ISO INTERNATIONAL STANDARD 18251-1 First edition 2017-02 Non-destructive testing Infrared thermography - Part 1: Characteristics of system and equipment Essais non destructifs - Thermographie infrarouge - Partie 1: Caractéristiques du systeme et des équipements Reference number ISO 18251-1:2017(E) [so International Organization for Standardization ZHEJIANG INST OF STANDARDIZATION C1 5956617 @ IS0 2017 ed without license from IHS IS0 18251-1:2017(E) COPYRIGHTPROTECTEDDOCUMENT IS0 2017, Published in Switzerland 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 the requester. ISO copyrightoffice 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 Internatinair PrganizationforStandardization icensee-ZHEJIANG INSTOF STANDARDIZAoISQ07 -All rights reserved etworking permitted without license from IHS IS0 18251-1:2017(E) Contents Page Foreword ..V Introduction. ...vi 1 Scope 2 Normative references 3 Terms and definitions 4 IR system setup .1 5 Objective lens .2 5.1 General .2 5.2 Spectral response. .2 5.3 Focal length (mm) .2 5.4 Aperture f-number 5.5 Interchangeable object lenses .3 6 Detector .3 6.1 .3 General 6.2 Detector types. 3 6.3 Detectorarrays .3 6.4 Scanning systems 3 6.5 Working wavelength range .3 6.6 Number of pixels 4 6.7 Bad/dead pixel .4 6.8 Detector operability ..4 6.9 Thermal time constant ..4 6.10 Integration time. 6.11 Temperature range. .4 7 Image processor. ..4 7.1 General ..4 7.2 Image acquisition. 4 7.2.1 Timing acquisition ..4 7.2.2 Trigger acquisition. .5 7.2.3 Image freeze. .5 7.3 Image display .5 7.4 Image analysis .5 7.5 Image processing 5 7.5.1 General.. 5 7.5.2 Bad/dead pixel replacement ..5 7.5.3 Non-uniformity correction. .5 7.5.4 Image enhancement. 7.5.5 Filtering 6 7.5.6 Time correlated processing method .6 7.5.7 Visible-infrared image fusion. .6 7.6 Image recording. .6 8 Thermal stimulation source .6 8.1 General. .6 8.2 Optical radiation devices .6 8.3 Convective excitation devices. .6 8.4 Electromagnetic induction devices ..7 8.5 Mechanical excitation devices. 8.6 Advantages and drawbacks of thermal stimulation sources. .7 9 Integrated characteristics and functions of infrared systems and equipment ..7 9.1 Integrated performanceparameters... 1 9.1.1 Noise equivalent temperature difference (NETD) 7 iii jicensee=ZHEJIANG INST OF STANDARDIZATION C1 5956617 vithoutlicense from IHS Not for Resale, 2017/3/28 02:49:48