Low Frequencies for Cardboard Quality Assurance

Zoran Ebersold; Nebojša Mitrović; Slobodan Đukić; Aleksandar Peulić; Dragiša Obradović

doi:10.3139/120.110417

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Low Frequencies for Cardboard Quality Assurance

Zoran Ebersold , Nebojša Mitrović , Slobodan Đukić , Aleksandar Peulić und Dragiša Obradović

Veröffentlicht/Copyright: 26. Mai 2013

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Abstract

During the ultrasound defectoscopy the ultrasound absorption factor inside the material is raised to the fourth power of frequency. In conjunction with the previously stated, the attenuation of the sound signal which is caused by the reflections of the sound inside the sample, the application of high frequency ultrasound in porous and hollow materials is very limited or even impossible. The frequencies are the reason for this, because they are in the range of just several megahertz, which are currently the main trend in the ultrasound examination. This paper presents a principle of this new method, including the experimental results from its application on the typical represent of product packaging material. Also, it is shown that the expressed absorption of ultrasound waves from porous and hollow structures can be avoided by applying the method with such low frequencies.

Kurzfassung

Bei der Ultraschall-Werkstoffprüfung steigt die Schallabsorption in Festkörpern mit der vierten Potenz der Schallfrequenz. In Verbindung mit zusätzlicher Schallschwächung durch Reflexionen im Inneren des Prüfstücks, führt dieser Umstand dazu, dass die Anwendung von hochfrequenten Ultraschall in porösen Materialien im hohen Masse begrenzt oder sogar unmöglich wird. Der Hintergrund ist, dass Frequenzen der Größenordnung von mehreren Megahertz momentan der Haupttrend innerhalb der Ultraschall-Werkstoffprüfung sind. Dieser Artikel stellt eine neuartige Methode der Ultraschall-Werkstoffprüfung vor, die wesentlich geringere Frequenzen nutzt. Es wird das Prinzip dieser neuen Methode vorgestellt, samt des experimentellen Ergebnisses, angewandt auf einem Prüfstück aus gängiger poröser Verpackungskartonage. Darüber hinaus wird gezeigt, dass durch die Anwendung von solch niedrigen Frequenzen bei dieser Methode, Ultraschall-Absorption durch poröse und hohe Strukturen vermieden werden kann.

Zoran Ebersold was born in 1960. He received his MSc degree in electrical engineering and computer science at the Faculty of Technical Science in Čačak, University of Kragujevac, Serbia. He is adjunct professor at the University of Applied Sciences Augsburg, Germany and member of the author group of “VDI 4500”. His research interest is ultrasonic defectoscopy.

Nebojša Mitrović was born in 1962. He received his PhD degree in solid state physics (structural investigations and characterization of amorphous and nanocrystalline alloys). He is full professor in physics at the Faculty of Technical Science in Čačak, University of Kragujevac, Serbia. His research interest are amorphous systems, magnetic materials, and ultrasonic defectoscopy.

Slobodan Djukić was born in 1950. He received his PhD degree in electronics at Technical Faculty of technical Science in Čačak, University of Kragujevac, Serbia. He is full professor in electronics at Faculty of Technical Science in Čačak, University of Kragujevac, Serbia, and he is author of many scientific journal papers and conference reports. His research interest is current mode processing.

Aleksandar Peulić was born in 1969. He received his PhD degree in electrical engineering from the University of Kragujevac, Serbia. From 2008 to 2009 he had a postdoctoral education at the University of Alabama in Huntsville, USA. He is associate professor at the Faculty of Technical Science, University of Kragujevac, Serbia. His research interests include microcontroller systems, wearable sensors, bioengineering, software engineering, and intelligent information systems.

Dragiša Obrdović was born in 1950. He received his PhD degree in industrial management at the Faculty of Industrial Management, University Megatrend Belgrade, Serbia. He is associate professor at the Faculty of Industrial Management in Kruševac, Serbia and associate professor at University of Novi Sad, Serbia. His research interests are graphic design an technology as well as future trends of industrial management.

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Published Online: 2013-05-26

Published in Print: 2013-02-01

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https://doi.org/10.3139/120.110417