SU1295210A1 - Eddy-current transducer for contactless measuring of angular displacements of flat conductive objects - Google Patents

Abstract

The invention relates to instrumentation engineering and is intended for contactless measurement of the angle of inclination of flat conducting objects. The purpose of the invention is to expand the functionality of the converter by determining the spatial position of the flat conducting object s of the three-dimensional space. The transducer contains excitation coils 1. and 2, installed mutually perpendicular and made with flat rectangles and, and three identical mutually perpendicular flat rectangular measuring coils 4-6, which are subjected to voltage proportional to the quadrature component of the vector voltage. eddy currents induced in the wire of a single object by stimulating coils and caused by the position of the conductive object in space, 1 sludge. § (L

Description

The invention relates to a measuring and measuring technique, namely, to a contactless measurement of the angle of inclination of a flat conducting object relative to the working surface of the transmitter, and can be used in mechanical engineering and telemetry systems.

The purpose of the invention is to expand the functionality of the converter by determining the spatial position of the flat conducting object in three-dimensional space.

The drawing shows an eddy current transducer for non-contact measurement of the angular displacements of flat conducting objects,

The eddy current transducer consists of two identical flat right rectangular excitation coils 1 and 2, installed mutually perpendicular rn so that their intersection line lies on the axis of symmetry of the coils and coincides with the axis 3 of the transducer. Three identical flat rectangular measuring coils 4-6, installed mutually perpendicular so that the symmetry centers of all three coils coincide, the intersection line of coils 4 and 6 coincides with the side of the exciting coil 1 located near the working surface of the converter.

The converter works as follows,

The first and second 2 excitation coils are connected alternately to a current generator (not shown). The voltage on the measuring coils 4-6 is induced only by eddy currents in the conductive object and, due to the mutually perpendicular arrangement of the measuring coils, is proportional to the quadrature component of the vector of the intensity of the eddy currents. The dimensions of the first 1 and second 2 excitation coils are chosen so that the excitation of eddy currents in a flat conducting object is carried out by continuous conductors — the sides of the first 1 and second 2 excitation coils closest to the working surface of the converter. From geometric constructions it is obvious that the vectors of the intensity H and H of the magnetic field of the eddy currents of the first 1 and second 2 exciting coils lie in a plane parallel to the surface of the flat conducting object. We denote the vector by the intensity H , the magnetic field of the eddy currents of the first exciting coil 1 through V, V (u p delivering the vector of intensity Hj the magnetic field of the eddy currents of the second exciting coil

2 through V ,,,,

V

H

V

27

Here is vix

Vjy - voltages, induced in the third measuring coil 6,, Vj ,. - voltages induced in the first measuring coil A, V, V

 cz7

- voltages induced in the second measuring coil 5 from the first and second excitation coils 1, 2, respectively. The positions of the flat conducting object uniquely determine the third vector H, equal to the vector product, and x,. This vector is perpendicular to the plane of the conducting object and its beginning coincides with the intersection point of the first 1 and second 2 exciting coils near to the working surface of the transducer. It is known that

Thus, any position of the conductive object is uniquely determined by the vector Hj, perpendicular to the flat conductive object using the first 4, second 5 and third 6 measuring coils.

Claims (1)

Invention Formula Eddy-current transducer for non-contact Measurement of the angular displacements of flat conductive objects, containing a flat rectangular excitation coil located perpendicular to the working surface of the preamplifier, and two identical flat rectangular measuring coils installed mutually perpendicularly in such a way that the lines of their intersection coincide with a cross coil, which are mutually perpendicular in such a way that the lines of their intersection coincide with a cross coil that are mutually perpendicular to one another so that their lines cross each other. to the working surface of the transducer side of the exciting coil, characterized in that, in order to expand the functional possibilities by converting it through the definition of simple 3 12952104 position of the planar object is dicariously so that the line of their transsexual object in three-dimensional space lies on the axis of symmetry of the coils it is equipped with a second identical one and coincides with the axis of the converter, The first excitation coil and the measuring coil are the first three-th identical to the first two out of the five to the first two, and the centers with a measuring coil that excites the metrics of all the measuring coils coils are installed mutually perpen-match.