SU1320683A1 - Device for measuring vibrations - Google Patents

Abstract

The invention relates to measuring, telite technique and is intended for measuring vibrations. The purpose of the invention is to increase the reliability and accuracy of measurements by ensuring the independence of the measurement result from environmental influences. The radiation from source 1 is polarized by a polarizer 2 and through a light guide 3, made curved in the form of an arc, hits the Wollaston prism 6. When the part 5 of the object vibrates relative to its part 4, the bending radius of the light guide 3 fixed on the parts 4 and 5 of the object decreases, i.e. varies ste (L

Description

polarization stump of radiation, which depends on the magnitude of vibration, and at the outputs of prism 6, the signals will be different, which will be registered by the photoreceiver1

The invention relates to a measurement technique and is used to measure vibrations.

The purpose of the invention is to increase the reliability and accuracy of vibration measurements by ensuring the independence of the measurement result from environmental influences.

The drawing shows a diagram of a device for measuring vibrations.

The device is a dust collector; it is a radiation source 1, optically coupled to a polarizer 2, the output of which is optically coupled to the input of a light guide 3, made in the form of a branch, curved arc, and mounted on a fixed 4 and vibrating 5 parts of the measurement object (not shown) , an optical polarized radiation separation element 6 made in the form of a Wollaston prism, as well as photoreceivers 7 and 8. The outputs of photoreceivers 7 and 8 are connected to the input of calculation unit 9, the output of which is electrically connected to measurement unit 10.

The device works as follows.

The radiation from the source 1 is polarized by the polarizer 2 and falls into the curved cylindrical light guide 3, fixed on the fixed 4 and vibrating 5 parts of the object of measurement.

. In the absence of vibration, the curved light guide 3 practically retains at its output an input degree of polarization of the radiation. The radiation coming out of the curved light guide 3 is divided by Wollaston's prism 6 into two mutually perpendicular waves (mines that are equal to each other when there are no vibrations). Optical signals through two channels reach the photodetectors 7 and 8, respectively, and then the electrical signals from them are 7 and 8. After processing in calculating block 9, the magnitude of the vibration can be determined from the indications of measuring block 10. 1 Cp f files, 1 sg.

fall on the input of block 9 of calculation. Block 10 in this case indicates zero.

When part 5 is vibrated with respect to part 4 of the measurement object, the bending radius of the light guide 3 decreases, and the light guide 3 does not move relative to the polarizer 2, since they are made together. Ste

the polarization stump of the radiation emanating from the curved light guide 3 changes with vibration. The degree of polarization depends on the magnitude of the vibration — the greater the vibration, the smaller the bending radius of the fiber, the greater the degree of depolarization, i.e. when vibrating at one output of prism 6, signals E are present, as in the absence of vibration, and the signal at the other output is reduced. At the output of the calculation unit 9, the signal increases, i.e. the ratio between the minimum and maximum electrical components of the radiation increases. The readings of block 10 correspond to the magnitude of the vibration.

Thus, the device measures the ratio between the perpendicular and parallel interface of the fiber - the environment is our, and their electric vector E. .. and E.

F f 0

, n .., .L | 1i. n, sin9i + Vn -n cosie

n UP7-n cos i -sin61

(

S in 61 + p Up soz20

)

0

where is EO n.

Till 01 l

incident wavej the refractive index of the light guide

the refractive index of the environment; the angle of incidence of the wave; fiber length

45

h dctge,, (d is the fiber diameter).

3 13206834

The dependence of the degree of polarization on E is Young's modulus,

the radius R of the bend of the waveguide R is the bend radius ..

P sin4cka (E (R) (1-R) i}, p E ,, - Ei

where P is the degree of polarization E ,, + Е. c — photoelastic constant; five

k is the wave vector; {E (R) (

V a - the radius of the fiber; h „+ h, i

n sihei-- nj -n cos e,, - n | cos2ei-sine ×

,, n .sine. + 1n.-n cos e, / sine, + njnj-n cosie /

 -EXj ..1.

 / n sine,, Y f .n, jn ,, - sin0; AW n, sine,, / l sine, + n, /

Solving a system with two unknowns; a curved arc and a photodetector, which is n, and R, is obtained by the fact that

„(4 increases the accuracy and reliability of measurements, it is equipped with a polarizer,

Claims (2)

1 .. Device for measuring vibra 2. A device according to claim 1, of tl tions, comprising successively that an optical installed radiation source, a light element is embodied in the form of a Voltovodod prism, made in the form of a branch, of an isastlast.