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National Repository of Grey Literature 2 records found  Search took 0.00 seconds. 
Optické interferometrické metody využité pro studium interakcí akustických vln s nehomogenitami materiálu
 Trnka, Jan ; Dvořáková, Pavla
The paper is concerned with interpretation of transient wave phenomena occurring in impacted thin plate with simple structural inhomogenities. Wave phenomena in the vicinity the hole or the added mass, is studied by means of simultaneous application of the double pulse ESPI and D-CH laservibrometry. FFT is used to analyse point-wise history of velocity or displacements in frequency domain.
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Zrání sýrů sledované pomocí akustických metod
 Severa, L. ; Nedomová, Š. ; Trnka, Jan ; Dvořáková, Pavla ; Buchar, J.
The objective of this study consists in the assessement the suitability of using the acoustic impulse-response technique to evaluate Edam cheese texture and maturity. The acoustic response - history of the surface displacement and the surface velocities were detected by the double-channel laser-vibrometer. The history of the impact force has been also recorded. The non-destructive impact tests could be useful for predicting cheese ripening.
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