Cílem projektu je rozšířit naše znalosti nelineárních efektů vznikajících při šíření ultrazvukového vlnění v pevných látkách. Současné metody ultrazvukového nedestruktivního testování materiálů jsou založeny na analýze odrazu, absorpce a inference elastických vln.V důsledku přítomnosti defektů není potenciální energie atomů přesně harmonická a vznikající signály druhé a třetí harmonické frekvence.Ultrazvuková spektroskopie je efektivní nástroj studia defektů a trhlin v pevných látkách.

Description in English
Project is designed to improve our knowledge of non-linearity effects arising by propagation of ultrasonic waves in solids. Present ultrasonic non-destructive testing methods of material are based on analysis of elastic waves reflection, absorption andinterference. Defects are sources of the anharmonic atom potential energy and due to this anharmonicity second and third harmonic signals are produced. Ultrasonic spectroscopy is effective tool to study total number of cracks and defects in solid sample.Combination of non-linear ultrasonic spectroscopy with acoustic and electromagnetic emission will improve material and structure characterisation. While electromagnetic and acoustic emission give information on the position of only new createdcracks/defects, this proposed method of non-linear ultrasonic spectroscopy is sensitive to all such defects and then can give information on the material quality and reliability. It can be used as a precursory phenomena for lifetime of bridges and other

GA205/03/0071

Czech

Šikula Josef, prof. Ing. RNDr., DrSc. - principal person responsible
Lokajíček Tomáš, ing, CSc - fellow researcher
Převorovský Zdeněk, Ing., CSc. - fellow researcher
Trojanová Zuzanka, prof. RNDr., DrSc. - fellow researcher

Department of Physics
- responsible department (1.1.1989 - not assigned)
Department of Physics
- beneficiary (13.3.2002 - 31.12.2005)

