Detail publikace

Electro Ultrasonic Spectroscopy of Magnesium Composites

TOFEL, P. ŠIKULA, J. SEDLÁKOVÁ, V. TRČKA, T.

Originální název

Electro Ultrasonic Spectroscopy of Magnesium Composites

Typ

článek v časopise - ostatní, Jost

Jazyk

angličtina

Originální abstrakt

The electro-ultrasonic spectroscopy was used as a non-destructive testing method for the magnesium composites evaluation. AC current varying with frequency fE and the ultrasonic signal varying with frequency fU are applied on the conducting sample and a new intermodulation signal on the frequency fm given by the superposition or subtraction of exciting frequencies is measured on the sample. We have measured on intermodulation frequency fm = fE - fU. This method can be used as a diagnostic tool for the quality and reliability assessment. The sample resistance is influenced by the ultrasonic signal. The ultrasonic signal changes the contact area between the conducting grains in the sample structure and then resistance is modulated by the frequency of ultrasonic excitation. The electrical charge and also the electrical current flowing through the sample structure are conserved. In case the contact area between the conducting grains is changing then the current density is changed. This leads to the resistivity change of measured structure. We suppose that for the sample with more defects in the structure the influence of the ultrasonic signal is more pronounced and the resistance change is higher.

Klíčová slova

Electric signal, ultrasonic signal, resistance change

Autoři

TOFEL, P.; ŠIKULA, J.; SEDLÁKOVÁ, V.; TRČKA, T.

Rok RIV

2010

Vydáno

1. 5. 2010

ISSN

0447-6441

Periodikum

Jemná mechanika a optika

Ročník

55

Číslo

5/2010

Stát

Česká republika

Strany od

142

Strany do

144

Strany počet

3

BibTex

@article{BUT48102,
  author="Pavel {Tofel} and Josef {Šikula} and Vlasta {Sedláková} and Tomáš {Trčka}",
  title="Electro Ultrasonic Spectroscopy of Magnesium Composites",
  journal="Jemná mechanika a optika",
  year="2010",
  volume="55",
  number="5/2010",
  pages="142--144",
  issn="0447-6441"
}