FIELD: instrumentation.
SUBSTANCE: proposed method is based on generation of spatial amplitude modulation of light reflected from the body by raster. Said raster is placed between optical system photo receivers. It comprises also detecting modulated light by, at least, four photo receivers and, at least, three differential amplifiers. Resultant output electric signal frequency is used to define body speed.
EFFECT: higher accuracy and reliability even in the case of soft and poorly reflecting surfaces.
2 cl, 2 dwg
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