RU2013148225A - METHOD FOR NON-DESTRUCTIVE TESTING OF DEFECTS BY USING SURFACE ACOUSTIC WAVES - Google Patents
METHOD FOR NON-DESTRUCTIVE TESTING OF DEFECTS BY USING SURFACE ACOUSTIC WAVES Download PDFInfo
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- RU2013148225A RU2013148225A RU2013148225/28A RU2013148225A RU2013148225A RU 2013148225 A RU2013148225 A RU 2013148225A RU 2013148225/28 A RU2013148225/28 A RU 2013148225/28A RU 2013148225 A RU2013148225 A RU 2013148225A RU 2013148225 A RU2013148225 A RU 2013148225A
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- frequency
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- surface acoustic
- acoustic waves
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- Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
Abstract
Способ неразрушающего контроля дефектов с помощью поверхностных акустических волн, включающий посылку зондирующего электромагнитного сигнала на преобразователь, возбуждающий в контролируемом образце поверхностных акустических волн, отличающийся тем, что на преобразователь периодически подается зондирующий электромагнитный импульс, в котором частота дискретно меняется по линейному закону, производится измерение частотной зависимости комплексного коэффициента отражения S11 этого преобразователя ПАВ и последующее Фурье преобразование полученной частотной зависимости, по которому можно определить местоположение и величину дефекта по амплитуде и задержке отраженных от него ПАВ, причем длительность зондирующего электромагнитного импульса выбирается таким образом, что измерения на каждой частоте ведется некоторое время, за которое ПАВ проходит расстояние большее, чем удвоенное расстояние между преобразователем и дефектом, частота заполнения электромагнитного импульса формируется с помощью цифрового синтезатора частоты.A method of non-destructive testing of defects using surface acoustic waves, including sending a probe electromagnetic signal to a transducer that excites surface acoustic waves in a controlled sample, characterized in that a probe electromagnetic pulse is periodically applied to the transducer, in which the frequency varies discretely according to a linear law, the frequency is measured the dependence of the complex reflection coefficient S11 of this SAW converter and the subsequent Fourier transform the obtained frequency dependence, by which it is possible to determine the location and magnitude of the defect by the amplitude and delay of the SAW reflected from it, and the duration of the probe electromagnetic pulse is selected in such a way that measurements at each frequency take some time, during which the SAW travels a distance greater than twice the distance between the transducer and the defect, the filling frequency of the electromagnetic pulse is formed using a digital frequency synthesizer.
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RU2013148225/28A RU2569039C2 (en) | 2013-10-29 | 2013-10-29 | Method for non-destructive inspection of defects using surface acoustic waves |
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RU2013148225/28A RU2569039C2 (en) | 2013-10-29 | 2013-10-29 | Method for non-destructive inspection of defects using surface acoustic waves |
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RU2013148225A true RU2013148225A (en) | 2015-05-10 |
RU2569039C2 RU2569039C2 (en) | 2015-11-20 |
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RU2013148225/28A RU2569039C2 (en) | 2013-10-29 | 2013-10-29 | Method for non-destructive inspection of defects using surface acoustic waves |
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Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
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CN108169340B (en) * | 2017-12-18 | 2019-06-21 | 中国船舶科学研究中心(中国船舶重工集团公司第七0二研究所) | A kind of electromechanical low frequency acoustic emission transducer |
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SU1226301A1 (en) * | 1984-10-29 | 1986-04-23 | Предприятие П/Я В-8662 | Method of determining depth of surface cracks |
SU1582119A1 (en) * | 1988-09-26 | 1990-07-30 | Предприятие П/Я Г-4806 | Ultrasonic method of determining residual longevity of structure member |
US5767408A (en) * | 1996-09-27 | 1998-06-16 | Industrial Quality, Inc. | Method and system for obtaining near-surface characteristics of materials using ultrasonic Rayleigh waves |
RU2153163C1 (en) * | 1999-11-29 | 2000-07-20 | Долгих Владимир Иванович | Method of intratube ultrasonic diagnostics of condition of pipe-line |
GB2383413B (en) * | 2001-12-21 | 2005-10-26 | Peter Robert Armitage | Apparatus and method for detecting rail defects, using the velocity, attenuation, scattering and frequency absorbing properties of surface acoustic waves |
RU2231057C2 (en) * | 2002-05-13 | 2004-06-20 | Автономная некоммерческая организация "Кузбасский центр сварки" | Process of nondestructive test of degree of damage of metals in used elements of thermal power equipment |
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Effective date: 20191030 |