1、BSISO19741:2025OpticsandphotonicsOpticalmaterialsandcomponentsTestmethodforstriaeininfraredopticalmaterialsbsiNationalforewordThisBritishStandardistheUKimplementationofISO19741:2025.ItsupersedesBSISO19741:2018,whichiswithdrawn.TheUKparticipationinitspreparationwasentrustedtoTechnicalCommitteeCPW/172
2、OpticsandPhotonics.Alistoforganizationsrepresentedonthiscommitteecanbeobtainedonrequesttoitscommitteemanager.ContractualandlegalconsiderationsThispublicationhasbeenpreparedingoodfaith,howevernorepresentation,warranty,assuranceorundertaking(expressorimplied)isorwillbemade,andnoresponsibilityorliabil
3、ityisorwillbeacceptedbyBSIinrelationtotheadequacy,accuracy,completenessorreasonablenessofthispublication.Allandanysuchresponsibilityandliabilityisexpresslydisclaimedtothefullextentpermittedbythelaw.Thispublicationisprovidedasis,andistobeusedattherecipientsownrisk.Therecipientisadvisedtoconsiderseeki
4、ngprofessionalguidancewithrespecttoitsuseofthispublication.Thispublicationisnotintendedtoconstituteacontract.Usersareresponsibleforitscorrectapplication.TheBritishStandardsInstitution2025PublishedbyBSIStandardsLimited2025ISBN9780539324112ICS37.020CompliancewithaBritishStandardcannotconferimmunityfro
5、mlegalobligations.ThisBritishStandardwaspublishedundertheauthorityoftheStandardsPolicyandStrategyCommitteeon31May2025.Amendments/corrigendaissuedsincepublicationDateTextaffectedISOInternationalStandardISO19741Secondedition2025-05OpticsandphotonicsOpticalmaterialsandcomponentsTestmethodforstriaeininf
6、raredopticalmaterialsOptiqueetphotoniqueMateriauxetComposantsoptiquesMethodesdessaipourdeterminerlesstriesdesmatehauxoptiquesinfrarougesReferencenumberISO19741:2025(en)COPYRIGHTPROTECTEDDOCUMENTISO2025Allrightsreserved.Unlessotherwisespecified,orrequiredinthecontextofitsimplementation,nopartofthispu
7、blicationmaybereproducedorutilizedotherwiseinanyformorbyanymeans,electronicormechanical,includingphotocopying,orpostingontheinternetoranintranet,withoutpriorwrittenpermission.PermissioncanberequestedfromeitherISOattheaddressbeloworISO,smemberbodyinthecountryoftherequester.ISOcopyrightofficeCP401Ch.d
8、eBlandonnet8CH-1214Vernier,GenevaPhone:+41227490111Email:copyrightiso.orgWebsite:www.iso.orgPublishedinSwitzerlandContentsPageForewordiv1 Scope12 Normativereferences13 Termsanddefinitions14 Principle15 Apparatus25.1 Apparatusarrangement25.2 Collimatinginfraredlightsourcesystem25.3 Projectionopticals
9、ystem25.4 Knifeedgedevice35.5 Imagesensor35.6 Computerimagecollecting,processinganddisplayingsystem35.7 Standardgreylevelsample36 Testconditions36.1 Environmentaltemperature36.2 Relativeairhumidity37 Sample37.1 Surfaceroughness37.2 Scratchesanddigsofsurface38 Procedure48.1 Projectionmeasurement48.2
10、Schlierenmeasurement49 Dataprocessing510 Testreport5AnnexA(informative)Testrecordforstriaeininfraredopticalmaterials6Bibliography7ForewordISO(theInternationalOrganizationforStandardization)isaworldwidefederationofnationalstandardsbodies(ISOmemberbodies).TheworkofpreparingInternationalStandardsisnorm
11、allycarriedoutthroughISOtechnicalcommittees.Eachmemberbodyinterestedinasubjectforwhichatechnicalcommitteehasbeenestablishedhastherighttoberepresentedonthatcommittee.Internationalorganizations,governmentalandnon-governmentabinliaisonwithISO,alsotakepartinthework.ISOcollaboratescloselywiththeInternati
12、onalElectrotechnicalCommission(IEC)onallmattersofelectrotechnicalstandardization.TheproceduresusedtodevelopthisdocumentandthoseintendedforitsfurthermaintenancearedescribedintheISO/IECDirectives,Part1.Inparticular,thedifferentapprovalcriterianeededforthedifferenttypesofISOdocumentshouldbenoted.Thisdo
