A constant-flow calorimeter for the measurement of acoustic power at megahertz frequencies.
Phys Med Biol
; 22(3): 444-50, 1977 May.
Article
em En
| MEDLINE
| ID: mdl-866408
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.
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01-internacional
Base de dados:
MEDLINE
Assunto principal:
Ultrassom
Tipo de estudo:
Diagnostic_studies
Idioma:
En
Revista:
Phys Med Biol
Ano de publicação:
1977
Tipo de documento:
Article