1、ASD STANDARD NORME ASD ASD NORM prEN 3745-100 Edition P 1 May 2007 PUBLISHED BY THE AEROSPACE AND DEFENCE INDUSTRIES ASSOCIATION OF EUROPE - STANDARDIZATION Avenue de Tervuren, 270 - B-1150 Brussels - Tel. + 32 2 775 8126 - Fax. + 32 2 763 3565 - www.asd-stan.orgICS: 49.060 Descriptors: ENGLISH VERS
2、ION Aerospace series Fibres and cables, optical aircraft use Test methods Part 100: General Srie arospatiale Fibres et cbles optiques usage aronautique Mthodes dessais Partie 100 : Gnralits Luft- und Raumfahrt Faseroptische Leitungen fr Luftfahrzeuge Prfverfahren Teil 100: Allgemeines This “Aerospac
3、e Series“ Prestandard has been drawn up under the responsibility of ASD-STAN (The AeroSpace and Defence Industries Association of Europe - Standardization). It is published for the needs of the European Aerospace Industry. It has been technically approved by the experts of the concerned Domain follo
4、wing member comments. Subsequent to the publication of this Prestandard, the technical content shall not be changed to an extent that interchangeability is affected, physically or functionally, without re-identification of the standard. After examination and review by users and formal agreement of A
5、SD-STAN, it will be submitted as a draft European Standard (prEN) to CEN (European Committee for Standardization) for formal vote and transformation to full European Standard (EN). The CEN national members have then to implement the EN at national level by giving the EN the status of a national stan
6、dard and by withdrawing any national standards conflicting with the EN. Edition approved for publication 31 May 2007 Comments should be sent within six months after the date of publication to ASD-STAN Electrical Domain Copyright 2007 by ASD-STAN prEN 3745-100:20072 Contents Page Foreword2 1 Scope 3
7、2 Normative references 3 3 Terms and definitions .3 4 Test conditions 6 5 List of test methods.6 Foreword This standard was reviewed by the Domain Technical Coordinator of ASD-STANs Electrical Domain. After inquiries and votes carried out in accordance with the rules of ASD-STAN defined in ASD-STANs
8、 General Process Manual, this standard has received approval for Publication. prEN 3745-100:20073 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,
9、only the edition cited 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 fo
10、llowing terms and definitions 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 optica
11、l fibre is furnished 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 prot
12、ective coating directly 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 stre
13、ngth members and jacket (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 pr
14、otective envelope added to the inner sheath when necessary to improve the properties of mechanical resistance (see Figure 1) prEN 3745-100:20074 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 op
15、tical 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 v
16、alue 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
17、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 ref
18、ractive 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 othe
19、rwise 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 3
20、.14 non circularity of core the difference between the longest and the shortest chords passing through the core centre, divided by the core diameter prEN 3745-100:20075 3.15 non circularity of cladding the difference between the longest and the shortest chords passing through the cladding centre, di
21、vided 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= optical power traversin
22、g 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 aperture the numerical apertu
23、re 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 which the magnitude of t
24、he 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 2 3 6 5 4 Optical fibre prEN 37
25、45-100:20076 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 temperature and humidity shall remain consta
26、nt 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 Wall thickness Cable longitudinal dimensional stability Table 2 Optical tests EN 3745 part Test designation 301
27、 302 303 304 305 306 Attenuation Numerical aperture Bandwidth Backs cattering 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 Temperatur
28、e cycling Thermal shock Cold bend test Flammability Thermal life Resistance to fluids Humidity resistance prEN 3745-100:20077 Table 4 Mechanical tests EN 3745 part Test designation 501 502 503 504 505 506 507 508 509 510 511 512 513 Optical fibre proof test Tensile strength for short length of optic
29、al 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 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
