1、BRITISH STANDARD BS EN 167:2002 Personal eye-protection Optical test methods The European Standard EN 167:2001 has the status of a British Standard ICS 13.340.20 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBS EN 167:2002 This British Standard, having been prepared under the
2、 direction of the Health and Environment Sector Policy and Strategy Committee, was published under the authority of the Standards Policy and Strategy Committee on 28 January 2002 BSI 28 January 2002 ISBN 0 580 38915 4 National foreword This British Standard is the official English language version o
3、f EN 167:2001. It supersedes BS EN 167:1995 which is withdrawn. The UK participation in its preparation was entrusted by Technical Committee PH/2, Eye protection, to Subcommittee PH/2/2, Industrial eye protectors, which has the responsibility to: A list of organizations represented on this subcommit
4、tee can be obtained on request to its secretary. Cross-references The British Standards which implement international or European publications referred to in this document may be found in the BSI Standards Catalogue under the section entitled “International Standards Correspondence Index”, or by usi
5、ng the “Find” facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity
6、 from legal obligations. aid enquirers to understand the text; present to the responsible European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. Summar
7、y of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 27 and a back cover. The BSI copyright date displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. Date CommentsEUROPEANSTANDARD NORMEE
8、UROPENNE EUROPISCHENORM EN167 November2001 ICS13.340.20 SupersedesEN167:1995 Englishversion PersonaleyeprotectionOpticaltestmethods ProtectionindividuelledeloeilMthodesdessais optiques PersnlicherAugenschutzOptischePrfverfahren ThisEuropeanStandardwasapprovedbyCENon3September2001. CENmembersarebound
9、tocomplywiththeCEN/CENELECInternalRegulationswhichstipulatetheconditionsforgivingthisEurope an Standardthestatusofanationalstandardwithoutanyalteration.Uptodatelistsandbibliographicalreferencesconcernings uchnational standardsmaybeobtainedonapplicationtotheManagementCentreortoanyCENmember. ThisEurop
10、eanStandardexistsinthreeofficialversions(English,French,German).Aversioninanyotherlanguagemadebytra nslation undertheresponsibilityofaCENmemberintoitsownlanguageandnotifiedtotheManagementCentrehasthesamestatusasthe official versions. CENmembersarethenationalstandardsbodiesofAustria,Belgium,CzechRepu
11、blic,Denmark,Finland,France,Germany,Greece, Iceland,Ireland,Italy,Luxembourg,Netherlands,Norway,Portugal,Spain,Sweden,SwitzerlandandUnitedKingdom. EUROPEANCOMMITTEEFORSTANDARDIZATION COMITEUROPENDENORMALISATION EUROPISCHESKOMITEEFRNORMUNG ManagementCentre:ruedeStassart,36B1050Brussels 2001CEN Allrig
12、htsofexploitationinanyformandbyanymeansreserved worldwideforCENnationalMembers. Ref.No.EN167:2001EEN167:2001(E) 2 Contents page Foreword3 1 Scope 4 2 Normativereferences 4 3 Testforspherical,astigmaticandprismaticrefractivepowers 4 3.1 Testingunmountedocularscoveringoneeye .4 3.2 Testingunmountedocu
13、larscoveringbotheyesandmountedoculars(spectacles,goggles andfaceshields) 6 4 Lightdiffusiontest .8 4.1 Principle8 4.2 Testmethods 8 5 Assessmentofqualityofmaterialandsurface . .14 6 Determinationoftransmittance 14 7 Determinationofvariationsinluminoustransmittance . .15 7.1 Unmountedocularscoveringo
14、neeye .15 7.2 Mountedocularsandunmountedocularscoveringbotheyes 16 7.3 Methodtocorrecttransmittanceforvariationsinthicknessoftheocular .17 8 Determinationofspectralreflectanceininfrared. 18 AnnexA (normative) Methodformeasuringsphericalandastigmaticrefractivepowersoversmall areas19 A.1 Principle19 A
15、.2 Apparatus .19 A.3 Measurements20 AnnexB (informative) Uncertaintyofmeasurementandresultsinterpretation.25 B.1 Testreportanduncertaintyofmeasurement .25 AnnexZA (informative) ClausesofthisEuropeanStandardaddressingessentialrequirementsorother provisionsofEUDirectives 27EN167:2001(E) 3 Foreword Thi
16、sdocumenthasbeenpreparedbyTechnicalCommitteeCEN /TC 85,“Eyeprotectiveequipment“,the secretariatofwhichisheldbyAFNOR. ThisEuropeanStandardshallbegiventhestatusofanationalstandard,eitherbypublicationofanidenticaltextor byendorsement,atthelatestbyMay2002,andconflictingnationalstandardsshallbewithdrawna
