Electromagnetic and Acoustic Emission Fine Spectra

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216305%3A26220%2F06%3APU63045" target="_blank" >RIV/00216305:26220/06:PU63045 - 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 and Acoustic Emission Fine Spectra

Original language description

The new measuring method for detection of small cracks fine spectra of electromagnetic and acoustic emission (EME and AE) signals is described. It requires wide band ultra-low noise amplifiers, analogy filters, optimization of signal to noise ratio of sensors and application of noise elimination methods. The analyses of noise sources in sensors and preamplifiers are given. They are thermal noise, polarization noise and low frequency 1/f noise. Measuring set-up background noise suppression including electromagnetic shielding allows us to detect signals in the range of 100 nV. This measuring set-up was used to observe crack creation in granite samples. AE and EME signals show different behaviour in the first interval of about 10 &#61549;s just after crack creation. In frequency domain EME spectra show that in the first stage of crack creation the spectrum is given by crack walls eigen vibration, internal friction and sample electrical conductivity. We observed that crack opening and crac

Czech name

Jemné Spektrum Elektromagnetické a Akustické Emise

Czech description

The new measuring method for detection of small cracks fine spectra of electromagnetic and acoustic emission (EME and AE) signals is described. It requires wide band ultra-low noise amplifiers, analogy filters, optimization of signal to noise ratio of sensors and application of noise elimination methods. The analyses of noise sources in sensors and preamplifiers are given. They are thermal noise, polarization noise and low frequency 1/f noise. Measuring set-up background noise suppression including electromagnetic shielding allows us to detect signals in the range of 100 nV. This measuring set-up was used to observe crack creation in granite samples. AE and EME signals show different behaviour in the first interval of about 10 &#61549;s just after crack creation. In frequency domain EME spectra show that in the first stage of crack creation the spectrum is given by crack walls eigen vibration, internal friction and sample electrical conductivity. We observed that crack opening and crac

Type

D - Article in proceedings

CEP classification

BM - Solid-state physics and magnetism

OECD FORD branch

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Project

<a href="/en/project/GA102%2F06%2F0866" target="_blank" >GA102/06/0866: Nonlinear electroultrasonic spectroscopy of solids</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>Z - Vyzkumny zamer (s odkazem do CEZ)

Publication year

2006

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Article name in the collection

Acoustic Emission Testing

ISBN

0-87849-420-0

ISSN

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e-ISSN

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Number of pages

6

Pages from-to

169-174

Publisher name

Trans Tech Publications

Place of publication

Cardiff, Wales, UK

Event location

Cardiff, Wales, United Kingdom

Event date

Sep 19, 2006

Type of event by nationality

EUR - Evropská akce

UT code for WoS article

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