IEC_TS_61949-2007.pdf

IEC/TS 61949Edition 1.0 2007-11TECHNICAL SPECIFICATION Ultrasonics Field characterization In situ exposure estimation in finite-amplitude ultrasonic beams IEC/TS 61949:2007(E)LICENSED TO MECON Limited.-RANCHI/BANGALOREFOR INTERNAL USE AT THIS LOCATION ONLY,SUPPLIED BY BOOK SUPPLY BUREAU.THIS PUBLICATION IS COPYRIGHT PROTECTED Copyright 2007 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 or mechanical,including photocopying and microfilm,without permission in writing from either IEC or IECs member National Committee in the country of the requester.If you have any questions about IEC copyright or have an enquiry about obtaining additional rights to this publication,please contact the address below or your local IEC member National Committee for further information.IEC Central Office 3,rue de Varemb CH-1211 Geneva 20 Switzerland Email:inmailiec.ch Web:www.iec.ch About the IEC The International Electrotechnical Commission(IEC)is the leading global organization that prepares and publishes International Standards for all electrical,electronic and related technologies.About IEC publications The technical content of IEC publications is kept under constant review by the IEC.Please make sure that you have the latest edition,a corrigenda or an amendment might have been published.?Catalogue of IEC publications:www.iec.ch/searchpub The IEC on-line Catalogue enables you to search by a variety of criteria(reference number,text,technical committee,).It also gives information on projects,withdrawn and replaced publications.?IEC Just Published:www.iec.ch/online_news/justpub Stay up to date on all new IEC publications.Just Published details twice a month all new publications released.Available on-line and also by email.?Electropedia:www.electropedia.org The worlds leading online dictionary of electronic and electrical terms containing more than 20 000 terms and definitions in English and French,with equivalent terms in additional languages.Also known as the International Electrotechnical Vocabulary online.?Customer Service Centre:www.iec.ch/webstore/custserv If you wish to give us your feedback on this publication or need further assistance,please visit the Customer Service Centre FAQ or contact us:Email:csciec.ch Tel.:+41 22 919 02 11 Fax:+41 22 919 03 00 LICENSED TO MECON Limited.-RANCHI/BANGALOREFOR INTERNAL USE AT THIS LOCATION ONLY,SUPPLIED BY BOOK SUPPLY BUREAU.IEC/TS 61949Edition 1.0 2007-11TECHNICAL SPECIFICATION Ultrasonics Field characterization In situ exposure estimation in finite-amplitude ultrasonic beams INTERNATIONAL ELECTROTECHNICAL COMMISSION VICS 17.140.50 PRICE CODEISBN 2-8318-9463-8LICENSED TO MECON Limited.-RANCHI/BANGALOREFOR INTERNAL USE AT THIS LOCATION ONLY,SUPPLIED BY BOOK SUPPLY BUREAU.2 TS 61949 IEC:2007(E)CONTENTS FOREWORD.3 INTRODUCTION.5 1 Scope.6 2 Normative references.6 3 Terms and definitions.6 4 List of symbols.10 5 Equipment required.11 6 Test methods.11 6.1 Establishing quasi-linear conditions.11 6.1.1 The local distortion parameter.11 6.1.2 Upper limit for quasi-linear conditions for q.12 6.1.3 Range of applicability for quasi-linear conditions.12 6.2 Measurement procedure for estimated in situ exposure.13 6.2.1 Identification of quasi-linear conditions.13 6.2.2 Tables of limiting mean peak acoustic pressure.14 6.2.3 Measurement of acoustic quantities under quasi-linear conditions.14 6.2.4 Measurement of the scaling factor.14 6.2.5 Calculation of attenuated acoustic quantities.15 6.3 Uncertainties.16 Annex A(informative)Review of evidence.18 Annex B(informative)Review of alternative methods for managing finite-amplitude effects during field measurement.21 Annex C(informative)Parameters to quantify nonlinearity.23 Annex D(informative)Tables of upper limits for mean peak acoustic pressure for quasi-linear conditions.26 Bibliography.30 Figure 1 Flow diagram for obtaining values of attenuated acoustic quantities.13 Table A.1 Experimental evidence of nonlinear loss associated with the propagation of ultrasound pulses under diagnostic conditions in water.19 Table A.2 Theoretical evidence of nonlinear loss associated with the propagation of ultrasound pulses under diagnostic conditions in water.19 Table B.1 Methods for estimation of in-situ exposure in nonlinear beams.22 Table C.1 Parameters for quantification of nonlinearity in an ultrasonic field.23 Table D.1 The upper limit for mean peak acoustic pressure(MPa)associated with quasi-linear conditions.q 0,5.Acoustic working frequency,fawf=2,0 MHz.26 Table D.2 The upper limit for mean peak acoustic pressure(MPa)associated with quasi-linear conditions.q 0,5.Acoustic working frequency,fawf=3,5 MHz.27 Table D.3 The upper limit for mean peak acoustic pressure(MPa)associated with quasi-linear conditions.q 0,5.Acoustic working frequency,fawf=5,0 MHz.28 Table D.4 The upper limit for mean peak acoustic pressure(MPa)associated with qua