SU1693528A1 - Method of determining coordinates of positions of linear electroconductive articles - Google Patents

Abstract

The invention relates to non-destructive testing and can be used to determine the coordinates of linear products. Improving the accuracy of determining the coordinates is achieved by selecting information points by the search engine. The search system consists of inductors 4 and 4 with an axial radiation pattern placed at the ends of segment 9 so that the axes of the coils lie in the same plane and perpendicular to segment 9. The search system is moved to achieve the minimum voltage on the outputs of coils 4 and 4. Then, at the obtained information points, the normal and tangential components of the secondary field are measured. 2 Il.

Description

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The invention relates to non-destructive testing, detection and determination of the coordinates of the location of electrically conductive linear products hidden under opaque dielectric coatings, and can be used in engineering, instrument-making and other areas of the national economy where it is necessary to determine the coordinates of the location of electrically conductive products such as pipelines, fittings or cables.

The purpose of the invention — improving the accuracy of determining the coordinates — is achieved by selecting information measurement points using a search measurement system.

FIG. 1 shows a device that implements a method for determining coordinates; in fig. 2 is a measurement circuit.

The device contains a controlled oscillator 1, to which the excitation system 2 is connected, sensitive elements in the form of orthogonal inductance coils 3-5, connected via switch 6 to measuring and control module 7, the control outputs of which are connected to generator 1 and switch 6. Information the output of the measuring control module 7 is connected to the indicator 8. The search system is formed in series according to the switched on coils 41 and 4 placed at the ends of the segment 9. The axes of the coils 41 and 42 are oriented perpene ikul angles to the length of 9 and lie in the same plane. Coils 3 and 3 measure the normal, and coils 51 and 52 measure the tangential components of the secondary field.

The device works as follows.

The control signal from the measuring and control module 7 is fed to the control inputs of generator 1 and switch 6. The generator powers the excitation system 2, which creates a quasi-uniform electromagnetic field in the controlled space. Switch 6 sequentially connects the orthogonal coils 3-5 of the transducer inductance to the measurement input of the measuring and control module 7. If there is a signal in the coils 41 and 4 of the inductance, the search system is oriented relative to the item 10 being monitored until this signal is zero or minimal. After that, the normal and tangential components of the electromagnetic field are measured, i.e.

signals from inductance coils 3 and 5 (Fig. 1), and according to a predetermined algorithm, a microprocessor in the measurement and control module 7 calculates and

determining the coordinates of the location of the linear electrically conductive article, which is then induced on. indicator 8. - Calculation of X and Z coordinates in the system

with the origin at the center of the segment connecting the information points, is as follows:

y - B (9% -tgai). (tg 02 + tg a)

Z (B-X) tgai

where B is half the distance between the points where the measuring elements are located

tg "i

Ulm3thtgq

I I 1U L - It,

 - Chizp - 2izp

where UiM3t U2M3t voltage values from measuring elements that measure the tangential components of the electromagnetic field;

UiMan .Uanan voltage values from coils S1, S2, 51, 52, which measure the normal components of the electromagnetic field.

Claims (1)

Invention Formula The method of determining the coordinates of the location of the linear electrically conducting products, which consists in creating an alternating electromagnetic field, measuring the normal and tangential components of the secondary field at selected information points, and determining the coordinates of the electrically conductive product in order to measure increase the accuracy of determining the coordinates, create a search measuring system consisting of two sensitive elements with an axial radiation pattern, placed at the ends of the segment, the axes of the sensing elements are oriented in a common plane and perpendicular to this segment, the position of the search measuring system varies, to achieve a minimum of the sum of the output voltages of the sensing elements, the information points are combined with the obtained position sensitive elements, the direction of the tangential component is chosen along the segment connecting the sensitive elements, and the normal component is chosen perpendicular to this segment and the axis of the sensitive elements. figure 1