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, Roman V. Kontsov ¹

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

Abstract

Background/Objectives: The article discusses problems of isolating signals from the structural noise correlated with a sounding signal using the ultrasonic echo method of measuring the thickness of large items with complex structure. Methods: The article demonstrates that in addition to spatial decorrelation of the bottom signal and the interference correlated with it, it is possible to use algorithmic decorrelation by using phased arrays and the signal processing algorithm which searches for the reflecting planes. Findings: Preliminary spatial correlation of the “useful” signal from structural noise is a condition for signal isolation. Measurement of the thickness of large, complexly structured concrete items is used to demonstrate that the use of the “focusing on a plane” algorithm will improve the bottom signal/structural noise ratio and thus increase the measurable thickness of the concrete items. Applications/ Improvements: The use of the algorithm, "focusing on the plane" in modern thickness gauges and scanners applied for monitoring concrete structures can significantly increase the reliability and accuracy of defect detection.

Keywords

Focusing on a Spot, Focusing on a Plane, Structural Noise, Tomography, Ultrasonic Phased Array.

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