NASA NTRS · 19630000073
Variable light source with a million-to-one intensity ratio
Abstract
A wide range, variable intensity light source of constant color characteristics has been developed for testing and calibrating photomultiplier tubes. A light attenuator first diffuses light from a constant source, then permits variable attenuation through a series of chambers and adjustable apertures.
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Snow, W. B.. 1964-08-18. Variable light source with a million-to-one intensity ratio. https://ntrs.nasa.gov/citations/19630000073
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