SU1276939A1 - Device for checking right dihedral angles of mirror-prism elements - Google Patents

Abstract

The invention relates to an optical instrument making and improves the accuracy of the control. During the passage through the plane-parallel plate 5 of the part of the light beam from the source 6 mirrors 2-4 are installed, after successive reflection from which the light beams fall on one face of the controlled prism 10. Another part of the light beam reflected from the plate 5 falls on another face of the prism 10 Mirror 1 returns light beams reflected from the faces of the prism 10 to the same faces. The magnitude of the non-perpendicularity of the controlled faces of the prism 10 is determined by the difference in the angular distances between the interference spots formed in the field of view of the receiving device 7 by the interaction of light beams, which are secondarily reflected from the faces of the prism 10 and directly through mirrors 2-4 to a plane-parallel plate 5, at two positions x (L of the subject table, differing by 180 1 Il.

Description

The invention relates to optics and can be used in optical instrumentation for high-precision control of the direct dihedral angles of mirror-prism elements, in particular, corner reflectors with the required radiation pattern.

The aim of the invention is to improve the measurement accuracy.

The drawing shows a diagram of the device for controlling the direct dihedral angles of the mirror-prism elements.

The device contains mirrors 1, 2, 3 and 4, a plane-parallel plate 5, installed at an angle of 45i2 to its optical axis of the light flux created by the coherent radiation source 6, while mirrors 2 and 4 are installed parallel to the plane-parallel plastip 5, and mirror 4 has: behind the plane-parallel plate 5 along the luminous flux passing through it, and the mirror 2 is located in front of the plane-parallel plate 5 along the reflected luminous flux from it, with the mirror 3 installed between mirrors 2 and 4 perpendicular angles to each of them, and the mirror 1 - between the mirror 2 and plane-parallel plate 5, the reflected light flux from it. In addition, the receiving device 7 is installed behind the plane-parallel plate 5 against the course of the reflected light flux from it, while the mirror 1 and the controlled prism are mounted on the stage 8, which can be rotated 180 around an axis 9 perpendicular to the optical axis of the light flux, and the edge the controlled dihedral angle of the prism is directed to the mirror 1,

The device operates in the following manner.

A coherent radiation source 6 irradiates a 1-m beam with a plane-parallel plate 5, with a part of the light beam reflected from the plane-parallel plate 5 and falling onto the first face of the prism, and the other part of the light beam passing through the plane-parallel plate 5 and reflecting from mirrors 4, 3, and 2 falls on the second face of the Yud prism, after which the light beams reflected from the five faces of the prism fall

on mirror 1 and, reflecting from it, again fall on the corresponding face of the prism, while after reflection from the first rpaHVi light prism

the beam passes through the plane-parallel plate 5, and the light beam reflected from the second facet of the prism is successively reflected from mirrors 2, 3 and 4 and from the plane-parallel

plates 5 o In the field of view of the receiving device 7, images of two strictly identical interference spots formed by the interaction of light beams as a result of reflection from a plane-parallel plate 5 are observed, between which the distance in the angular measure is measured.

The angular distance, between, the interference spots, is determined by the formula:

st, 4u (v. 2uf,

1 de utxi is the deviation of the controlled angle of the prism 10 from the straight line; uf is the amount of non-parallelism of light beams falling on controlled faces

prisms 10.

I

After turning the sample stage 8 approximately 180 degrees around axis 9, the angular distance Sz between the interference spots will be determined by the formula

3.5

F -4uoi (2Ai.

Subtracting one result from the other, one obtains the desired value of the non-hyperparity of Lo. controlled faces of the prism 10 by the formula

l ":.

Claims (1)

The invention relates to optics and can be used in optical instrumentation for high-precision control of the direct dihedral angles of mirror-prism elements, in particular, corner reflectors with the required radiation pattern. The aim of the invention is to improve the measurement accuracy. The drawing shows a diagram of the device for controlling the direct dihedral angles of the mirror-prism elements. The device contains mirrors 1, 2, 3, and 4, a plane-parallel plate 5 installed at an angle of 45i2 to its optical axis of the light flux created by the coherent radiation source 6, while mirrors 2 and 4 are installed parallel to the plane-parallel plastip 5, and mirror 4 has split: It is located behind the plane-parallel plate 5 along the luminous flux passing through it, and the mirror 2 is located in front of the plane-parallel plate 5 along the reflected luminous flux from it, while the mirror 3 is installed between the mirrors 2 and 4 perpendicular angles to each of them and the mirror 1 - between the mirror 2 and plane-parallel plate 5 is parallel to the reflected light flux from it. In addition, the receiving device 7 is installed behind the plane-parallel plate 5 against the course of the reflected light flux from it, while the mirror 1 and the controlled prism are mounted on a slide 8, which can be rotated 180 around an axis 9 perpendicular to the optical axis of the light flux, the edge of the controlled dihedral angle of the prism is directed to the mirror 1; the device operates as follows. A coherent radiation source 6 irradiates a 1 m beam with a plane-parallel plate 5, with part of the light beam reflected from a plane parallel to plate 5 and falling onto the first face of the prism, while the other part of the light beam passes through the plane-parallel plate 5 and after subsequent reflection from mirrors 4, 3 and, 2, Yud falls on the second face of the prize, after which the light beams reflected from the edges of the prism fall onto the mirror 1 and, reflected from it, again fall on the corresponding face of the prism, while after reflection from When the prism's rpaHVi light beam passes through the plane-parallel plate 5, and the light beam reflected from the second facet of the prism, it is successively reflected from mirrors 2, 3 and 4 and from the plane-parallel plate 5 o In the field of view of the receiving device 7, two strictly identical interference spots are observed formed by the interaction of light beams as a result of reflection from a plane-parallel plate 5, between which the distance in the angular measure is measured. The angular distance θ, between the interference spots is determined by the formula: nd, 4u (V. 2uf, 1 utxi - deviation of the controlled angle of the prism 10 from the direct angle; uf - non-parallelism of the light beams falling on the controlled faces of the prism 10. After turning the sample stage 8 around 180 around the axis 9, the angular distance Sz between the interference spots will be determined by the F -4uoi formula (2Ai. Subtracting one result from another, the desired non-perpendicularity of Lo controlled faces of the prism 10 is obtained according to the formula L " : Form The device for controlling the direct dihedral angles of the mirror-prism elements, contains its source of collimated radiation, a beam splitter in the form of a plane-parallel plate, a receiving device, characterized in that, in order to increase the accuracy of control, three mirrors are inserted into it, installed along the proglister through a beam splitter with the first and third mirrors parallel to the beam splitter, and the second perpendicular to p 12769394 but them, and the fourth mirror installed between the beam splitter and the third mirror od 45 ° angle to the latter.