1、BS EN3745-100:2008ICS 49.060NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBRITISH STANDARDAerospace series Fibres and cables,optical, aircraft use Test methodsPart 100: GeneralThis British Standardwas published under theauthority of the StandardsPolicy and StrategyCommittee o
2、n 31 July 2008 BSI 2008ISBN 978 0 580 60566 6Amendments/corrigenda issued since publicationDate CommentsBS EN 3745-100:2008National forewordThis British Standard is the UK implementation of EN 3745-100:2008.The UK participation in its preparation was entrusted to TechnicalCommittee ACE/6, Aerospace
3、avionic electrical and fibre optictechnology.A list of organizations represented on this committee can be obtained onrequest to its secretary.This publication does not purport to include all the necessary provisionsof a contract. Users are responsible for its correct application.Compliance with a Br
4、itish Standard cannot confer immunityfrom legal obligations.BS EN 3745-100:2008EUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN 3745-100June 2008ICS 49.060English VersionAerospace series - Fibres and cables, optical, aircraft use - Testmethods - Part 100: GeneralSrie arospatiale - Fibres et cbles o
5、ptiques usagearonautique - Mthodes dessais - Partie 100 : GnralitsLuft- und Raumfahrt - Faseroptische Leitungen frLuftfahrzeuge - Prfverfahren - Teil 100: AllgemeinesThis European Standard was approved by CEN on 14 March 2008.CEN members are bound to comply with the CEN/CENELEC Internal Regulations
6、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 CEN Management Centre or to any CEN member.This European S
7、tandard 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 CEN Management Centre has the same status as theofficial versions.CEN members are the national st
8、andards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Ki
9、ngdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGManagement Centre: rue de Stassart, 36 B-1050 Brussels 2008 CEN All rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 3745-100:2008: EBS EN
10、 3745-100:2008EN 3745-100:2008 (E) 2 Contents Page Foreword3 1 Scope 4 2 Normative references 4 3 Terms and definitions .4 4 Test conditions 7 5 List of test methods.7 BS EN 3745-100:2008EN 3745-100:2008 (E) 3 Foreword This document (EN 3745-100:2008) has been prepared by the Aerospace and Defence I
11、ndustries Association of Europe - Standardization (ASD-STAN). After enquiries and votes carried out in accordance with the rules of this Association, this Standard has received the approval of the National Associations and the Official Services of the member countries of ASD, prior to its presentati
12、on to CEN. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by December 2008, and conflicting national standards shall be withdrawn at the latest by December 2008. Attention is drawn to the possibilit
13、y that some of the elements of this document may be the subject of patent rights. CEN and/or CENELEC 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 bou
14、nd to implement this European Standard: Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, S
15、witzerland and the United Kingdom. BS EN 3745-100:2008EN 3745-100:2008 (E) 4 1 Scope This standard defines terms for optical fibres and cable. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cite
16、d applies. For undated references, the latest edition of the referenced document (including any amendments) applies. IEC 50(731), International Electrotechnical Vocabulary Chapter 731: Optical fibre communication. 3 Terms and definitions For the purposes of this document, the following terms and def
17、initions apply. 3.1 optical fibre a dielectric waveguide whose core consists of optically transparent material of low attenuation and whose cladding consists of optical transparent material of lower refractive index than that of the core (see Figure 1) NOTE In general the optical fibre is furnished
18、with a primary coating (see Figure 1). 3.2 core the central region of an optical fibre through which most of the optical power is transmitted (see Figure 1) 3.3 cladding dielectric material surrounding the core of the optical fibre (see Figure 1) 3.4 fibre coating the first protective coating direct
19、ly applied to the fibre during its manufacture (see Figure 1) NOTE Its purpose is to maintain original optical performance of the fibre and to provide minimum mechanical properties. 3.5 optical cable an assembly consisting of optical fibre, inner sheath and where applicable strength members and jack
20、et (see Figure 1) 3.6 multiple fibre cable a construction in which a number of fibres are placed together in a cable 3.7 buffer a material which surrounds and is immediately adjacent to a primary coating and provides mechanical protection (see Figure 1) 3.8 strength members a protective envelope add
21、ed to the inner sheath when necessary to improve the properties of mechanical resistance (see Figure 1) BS EN 3745-100:2008EN 3745-100:2008 (E) 5 3.9 jacket a external protective covering (see Figure 1) 3.10 refractive index profile the distribution of the refractive index along the diameter of an o
