Community Research and Development Information Service - CORDIS

FP5

Guidance on propagation medium and degassing for ultrasonic power measurements in the range of physiotherapy-level ultrasonic power

Funded under: FP5-GROWTH

Abstract

This guidance is intended to advice users and provides background information on the liquid medium to be used when performing ultrasonic power measurements in the range of physiotherapy-level ultrasonic power. It is well established that measurements of physiotherapy-level ultrasonic power, particularly at frequencies of 1MHz and below, can be strongly affected by acoustic cavitation. Cavitation is the growth, oscillation and collapse of previously existing gas or vapour-filled micro bubbles in a medium. During ultrasonic power measurements, these bubbles will scatter the ultrasound from the transducer under test, causing instabilities and underestimates of the true power. There is thus a need to know when cavitation is occurring during power measurements, and also to define suitable media in which the effects of cavitation may be minimized.

Additional information

Authors: HEKKENBERG R T, Netherlands Organization for Applied Scientific Research Prevention and Health (NL);BEISNER K, Physikalisch-Technische Bundesanstalt (DE);ZEQIRI B, National Physical Laboratory (GB)
Bibliographic Reference: EUR 19511 EN (2000), 25pp.
Availability: Available from OOPEC Sales agents
ISBN: ISBN 92-828-9838-5
Record Number: 200011949 / Last updated on: 2000-05-12
Category: PUBLICATION
Original language: en
Available languages: en