13、cumentwasdraftedinaccordancewiththeeditorialrulesoftheISO/IECDirectives,Part2(seewww.iso.org/directives).ISOdrawsattentiontothepossibilitythattheimplementationofthisdocumentmayinvolvetheuseof（八）patent(三).ISOtakesnopositionconcerningtheevidence,validityorapplicabilityofanyclaimedpatentrightsinrespect
14、thereof.Asofthedateofpublicationofthisdocument,ISOhadnotreceivednoticeof（八）patent(三)whichmayberequiredtoimplementthisdocument.However,implementersarecautionedthatthismaynotrepresentthelatestinformation,whichmaybeobtainedfromthepatentdatabaseavailableatwww.iso.org/patents.ISOshallnotbeheldresponsible
15、foridentifyinganyorallsuchpatentrights.Anytradenameusedinthisdocumentisinformationgivenfortheconvenienceofusersanddoesnotconstituteanendorsement.Foranexplanationofthevoluntarynatureofstandards,themeaningofISOspecifictermsandexpressionsrelatedtoconformityassessment,aswellasinformationaboutISOsadheren
16、cetotheWorldTradeOrganization(WTo)principlesintheTechnicalBarrierstoTrade(TBT),seeWWW.isoQrgisoforeword.htmLThisdocumentwaspreparedbyTechnicalCommitteeISO/TC172,Opticsandphotonics,SubcommitteeSC3,Opticalmaterialsandcomponents.Thissecondeditioncancelsandreplacesthefirstedition(ISO19741:2018),whichhas
17、beentechnicallyrevised.Themainchangesareasfollows:一editorialchangesthroughoutthedocument.Anyfeedbackorquestionsonthisdocumentshouldbedirectedtotheusersnationalstandardsbody.AcompletelistingofthesebodiescanbefoundatWWW.isoQrgmembnrs.htmLOpticsandphotonicsOpticalmaterialsandcomponents一Testmethodforstr
18、iaeininfraredopticalmaterials1 ScopeThisdocumentspecifiestheprinciple,apparatus,condition,sample,procedureanddataprocessingofmeasuringstriaeininfraredopticalmaterials.Itisapplicableforthedeterminationofstriaeininfraredopticalmaterials,suchasinfraredopticalglass,whichisopaquetovisiblewavelengthsandwh
19、osetransmissionopticalspectraarebeyond0,78m.2 NormativereferencesThefollowingdocumentsarereferredtointhetextinsuchawaythatsomeoralloftheircontentconstitutesrequirementsofthisdocument.Fordatedreferences,onlytheeditioncitedapplies.Forundatedreferences,thelatesteditionofthereferenceddocument(includinga
20、nyamendments)applies.ISO10110-7,OpticsandphotonicsPreparationofdrawingsforopticalelementsandsystemsPart7:SurfaceimperfectionsISO10110-8,OpticsandphotonicsPreparationofdrawingsforopticalelementsandsystemsPart8:Surfacetexture3 TermsanddefinitionsForthepurposesofthisdocument,thefollowingtermsanddefinit
21、ionsapply.ISOandIECmaintainterminologydatabasesforuseinstandardizationatthefollowingaddresses:一ISOOnlinebrowsingplatform:availableathttps:/WWW.iso.org/obp一IECElectropedia:availableathttps:WWW.electropedia.org/3.1striaeininfraredopticalmaterialinternalimperfectionsofaninfraredmaterialappearingaswavyd
22、istortions,usuallyrepresentingalocalizedvariationinrefractiveindex3.2striaevalueaveragegreylevelofstriaemultiplyingthepercentageofstriaeareaperthicknessofinfraredopticalmaterials4 PrincipleTheprincipleofthistestistoilluminateasamplewithcollimatedinfraredradiationandimagethematerialinaSchlierenorproj
23、ectionimagingsystem.Thestriaewillbeimagedandmeasured,andthentheareaandtheproductofstriaeareapercentagetothemeangreylevelwillbecalculated.Whentheprojectionopticalsystemisadjustedtoabeam-contractingtelescopesystem,itisknownasaprojectionmeasurementsystem,andwhentheprojectionopticalsystemisadjustedtoaca
24、merasystemwhichutilizesaknifeedgedevice,itisknownasaSchlierenmeasurementsystem.TheschematicdiagramofstriaemeasurementininfraredopticalmaterialsisshowninFigure1.1lightsource82condenser93lightsourcediaphragm10lens2ofprojectionopticalsystemimagesensorcomputerimagecollecting,processinganddisplayingsyste
