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Meadowlark Optics - Wave Plates 6/24 LB 2024
Photonics Dictionary

phototransistor tachometer

A tachometer consisting of a light source, rotating perforated wheel and phototransistor to measure the rates of rotation of components. The phototransistor counts the flashes formed when the wheel, rotating with the sample wind tunnel model, interrupts the light from the source.
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