This document: 
• defines key quantities relevant to ultrasonic materials characterization;  
• specifies methods for direct measurement of many key ultrasonic materials parameters. 
This document is applicable to all measurements of properties of passive acoustic materials under drive conditions that are not subject to nonlinear acoustic propagation. Whilst there are materials properties that may be of interest in a nonlinear drive regime, these are currently outside the scope of this document.dition 1.0 2019-12 TECHNICAL SPECIFICATION colour inside Ultrasonics – Methods for the characterization of the ultrasonic properties of materials IEC TS 63081:2019-12(en) THIS PUBLICATION IS COPYRIGHT PROTECTED Copyright ？ 2019 IEC, Geneva, Switzerland All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic o