Spectrally tunable solid-state light source
First Claim
1. A spectrally tunable solid-state source comprising:
- an integrating sphere having a plurality of ports;
a plurality of individually controllable solid-state illumination sources with different spectral distributions mounted on the integrating sphere at a plurality of said ports so as to direct radiation into the sphere such that the integrating sphere integrates said spectral distributions and produces integrated radiation based thereon;
output means connected to an exit port of said integrating sphere for producing an output related to the integrated radiation produced by the integrating sphere; and
control means for receiving said output and for controlling, based on said output, the solid-state illumination sources to vary said output.
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Abstract
A radiometrically stable, spectrally tunable, solid-state source combines the radiometric outputs of individually controlled, narrow bandwidth, solid-state sources (e.g., LEDs) with different spectral distributions in an integrating sphere so as to approximate any desired spectral distribution. By using a sufficient number of independent solid-state source channels, the source can be tuned to approximate the spectral distribution of any desired source distribution. A stable reference spectroradiometer, integrated into the solid-state light source, measures the spectral radiance or irradiance and is used to adjust the output of the individual channels of the individually controlled sources.
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Citations
20 Claims
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1. A spectrally tunable solid-state source comprising:
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an integrating sphere having a plurality of ports;
a plurality of individually controllable solid-state illumination sources with different spectral distributions mounted on the integrating sphere at a plurality of said ports so as to direct radiation into the sphere such that the integrating sphere integrates said spectral distributions and produces integrated radiation based thereon;
output means connected to an exit port of said integrating sphere for producing an output related to the integrated radiation produced by the integrating sphere; and
control means for receiving said output and for controlling, based on said output, the solid-state illumination sources to vary said output. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A spectrally tunable solid-state source comprising:
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an integrating sphere having a plurality of ports;
a plurality of individually controllable solid-state illumination sources with different narrow bandwidth spectral distributions mounted on the integrating sphere at a plurality of said ports so as to direct radiation into the sphere such that the integrating sphere integrates the different spectral distributions and produces, based thereon, integrated radiation of an integrated wide bandwidth spectral distribution;
a reference spectroradiometer connected to an exit port of said integrating sphere for producing an output related to the integrated radiation produced by the integrating sphere; and
control means for storing desired spectral distributions, for receiving said output, for comparing a spectral distribution based on said output with one of the desired spectral distributions stored thereby to detect differences therebetween, and for controlling the solid-state illumination sources based on said differences. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
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Specification