SU649997A1

SU649997A1 - Eddy-current device for non-destructive inspection of articles

Info

Publication number: SU649997A1
Application number: SU762310958A
Authority: SU
Inventors: Владимир Владимирович Клюев; Виктор Павлович Курозаев; Юрий Михайлович Шкарлет
Original assignee: Предприятие П/Я Р-6303
Priority date: 1976-01-06
Filing date: 1976-01-06
Publication date: 1979-02-28

Description

Устройство работает следующим образом .The device works as follows.

Источник 6 переменного тока обеспечивает переменный ток в возбуждающих катушках 2 и 5. Подбором числа ампер-витков в катушке 5 обеспечивают такой рож .им работы реобразовател 1, что временные характеристик1И сигнала на выходе преобразовател 1 не измен ютс при изменении зазора. Сигнал с выхода преобразовател поступает в блок 7 обработки и индикации сигнала, где преобразуютс временные характеристики сигнала в показани индикаторов, которые при правильном подборе параметров преобразовател м режима его питани не будут зависеть от зазора.The AC source 6 provides alternating current in the excitation coils 2 and 5. By selecting the number of ampere turns in coil 5, the reformer 1 is designed so that the time characteristics 1 of the signal at the output of the transducer 1 do not change as the gap changes. The signal from the output of the converter enters the signal processing and indication unit 7, where the signal's temporal characteristics are converted into indications of indicators, which, if properly selected, the parameters of the power mode converter will not depend on the gap.

Использование предлагаемого устройства позвол ет создавать приборы неразрушающего контрол более высокого класса точности, в том Числе и цифровые, менее критичные к перекосам и перемещени м преобразователей относительно поверхности контролируемых изделий, т. е. создавать конкурентоспособные прибопы дл измерени , например, электропроводности и толщины, дл дефектоскопии металлических изделий.The use of the proposed device allows the creation of non-destructive testing devices of a higher class of accuracy, including digital ones, less critical to distortions and displacements of transducers relative to the surface of the products being tested, i.e., to create competitive instruments for measuring, for example, conductivity and thickness, for flaw detection of metal products.

Claims

1. Eddy current device for non-destructive testing of products from electrical conductors

IT

I i

materials containing the invoice converter, made in the form of coaxially identical to the dimensions of the exciting and at least one

a recording coil, an alternating current source connected to the excitation coil, and a signal processing and indication unit connected to the recording coil, characterized by

That, in order to increase the reliability of the control by reducing the effect of changes in the gap between the transducer and the surface of the test product, the OIO is equipped with a second excitation coil placed condenser with the first and connected to the AC source in antiphase relative to it.

2. A device according to Claim 1, characterized in that the diameter of the second excitation coil is twice the diameter of the first excitation coil.

3. A device according to claim 1, characterized in that the numbers of the ampere-rates of the two excitation coils are chosen to be equal.

Information sources,

taken into account during the examination 1. Dorofeev A. L. and others. Induction thickness gauge. M., “Energie, 1969, p. 136-140.

2. Sobolev, V.S., et al. Overhead and On-Screen Sensors, Siberian Branch of Novosibirsk, “Science, 1967, p. five.