Electromagnetic Emission Signal Generated by a Moving Crack in Solids

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216305%3A26220%2F02%3APU30657" target="_blank" >RIV/00216305:26220/02:PU30657 - isvavai.cz</a>
Result on the web
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DOI - Digital Object Identifier
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Result language
angličtina
Original language name
Electromagnetic Emission Signal Generated by a Moving Crack in Solids
Original language description
When a stress is applied to the solids (rocks or tiles) cracks creation can be detected by signals of an acoustic and electromagnetic emission. The experimental study has been performed on rock samples. Two metallic layers have covered the tested devicesto create metal-insulator-metal structure. During the process of the crack generation the electric charges appeared at the faces of the cracks. The electric dipole system is a source of voltage induced on metal electrodes. Using Shockley-Ramo theorem, the differential equation for induced voltage is derived. We found that voltage on measuring capacitor is directly proportional to the dipole width and its active area. The recorded electric signal is superposition of crack walls "self" vibration given bycrack length and vibration due to an ultrasonic wave given by sample dimensions. The electromagnetic signal precedes the acoustic emission response and time delay corresponds to the difference of propagation velocities of sound and elect
Czech name
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Czech description
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Publication year
2002
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Article name in the collection
Noise and Non-linearity Testing of Modern Electronic Components
ISBN
80-238-9094-8
ISSN
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e-ISSN
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Number of pages
6
Pages from-to
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Publisher name
Ing. Zdeněk Novotný, CSc.
Place of publication
Brno
Event location
Brno
Event date
Sep 12, 2001
Type of event by nationality
WRD - Celosvětová akce
UT code for WoS article
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