STATISTICAL ANALYSIS OF DIFFERENT ABSORBING TARGETS FOR ULTRASONIC RADIATION FORCE MEASUREMENT

Rodrigo P. B. Costa-Félix, André V. Alvarenga

Abstract

Ultrasonic power measurement in the megahertz frequency range is undertaken according to the physical principle of radiation force. In this case, a device named "radiation force balance" is habitually used for output powers lower than about 20 W. The construction of a radiation force balance presupposes the use of either a reflecting or an absorbing target. In this paper, it is detailed a statistical analysis of 5 different absorbing targets used in an implementation of a radiation force balance measurement device. The output frequency was 3.5 MHz, and two transducers (nominal diameter of 25.4 mm and 12.7 mm) were used at nominal output power of 10 mW, 100 mW and 1 W. The measured quantities were output power and conductance radiation. Using the standard error <i>E</i>_n as parameter, in for all output setup combinations (output power and transducer diameter) the results for both quantities were considered statistically identical ( <i>E</i>_n < 1.0 ).

Keywords

ultrasound, power measurement, statistical analysis, absorbing target, metrology

Download

IMEKO-WC-2012-TC22-P5.pdf

DOI

-

IMEKO TC

TC22 - Vibration Measurement

Back to the proceedings