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Proceedings Paper

A spectrally tunable solid-state source for radiometric, photometric, and colorimetric applications
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Paper Abstract

A spectrally tunable light source using a large number of LEDs and an integrating sphere has been designed and being developed at NIST. The source is designed to have a capability of producing any spectral distributions mimicking various light sources in the visible region by feedback control of individual LEDs. The output spectral irradiance or radiance of the source will be calibrated by a reference instrument, and the source will be used as a spectroradiometric as well as photometric and colorimetric standard. The use of the tunable source mimicking spectra of display colors, for example, rather than a traditional incandescent standard lamp for calibration of colorimeters, can reduce the spectral mismatch errors of the colorimeter measuring displays significantly. A series of simulations have been conducted to predict the performance of the designed tunable source when used for calibration of colorimeters. The results indicate that the errors can be reduced by an order of magnitude compared with those when the colorimeters are calibrated against Illuminant A. Stray light errors of a spectroradiometer can also be effectively reduced by using the tunable source producing a blackbody spectrum at higher temperature (e.g., 9000 K). The source can also approximate various CIE daylight illuminants and common lamp spectral distributions for other photometric and colorimetric applications.

Paper Details

Date Published: 20 October 2004
PDF: 10 pages
Proc. SPIE 5530, Fourth International Conference on Solid State Lighting, (20 October 2004); doi: 10.1117/12.565053
Show Author Affiliations
Irena Fryc, Bialystok Technical Univ. (Poland)
National Institute of Standards and Technology (United States)
Steven W. Brown, National Institute of Standards and Technology (United States)
George P. Eppeldauer, National Institute of Standards and Technology (United States)
Yoshihiro Ohno, National Institute of Standards and Technology (United States)

Published in SPIE Proceedings Vol. 5530:
Fourth International Conference on Solid State Lighting
Ian T. Ferguson; Nadarajah Narendran; Steven P. DenBaars; John C. Carrano, Editor(s)

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