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  • Uvedené zlepšení spektrální analýzy Impact Echo signálu spočívá v rozdělení tohoto signálu na více částí a spektrální analýze každé této části nezávisle. Touto cestou získáme více informací o testovaném tělese. Především kmitočtový posuv není průměrován a může být porovnáván s rezonančním kmitočtem při nízkém vybuzení. Další výhoda spočívá v přímém porovnávání signálů z téhož tělesa oproti porovnávání s obecným standardem. Touto cestou se získává vyšší citlivost na defekty v porovnání se standardními metodami. (cs)
  • The paper presents new NDT method of conducting solids. Tested sample is excited by harmonic electrical and ultrasonic signals with different frequencies. On the defect caused non linearity new harmonic signal is created with frequency given by subtraction of exciting frequencies fE and fU. It was found that the amplitude of the intermodulation component Ui is linear function of electrical excitation and quadratic function of ultrasonic excitation. High sensitivity of this method follows from the fact that the signal giving information on tested sample quality has frequency different from exciting signals. The signal to noise ratio and high sensitivity for NDT analyses is based on the application of special electrical filters. Experimental verification of this method was performed on the samples of aluminum and dural plates and on the thick conducting films, both without and with cracks prepared artificially.
  • The paper presents new NDT method of conducting solids. Tested sample is excited by harmonic electrical and ultrasonic signals with different frequencies. On the defect caused non linearity new harmonic signal is created with frequency given by subtraction of exciting frequencies fE and fU. It was found that the amplitude of the intermodulation component Ui is linear function of electrical excitation and quadratic function of ultrasonic excitation. High sensitivity of this method follows from the fact that the signal giving information on tested sample quality has frequency different from exciting signals. The signal to noise ratio and high sensitivity for NDT analyses is based on the application of special electrical filters. Experimental verification of this method was performed on the samples of aluminum and dural plates and on the thick conducting films, both without and with cracks prepared artificially. (en)
Title
  • NDT of Conducting Solids by Electro-Ultrasonic Spectroscopy
  • NDT of Conducting Solids by Electro-Ultrasonic Spectroscopy (en)
  • NDT vodivých látek pomocí elektro-ultrazvukové spektroskopie (cs)
skos:prefLabel
  • NDT of Conducting Solids by Electro-Ultrasonic Spectroscopy
  • NDT of Conducting Solids by Electro-Ultrasonic Spectroscopy (en)
  • NDT vodivých látek pomocí elektro-ultrazvukové spektroskopie (cs)
skos:notation
  • RIV/60162694:G43__/08:#0001776!RIV09-MO0-G43_____
http://linked.open...avai/riv/aktivita
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  • S
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http://linked.open...aciTvurceVysledku
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http://linked.open...iv/duvernostUdaju
http://linked.open...titaPredkladatele
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  • 381997
http://linked.open...ai/riv/idVysledku
  • RIV/60162694:G43__/08:#0001776
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http://linked.open.../riv/klicovaSlova
  • non-linear spectroscopy, ultrasonic, cracks, metal body, electrical excitation (en)
http://linked.open.../riv/klicoveSlovo
http://linked.open...ontrolniKodProRIV
  • [AE18B7F9211D]
http://linked.open...v/mistoKonaniAkce
  • Stockholm, Švédsko
http://linked.open...i/riv/mistoVydani
  • USA
http://linked.open...i/riv/nazevZdroje
  • Proceedings of the International Symposium 18th ISNA 2008
http://linked.open...in/vavai/riv/obor
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  • Hájek, Karel
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http://linked.open.../riv/zahajeniAkce
issn
  • 0094-243X
number of pages
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  • American Institute of Physic
https://schema.org/isbn
  • 978-0-7354-0544-8
http://localhost/t...ganizacniJednotka
  • G43
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