SU1633277A1 - Method of checking the right-angle error of mirror/prism members - Google Patents

Abstract

The invention makes it possible to control the error of the right angle of the prism. The purpose of the invention is to increase the sensitivity of the control by forming a mirror image of the autocollimation image of the mark. The autocollimation beam is successively reflected from the side faces of the prism 4 and FIG. The first beam passed through it is retroreflected with a flat mirror 3, located at an angle of 9094- | 3k of the optical axis of the autocollimator 1. The retroreflected beam is again passed through the prism 4 and the hole in the mirror 3 and its image is arranged in the autocollimator 1. Move the prism 4 in a plane perpendicular to the optical axis of the autocollimator 1. Reflect the autocollimation beam from the catheter faces of the prism in reverse order, re-form the image of the light reflected by the mirror 3 of the beam and, by the difference of the two beam images, determine the error in otovlenii right angle prisms. 2 Il. with p (L / 05 with with ND

Description

The invention relates to a measurement technique and can be used to control the right angle of mirror prism elements.

The aim of the invention is to increase the sensitivity of the control by forming a mirror image of the autocollimation image of the mark.

FIG. Figures 1 and 2 illustrate the principle scheme of a prism control device at its two positions, which implements the proposed method.

The device contains an autocollimator 1, a stage 2 and a mirror 15 3 with a hole located opposite the lens of the autocollimator 1. Mirror 3 is located between the autocollimator 1 and the subject table 2, on which a 20 rectangular prism 4 of the BR-1801 type is located, facing the hypotenuse edge to autocollimator lens 1 and mirror 3.

FIG. Figures 1 and 2 show the K ,, (Xr-ugsl deflection of a retroreflective auto-5 collimation beam at two positions of the controlled prism; 90e i L is the angle of deflection of the mirror plane and the optical axis of the autocollimator.

The reflecting surface of the mirror 3 о faces the stage 2 with a controlled prism 4 and is oriented at an angle of the axis of a parallel beam of rays coming out of the autocollimator 1 in the main plane of the controlled rectangular prism 4. The angle (b must satisfy the condition

Cf / 2 - 2 nSMqKC,

40

R

where (0 is the field angle of view of the autocollimator 1; 8 "q, is the error limit value

right angle prism BR-180; n is the refractive index of the material of the prism (for the mirror element n 1). The method is carried out as follows.

Pre-placed controlled prism 4 on the stage in a position in which a parallel beam of rays from the autocollimator 1, passed the hypotenuse edge, falls entirely on one of the catheter faces, for example the right (Fig. 1).

The collimated beam from the autocollimator 1 is directed to the prism 4, the beam is passed through the prism 4, 50

Consequently, reflecting it from the prism catex faces, light reflecting the beam with a mirror 3 into a prism 4, intercept the retroreflected beam with an autocollimator 1 and construct its image. The count of the autocollimation image of the mark relative to the mark itself is taken.

Then the table with the prism 4 is moved in the plane of its main section perpendicular to the axis of the beam of rays directed to the prism, i.e. along the axis 00, or rotated 180 ° around the axis of the beam directed at it. In this case, a parallel beam of rays of the autocollimator 1 successively reflect the prism 4 from the side faces in reverse order (Fig. 2), again reflecting the beam with a flat mirror 3 and construct its image in the autocollimator 1. On the scale of the autocollimator 1, they take a second corner reading

X „.

five

about

0

0

For the first position of the prism 4, the ratio

4pЈ - K,,

where o is the error of the right angle of the prism;

n is the refractive index of the prism material;

(3 is the deflection of the reflecting bone of the mirror from the angle 90 with respect to the axis of the beam of rays directed from the autocollimator 1 to the prism 4.

For the second position of the prism 4, the ratio

4n + 2 | 3Y2.

From the two ratios, the error of the right angle l is determined, 4Kg 0 8p

For the second position of the controlled prism (Fig. 2), the retroreflected beam is mirror-deflected with respect to the beam at its initial position (Fig. 1), which allows to increase the offset between the two images of the mark and thereby increase the sensitivity when monitoring the right angle of the mirror -prismatic elements.

Claims (1)

Invention Formula The way to control the error of the direct angle of the mirror-prism elements, that is, they consistently reflect the collimated beam from the edges of the prism that form the right angle, re-reflect the beam that passed the prism with a flat reflector, pass it through the prism in the opposite direction, build its image in the autocollimator, measure the offset of the image of the autocollimation brand relative to itself marks and the magnitude of this displacement is judged on the error of the right angle, characterized in that, in order to increase the sense By controlling the mirror image of the autocollimation image of the mark, the controlled prism is moved in a plane perpendicular to the axis of the collimated beam, the collimated beam is again sequentially reflected for the second time from the faces that form the right angle in reverse order. the shift of the autocollimation image of the mark relative to the mark itself and the error of the right angle determine the values of the difference between the two samples. 2  Phage. 2