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stroboscope
An instrument that produces regular brief flashes of intense light, used to study periodic motion, to test machinery, and in high-speed photography. When the flash frequency exactly matches that of the rotation or vibration, the object is illuminated in the same position during each cycle, and appears stationary. A gas discharge lamp is used, with flash duration about 1 microsecond and frequency from 2 to 3,000 hertz.
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• INSTRUMENTATIONAlso on this site:
Encyclopedia of Alternative Energy & Sustainable Living
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