17、tthelatestby May2002 . ThisEuropeanStandardreplacesEN167:1995. ThisdocumenthasbeenpreparedunderamandategiventoCENbytheEuropeanCommissionandtheEuropean FreeTradeAssociation,andsupportsessentialrequirementsofEUDirective(s). ForrelationshipwithEUDirective(s),seeinformativeannexZA,whichisanintegralparto
18、fthisdocument. AnnexAisnormative.TheannexesBandZAareinformative. AccordingtotheCEN/CENELECInternalRegulations,thenationalstandardsorganizationsofthefollowing countriesareboundtoimplementthisEuropeanStandard:Austria,Belgium,CzechRepublic,Denmark,Finland, France,Germany,Greece,Iceland,Ireland,Italy,Lu
19、xembourg,Netherlands,Norway,Portugal,Spain,Sweden, SwitzerlandandtheUnitedKingdom.EN167:2001(E) 4 1Scope ThisEuropeanStandardspecifiesopticaltestmethodsforeyeprotectors,therequirementsforwhicharecontained inotherENs. Alternativemethodsmaybeusedifshowntobeequivalent. NonopticaltestmethodsaregiveninEN
20、168. SpecificationsaregiveninEN166. AdefinitionoftermsisgiveninEN165. 2 Normativereferences ThisEuropeanStandardincorporatesbydatedorundatedreference,provisionsfromotherpublications.These normativereferencesarecitedattheappropriateplacesinthetext,andthepublicationsarelistedhereafter.For datedreferen
21、ces,subsequentamendmentstoorrevisionsofanyofthesepublicationsapplytothisEuropean Standardonlywhenincorporatedinitbyamendmentorrevision.Forundatedreferencesthelatesteditionofthe publicationreferredtoapplies(includingamendments). EN165, PersonaleyeprotectionVocabulary . EN166, PersonaleyeprotectionSpe
22、cifications. EN168, PersonaleyeprotectionNonopticaltestmethods. 3 Testforspherical,astigmaticandprismaticrefractivepowers NOTE Thereferencemethodsforassessmentofrefractivepowerarecontainedin3.1and3.2. Ifduringmeasurementusingthetelescopeadoublingorotheraberrationoftheimageisobservedthentheocular may
23、eitherbeclassifiedasadefective,orsubjectedtofurtherexaminationusingthemethoddescribedinannexA. 3.1 Testingunmountedocularscoveringoneeye 3.1.1Apparatus 3.1.1.1Telescope Atelescopewithanapertureofnominally20mmandamagnificationbetween10and30,fittedwithanadjustable eyepieceincorporatingareticule. 3.1.1
24、.2Illuminated target Atarget,consistingofablackplateincorporatingthecutoutpatternshowninFigure1,behindwhichislocateda lightsourceofadjustableluminancewithacondenser,ifnecessary,tofocusthemagnifiedimageofthelight sourceonthetelescopeobjective. Thelargeannulusofthetargethasanouterdiameterof(23,0 0,1)
25、mmwithanannularapertureof (0,6 0,1) mm.Thesmallannulushasaninnerdiameterof(11,0 0,1) mmwithanannularapertureof (0,60,1)mm.Thecentralaperturehasadiameterof(0,60,1)mm.Thebarsarenominally20mmlongand 2mmwidewithanominal2mmseparation.EN167:2001(E) 5 3.1.1.3Filter Afilterwithitsmaximumtransmittanceinthegr
26、eenpartofthespectrummaybeusedtoreducechromatic aberrations. 3.1.1.4 Calibrationlenses Lenseswithpositiveandnegativesphericalrefractivepowersof 0,06 m 1 , 0,12m 1 and0,25 m 1 (tolerance0,01m 1 ). 3.1.2 Arrangementandcalibrationofapparatus Thetelescopeandilluminatedtargetareplacedonthesameopticalaxis(
27、4,600,02)mapart. Theobserverfocusesthereticuleandthetargetandalignsthetelescopetoobtainaclearimageofthepattern. Thissettingisregardedasthezeropointofthefocusingscaleofthetelescope.Thetelescopeshallbealignedso thatthecentralapertureofthetargetisimagedonthecentreofthecrosslinegraticule.Thissettingisre
28、gardedas thezeropointoftheprismscale. Thefocusingadjustmentofthetelescopeiscalibratedwiththecalibrationlenses(3.1.1.4)sothatapower of0,01m 1 maybemeasured.Anyotherequivalentcalibrationmethodmaybeused. 3.1.3Procedure Positiontheocularinfrontofthetelescopeintheaswornposition,orotherpositionasspecified
29、bythe manufacturer.Iftheaswornpositionisunknown,orifnopositionisspecifiedbythemanufacturerthentheocular shallbepositionednormaltothetelescopicaxisandthetestsconductedatthegeometriccentre. 3.1.3.1 Sphericalrefractivepowerandastigmaticrefractivepower 3.1.3.1.1 Ocularswithoutastigmaticrefractivepower T
30、hetelescopeisadjusteduntiltheimageofthetargetisclearlyfocussed.Thesphericalpoweroftheocularisthen readfromthescaleofthetelescope. 3.1.3.1.2 Ocularswithastigmaticrefractivepower Thetarget,ortheocular,isrotatedinordertoaligntheprincipalmeridiansoftheocularwiththebarsofthetarget. Thetelescopeisfocusedf