BRÜSTLOVÁ, J., DOBIS, P., BRÜSTLOVÁ, J.: New Trends in Physics 2004. Brno (11.11.2004)
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Š. Hefner, T. Lokajíček and J. Šikula. Nonlinear Spectroscopy of Rock and Ceramic Samples. NDT Welding Bulletin. 2005. p. 15 ( p.)ISSN: 1213-3825.
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KOKTAVÝ, P.; PAVELKA, J.; ŠIKULA, J. Characterization of acoustic and electromagnetic emission sources. Measurement Science and Technology, 2004, vol. 15, no. 1, p. 973-977. ISSN: 0957-0233.
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J. Majzner, P. Sedlak, J. Sikula, S. Hefner and T. Lokajicek. CRACKS LOCALIZATION BY ELECTROMAGNETIC AND ACOUSTIC EMISSION. In NDT in Progress, IIIrd international workshop of NDT experts Proceedings. Brno: Brno University of Technology, 2005. p. 211 ( p.)ISBN: 80-214-2996-8.
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GRMELA, L.; ŠIKULA, J.; ZAJAČEK, J.; MORAVEC, P. Low Frequency Noise of the CdTe Crystals. In Noise and Fluctuations. Melville, USA: American Institute of Physics, 2005. p. 175-178. ISBN: 0-7354-0267-1.
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Kamil Brabec, Vojtech Morstein, Stepan Hefner, Jan Havranek. Analysis of acoustic signal incidental to ultrasonic cavitation. In EDS 05. Brno: Ing. Zdenek Novotny CSc., Brno, Ondráčkova 105, 2005. p. 154 ( p.)ISBN: 80-214-2990-9.
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KOKTAVÝ, P., KOKTAVÝ, B., ŠIKULA, J. Partial Discharges and Acoustic Emission In Insulating Materials. In Proceedings of 3rd Workshop NDT in Progress, International Meeting of NDT Experts. Průhonice: Czech Society for Non-destructive Testing, 2005. p. 153 ( p.)ISBN: 80-214-2996-8.
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Stepan Hefner, Karel Hajek, Petr Sedlak. ANALYSIS AND APPLICATIONS OF METHODS FOR NONLINEAR ULTRASONIC SPECTROSCOPY. In 5th International Conference of PhD Students. University of Miskolc, Miskolc, Hungary: University of Miskolc, 2005. p. 313 ( p.)ISBN: 9636616787.
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Sedlak Petr, Majzner Jiri and Josef Sikula. PIEZOCERAMIC SENSORS: FINITE ELEMENT MODELLING OF NOISE. In Proceedings of 5th iternational conference of phd students. Miskolc, Hungary: University of Miskolc, 2005. p. 403 ( p.)ISBN: 963-661-678-7.
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Štěpán HEFNER. CHARACTERIZATION OF WAVE INTERACTION FOR NONLINEAR ELASTIC MATERIALS. In Student EEICT 2005. volume 2. Brno: Ing. Zdeněk Novotný CSc., Ondráčkova 105, Brno, 2005. p. 237 ( p.)ISBN: 80-214-2898.
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HEFNER, Š., SEDLÁK, P. Methods for Nonlinear Ultrasonic Spectroscopy. In Student EEICT 2004. Neuveden. Brno: VUT Brno, 2004. p. 592 ( p.)ISBN: 80-214-2636-5.
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SEDLÁK, P., HEFNER, Š. Piezoelectric Sensors: Basic Models. In Student EEICT 2004. Brno: Vysoké učení technické v Brně, FEKT a FIT, 2004. p. 670 ( p.)ISBN: 80-214-2636-5.
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HEFNER, Š., MAJZNER, J., HAVRÁNEK, J., ŠIKULA, J. NOISE CHRACTERISTICS OF PIEZOCERAMICS SAMPLES. In New Trends in Physics. Brno: Ing. Zdenek Novotny CSc, Dndrackova 105, Brno, 2004. p. 36 ( p.)ISBN: 80-7355-024-5.
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HÁJEK, K., KOŘENSKÁ, M., ŠIKULA, J. Zvyšování praktické citlivosti nelineární ultrazvukové spektroskopie pro jeden budící signál. In Defektoskopie 2004. Brno: Brno University of Technology, 2004. s. 51 ( s.)ISBN: 80-214-2749-3.
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KOŘENSKÁ, M., ŠIKULA, J., HÁJEK, K. Nonlinear Ultrasonic Spectroscopy of Fired Roof Tiles. In 16th World Conference on Nondestructive Testing, Book of Abstracts. Montreal: CINDE, 2004. p. 42 ( p.)
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HÁJEK, K., KOŘENSKÁ, M., ŠIKULA, J. Zvyšování praktické citlivosti nelineární ultrazvukové spektroskopie pro jeden budící signál. In Sborník příspěvků 34. mezinárodní konference DEFEKTOSKOPIE 2004. Praha: Czech Society for Non-destruktive Testing, 2004. s. 51 ( s.)ISBN: 80-214-2749-3.
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MORI, Y., OBATA, Y., PAVELKA, J., ŠIKULA, J., LOKAJÍČEK, T. AE Kaiser Effect and Electromagnetic Emission in the Deformation of Rock Sample. In Proceedings of 26th European Conference on Acoustic Emission Testing. Berlin: DGZfP, 2004. p. 167 ( p.)ISBN: 3-931381-58-7.
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SEDLÁK, P., HAVRÁNEK, J. PIEZOCERAMIC SENSORS: IMPEDANCE SPECTRUM IN VIEW OF RESONANT FREQUENCIES. In Nové trendy ve fyzice 2004. brno: Departmnt of physics FEEC, 2004. p. 84 ( p.)ISBN: 80-7355-024-5.
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KOKTAVÝ, P.; ŠIKULA, J. Physical model of electromagnetic emission in solids. In 26th European Conference on Acoustic Emission Testing. Berlin, Germany: Deutche Gesellschaft fur Zerstorungsfreie Prufung E.V., 2004. p. 1111 ( p.)ISBN: 3-931381-58-7.
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SEDLÁK, P., MAJZNER, J., HEFNER, Š., BLÁHA, M. Piezoceramics Sensors: Signal to Noise Ratio. In 3rd European microelectronic and packaging symposium with table top exhibition proceedings. Lanskroun: IMAPS CZ&SK Chapter, 2004. p. 666 ( p.)ISBN: 80-239-2835-X.
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Responsibility: Šikula Josef, prof. Ing. RNDr., DrSc.