A constant-flow calorimeter for the measurement of acoustic power at megahertz frequencies
- 1 May 1977
- journal article
- Published by IOP Publishing in Physics in Medicine & Biology
- Vol. 22 (3) , 444-450
- https://doi.org/10.1088/0031-9155/22/3/005
Abstract
The calorimeter absorbs, in a flow of castor oil, a fraction of the acoustic power output of an ultrasound transducer. It has been used to measure powere of between 1 mW and 10 W at frequencies from 1-5 to 3 MHz. Examples are given of results obtained for an ultrasound therapy unit and an ultrasonic pulse--echo scanner. Sources of inaccuracy are defined. It appears that constant-flow calorimetry offers a potentially very sensitive method for the absolute measurement of acoustic power.Keywords
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