Název: Calibration of acoustic emission sensors
Autoři: Kolář, Petr ; Petružálek, Matěj
Typ dokumentu: Příspěvky z konference
Konference/Akce: Technical Computing Prague 2017 /24./, Praha (CZ), 20171108
Rok: 2017
Jazyk: eng
Abstrakt: Measurement of acoustic emission (AE) during laboratory experiments – rock sample loading - is an important tool for study of material mechanical properties as well as understanding of modes of its failure. For correct data processing it is necessary to calibrate used AE sensors. The calibration constants can depend on property of individual sensors, on their contact conditions, etc. As there can be a deformation induced charge in sensor contact condition, the calibration constants may vary with time. AE sources can be modeled (in the same way as natural earthquakes) as double couple sources with use of moment tensor (MT) formalism (3x3 symmetric tensor, i.e. 6 independent values, the problem is linear). We adopted method, which enable calibration of an individual station of a seismic network. The method is based on simultaneous determination of MTs and calibration constant(s). During the experiment there were repeatedly measured velocities of elastic waves by ultrasonic sounding, when AE sensors cyclically acted as sources. We processed this data and for each cycle determined calibration constant for all the sensors but one, which is supposed to be 1. The source is supposed to be of single force type, which further reduces number of determined parameters. The evaluation was performed cyclically for all the sensors, the final calibration constants are then the mean values.
Klíčová slova: acoustic emission; sensors calibration; ultrasonic sounding
Číslo projektu: GA16-03950S (CEP)
Poskytovatel projektu: GA ČR
Zdrojový dokument: Technical Computing Prague 2017. 24rd Annual Conference Proceedings, ISBN 978-80-7592-002-7, ISSN 2336-1662

Instituce: Geofyzikální ústav AV ČR (web)
Informace o dostupnosti dokumentu: Dokument je dostupný v příslušném ústavu Akademie věd ČR.
Původní záznam: http://hdl.handle.net/11104/0277406

Trvalý odkaz NUŠL: http://www.nusl.cz/ntk/nusl-369630


Záznam je zařazen do těchto sbírek:
Věda a výzkum > AV ČR > Geofyzikální ústav
Konferenční materiály > Příspěvky z konference