1、BRITISH STANDARD AEROSPACE SERIESBS EN3745-202:2005Fibres and cables, optical, aircraft use Test methods Part 202: Fibre dimensionsThe European Standard EN 3745-202:2005 has the status of a British StandardICS 49.060g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g
2、54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58BS EN 3745-202:2005This British Standard was published under the authority of the Standards Policy and Strategy Committee on 30 June 2006 BSI 2006ISBN 0 580 48642 7National forewordThi
3、s British Standard is the official English language version of EN 3745-202:2005. 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, which
4、 has the responsibility to: A list of organizations represented on this subcommittee can be obtained on request to its secretary.Cross-referencesThe British Standards which implement international or European publications referred to in this document may be found in the BSI Catalogue under the secti
5、on entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Com
6、pliance 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 UK interests informed; monitor related i
7、nternational and European developments and promulgate them in the UK.Summary of pagesThis document comprises a front cover, an inside front cover, the EN title page, pages 2 to 5 and a back cover.The BSI copyright notice displayed in this document indicates when the document was last issued.Amendmen
8、ts issued since publicationAmd. No. Date CommentsEUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN 3745-202November 2005ICS 49.060English VersionAerospace series - Fibres and cables, optical, aircraft use - Testmethods - Part 202: Fibre dimensionsSrie arospatiale - Fibres et cbles optiques usagearon
9、autique - Mthodes dessais - Partie 202 :Dimensions de la fibreLuft- und Raumfahrt - Faseroptische Leitungen frLuftfahrzeuge - Prfverfahren - Teil 202: Faserabmessun-genThis European Standard was approved by CEN on 19 September 2005.CEN members are bound to comply with the CEN/CENELEC Internal Regula
10、tions which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the Central Secretariat or to any CEN member.This Europe
11、an Standard exists in three official versions (English, French, German). A version in any other language made by translationunder the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the officialversions.CEN members are the national
12、standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia,Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN CO
13、MMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGManagement Centre: rue de Stassart, 36 B-1050 Brussels 2005 CEN All rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 3745-202:2005: E2 Contents Page Forewo
14、rd 3 1 Scope .4 2 Normative references .4 3 Preparation of specimens 4 4 Apparatus 4 5 Method .5 EN 3745-202:20053 Foreword This European Standard (EN 3745-202:2005) has been prepared by the European Association of Aerospace Manufacturers - Standardization (AECMA-STAN). After enquiries and votes car
15、ried out in accordance with the rules of this Association, this Standard has re-ceived the approval of the National Associations and the Official Services of the member countries of AECMA, prior to its presentation to CEN. This European Standard shall be given the status of a national standard, eith
16、er by publication of an identical text or by endorsement, at the latest by May 2006, and conflicting national standards shall be withdrawn at the latest by May 2006. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN and/or CENEL
17、EC shall not be held responsible for identifying any or all such patent rights. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Cyprus, Czech Republic, Den-mark, Estoni
18、a, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxem-bourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. EN 3745-202:20054 1 Scope This standard specifies several methods for measuring
19、the diameter of an optical fibre or cable, the non-circularity and the concentricity of the fibre core/cladding on an optical fibre. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated refer-ences, only the edition cited applies
20、. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 2591-100, Aerospace series Elements of electrical and optical connection Test methods Part 100: General EN 3745-100, Aerospace series Fibres and cables, optical, aircraft use Test methods P
21、art 100: General1)EN 188000, General specification for optical fibres 3 Preparation of specimens 3.1 The specimen shall comprise a length of the optical fibre or cable to be measured. The fibre ends shall be prepared in accordance with EN 2591-100. The length of specimen shall be (3 0,5) m unless ot
22、herwise specified in the product standard. lf not yet at standard test conditions, the specimens shall be subjected to standard test conditions and stabi-lized at these conditions for 24 h as defined in EN 3745-100. 3.2 The following detail shall be specified if not already included in the product s
23、tandard: type of fibre/cable from which the specimen was taken. 4 Apparatus The apparatus shall be as defined in the selected test method in EN 188000. For method B, the Light Launch System used shall be as specified in EN 2591-100 with an angular size 110 % of the fibre numerical aperture and a spo
24、t size 110 % of fibre core diameter. 1) In preparation at the date of publication of this standard. EN 3745-202:20055 5 Method 5.1 Method A: Refracted near field The test method shall conform to EN 188000 method 101. This test may be used to measure the following characteristics of the fibre: diamet
25、er of core; diameter of cladding; non circularities; concentricity errors. 5.2 Method B: Near field light distribution The test method shall conform to EN 188000 method 102. This test may be used to measure the following characteristics of the fibre: diameter of core; diameter of cladding; non circu
26、larities; concentricity errors. 5.3 Method C: Four concentric circles The test method shall conform to EN 188000 method 103. This test may be used to measure the following characteristics of the fibre: non circularities; concentricity errors. 5.4 Method D: Mechanical diameter measurement The test me
27、thod shall conform to EN 188000 method 104. This test may be used to measure the following characteristics of the fibre: diameter of cladding; diameter of coatings; diameter of jacket; non circularities. EN 3745-202:2005BS EN 3745-202:2005BSI389 Chiswick High RoadLondonW4 4ALBSI British Standards In
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