DEVICE CHECKING SMALL ANGULAR DISPLACEMENTS Russian patent published in 1998 - IPC

FIELD: measurement technology. SUBSTANCE: device has source of coherent radiation, mechanical converter, optical unit composed of reflectors and beam splitter and monitor. Mechanical converter is manufactured in the form of belt transmission composed of driving wheel which rotation axis is tied up to object and three driven discs which rotation axes are located in angles of rectangle with specified lengths of sides. One reflector is positioned on each driven disc. One reflector is placed along diagonal of rectangle in opposition to beam splitter for rotation with the use of driving belt in direction opposite to rotation of driving wheel of belt transmission. Accuracy of check grows thanks to the fact that linear displacement of light spots in plane of monitoring exceeds three times displacement of light spots during single reflection. EFFECT: grown accuracy of checking. 3 dwg