SU1705696A1 - Device for determining location of linear conducting articles - Google Patents

Abstract

The invention relates to a measuring and control technique, namely, devices for contactless measurement of the location of linear electrically conductive products. The purpose of the invention is to improve the accuracy of determining the location. For this, the device contains a generator, an eddy current transducer, the measuring element of which is made in the form of two orthogonal coils, a switch, a measuring-controlling module with a microprocessor and an indicator, as well as an exciting system in the form of a grid of mutually perpendicular linear conductors and additional measuring elements made in the form of orthogonal coils. In this case, the coil axes are oriented in the direction of the linear conductors, the measuring elements through the switch are connected to the measuring and control module, the information output of which is connected to the indicator, and the control outputs to the generator and switch. 2 Il. ate with

Description

The invention relates to non-destructive testing and detection of electrically conductive products and can be used in the instrument-making and engineering industries, as well as in other areas of the natural economy, where it is necessary to determine the coordinates of linear electrically conductive products, as well as conductors along which alternating current flows.

Devices for detecting electrically conductive products are known based on the eddy current method, in which the measuring element of the eddy current transducer is made in the form of a round or square frame.

The main disadvantages of these devices are that they do not allow

determine the coordinates of the conductive product, and only fix its presence.

A device selected as a prototype is known that allows determining the direction of the linear electrically conductive product relative to the converter, comprising a generator and a eddy-current converter connected to it, the measuring element of which is made in the form of two orthogonal coils.

However, this device also does not allow to unambiguously determine the coordinates of the location of the test article if it is displaced relative to the center of the eddy current transducer.

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The purpose of the invention is to improve the accuracy of determining the coordinates.

The goal of the device for determining the location of linear electrically conductive products, comprising a generator and an eddy current transducer, the measuring element of which is made in the form of two orthogonal coils, is achieved by the fact that it is equipped with a switch, microprocessor measuring indicator and indicator, as well as exciting a system in the form of a lattice of mutually perpendicular linear conductors, and three additional measuring elements, made in the form of orthogonal cat lugs, the coil axes are oriented in the direction of the linear conductors, the measuring elements through the switch are connected to the measurement and control module, the information output of which is connected to the indicator, and the control outputs to the generator and the switch.

FIG. 1 shows the design of an eddy current transducer; in fig. 2 is a block diagram of the device.

The eddy current transducer (Fig. 1) contains excitation systems 1 and 2 of linear conductors and measuring elements of orthogonal coils 3-6. Linear electrically conductive article 7 is located under the eddy current transducer.

The block diagram of the device for determining the location of electrically conductive products (Fig. 2) contains a generator 11, the output of which is connected to the excitation systems 1 and 2. The measuring elements 3-6 of the eddy current transducer are connected through the switch 8 to the measuring input of the measuring and controlling module 9, the information output of which is connected to the input of the indicator 10, and the control outputs are connected respectively to the generator 11 and the switch 8.

The device works as follows.

The control signal from the measuring and controlling module 9 is fed to the control input of the switch 8, which sequentially connects the measuring elements 3-6 of the eddy current transducer to the measuring input of the measuring and controlling module 9 with a microprocessor. If there is a signal in the measuring elements, i.e. induced emf, this means that alternating current flows through the product, and a signal is sent to the control input of the generator 11,

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which turns off excitation systems 1 and 2. If there is no signal in the measuring elements at the initial time, then excitation systems 1 and 2 are connected to generator 11, creating quasi-uniform electromagnetic fields, which induce eddy currents in an electrically conductive product, which, in turn, EMF is induced in the measuring elements of the eddy current transducer. These signals from measuring elements 3-6 are proportional to the normal and tangential components of the electromagnetic field. After processing the signals according to a certain algorithm, the microprocessor of the measuring control module 9 determines the coordinates of the location of the electrically conductive product 7 (Fig. 1) and is induced on the indicator 10.

After measuring and converting the signals from the measuring elements into a digital code, the values of tgai and t g 2 are determined by the formulas

Vi

of

Vlnan

G2iep

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where / 1e2 / 2f Ґ are the voltage values from the measuring coils, which measure the tangential components of the electromagnetic field;

Vi of n, V2 of n is the values of the voltages from the measuring coils, which measure the normal components of the electromagnetic field.

Next, the coordinates of the linear conductive product are determined by the formulas

x B (tgai-tga2) Z (B x) tgai, tg 02 + tg aiv a

where B is half the distance between the measuring elements;

"1 and oi are the angles determined from the ratio of the normal and tangential components (voltage from orthogonal coils).

The advantages of the proposed device are that it can significantly improve the accuracy of determining the coordinates of the location of electrically conductive extended products by creating a special topology of the exciting electromagnetic field, measuring the components of the secondary electromagnetic field at certain points in space and processing the received signals according to the proposed algorithm.

Claims (1)

An apparatus for determining the location of linear electrically conductive products, comprising a generator and a vortex converter, the measuring element of which is made in the form of two orthogonal coils, characterized in that, in order to improve accuracy, it is equipped with a switch, measuring and controlling module with microprocessor and indicator, as well as exciting system0 in the form of a grid of mutually perpendicular linear conductors and three additional measuring elements made in the form of orthogonal coils, the axes of the coils are oriented in the direction of the linear conductors, the measuring elements through the switch are connected to the measuring and control module, the information input of which is connected to the indicator, and control outputs to the generator and switch. /// / /// / / Z. / 77 / CPU (G. i