ISO INTERNATIONAL STANDARD 14490-8 First edition 2011-09-15 Optics andoptical instrumentsTest methodsfortelescopicsystems- Part 8: Test methods for night-vision devices Optiqueet instrumentsd'optique-Methodesd'essaipoursystemes teléscopiques Partie 8: Methodes d'essai pour dispositifs de vision de nuit Reference number ISO 14490-8:2011(E) TSO @ISO2011 ISO 14490-8:2011(E) COPYRIGHTPROTECTEDDOCUMENT ? ISO 2011 All rights reserved. any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from either IsO at the address below or IsO's member body in the country of the requester. ISO copyright office Case postale 56 · CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail [email protected] Web www.iso.org Published in Switzerland ii @ ISO 2011 All rights reserved ISO14490-8:2011(E) Contents Page Foreword 1 Scope 2 Normativereferences 3 Generalrequirementsforthetestconditionsandpreparationoftests. 1 4 Testmethodformeasuringmagnificationanddifferenceinmagnification 2 4.1 General 2 4.2 Requirements for the test arrangements and theirprincipal parts 4.3 Sequence of measurements.. .5 4.4 Assessmentofresults 5 Test method for measuring night-vision devicegain 5.1 General 6 5.2 Requirements for thetest arrangement and principal parts 5.3 Sequence of measurements... 5.4 Assessmentofresults.. 6 Test method for measuring the angularfield ofview in object space 6.1 General 6.2 Requirements forthetestarrangementand principalparts 6.3 Sequenceofmeasurements. 8 6.4 Assessmentofresults... 8 7 Test method for measuring exit pupil diameter and eye relief.. 7.1 General. 9 7.2 Requirements for the test arrangement and its principalparts ..9 7.3 Sequenceofmeasurements..... 10 8 Testmethodformeasuringthe errorofzero-positionof thedioptrescale 10 8.1 General 10 8.2 Requirements forthetest arrangementand its principal parts 10 8.3 Sequenceofmeasurements. 11 8.4 Assessmentofresults. 11 9 Test method formeasuring the angle of image rotation around the optical axis relative to the object and the difference of image rotationangles ... 12 9.1 General 12 9.2 Requirementsof thetestarrangementand itsprincipalparts 12 9.3 Sequence of measurements. 13 9.4 Assessment of results .... 10 Test method for measuring non-parallelism of the axes of bundles of rays emerging from the eyepieces of the night-vision device .. 13 10.1 General 13 10.2 Requirementsof thetestarrangementand itsprincipal parts 13 10.3 Sequence of measurements... 15 10.4 Assessmentofresults. 15 11 Test method for measuring the limit of resolution .. .15 11.1 General. 15 11.2 Requirements for thetest arrangementand itsprincipal parts 15 11.3 Sequenceofmeasurements. 16 11.4 Assessmentofresults. 12 Test method formeasuring working resolution and for determining ..16 range ofvision 12.1 General. 16 12.2 Requirements for the test arrangement and its principal parts 17 12.3 Sequence ofmeasurements... 17 @ ISO 2011 - All rights reserved ii ISO14490-8:2011(E) 12.4 Assessmentofresults 18 13 Testmethod formeasuring theclosedistance ofobservation 19 13.1 General .. 19 13.2 Requirementsforthetestarrangementand itsprincipal parts ..19 13.3 Sequenceofmeasurements... 20 13.4 Assessmentofresults. 20 14 Test methodforimperfections inthefield ofview 20 14.1 General .. 20 14.2 Requirementsforthetestarrangementand itsprincipalparts 20 14.3 Sequence of measurements... 21 14.4 Assessmentofresults. 22 15 Test method for measuring the continuous work time of a night-vision device. 22 15.1 22 15.2 Requirementsforthetestarrangementanditsprincipalparts 22 15.3 Sequenceofmeasurements.... 22 15.4 Assessmentofresults 2 Bibliography 23 iv @ ISO 2011 - All rights reserved ISO14490-8:2011(E) Foreword (Iso member bodies).The work of preparing International Standards is normally carried out throughIso technical committees. Each member body interested in a subject for which a technical committee has been non-governmental, in liaison with isO, also take part in the work. isO