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

FIELD: measurement technology. SUBSTANCE: proposed device includes source of coherent radiation, mechanical converter, optical unit composed of two beam splitters, reflector which normal coincides with bisectrix of angle between beam splitters and monitor. Bisectrix of angle between beam splitters is oriented perpendicular to optical axis of device. Mechanical converter is manufactured in the form of belt transmission with one driving wheel which rotation axis is coupled to object and with five driven discs. Rotation axes of four driven discs are located in angles of rectangle which major side is perpendicular to optical axis. Rotation axis of fifth disc is placed in center of mentioned side of rectangle. Optical unit is fitted with five reflectors, each put on driven disc. Reflector put of fifth disc has reflecting coat on both surfaces and is optically coupled to source of coherent radiation. EFFECT: increased accuracy thanks to elimination of influence of distance between optical unit and monitor. 2 dwg