SU849001A1 - Device for measuring angular displacements - Google Patents

Description

one

The invention relates to a copy-measuring technique, in particular, to the construction of devices for measuring angular movements of objects.

A shaft rotation angle sensor is known that contains a drum disposed on the shaft and rigidly connected to it, with a measuring raster applied on it / a long light source located along the shaft axis, an indicator raster and a photodetector fl.

However, this sensor does not have sufficient control accuracy, and. In addition, it is not possible to determine the direction of rotation of the shaft from the sensor output signal.

Closest to the invention. technically, an angular displacement measurement device comprising a coaxially and successively arranged illuminator,. mobile raster, reflector block and G2 photoreception system.

A disadvantage of the known device is that, because of the incomplete circular coverage of all the rasters, it has a relatively low accuracy.

a reading that negatively affects the accuracy of measurements. The purpose of the invention is to improve the measurement accuracy.

The goal is achieved by the fact that the reflecting unit is made in the form of four plane-parallel plates, each of which has the shape of a four-petal ellipse,

10 one of the foci of each petal of which is aligned, and in the others - conical reflectors are made, and a round hole, the center of which is aligned with a common focus, a raster grid is applied to the inner surface of the hole, the large axes of the petals are at right angles to each other, plates placed one after another and shifted around

20 of their common axis of symmetry is 1/4 of a raster grating pitch, and the photodetector system is made up of sixteen photodetectors, each of which is mounted opposite to the corresponding

25 conical reflector.

FIG. 1 shows the proposed device; in fig. 2 shows section A-A in FIG. one.

The device includes a housing 1, in which coaxially and sequentially

thirty

Claims (1)

Claim An apparatus for measuring angular displacements, comprising successively and coaxially located illuminator movable raster reflecting _ photodetecting unit and system / o l t ^e aspirants and in that, for the purpose of measurement accuracy -Increase reflecting unit is formed as a plane-parallel plates chetyr'eh , each of which has the shape of a four-staple-shaped ellipse, one of the foci of each petal of which is aligned, and the others have conical reflectors, and a round hole, the center of which is aligned with the general focus, 15 for internal rotation A raster grating is applied to the hole, the major axes of the petals are located at right angles to one another, the plates are placed one after the other and shifted 2Q around their common axis of symmetry by 1/4 of the raster grating step, and the photodetector system is made in the form of sixteen photodetectors, each of which mounted opposite the corresponding conical reflector.