder. |
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Short title | The NIST detector-based luminous intensity scale |
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Image title | The Systeme International des Unites (SI) 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 to be carried out with a relative expanded uncertainty (coverage factor k = 2, and thus a 2 standard deviation estimate) of 0.46%, almost a factor-of-two improvement. A group of eight reference photometers has been constructed with silicon photodiodes, matched with filters to mimic the spectral luminous efficiency function for photopic vision. The wide dynamic range of the photometers aid in their calibration. The components of the photometers were carefully measured and selected to reduce the sources of error and to provide baseline data for aging studies. Periodic remeasurement of the photometers indicate that a yearly recalibration is required. The design, characterization, calibration, evaluation, and application of the photometers are discussed. |
Author | Cromer, C.L. |
Keywords |
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Software used | LuraDocument PDF Compressor Server 5.6.64.44 |
Conversion program | LuraDocument PDF v2.44 |
Encrypted | no |
Page size | 576 x 756 pts |
Version of PDF format | 1.4 |