Naslov
Ultrasonic power measurements in the nonlinear regime using calorimetry method

Autori
Petošić, Antonio ; Štimac, Tihomir ; Svilar, Dragoljub

Vrsta, podvrsta i kategorija rada
Radovi u zbornicima skupova, cjeloviti rad (in extenso), znanstveni

Izvornik
3rd Congress of the Alps Adria Acoustics Association September : proceedings / - , 2007

Skup
Congress of the Alps Adria Acoustics Association September (3 ; 2007)

Mjesto i datum
Graz, Austrija, 27.09.2007. - 28.09.2007

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
ultrasound; ultrasonic power measurements

Sažetak
In this work output acoustic power radiated from an ultrasound source has been measured assuming that all radiated ultrasound energy has been converted into heat in the small volume of the liquid. The sonotrode tip has been assumed as a point source and its output acoustic power can be measured at the linear regime in the free far field, measuring the dynamic pressure. In the nonlinear regimes when cavitation is present, the better way is measuring total heat energy delivered by the ultrasonic device into volume of liquid in the specified time. The temperature in the calorimetric system when the source is on, increases exponentially depending on the total specific heat capacity and heat losses in the system. The losses in the non-ideal calorimeter effecting the results for unknown acoustic power can be estimated using well-known power of the equivalent heater source which power is approximately same as the acoustic power of unknown ultrasound device. Calorimeters with different geometry have been characterized experimetally and theoretically and unknown output acoustic power has been found for few different measurement setups. The influence of two different temperature sensors with different resolution on measurement results has also been considered.

Izvorni jezik
Engleski

Znanstvena područja
Elektrotehnika, Kliničke medicinske znanosti

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