National Repository of Grey Literature 3 records found  Search took 0.01 seconds. 
Nelineární časově reversní ultrazvuková-tomografie
Převorovský, Zdeněk ; Krofta, Josef ; Převorovský, David
Nonlinear Elastic Wave Spectroscopy (NEWS) becomes new effective method for non-destructive testing of complex structures providing high sensitivity of damage detection. One of the most promising NEWS procedures is Nonlinear Time Reversal Acoustics (NLTRA) realizable in a lot of different ways. Common NLTRA procedure is mostly global, which means that localization of defect by this procedure can be often difficult. A modification of NLTRA is proposed in this paper, based on similar arrangement as ultrasonic tomography. Computer controlled switching between transmitting and receiving transducers is realized by specially designed high-voltage relay multiplexer.
Acoustic emission characteristic of surface friction bio-medical application
Převorovský, David ; Převorovský, Zdeněk ; Asserin, J. ; Varchon, D.
The paper describes the use of acoustic emission techniques in a study of surface friction properties.

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