25、mprojectionopticalsystemsampleadjustmentstagecollimatedinfraredlightsourceKey4 infraredcollimatingoptics115 sample126 lens1ofprojectionopticalsystem137 knifeedgedeviceordiaphragmFigure1Schematicdiagramofthemeasurementforstriaeininfraredopticalmaterials5 Apparatus5.1 ApparatusarrangementTheapparatusc
26、onsistsofacollimatinginfraredlightsourcesystem,asampleadjustmentstage,aprojectionopticalsystem,animagesensor,andacomputerimagecollecting,processinganddisplayingsystem.5.2 CollimatinginfraredlightsourcesystemThecollimatedinfraredlightsourcesystemconsistsofalightsource,acondenser,alightsourcediaphragm
27、andaninfraredcollimatingoptics.Thediaphragmshallbeplacedatthefocusoftheinfraredcollimatingoptics.Theemissionspectrumofthesystemshallcoverorbewithinthetransmissionspectrumofthesample.Thenonuniformityoflightintensitydistributionshallnotbemorethan5%.Theradiationintensityofthelightsourceshallmeetthereq
28、uirementoftheresponseoftheimagesensor.Theemergentlightapertureofthesystemshouldbemorethanthediameterofthesample.5.3 ProjectionopticalsystemTheprojectionopticalsystemconsistsoflens1,lens2andaknifeedgedeviceordiaphragm.Theknifeedgedeviceordiaphragmshallbeplacedontherearfocalplaneoflens1.Thebeam-contra
29、ctingtelescopesystemwhichisusedfortheprojectionmeasurementconsistsoflens1andlens2fwiththerearfocalpointoftheformercoincidingwiththefrontfocalpointofthelatteralongthedirectionofanopticalaxis.ThecamerasystemwhichisusedfortheSchlierenmeasurementconsistsoflens1,lens2andaknifeedgedeviceoradiaphragmwhichi
30、splacedneartherearfocalpointoflens1.Thecamerasystemhasmovinglens2.5.4 KnifeedgedeviceThestraightnessofbladeofknifeedgedeviceshouldmeettherequirementsofcorrespondingstandards.Anditneedstobemovableandpreciselyadjustableontheverticaldirectiontotheblade.5.5 ImagesensorTheworkingspectrumofaninfraredimage
31、sensorshouldbewithinthetransmissionspectrumofthesamplemeasurement.Thespatialresolutioncorrespondingtotheimagesensorshouldbehigherthan0,25mm.5.6 Computerimagecollecting,processinganddisplayingsystem5.6.1 Thecomputerimagecollectingandprocessingsystemconsistsofacomputeranditsprocessingsoftware.Thecompu
32、terimagecollectingandprocessingsystemcollectsandprocessestheoutputsignalsoftheimagesensorandtransfersthemtothedisplayingsystem.5.6.2 Thedisplayingsystemconsistsofascreenandanelectronicruler.Thecontrastofthescreenshallbegreaterthan1000:1andtheresolutionshallbehigherthanthatoftheimagesensor.5.6.3 Thee
33、xpandeduncertaintyofmeasurementoftheelectronicrulershallbenotmorethan0,05mm.5.7 StandardgreylevelsampleThestandardgreylevelsampleshouldbemadeofaninfraredmaterialwhosetransmittanceis50%ofthemaximumgreylevelofstriae.Thetransmissionofstandardgreylevelsampleshallbeuniform.Thesamplewillbeusedtocalibratet
34、heimagesensor.6 Testconditions6.1 EnvironmentaltemperatureTheenvironmentaltemperatureshallbesteadilykeptatanytemperaturebetween15and35,withthetemperaturetolerancebeingnomorethan2.6.2 RelativeairhumidityTherelativeairhumidityshouldbelessthan80%.7 Sample7.1 SurfaceroughnessThesurfaceroughness,Rq,speci
35、fiedinISO10110-8ofthesampleshallbelessthan0,012m.7.2 ScratchesanddigsofsurfaceThescratchesanddigsspecifiedinISO10110-7onthesurfacesofthesampleshallbelessthan5/60,50;L60,008.8 Procedure8.1 Projectionmeasurement8.1.1 Turnonthepowersupplyandadjusttheintensityofthelightsourcetothenormaloperatingrangeoft
36、hemeasurementsystemandthenremainstablefor30min.8.1.2 Cleanthesurfacesofboththemeasurementsampleandthestandardgreylevelsampleseparately.8.1.3 Placethestandardgreylevelsampleonthesamplestageandthermallysoakthesamplewithinthemeasurementenvironmentforaperiodoftimethatallowsittoachieveathermalstability.8
