Title: Improved signal to noise ratio of electro-ultrasonic spectroscopy
Authors: Šikula, Josef
Hájek, Karel
Sedláková, Vlasta
Tofel, Pavel
Majzner, Jiří
Citation: Electroscope. 2008, Konference EDS 2008.
EDS '08 IMAPS CS International Conference Proceedings. Brno, VUT v Brně, 2008.
Issue Date: 2008
Publisher: Západočeská univerzita v Plzni, Fakulta elektrotechnická
Document type: článek
konferenční příspěvek
ISBN: 978-80-214-3717-3
ISSN: 1802-4564
Keywords: elektro-ultrazvuková spektroskopie;signál;šum
Keywords in different language: electro-ultrasonic spectroscopy;signal;noise
Abstract in different language: The paper presents signal to noise consideration of a new NDT method. Tested sample is excited by electrical and ultrasonic signals with different frequencies. On the defect new harmonic signal is created with frequency given by subtraction of exciting frequencies fE and fU. High sensitivity of this method follows from the fact that the signal giving information on tested sample quality has frequency different from exciting signals. The signal to noise ratio and high sensitivity for NDT analyses is based on the application of special electrical filters. The theoretical sensitivity of this method and its limitation by parasitic effects is analyzed. Therefore the new variants of circuitry are designed and used for experimental verifying. First of all the equivalent dynamic range and final sensitivity is improved using linear filters to reduce the level of exciting signals in the amplifier input and by noise in exciting electrical signal reducing. The usability of this principle and possibility of minimization of parasitic effects are confirmed by practical experiments.
Rights: Copyright © 2007-2010 Electroscope. All Rights Reserved.
Appears in Collections:2008
Konference EDS 2008 (2008)

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