1、ASD-STAN STANDARD NORME ASD-STAN ASD-STAN NORM prEN 3745-405 Edition P 1 December 2010 PUBLISHED BY THE AEROSPACE AND DEFENCE INDUSTRIES ASSOCIATION OF EUROPE - STANDARDIZATIONAvenue de Tervuren, 270 - B-1150 Brussels - Tel. 32 2 775 8126 - Fax. 32 2 775 8131 - www.asd-stan.orgICS: Descriptors: ENGL
2、ISH VERSION Aerospace series Fibres and cables, optical, aircraft use Test methods Part 405: Low/high temperature bend test Srie arospatiale Fibres et cbles optiques usage aronautique Mthodes dessais Partie 405 : Essai de courbure aux tempratures basse/haute Luft- und Raumfahrt Faseroptische Leitung
3、en fr Luftfahrzeuge Prfverfahren Teil 405: Biegeprfung bei niedriger/hoher Temperatur This “Aerospace 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 Europe
4、an Aerospace Industry. It has been technically approved by the experts of the concerned Domain following 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, withou
5、t re-identification of the standard. After examination and review by users and formal agreement of ASD-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 me
6、mbers have then to implement the EN at national level by giving the EN the status of a national standard and by withdrawing any national standards conflicting with the EN. Edition approved for publication 31 December 2010 Comments should be sent within six months after the date of publication to ASD
7、-STAN Electrical Domain Copyright 2010 by ASD-STAN prEN 3745-405:2010 (E) 2 Contents Page Foreword. 2 1 Scope . 3 2 Normative references . 3 3 Preparation of specimens 3 4 Apparatus 4 5 Method . 5 Foreword This standard was reviewed by the Domain Technical Coordinator of ASD-STANs Electrical Domain.
8、 After inquiries and votes carried out in accordance with the rules of ASD-STAN defined in ASD-STANs General Process Manual, this standard has received approval for Publication. prEN 3745-405:2010 (E) 3 1 Scope This standard specifies a method of determining the attenuation variation of an optical c
9、able during mechanical bending under load at the maximum and minimum operating temperatures. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edit
10、ion 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 Part 100: General EN 3745-201, Aerospace s
11、eries Fibres and cables, optical, aircraft use Test methods Part 201: Visual examination EN 3745-301, Aerospace series Fibres and cables, optical, aircraft use Test methods Part 301: Attenuation 3 Preparation of specimens 3.1 If not at the standard test conditions, the specimens shall be subjected t
12、o standard test conditions and stabilized at these conditions for 24 h as defined in EN 3745-100. 3.2 The following details shall be specified if not already included in the product standard: The number and length of specimens. The upper and lower temperatures at which test is carried out. The mandr
13、el diameter and number of wraps. The maximum permissible variation in attenuation. The required loads to be applied during the test. The wavelengths to be measured. prEN 3745-405:2010 (E) 4 4 Apparatus 4.1 The apparatus shall comprise: A Light Launch System (LLS) as defined in EN 2591-100. A Light D
14、etection System (LDS) as defined in EN 2591-100. A test fixture suitable for attaching the specimen with weights to a rotating mandrel. A suitable environmental chamber capable of meeting the specified temperatures 2 C. A typical arrangement is shown in Figure 1. Key 1 Fibre optic cable 2 Loads 3 Ma
15、ndrel 4 Winding direction 5 LLS 6 LDS Figure 1 5 1 4 2 63 prEN 3745-405:2010 (E) 5 5 Method 5.1 Procedure 1) Connect the specimen to the LLS and LDS. 2) Place specimen in the environmental chamber and attach the specimen to the mandrel, in preparation for winding. 3) Attach loads to source and detec
16、tion end of cable. 4) Measure the initial optical transmittance measurements at wavelengths according to the applicable product standard to establish a reference. 5) Condition the specimen for four (4) hours at the low temperature test condition specified in the applicable product standard. 6) Measu
17、re the optical transmittance values at the end of the four (4) hours conditioning at the low temperature test condition prior to winding on the mandrel. 7) After the four (4) hours conditioning period and while the cable is still at the test temperature, wind cable two turns on to the mandrel using
18、a steady rate of two turns per minute. While specimen is still wrapped on the mandrel measure the optical transmittance. 8) Unwind the specimen and measure the optical transmittance. 9) Allow the specimen to come to room temperature. 10) Repeat steps 5 through 9 at the high temperature test conditio
19、n specified in the applicable product standard. 5.2 Final measurements and requirements The difference in attenuation of the conditioned specimen before and after mandrel winding at both temperatures shall be less than the specified value in the applicable product standard. Perform a visual examination according to EN 3745-201 Visual examination
