BS ISO BRITISH STANDARD 20998-1:2006 Measurement and characterization of particles by acoustic methods Part l: Concepts and procedures in ultrasonic attenuation spectroscopy ICS 19.120 BSi NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW British Standards BSIS020998-1:2006 National foreword This British Standard was published by BSI. It is the UK implementation of ISO 20998-1:2006. The UK participation in its preparation was entrusted to Technical Committee LBI/37, Sieves, screens and particle sizing. A list of organizations represented on LBI/37 can be obtained on request to its secretary. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard cannot confer immunity from legal obligations. This British Standard was Amendmentsissued sincepublication published underthe authority of the Standards Policyand Date Amd. No. Comments Strategy Committee 0n 29 September 2006 @ BSI 2006 ISBN0580492699 BS ISO 20998-1:2006 INTERNATIONAL ISO STANDARD 20998-1 First edition 2006-08-01 Measurementandcharacterizationof particles by acoustic methods - Part 1: Concepts and procedures in ultrasonic attenuation spectroscopy Mesurage et caracterisation des particules par des methodes acoustiques Partie 1: Concepts et modes operatoires en spectroscopie d'attenuation ultrasonique Reference number ISO 20998-1:2006(E) i BSIS020998-1:2006 Contents Page Foreword. IV Introductior 1 Scope 2 Terms and definitions 3 Sampling and reference materials .... 3.1 Sampling considerations. 3.2 Reference materials. 4 Methods 4.1 Principles 4.2 Apparatus 4.3 Preparation. 4.4 Measurement 4.5 Interpretation of measurement data ... 5 Reporting of results..... 5.1 Reportsforlaboratorytesting... 10 5.2 Resultsforin-processandcontrolapplications. 10 AnnexA(informative)Techniques 11 AnnexB(informative)Applicationexamples... 17 Annex C(informative)Inversion ofattenuation spectrum.. 18 Bibliography... 20 ii BSISO20998-1:2006 Foreword IsO (the International Organization for Standardization) is a worldwide federation of national standards bodies technical committees. Each member body interested in a subject for which a technical committee has been InternationalElectrotechnicalCommission(lEC)onallmattersofelectrotechnicalstandardization. International Standards are drafted in accordance with the rules given in the ISO/lEC Directives, Part 2 The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least75%of the memberbodies casting a vote Attention is drawn to the possibility that some of the elements of this document may be the subject of patent ISO 20998-1 was prepared by Technical Committee ISO/TC 24, Sieves, sieving and other sizing methods Subcommittee SC 4, Sizing by methods otherthan sieving. Iso 20998 consists of the following parts, under the general title Measurement and characterization of particlesbyacousticmethods: Part1:Conceptsandprocedures inultrasonicattenuationspectroscopy The following parts are under preparation: Part 2: Guidelines for linear theory Part3:Guidelinesfornon-lineartheory iv BSIS020998-1:2006 Introduction It is well known that ultrasonic spectroscopy can be used to measure particle size distribution (PsD) in colloids dispersions, and emulsions (see [6][7][8][9]). The basic concept is to measure the frequency-dependent concentration of dispersed material determines the attenuation spectrum Once this connection is established by empirical observation or by theoretical calculations, one can in principle estimate concentrated slurries and emulsions. Traditionally, such measurements have been made off-line in a quality By making in-process ultrasonic measurements at full concentration, one does not risk altering the