37、1.4 Calibratetheimagesensorwiththestandardgreylevelsample.Afterthat,takeitoff.8.1.5 Placethesampleonthesamplestageandthermallysoakthesamplewithinthemeasurementenvironmentforaperiodoftimethatallowsittoachieveathermalstability.8.1.6 AlignthegeometriccentreofthesampleWiththecentreoftheviewfieldofthepr
38、ojectionopticalsystem.8.1.7 Adjustlens2oftheprojectionopticalsystemtomaketherearfocalpointoflens1coincidewiththefrontfocalpointoflens2alongthedirectionofanopticalaxissothattheprojectionopticalsystembecomesabeam-contractingtelescopesystemforaprojectingmeasurement.8.1.8 Observetheprojectingimageonthes
39、creenandrotatethesampleuntilthemaximalareaofthestriaeimageappearsonthescreen.8.1.9 Collecttheimagesofthestriaewiththeimagesensor.Usethesoftwareofthecomputerdatacollection,processing,anddisplayingsystemtoprocesstheimagedata.8.2 Schlierenmeasurement8.2.1 Turnontheilluminationandmeasurementequipmentand
40、adjusttheintensityofthelightsourcesuchthatitsirradiationpowermeetstherespondingrequirementsoftheimagesensor.Allowilluminationandmeasurementequipmenttoreachastablestate.8.2.2 Cleanthesurfacesofboththemeasurementsampleandthestandardgreylevelsampleseparately.8.2.3 Placethestandardgreylevelsampleonthesa
41、mplestageandthermallysoakthesamplewithinthemeasurementenvironmentforaperiodoftimethatallowsittoachieveathermalstability.8.2.4 Calibratetheimagesensorwiththestandardgreylevelsample.Afterthat,takeitoff.8.2.5 Placethemeasurementsampleonthesamplestageandthermallysoakthesamplewithinthemeasurementenvironm
42、entforaperiodoftimethatallowsittoachieveathermalstability.8.2.6 Alignthegeometriccentreofthesamplewiththecentreoftheviewfieldoftheimagingsystem.8.2.7 Placeaknifeedgedeviceneartherearfocalpointoflens1andmovelens2sothatacamerasystemforSchlierenmeasurementisestablished.Adjustlens2sothatthestriaeofthesa
43、mpleimagesclearlyontheimagesensor.8.2.8 Observethestriaeimageonthescreenandrotatethesampleuntilthemaximalareaofthestriaeimageappearsonthescreen.8.2.9 Collecttheimagesofthestriaewiththeimagesensor.Usethesoftwareofthecomputerdatacollection,processing,anddisplayingsystemtoprocesstheimagedata.9 Dataproc
44、essing9.1 Measureboththelengthandwidthofeveryregionofstriaeandcalculatetheareaofeachregionofstriaeaswellasthetotalareaofallregionsofstriaewiththesoftware.9.2 Calculatetheareapercentageofthestriaeregionstothemeasuredregionofthesamplewiththesoftware.9.3 Determinethegreylevelofeachstriaeregionwithanele
45、ctroniccriteriarulerofgreylevelsinthesoftware.Calculatetheaveragevalueofthegreylevelofthestriaewiththesoftwaretogaintheaverageopticalpathdifferenceofthesample.CalculatethePVvalueoftheopticalpathdifferenceofeachstriaeofthesample.9.4 Evaluatevisuallythetestresultsaccordingtorelatedclassificationstanda
46、rdsorbyreferringtothecorrespondingstandardinISOIOllOserieswiththeconsiderationofinfraredfeatures.Orcalculatethestriaevaluebyusingthesoftwaretomultiplytheaveragegreyvalueofthestriaeareabythepercentageofthestriaearea,andsubsequentlytodividetheresultbythesamplethickness.10 TestreportThetestreportshalli
47、ncludeatleastthefollowing(seeAnnexA):a) areferencetothisdocument,i.e.ISO19741:2025;b) laboratorynameandcontactinformation;c) testmethodandinstrument;d) testwavelength;e) client;f) samplename,cross-sectionalareaandthickness;g) environmentaltemperatureandhumidity;h) thelocation,shape,greylevel,length,
48、widthandareaofstriaelstriaeclassification,thestriaevalueofthesample;i) tester,reviewerandtestdate;j) remarks.AnnexAinformativeTestrecordforstriaeininfraredopticalmaterialsLaboratorynameContactinformationTestmethodTestinstrumentTestwavelength(m)ClientEnvironmentaltemperatureEnvironmentalhumiditySamplenameSamplecross-sectionalareaSamplethicknessStriaeregionsSerialnumberShapeAreaGreylevel
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