BS EN 3745-305-2002 Aerospace series - Fibres and cables optical aircraft use - Test methods - Immunity to ambient light coupling《航空航天系列 飞行器用光纤和光缆 试验方法 周围光耦合的消除》.pdf

1、BRITISH STANDARD AEROSPACE SERIES BS EN 3745-305:2002 Fibres and cables, optical, aircraft use Test methods Part 305: Immunity to ambient light coupling The European Standard EN 3745-305:2002 has the status of a British Standard ICS 49.060 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COP

2、YRIGHT LAWBS EN 3745-305:2002 This British Standard, having been prepared under the direction of the Engineering Sector Policy and Strategy Committee, was published under the authority of the Standards Policy and Strategy Committee on 25 June 2002 BSI 25 June 2002 ISBN 0 580 39903 6 National forewor

3、d This British Standard is the official English language version of EN 3745-305:2002. The UK participation in its preparation was entrusted by Technical Committee ACE/6, Aerospace avionic electrical and fibre optic technology, to Subcommittee ACE/6/10, Aerospace fibre optic systems and equipment, wh

4、ich has the responsibility to: A list of organizations represented on this subcommittee 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

5、under the section entitled “International Standards Correspondence Index”, or by using 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 correc

6、t application. Compliance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests infor

7、med; monitor related international and European developments and promulgate them in the UK. Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 5, and a back cover. The BSI copyright date displayed in this document indicates when the document

8、was last issued. Amendments issued since publication Amd. No. Date CommentsEUROPEANSTANDARD NORMEEUROPENNE EUROPISCHENORM EN3745305 June2002 ICS49.060 Englishversion AerospaceseriesFibresandcables,optical,aircraftuseTest methodsPart305:Immunitytoambientlightcoupling SriearospatialeFibresetcblesoptiq

9、uesusage aronautiqueMthodesdessaisPartie305:Immunit decouplagelalumireambiante LuftundRaumfahrtFaseroptischeLeitungenfr LuftfahrzeugePrfverfahrenTeil305: Fremdlichteinkopplung ThisEuropeanStandardwasapprovedbyCENon1March2002. CENmembersareboundtocomplywiththeCEN/CENELECInternalRegulationswhichstipul

10、atetheconditionsforgivingthisEurope an Standardthestatusofanationalstandardwithoutanyalteration.Uptodatelistsandbibliographicalreferencesconcernings uchnational standardsmaybeobtainedonapplicationtotheManagementCentreortoanyCENmember. ThisEuropeanStandardexistsinthreeofficialversions(English,French,

11、German).Aversioninanyotherlanguagemadebytra nslation undertheresponsibilityofaCENmemberintoitsownlanguageandnotifiedtotheManagementCentrehasthesamestatusasthe official versions. CENmembersarethenationalstandardsbodiesofAustria,Belgium,CzechRepublic,Denmark,Finland,France,Germany,Greece, Iceland,Irel

12、and,Italy,Luxembourg,Malta,Netherlands,Norway,Portugal,Spain,Sweden,SwitzerlandandUnitedKingdom. EUROPEANCOMMITTEEFORSTANDARDIZATION COMITEUROPENDENORMALISATION EUROPISCHESKOMITEEFRNORMUNG ManagementCentre:ruedeStassart,36B1050Brussels 2002CEN Allrightsofexploitationinanyformandbyanymeansreserved wo

13、rldwideforCENnationalMembers. Ref.No.EN3745305:2002EEN3745305:2002(E) 2 Foreword Thisdocument(EN3745305:2002)hasbeenpreparedbytheEuropeanAssociationofAerospace Manufacturers(AECMA). AfterenquiriesandvotescarriedoutinaccordancewiththerulesofthisAssociation,thisStandardhas receivedtheapprovaloftheNati

14、onalAssociationsandtheOfficialServicesofthemembercountriesof AECMA,priortoitspresentationtoCEN. ThisEuropeanStandardshallbegiventhestatusofanationalstandard,eitherbypublicationofanidentical textorbyendorsement,atthelatestbyDecember2002,andconflictingnationalstandardsshallbe withdrawnatthelatestbyDec