22、ptical fibre NOTE The refractive index profile for simple structures can be approximated by: ararnrng= for)/(21)(1arnnrn = for21)(12with 2221212/)( nnn = where: r is the radial distance from the centre of fibre, n1is the maximum refractive index value of the core material, n2is the refractive index
23、value of the cladding material, a is the core radius, g is the profile parameter which defines the form of the profile: 10 g step index profile 1 g 3 graded index profile 3 g 10 quasi step index profile 3.11 core diameter the core diameter ( cr) is the diameter of the circle which best fits the core
24、 area. For a cross section of an optical fibre the core area is that within which the refractive index everywhere (excluding any index dip) exceeds that of the innermost homogeneous cladding by a given fraction of the difference between the maximum of the refractive index of the core (n1) and the re
25、fractive index of the innermost homogeneous cladding (n2) NOTE It is contained within the focus of points where the refractive index n3is given by: n3= n2+ k (n1 n2) n1= maximum refractive index value of core n2= refractive index value of the innermost homogeneous cladding k = a constant (unless oth
26、erwise specified a k value of 0,05 is assumed). 3.12 cladding diameter the cladding diameter ( cd) is the physical diameter of the optical fibre 3.13 concentricity error core/cladding the distance between the centre point of the core and the centre point of the cladding divided by the core diameter
27、3.14 non circularity of core the difference between the longest and the shortest chords passing through the core centre, divided by the core diameter BS EN 3745-100:2008EN 3745-100:2008 (E) 6 3.15 non circularity of cladding the difference between the longest and the shortest chords passing through
28、the cladding centre, divided by the cladding diameter 3.16 attenuation the attenuation A at the wavelength lambda between two cross sections 1 (input) and 2 (output) separated by the distance L of the fibre is defined by: A = 10 log10(P1/P2) (dB) P1= optical power traversing the cross section 1 P2=
29、optical power traversing the cross section 2 Attenuation coefficient: (alpha) = A/L (dB/unit length) NOTE For practical use, generally, these parameters are given under modal equilibrium conditions (this is not normally the case in avionic applications where lengths are short). 3.17 numerical apertu
30、re the numerical aperture NA is the maximum theoretical numerical aperture defined by: NA = 2221nn where: n1= maximum of the refractive index value of the core n2= the refractive index value of the innermost homogeneous cladding 3.18 bandwidth the value numerically equal to the lowest frequency at w
31、hich the magnitude of the baseband transfer function of an optical fibre decreases to a specified fraction, generally to one half (3 dB), of the zero frequency value Key 1 Cladding 2 Buffer (if present) 3 Jacket 4 Core 5 Fibre coating 6 Strength members (if present) Figure 1 Optical cable 1 2365 4 O
32、ptical fibre BS EN 3745-100:2008EN 3745-100:2008 (E) 7 4 Test conditions Unless stated otherwise in the test methods, the technical specification or the product standard the test conditions shall be: Temperature: (20 5) C Atmospheric pressure: 86 KPa to 106 KPa Relative humidity: 45 % to 75 % The te
33、mperature and humidity shall remain constant during a series of measurement. 5 List of test methods Table 1 General designation EN 3745 part Test designation 201 202 203 204 205 Visual examination Fibre dimensions Cable dimensions Cable longitudinal dimensional stability Table 2 Optical tests EN 374
34、5 part Test designation 301 302 303 304 305 306 Attenuation Numerical aperture Bandwidth Immunity to ambient light coupling Variation of attenuation during temperature cycling Table 3 Environmental tests EN 3745 part Test designation 401 402 403 404 405 406 407 408 409 410 411 412 Accelerated ageing
35、 Temperature cycling Thermal shock Low/High temperature bend test Cold bend test Flammability Thermal life Resistance to fluids Humidity resistance BS EN 3745-100:2008EN 3745-100:2008 (E) 8 Table 4 Mechanical tests EN 3745 part Test designation 501 502 503 504 505 506 507 508 509 510 511 512 513 514
36、 515 516 517 Optical fibre proof test Tensile strength for short length of optical fibres Scrape abrasion Micro bending test Cable tensile strength Impact resistance Cut-through Torsion Kink test Bending test Cable to cable abrasion Flexure endurance Crush resistance Cable twist bend Remove buffer “
37、Severe“ cable bend test Cable tie clamping test Table 5 Sundry tests EN 3745 part Test designation 601 602 603 Smoke density Toxicity Nuclear radiation Table 6 Handling tests EN 3745 part Test designation 701 702 703 704 705 Strippability Durability of manufacturers marking Contrast measurement BS E
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