SU1268948A1 - Device for checking angular parameters of plane-parallel plates - Google Patents

Abstract

The invention relates to a measurement technique and can be used to control a wedge shape. The aim of the invention is to improve the accuracy of control by ensuring the parallelism of the beams at the entrance to the telescope in the absence of a controlled product in the circuit, controlled by the interference pattern. In addition, by introducing a polarizer, a half-wave plate and a rotary analyzer into the device circuit, it is possible to align and adjust the brightness of the combined and measured highlights in the field of vision of the telescope. This circumstance, as well as the possibility of exclusion from the field of view of all glories. Covers, in addition to being measured, are achieved by introducing a photo gate into the circuit. A parallel beam of rays from the source is divided into two beams, which with the help of mirrors direct from different sides on the surface of the test item. Reflected (by them, the beams are combined on a beam splitter and form two collimation highlights in the field of view of the reference telescope. The shape of the product is determined by the distance between the highlights. 1 Il.

Description

00

with

four

00

This invention relates to a measurement technique and can be used to control the clononidity of opaque and transparent rods.

The aim of the invention is to improve the accuracy of measuring the wedge shape by providing parallel beams at the entrance to the telescope in the absence of a controlled article controlled by an interference pattern in the circuit.

The drawing shows a diagram of the device.

The device contains a source of monochromatic radiation (a laser or a conventional source with an interference optical filter) 5 polarizer 2, for example, a polaroid film that expands the telescopic system, consisting of two lenses 3 and 4, flat mirrors 5-7, a beam splitter 8, a controlled rod 9 , a half-wave plate 10, a reading telescope, such as a theodolite consisting of an objective 11 and an eyepiece 12, an analyzer 13 installed in a rotary mechanism, such as a rotary floor, and a photo shutter 14.

Polarizer 2 and beam splitter 8 are arranged in series along the beam of radiation emitted by source 1 of Mirrors 6 and 7 are oriented so that beams emanating from beam splitter 8, reflecting from them, go towards each other. The telescope, formed by the element; zmi P and 2, is installed in the path of the rays reflected in succession from mirrors 6 and 7 and passed the second splitter 8 for the second time, so that its axis coincides with the mirror image of the source beam axis entering the beam splitter The half wave plate 10 and the photo shutter 14 are located along one of the beams coming out of the beam splitter 8, and the analyzer 13 is installed along the beam at the output of the viewing telescope.

The device works as follows.

The radiation from source 1 with the help of polarizer 2 turns into linearly polarized, expands with telescopic system 3 and 4 and is directed by mirror 5 to the beam splitter 8. The splitter 8 separates

689482

the light beam into two, one of which passes the half-wave plate 10, set so that it turns the plane of polarization on

5 90 ° 5 is reflected from mirrors 7 and 6 and again from the semitransparent diagonal of the splitter 8. The second beam passes through the splitter 8, reflects from mirrors 6 and 7, passes the semi-OO wave plate 10 and again the splitter B, Thus, after the second passage of the splitter 8 two coherent waves are produced that form the interference

15 picture. By turning the splitter 8, the settings of the interference pattern to an infinitely wide band are achieved.

With an open photogate 14 in terms of 20 views of pipe P and 12, in the absence of rod 9, there are two highlights. When adjusting to an infinitely wide strip, these two highlights merge into one, which, by turning the tube, coincides with the center to cross its grids (not shown). With the introduction of the rod 9 in the field of view, two more highlights appear, corresponding to reflections from the ends of the rod. Kernel

The 30 9 is fixed in a special adjustment device allowing the rod to be rotated around an axis perpendicular to the beam. When the rod 9 is turned, the central flare, combined with the center of the cross, remains fixed, and the other two flares, which correspond to reflections from the ends of the rod, are shifted, thus achieving the identification of the blocks. When the

The collar 40 of the rod 9, one of the two highlights reflected from the ends of the rod, is combined with the fixed glare (and the center of the cross). The deviation of the second moving flare relative to the center of the cross over determines the angle of the wedge shape.

As a result, the half-wave plate 10, the beams reflected from the ends of the rod 9, turn out to be orthogonal to the rest of the beams, getting into the telescope. Therefore, by analyzing the analyzer 13, it is possible to increase the brightness of the glare combined during the control process, which allows an increase in the accuracy of the combination.

When removing the reference position of the flare obtained by reflection from the right

the end face of the rod 9, the photo shutter 14 is closed, which eliminates the remaining glare and thereby increase the accuracy of the reference.

Thus, due to the fine tuning of the scheme, carried out according to the interference pattern, the adjustment of the brightness of the combined highlights and the highlight reflection, whose position is measured, an increase in the accuracy of the wedge shape is achieved.

Claims (1)

Invention Formula A device for monitoring the angular parameters of plane-parallel plates, containing a source of parallel monochromatic radiation, a beam splitter installed in the beam path, two. flat mirrors installed along the beams, output68948 " of the beam splitter and optically coupled to each other, and the reference telescope located along the beam, again passing through the light distribution. 5 characterized by the fact that, in order to improve the accuracy of measuring the wedge shape, it is equipped with a polarizer installed between the source of radiation 10 a beam splitter, a half-wave plate and a photo gate located successively in the path of one of the beams at the output of the beam splitter, and an analyzer installed j along the beam passing through the telescope, with the possibility of Orochi around the beam axis and the telescope is arranged so that it coincides with the axis of mirror image 20 axis of the source, formed by the plane of the splitter, 12