31、irstlyononesetofbars(measurement D 1 )andthenontheperpendicularbars (measurementD 2 ).Thesphericalpoweristhemean, 2 2 1 D D theastigmaticrefractivepoweristheabsolute difference, 2 1 D D ,ofthetwomeasurements. NOTE Duringthisprocessthebestfocusshallbeusedacrossthewholetargetforeachmeridian. 3.1.3.2 P
32、rismaticrefractivepower Theoculartobetestedisplacedinfrontofthetelescope,and,ifthepointofintersectionofthelinesofthereticule fallsoutsidetheimageofthelargecircle,theprismaticpowerexceeds0,25cm/m.Ifthepointofintersectionofthe linesofthereticulefallsinsidetheimageofthesmallcircleofthetarget,theprismat
33、icpowerisless than0,12cm/m.EN167:2001(E) 6 Figure1Telescopetarget(dimensionsaregivenin3.1.1.2) 3.2 Testingunmountedocularscoveringbotheyesandmountedoculars(spectacles,goggles andfaceshields) 3.2.1 Determinationofthesphericalandastigmaticrefractivepower Positiontheocularsuchthatitisinan“asworn”orient
34、ationinfrontofthetelescope. Measurementsofsphericalandastigmaticpowersshallbetakenbasedonthevisualcentreoftheocularusingthe proceduresspecifiedin3.1.3.1. 3.2.2 Determinationofthedifferenceinprismaticrefractivepower 3.2.2.1Apparatus ThearrangementofthereferencemethodisshowninFigure2. 3.2.2.2Procedure
35、 ThediaphragmLB 1 ,illuminatedbythelightsource,isadjustedinsuchawaythatitproducesanimageonthe planeBwhentheeyeprotector(P)isnotinposition.TheeyeprotectorisplacedinfrontofthelensL 2 intheas wornpositionsothattheaxisoftheeyeprotectorisparalleltotheopticalaxisofthetestassembly.Adjustabletilt eyeprotect
36、orsarepositionedwiththeirocularsnormaltotheopticalaxisofthetestequipment. Measuretheverticalandhorizontaldistancesbetweenthetwodisplacedimagesarisingfromthetwoocular regionsoftheeyeprotector. Thesedistancesincentimetresaredividedbytwotogivethehorizontalandverticalprismaticdifferences incentimetrespe
37、rmetre. Ifthelightpathswhichcorrespondtothetwoeyeregionscross,theprismaticrefractivepowerisbaseinandifthe lightpathsdonotcross,itisbaseout.EN167:2001(E) 7 Dimensionsinmillimetres(nominalunlesstoleranced) Key La Lightsource,forexample,smallfilamentlamp,laserwithwavelengthof(600 70)nm,etc. J Interfere
38、ncefilterwithpeaktransmittanceinthegreenpartofthespectrum(requiredonlyifafilamentlampisusedas thelightsource) L1 Achromaticlens,focallengthbetween20mmand50mm LB1 Diaphragm,diameterofaperture1mmnominal P Eyeprotector LB2 DiaphragmasshownindetailA L2 Achromaticlens,1000mmnominalfocallengthand75mmnomin
39、aldiameter B Imageplane a Ascloseaspossible. b X=(32,0 0,2)mmor(27,0 0,2)mmdependingonthesizeoftheheadformspecifiedinEN168. Figure2ArrangementofapparatusformeasurementofprismaticdifferenceEN167:2001(E) 8 4 Lightdiffusiontest 4.1Principle Theluminance( L s )ofanilluminatedocularisameasureofitslightdi
40、ffusionandisproportionaltotheilluminance (E).Theproportionalityfactoristheluminancefactor l= L s /E,whichisexpressedincandelaspersquaremetreper lux lx ) m / cd ( 2 . Toobtainafactor l*whichisindependentofthetransmittanceoftheocular,theluminancefactorisdividedbythe transmittance . E L l s * Thisquant
41、ityisknownasthereducedluminancefactorandisexpressedinthesameunitsastheluminancefactor. NOTE Mostocularshavediffusionpropertieswhicharesymmetricalabouttheopticalaxis.Fortheseoculars,themean valueofthereducedluminancefactorismeasuredwithinananglelimitedbythetwoconesshowninFigure3.Thismeanvalue depends
42、uponvalues and . Key 1 Incidentlightonopticalaxis 2 Diffusedlight 3O c u l a r Figure3Diffusionangles 4.2Test methods Twotestmethodsarespecifiedwhichusethesamemeasurementprinciple.Thebasicmethoddetailedin4.2.1 maybeusedforocularswithoutcorrectiveeffectandforallshadenumbers.Thesimplifiedmethoddetaile
43、d in4.2.2hastobeusedforocularswithcorrectiveeffect. Theresultsobtainedwiththetwomethodsmaybeconsideredtobeequivalent;whichevermethodisusedthe relativemeasurementuncertaintyforthereducedluminancefactorshallnotbegreaterthan25%. Measurementsoflightdiffusionshallbetakenatthevisualcentreoftheocular.Ifthevisualcentreisnotknown thenthegeometriccentreshallbeused. NOTE VisualcentreisasdefinedinEN166.EN167:2001(E) 9 4.2.1Basic method 4.2.1.1Apparatus ThearrangementisshowninFigure4. ThesphericalconcavemirrorH 1
