PHOTOELECTRIC DEVICE FOR MEASUREMENT OF ARTICLE DIAMETER Russian patent published in 2001 - IPC

FIELD: devices for contactless measurement of diameters of cylindrical bodies. SUBSTANCE: device has a point light source, collimator, photodetector and a plane mirror. A measuring pulse shaper, counting unit and an indicator are series-connected to the photodetector output. The plane mirror is installed with a deflection of 0.5 to 5 deg from the right angle between the plane of the mirror and the collimator axis. The photodetector is placed between the point light source and the collimator. The article under measurement is positioned between the collimator and the mirror. For protection of the optical system against external exposure the device is provided with protective masks. And for protection against dust and moisture of the point light source and photodetector it has glass plates. EFFECT: enhanced accuracy and stability of measurements. 2 cl, 3 dwg