SU1375951A1 - Polarometric goniometer - Google Patents

Abstract

The invention relates to a measurement technique and can be used to control the angles of rotation of objects. The aim of the invention is to improve the accuracy of control due to the multiple cooling of a plane-polarized beam of rays through an optical element rotating the plane of polarization. The collimated plane-polarized beam of source 2 passes through a square tip on the edge of the first rectangular prism 3, then through the prism 6. Dove, reflected from the second rectangular prism 7 and returned back to the prism 6 Dowe, reflected from the first rectangular prism 3 and again return to prism 6 Dove. The collimated plane-polarized beam of rays through n arrivals through a prism 6 Dowe comes out through a flat surface at the edge of the right angle of the second rectangular prism 7 and, after passing through analyzer 9, falls into the ocular 10. Turning the object under control (not shown) at angle d causes the holder to rotate at angle d with prism 6 Dove, turning the plane of polarization of the collimated beam of rays at an angle of 2 W. Turning the analyzing angle 8 determines the position at which the field is maximally darkened, then Scores of coarse scales 5 and 12 exact reference. 3 il. I (L

Description

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The invention relates to a measurement technique and can be used to control the angles of rotation of objects.

The aim of the invention is to improve the accuracy of control by providing multiple passage of a plane-polarized collimated beam of rays through an optical element rotating the plane of polarization.

Figure 1 shows the structural diagram of a polarimetric protractor; 2, the first rectangle at

zma; Fig. 3 shows a second rectangular prism.

The field protractor contains (figure 1) case 1 installed in case 1 of a source 2 of a collimated flat-polarized radiation with a diameter d located at an angle to the optical axis of the protractor, the first rectangular prism 3, which is set so that its hypotension face is perpendicular the optical axis of the protractor and optically coupled to the source 2 through a square cut-out of size d on the edge of its acute angle, the holder 4 mounted in the housing 1 with the possibility of rotation around the optical axis of the protractor, the coarse reference 5, fastened with a holder 4, prze 6 dove, mounted in holder 4 so that its main plane is parallel to the optical axis of the protractor, and its input face is optically matched with the hypotenuse edge of the first rectangular prism 3, the second rectangular prism 7 installed so that its hypotenuse is perpendicular to the optical axis of the protractor and optically coupled to the output face of Dove's prism 6, while the first and second right-angle prisms 3 and 7 (Figures 2 and 3) have flat surfaces on the faces of the right angle d, perpendicular to optical the axis of the protractor, analyzing the node 8 in the form of sequentially installed analyzer 9 and ocular 10, made with the possibility of rotation around the optical axis of the protractor, the cone 11, fastened to the analyzing node 8 and the limb 12, fastened to the body 1.

With the holder 4, a shaft (not shown) is fastened, the angle of rotation of which is to be measured.

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The protractor works as follows.

The collimated plane-rim-ray beam of source 2 passes through a square cut on the edge of the first rectangular prism 3, passes through the Dowa prism 6, reflects from the second right prism 7 and returns back to the Dowa prism 6, then reflects from the first rectangular prisms

3 and again returned to prism 6 Dove.

A collimated plane-polispray beam of rays through n odd passages through a prism 6 Dove exits through a flat surface at the edge of the right angle of the second rectangular prism 7.

In order for a beam of rays to enter 6 Dove's prism 6 with a light diameter D to enter from the second rectangular prism 7, the following condition must be met: n – d D.

When turning the controlled object (not shown) at an angle with / holder

4 rotates the same angle d,

Rotation of the prism 6 Dowe installed in the holder 4 causes the polarization of the beam polarization to rotate by 2d,

Since the beam of rays passes through the Dove's prism 6 times, the angle of rotation of the polarization plane is 2 p. By turning the analyzing unit 8, its position is determined at which the luminous flux at its output, mI, is minimal. On a scale of 5 coarse readings, as well as on limb 12 and vernier, the angle of rotation of the object being monitored is determined.

Due to the repeated (n times) passage of a collimated plane-polarized beam of rays through a prism 6 The accuracy of the measurement of the angle of rotation is increased n times.

Claims (2)

Invention Formula A polarimeter goniometer, comprising a housing and a source of collimated flat-polarized radiation of diameter d, successively installed in the housing, a holder mounted for rotation around the optical axis of the goniometer, a rotator of the polarization plane mounted in the holder, analyzing a node in the form of a sequentially installed analyzer and an ocular device installed pivotally around the optical axis of the goniometer, a limb fastened to the body, and a nonius fixed to the analyzing node and mounted close to the limb, characterized in that, in order to improve the accuracy of control, it is equipped two rectangular prisms set with respect to the rotator of the polarization plane so that their hypotenuse faces are perpendicular to the optical axis of the protractor and optically conjugated respectively the input and output faces, the rotator of the polarization plane, and the coarse reference clamp fastened to the holder, the rotator of the polarization plane is made in the form of a Dove prism, and both prisms have flat surfaces on the faces of the right angle, perpendicular to the optical axis of the protractor and d in size, first in the course of the rays, the prism has a square cutout edge d in size, through which the prism is optically coupled to a radiation source mounted at an acute angle to the optical axis of the protractor. - 0t / 2.Z - n -Fig