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ISRN Mechanical EngineeringVolume 2011 2011, Article ID 371514, 8 pages

Research ArticleUral Division of RAS, Institute of Metal Physics, 18 S. Kovalevskaya Street, Ekaterinburg 620041, Russia

Received 4 August 2011; Accepted 29 August 2011

Academic Editor: J. Hu

Copyright © 2011 Anatoly B. Rinkevich et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The analysis of interaction of ultrasonic pulses with different reflectors which are located in elastic media is carried out. A parameter which allows estimating the form of reflector is instantaneous frequency of pulse-echo. This parameter is an unsteady pulse echo characteristic. Instantaneous frequency determination algorithm is to use wavelet transformation which has increased noise immunity. It is shown that the instantaneous frequency value for a pulse echo is often shifted from a rated frequency of piezoelectric transducer. Difference between the frequencies extensively depends on the reflector form.





Autor: Anatoly B. Rinkevich, Olga V. Nemytova, and Dmitry V. Perov

Fuente: https://www.hindawi.com/



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