Informatics Publishing Limited

Vladimir K. Kachanov ¹, Igor V. Sokolov ¹, Alexey A. Sinitsyn ¹, Maksim B. Fedorov ¹, Michael A. Karavaev ¹, Roman V. Kontsov ¹

Affiliations
1 National Research University, Moscow Power Engineering Institute, Electrical Engineering Faculty, Moscow, RU

Abstract

The results of analysis of the possibilities to use Complex-Modulated radio pulses as probing signals in US flaw detection are given. It is shown that the application of Complex-Modulated echo signals in the receiving path optimal filters improves the basic parameters of the echo control method – sensitivity and resolution capability, and, in presence of white noise and not correlated interference, generally increases the reliability of the testing method.

Keywords

Complex-Modulated Signals, Electro acoustic Pickup, Frequency-Modulated Pulse, Optimal Filtering, Phase- Shift Keyed Signal, US Flaw Detection

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Vladimir K. Kachanov ¹, Igor V. Sokolov ¹, Alexey A. Sinitsyn ¹, Maksim B. Fedorov ¹, Michael A. Karavaev ¹

Affiliations
1 Moscow Power Engineering Institute (National Research University), Russia

Abstract

Background/Objectives: The use of simple radio-technical processing of signals – synchronous detection – in the ultrasonic testing of products with large frequency-dependent attenuation of ultrasound is considered. Methods: The use of radar in the ultrasonic flaw detection methods allows for control of objects with a high level of attenuation of ultrasonic vibrations in a material. Findings: It is demonstrated that synchronous detection increases the accuracy of echo signal temporal position measurement and increases the reliability of US testing in the presence of narrowband interference and the correlation with the probing signal of the electroacoustic pickup. Improvements: The use of synchronous detection will significantly increase the sensitivity and noise immunity of the ultrasound equipment used to control the complex structural materials with high attenuation of ultrasound, such as concrete, cast iron, plastic, etc.

Keywords

Ultrasonic Flaw Detection, Synchronous Detection, Optimal Filtering, Complex-Modulated Signals, Electroacoustic Pickup.

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