Publication result detail

Acoustic and electromagnetic emission sources characterization

ŠIKULA, J., PAVELKA, J., KOKTAVÝ, P., MAJZNER, J.

Original Title

Acoustic and electromagnetic emission sources characterization

English Title

Acoustic and electromagnetic emission sources characterization

Type

Paper in proceedings (conference paper)

Original Abstract

Cracks creation is accompanied by emission of phonons and by electric charge redistribution due to chemical bonds loosen. Sample dimensions and velocity of wave propagation determine vibration frequencies. Electric charges on crack walls create a dipole momentum and crack wall vibrations produce time dependent electric and magnetic fields. An electric signal is induced on metal electrodes and after its analysis is carried out information on the crack wall movement can be obtained. For crack lengths below 1 mm the respective electrical signal has a frequency of over 2 MHz. In this paper the frequency analysis was performed in frequency band up to 2 MHz.

English abstract

Cracks creation is accompanied by emission of phonons and by electric charge redistribution due to chemical bonds loosen. Sample dimensions and velocity of wave propagation determine vibration frequencies. Electric charges on crack walls create a dipole momentum and crack wall vibrations produce time dependent electric and magnetic fields. An electric signal is induced on metal electrodes and after its analysis is carried out information on the crack wall movement can be obtained. For crack lengths below 1 mm the respective electrical signal has a frequency of over 2 MHz. In this paper the frequency analysis was performed in frequency band up to 2 MHz.

Keywords

acoustic, electromagnetic, emission, sources characterisation

Key words in English

acoustic, electromagnetic, emission, sources characterisation

Authors

ŠIKULA, J., PAVELKA, J., KOKTAVÝ, P., MAJZNER, J.

Released

01.01.2003

Publisher

Technical University of Brno

Location

Brno

ISBN

80-7204-318-8

Book

Workshop NDT CMC 2003 - Non-Destructive Testing of Civil Materials and Constructions - Proceedings

Pages from

151

Pages count

6

BibTex

@inproceedings{BUT9247,
  author="Josef {Šikula} and Jan {Pavelka} and Pavel {Koktavý} and Jiří {Majzner}",
  title="Acoustic and electromagnetic emission sources characterization",
  booktitle="Workshop NDT CMC 2003 - Non-Destructive Testing of Civil Materials and Constructions - Proceedings",
  year="2003",
  number="1",
  pages="6",
  publisher="Technical University of Brno",
  address="Brno",
  isbn="80-7204-318-8"
}