15、ember2002. AccordingtotheCEN/CENELECInternalRegulations,thenationalstandardsorganizationsofthefollowing countriesareboundtoimplementthisEuropeanStandard:Austria,Belgium,CzechRepublic,Denmark, Finland,France,Germany,Greece,Iceland,Ireland,Italy,Luxembourg,Malta,Netherlands,Norway, Portugal,Spain,Swed

16、en,SwitzerlandandtheUnitedKingdom.EN3745305:2002(E) 3 1 Scope Thisstandardspecifiesamethodofmeasuringtheimmunityofopticalfibreorcabletothecouplingofpower comingfromanexternallightsource. 2 Normativesreferences ThisEuropeanStandardincorporatesbydatedorundatedreferenceprovisionsfromotherpublications.

17、Thesenormativereferencesarecitedattheappropriateplacesinthetextandthepublicationsarelisted hereafter.Fordatedreferences,subsequentamendmentstoorrevisionsofanyofthesepublicationsapplyto thisEuropeanStandardonlywhenincorporatedinitbyamendmentorrevision.Forundatedreferencesthe latesteditionofthepublica

18、tionreferredtoapplies. EN 3745100 AerospaceseriesFibresandcables,optical,aircraftuseTestmethods Part100:General 1) 3 Preparationofspecimens 3.1 Thespecimensshallbepreparedaccordingtotheproductstandard. Ifnotyetatstandardtestconditions,thespecimensshallbesubjectedtostandardtestconditionsand stabilize

19、dattheseconditionsfor24hasdefinedinEN3745100. 3.2 Unlessspecifiedinthetechnicalspecification,thefollowingdetailsshallbestated: typeandlengthofthespecimeninthelightproofelement; spectralcharacteristicsorcolortemperatureofthelightsource; minimumauthorizedlongtermbendradius; typeofapparatususedtoguaran

20、teetheminimumlongtermbendradius. 4 Apparatus Theapparatusshallcomprise: C amodulatorsettofrequencywhichisnotamultipleof50Hzor60Hz; D adetector; Di adiffuser; IS anintegrationsphere; LA alockingamplifiertoachievethedetectionmeasurement; LDS aLightDetectorSysteminaccordancewiththespectralcharacteristi

21、csofthelightsource; Le alens; LS aLightSource; T aterminatortoprovideanonreflectivetermination; aremovablelightproofelementallowingshieldingthespecimenfromthelight; aglasscylinderoralternativeapparatuswhosediameterisinaccordancewiththeminimum longtermbendradius; 1) Inpreparationatthedateofpublicatio

22、nofthisstandardEN3745305:2002(E) 4 Atypicalarrangementisshowninfigure1. Figure1 5 Method Themethodconsistsofmeasuringtheambientlightcoupledinthespecimenbytheuseofanintegrated sphere(seefigure1). 5.1 Procedure Installthespecimenoflength L,retainedatspecifiedbendradius,inthelightproofelement. Turnonth

23、eLS,C,D,LDSandLA. Insertthespecimenwiththeremovablelightproofelementintheintegratedsphere. AdjustthepowerofLSsothattheoutputpowerisclosetotheupperdetectionlimitsofDandthenmeasure theoutputpowers P 0 and P f . Removethelightproofelement. Ifnecessary,adjustthepowerofLSagainsothatnew Pvalue P 1 isequal

24、to P 0 . Measurethenewpower P c .EN3745305:2002(E) 5 P 0 = levelofopticalpowerlaunchedintotheintegrationsphereafterinsertionoftheremovablelight proofelementwiththespecimen P 1 = levelofopticalpowerlaunchedintotheintegrationsphereafterthelightproofelementhasbeen removed P f = ambientlightcoupledinthe

25、specimenintheremovablelightproofelement P c = ambientlightcoupledinthespecimenoncethelightproofelementhasbeenremoved 5.2 Finalmeasurementsandrequirements Calculatetheexternallightcouplingcoefficientperunitlengthwiththehelpofthefollowingequation: Couplingcoefficient(dB/m) = 0 f c log 10 P P P L - - N

26、OTE Thiscalculationassumesthatvalues P0and P1areequal.BS EN 3745-305:2002 BSI 389 Chiswick High Road London W4 4AL BSI British Standards Institution BSI is the independent national body responsible for preparing British Standards. It presents the UK view on standards in Europe and at the internation

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