SU1550428A2 - Electric cyratory device for non-contact measuring of high voltages - Google Patents

Abstract

This invention relates to electrical measuring technology and can be used in high voltage installations. The aim of the invention is to improve the measurement accuracy. In an electrogenerating device, the radiation of the light source 1 passes successively through a monoblock rectangular prism 2 of birefringent substance, a block 3 of rotation of the polarization plane by 90 °, electrogenerating single crystals of centrosymmetric crystallographic class 4 and 5 with optically transparent electrodes on the ends, a rod of optically transparent glass 6, a prism analyzer 7, the outputs of which through two lenses 8.1 and 8.2 are connected to the inputs of photodetectors 9 and 10, and a functional converter 11, the output of which Is the output of the device. The presence of a second optical channel with the required rotation of the polarization angle increases the signal-to-noise ratio, thereby achieving the objective of the invention. 1 hp f-ly, 2 ill.

Description

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This invention relates to electrical measuring technology and can be used in high voltage installations.

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

FIG. Figure 1 shows a functional diagram of an electrohydration device for non-contact measurement of high voltages; in fig. 2 is a block diagram of the rotation of the polarization plane by 90.

The electrogiracy unit contains an optically coupled light source 1, a polarizer 2 in the form of a monolithic rectangular prism from a birefringent optical material of the rotational polarization unit 3, electrohydration single crystals 4 and 5 of electrogyration material of a centrosymmetric crystallographic class with optics - very transparent electrodes at the ends, a rod 6 of optically ghost glass, a prism analyzer 7, the outputs of which through two lenses 8.1 and 8.2 are optically connected to the inputs of photodetectors 9 and 10, and a functional converter 11.

The polarization plane rotation unit for the rotation angle of 90 ° (Fig. 2) contains a full internal reflection prism 12, which rotates the optical axis by 180 °, on the hypotenuse edge of which there are two full internal reflection prisms 13 and 14, with the first coiling face of the prism 13 optically connected to the entrance of the rotational polarization unit 3, and the second leg of the prism 13 through the full internal reflection prism 12 is optically coupled to the first full face of the full internal reflection prism 14, the second leg of which is Output of the block 3 of rotation of the polarization plane. The angle between the plane of incidence of light on the block 3 of rotation of the polarization plane and the transmission plane of the polarizer, i.e. The polarization azimuth is 45 °. Lenses 8.1 and 8T2S, which are used to focus two pairs of parallel analyzed optical rays from different optical channels into one of the photodetectors, are made in the form of collecting short-focus lenses and are installed on the central optical axes of the pairs of corresponding rays (Fig. 1).

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The device works as follows.

The light beam generated by light source 1 is split by a polarizer 2 into two beams of the same 10/2 intensity with mutually perpendicular polarization planes. One of the beams hits the rotation block of the polarization plane in the 90s.

When the rotation block 3 passes through the plane of polarization, the light beam is reflected 4 times internally. Then the acquired phase difference between the mutually perpendicular components

 arctg

;

cose.Jsin in.

j

n

(ABOUT

Where

 sin - “i

total internal reflection angle

n is the refractive index of the prism material.

Then at Q-45 ° and, 554, and 180 °.

Since the azimuth of the initial polarization b; yl is equal to 45, i.e. Since the mutually perpendicular components were equal, their acquisition of a relative phase difference of 180 ° means a rotation of the polarization plane by 90 ° (Fig. 2), i.e. Two rays of the same intensity of 10/2, with the same plane of polarization, hit a single crystal. Having passed the optical system from electrofusion single crystals 4 and 5 and the optically transparent rod 6, the light rays are split by a prism analyzer 7, the output of which is 4 beams. Pairs of rays of the same direction are focused by lenses 8.1 and 8.2 on the input areas of photodetectors 9 and 10, the output signals of which are equal to

 K IoO + sin) 2

(l-sin) „.,

where KA is the conversion factor of the photodetectors; angle of rotation of the polarization plane;

radiation intensity of un-polarized light. In the known device, the output signal of the photodetectors is proportional to the intensity of the light transmitted by the polarizer, which is equal to I 10/4, i.e. advantage of the proposed device

Ui

(2)

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The reason is that the light intensity at the input of photodetectors is 4 times greater, therefore, the signal-to-noise ratio at the output of the device will be large, and therefore the measurement accuracy will increase.

Claims (2)

1. Electrohydration device for contactless measurement of high voltages according to ed. St. No. 1298669, characterized in that, in order to improve measurement accuracy, a rotation block of the polarization plane is introduced into it, two collecting lenses, the polarizer is made in the form of a monoblock rectangular prism of a birefringent optical material, the rotation block of the polarization plane placed between the polarizer and the electrolytic single crystal on the optical axis of the first of the light rays that have passed the polarizer; the first and second lenses are placed between the prism analyzer and the photodetectors, respectively, on the central pti5504286 The axes of the first and second pairs of the analyzed light rays, the angle between the polarization transmission plane and the light plane on the rotation block of the polarization plane is 45. I 2. The device according to claim 1, about t l and That the block of rotation of the polarization plane contains the first and second prisms of total internal reflection, unwrapping the optical axis by 90 °, and the third prism of total internal reflection, unwrapping the optical axis by 180, the first leg of the first prism and the second leg of the second prism of the full internal reflections are, respectively, the input and output faces of the block of rotation of the polarization plane and are set normally to the incident and output light beams, the second leg of the first and first leg the edge of the second total internal reflection prism is set on the hypotenuse edge of the third full internal reflection prism.