ISO INTERNATIONAL STANDARD 19962 First edition 2019-05 Optics and photonics Spectroscopic measurement methods for integrated scattering by plane parallel optical elements Optique et photonique - Methodes de mesure spectroscopique pour la diffusion integrée par des éléments optiques a plans paralleles Reference number ISO 19962:2019(E) rso @IS02019 IS0 19962:2019(E) COPYRIGHTPROTECTEDDOCUMENT @ IS0 2019 All rights reserved. Unless otherwise specified, or required in the context of its implementation, 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 the requester. ISO copyright office CP 401 : Ch. de Blandonnet 8 CH-1214 Vernier, Geneva Phone: +41 22 749 01 11 Fax: +41 22 749 09 47 Email: [email protected] Website: www.iso.org Published in Switzerland ii @ IS0 2019 - All rights reserved IS0 19962:2019(E) Contents Page Foreword ..iv Introduction. ..V 1 Scope. ..1 2 Normative references ..1 3 Terms, definitions and symbols ..1 3.1 Terms and definitions. .1 3.2 Symbols.... ..2 4 Principle .2 5 Measurements using a double-beam spectrophotometer .3 5.1 General .3 5.2 Double-beam spectrophotometer .4 5.2.1 General. .4 5.2.2 Radiation source .4 5.2.3 Optical system 4 5.2.4 Integrating sphere ..5 5.2.5 Detection system. ..5 5.3 Test environment. ..5 6 Specimen preparation. .6 6.1 Specimen .6 6.2 Conditioning of specimen ..6 7 Procedure .6 7.1 Performance certification of double-beam spectrophotometer ..6 7.2 Measurementofbaseline .6 7.3 Specimen mounting .7 7.4 Measurement of specimen transmittance .7 7.5 Measurement of remaining scattering. 7 7.6 Measurement of scattering with specimen 7 7.7 Calculationoftheforwardscatteringofthespecimen .8 7.8 Calculation of the mean forward scattering of the specimen 9 7.9 Uncertainty budget. .9 8 Test report .9 Annex A (informative) Measurement examples of the specimen transmittance, remaining scattering and scattering with a specimen. ..11 Annex B (normative) Performance certification of a double-beam spectrophotometer ..13 Annex C (informative) Influence of minimum scattering collection angle to measured forward scattering. ..14 AnnexD (informative)Derivationoftheformula offorward scattering ..17 Bibliography ..20 @ IS0 2019 - All rights reserved ii