SU1384944A1 - Device for turning object - Google Patents

Abstract

The invention relates to a measurement technique and can be used when certifying an angular displacement sensor. The aim of the invention is to improve the accuracy of the rotation of the object and the expansion of the range of controlled angles due to multiple re-reflections of the autocollimation beam between a rotatable multi-faceted prism and fixedly mounted multiple mirrors. The radiation from the autocollimator is directed to the entrance face of a multifaceted prism installed with the possibility of rotation around its axis. Autocollimation radiation between mirrors located around a multifaceted prism and its faces is successively re-reflected. Retroreflect radiation 6 (P with 00 4; with 4 i (

Description

additional mirror mounted to rotate around

granular prism. In the reverse direction, the radiation is again re-reflected between the mirrors and the multifaceted prism, they receive radiation into the autocollimator and build an image of the mark on the measuring scale of the autocollimator. 13849.44

Shifting the additional mirror, they combine the image of the mark with the mark itself — they measure the angular rotation of the mirror by the measuring unit of its inclination and determine the angle of rotation of the object from the measured value, taking into account the optical reduction of the multiply re-reflected autocollimation beam of radiation. 1 il.

one

The invention relates to a measuring technique and can be used for the certification of sensors of angular displacements, angular measurements, carrying out division work.

The purpose of the invention is to increase the accuracy of rotation of the object and expand the range of controlled angles of rotation of the object due to multiple re-reflections of the autocollimation beam between a rotating multi-faceted prism and several mirrors fixedly mounted, as well as by changing the direction of the light-returning autocollimation pen.

The drawing shows a schematic diagram of the proposed device.

The device contains a multifaceted prism 1, located on the base (not shown) and installed with the possibility of rotation around its axis, mirrors 2-6, located around the prism, which is one less than the number of lateral faces of the prism, autocollimator 7, including a collimator and a receiving unit, an additional a mirror 8 mounted rotatably around an axis 9 parallel to the axis of rotation of the prism and optically coupled to an autocollimator; a base rotation mechanism (not shown) and an additional mirror tilt measurement unit (not shown ). In addition, in the drawing indicated:

R is the radius of the circle tangent to the reflecting planes of the mirrors;

d is the radius of the circle inscribed in the prism;

n is the number of faces of the prism; Zr is the angle between the axis of the autocollimator 7 and the normal to the auxiliary mirror B, equal to

„„ .SinlBOVn

2J 2arctggy-3 - gjj y-.

The device works as follows.

The radiation from the autocollimator 7 is directed to the entrance face of the multifaceted prism 1, the radiation reflected from it is successively re-reflected between the mirrors 2-6 and other faces of the multifaceted prism. The transmitted radiation is returned by an additional mirror 8 to the output face of a multifaceted prism, the beam of radiation is again reflected in the reverse course between the multifaceted prism 1 and mirrors 2-6, and an image of the brand of autocollimator is built on its measuring scale. By setting the control object (not shown) to the angles equal to 360 / / n, determine with the help of the autocollimator the shift of the image of its mark from the optical axis, which characterizes the angle of rotation error.

object being scanned.

When the object is rotated by an angle that differs from an angle of a multiple of 360 / n, the multi-faceted prism is rotated by an angle of, for example, about.

The beam from the autocollimator 7, reflecting successively from the faces of the prism 1 and mirrors 2-6 (shown in dotted lines in the drawing), deviates from the initial position by an angle

equal to 2not. When tilting additional z.rkala 8 at an angle of p 2not around the axis 9 (the drawing shows the dotted, i

by the line) its reflecting surface assumes a position orthogonal to the direction of the beam incident on it, as a result of which the reflected beam moves in the opposite direction. The research institutes follow the same path as in the forward direction, and the brand of the autocollimator 7 is compatible with its autocollimation image. The angle p is determined by the node for measuring the angle of inclination of the additional mirror 8, it is 2 times larger than the angle ot and therefore allows the numerical value of the angle about to be determined with high accuracy.

Claims (1)

Invention Formula A device for rotating an object containing a collimator, a receiving unit, 20 optically coupled with a collimator, a prism having a regular polygon in section, a base on which a prism is mounted, which can be rotated around the geometric axis of the prism, a base rotation mechanism with prism and several five 0 5 mirrors, the number of which is one less than the number of faces of the prism, the collimator is installed at an acute angle to the input face of the prism and its optical axis is located in a plane perpendicular to the axis of rotation of the base, the mirrors are installed around the prism at equal distances from the axis of its rotation at an angle to a friend, equal to the angle of the prism, and the center of each of the mirrors is spaced, opposite the corresponding vertex of the prism, characterized in that, in order to determine the accuracy of the object's rotation and expand the range of the object's controlled angles of rotation nabzheno additional mirror mounted pivotably about an axis parallel to the axis of rotation of the base and disposed perpendicular to the direction of radiation collimator after multiple reflections between the facets at: zmy and mirrors, and an additional measuring unit mirror tilt and priemnsh unit combined with a collimator.