SU1310629A1 - Fibre-optic vibrotransducer - Google Patents

Abstract

The invention relates to a measurement technique and is used to measure displacements. The aim of the invention is to improve the accuracy by eliminating the influence of the flux formed on the parasitic optical fiber. In the event that the vibrating part 4 is not moving, part of the optical fibers 2.3 and 6.7 have an initial curvature, and hence light transmission, while the same light flux and the bridge are dropped on the photodetectors 12 and 13 12 and 13, the registering unit, calibrated in units of displacements, is balanced, showing zero displacement. When moving the vibrating part 4 of the object in any direction, the radius of curvature and the light transmittance of one of the parts 2, 3 or 6, 7 of the optical fibers decreases, while the other increases. In this case, the bridge, whose shoulders include photodetectors 12 and 13, is unbalanced, and the recording unit (not marked in the drawing) will show the amount of movement of the vibrating part 4 of the object. 1 il. S2 //////// Y7 //////// 71 71 Yu I / / / / / / / / / / / / / / / / / / 1/7 / // 1 | T11} IIII 1 M1 | ||| 1 |

Description

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

The aim of the invention is to improve the accuracy by eliminating the influence of the flux formed by the parasitic light guide.

The drawing shows a diagram of the Converter,

The proposed vibration transducer contains a successively located light emitter 1, a light guide made in the form of one branch consisting of two conjugate parts 2 and 3, one (3) of which is intended to be fixed to the vibrating part 4 of the object, the other (2)

for fixing on the stationary part 5 of the object, the second similar light guide from parts 6 and 7, fixed symmetrically to the first relative to the vibrating part 4 of the object, two cells 8 and 9 filled with liquid with refractive indices not lower than the refractive index of the cladding materials of the optical fibers, in which the sections of the corresponding light guides located at the output ends 10 and 11 are located and which are made free from the cladding, the recording unit in the form of two photodetectors 12 and 13 included in the adjacent arms of the measuring device hundred 14.

The proposed device works as follows.

In the absence of movement of the vibrating part 4 of the object, parts of the optical fibers 2, 3, and 6.7 have the same initial curvature, which means light transmission, while the same luminous flux and bridge falls on the photodetectors 12 and 13, the shoulders of which include the photodetectors 12 and 13, balanced, recording unit, graduated in units

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Editor L.Povkhan

Compiled by N. Zakharenko

Tehred A. Kravchuk Proofreader M. Sharoshi

Order 1879/36 Edition 678 Subscription

VNIIPI State Committee on the USSR

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Production and printing company, Uzhgorod, st. Project, 4

06292

displacement, shows zero displacement (not shown).

When moving the vibrating part 4 of the object in any direction, 5 the research institute radius of curvature and light transmission of one of the parts 2, 3 or 6, 7 of the optical fibers decreases, and the other increases. In this case, the bridge in the shoulders of which the photodetectors 12 and 13 are included is unbalanced, and the recording unit (not shown) will show the amount of movement of the plate 4, and during operation there will be a parasitic signal passing through the gap between the light guide itself and its shell.

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invention formula

A fiber-optic vibration transducer, containing a successively located light emitter and a light guide, made in the form of one branch, consisting of two parts adjoining in an arc, one of which is designed to be fixed to the vibrating part of the object, the other to be fixed to the fixed part of the object, and recording unit, to

 to which output ends of light guides are turned, characterized in that, in order to increase accuracy, it is equipped with a second similar light guide, fixed symmetrically

35 first with respect to the vibrating part of the object, and two cuvettes filled with liquid with indicators. refractions, not less than the refractive index of the materials of the sheath of light emitters, in which the sections of the corresponding light guides located at the output ends, which are made free of the sheath, and the recording unit are made in the form of

45 two photodetectors included in the adjacent shoulders of the measuring bridge.

Claims (1)

Claim A fiber-optic vibration transducer containing a sequentially located light emitter and a light guide made in the form of one branch, consisting of two parts conjugated along the arc, one of which is intended to be mounted on the vibrating part of the object, the other to be fixed on the fixed part of the object, and a recording unit to which the output ends of the optical fibers are facing, characterized in that, in order to increase accuracy, it is equipped with a second similar optical fiber fixed symmetrically to the first 35 relative to the vibrating part part of the object, and two cuvettes filled with liquid with indicators. refraction, not less than the refractive index of the materials of the sheath of light guides, in which the sections of the corresponding optical fibers located at the output ends are located, which are made free from the sheath, and the recording unit is made in the form of 45 two photodetectors included in adjacent shoulders of the measuring bridge. '