ISO INTERNATIONAL STANDARD 18405 First edition 2017-04 Underwater acoustics - Terminology Acoustique sous-marine-Terminologie Reference number IS0 18405:2017(E) International Organization for Standardization e=ZHEJIANG INST OF STANDARDIZATION C1 5956617 @IS02017 vided by IHS under lic itted without license from IHS IS0 18405:2017(E) COPYRIGHTPROTECTEDDOCUMENT IS02017,PublishedinSwitzerland All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below or ISO's member body in the country of therequester. ISOcopyrightoffice Ch. de Blandonnet 8 . CP 401 CH-1214 Vernier, Geneva, Switzerland Tel. +41 22 749 01 11 Fax +41 22 749 09 47 copyright@iso.org www.iso.org Intenatinair PrganizationforStandardization icensee-ZHEJIANG INSTOF STANDARDIZAoISQ7 -All rights reserved Not for Resale, 2017/8/21 02:35:39 etworking permitted without license from IHS IS0 18405:2017(E) Contents Page Foreword ..iv Introduction.. ..V 1 Scope. ..1 2 Normative references 3 Terms and definitions 3.1 General terms... .1 3.1.1 General 3.1.2 Acoustical field quantities 2 3.1.3 Acoustical power quantities 3.1.4 Logarithmic frequency intervals ..10 3.1.5 Other acoustical quantities. .11 3.2 Levels used in underwater acoustics.. ..13 3.2.1 Levels of acoustical power quantities ..13 3.2.2 Levels of acoustical field quantities ..16 3.3 Terms for properties of underwater sound sources ..17 3.3.1 Sourcewaveformsandfactors.. ..17 3.3.2 Sourcelevels .21 3.4 Terms related to propagation and scattering of underwater sound. .23 3.4.1 Propagation ..23 3.4.2 Scattering. ..24 3.5 Terms for properties ofunderwater sound signals .27 3.5.1 Sound signals .27 3.6 Terms related to sonar equations. 29 3.6.1 General .29 3.6.2 Sonar equations and sonar equation terms .31 3.7 Terms related to underwater bioacoustics 35 3.7.1 Auditory frequency weighting. ..35 3.7.2 Sound reception. .38 3.7.3 Soundproduction ..42 Annex A (informative) Alphabetical index ..43 Bibliography .50 iii ee=ZHEJIANG INST OF STANDARDIZATION C1 5956617 ithout license from IHS Not for Resale, 2017/8/21 02:35:39