1、BRITISH STANDARDBS EN 3745-603:2008Aerospace series Fibres and cables, optical, aircraft use Test methods Part 603: Nuclear radiationICS 49.060g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37
2、g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58BS EN 3745-603:2008This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 July 2008 BSI 2008ISBN 978 0 580 60584 0National forewordThis British Standard is the UK implementation of EN 3745-603:2008. The
3、UK participation in its preparation was entrusted to Technical Committee ACE/6, Aerospace avionic electrical and fibre optic technology.A list of organizations represented on this committee can be obtained on request to its secretary.This publication does not purport to include all the necessary pro
4、visions of a contract. Users are responsible for its correct application.Compliance with a British Standard cannot confer immunity from legal obligations.Amendments/corrigenda issued since publicationDate CommentsEUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN 3745-603May 2008ICS 49.060English Ver
5、sionAerospace series - Fibres and cables, optical, aircraft use - Testmethods - Part 603: Nuclear radiationSrie arospatiale - Fibres et cbles optiques usagearonautique - Mthodes dessais - Partie 603 :Rayonnement nuclaireLuft- und Raumfahrt - Faseroptische Leitungen frLuftfahrzeuge - Prfverfahren - T
6、eil 603: NukleareBestrahlungThis European Standard was approved by CEN on 14 March 2008.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists
7、 and bibliographical references concerning such nationalstandards may be obtained on application to the CEN Management Centre or to any CEN member.This European Standard exists in three official versions (English, French, German). A version in any other language made by translationunder the responsi
8、bility 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 standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,France, Germany, Greece, Hungary, Iceland,
9、 Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGManagement Centre: rue de Stassart
10、, 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 3745-603:2008: E2 Contents Page Foreword3 1 Scope 4 2 Normative references 4 3 Preparation of specimens.4 4 Apparatus .4 5 Method 5 BS EN 3756-603:20083 Forewo
11、rd This document (EN 3745-603:2008) has been prepared by the Aerospace and Defence Industries 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 Associatio
12、ns and the Official Services of the member countries of ASD, prior to its presentation 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 November 2008, and conflicting national standards sha
13、ll be withdrawn at the latest by November 2008. Attention is drawn to the possibility 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
14、Regulations, the national standards organizations of the following countries are bound 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,
15、Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. BS EN 3756-603:20084 1 Scope This standard specifies a method to determine the effects of nuclear radiation on the transmission capability of an optical fibre or cable. 2 Normative
16、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 edition of the referenced document (including any amendments) applies. EN 2591-100, Aerospace series Elements
17、 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 3745-301, Aerospace series Fibres and cables, optical, aircraft use Test methods Part 301: Attenuation. 3 Preparation of spe
18、cimens 3.1 If not at standard test conditions, the specimens shall be subjected to 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 of specimens; Th
19、e length of the optical fibre/cable under test; generally (500 10) m for background radiation, 100 m adverse nuclear environment; Maximum permissible variation in attenuation; The temperature at which test is carried out; Measurement intervals; Type of the source if not of Co60; Severity. 4 Apparatu
20、s Following apparatus is required: Light launch system (LLS) and detection systems (LDS) as defined in EN 2591-100. A recording unit shall permit a continuous power measurement during the exposure time. Optical splitter: An optical splitter or a fibre optic coupler may divert a small portion of the
21、input power to a reference detector. The reference path shall be used to monitor system fluctuation for the duration of the test. Radiation source: Two radiation sources are described; one for background radiation (method A) and one for adverse nuclear environment (method B). Method A: A Co60or equi
22、valent ionising source providing a rate of 20 rad/h should be used. BS EN 3756-603:20085 Method B: A Co60or equivalent ionising source providing a desired dose rate ranging from 5 rad/s to 250 rad/s should be used. Radiation dosimeter: Thermoluminescent LiF or CaF crystal detectors (TLDs) shall be u
23、sed to measure the total radiation dose received by the specimen fibre/fibre cable. Temperature controlled container: Unless otherwise specified, the temperature controlled container shall have the capability of maintaining the specified temperature to within 2 C. 5 Method 5.1 Calibration of radiati
24、on source Calibration of the radiation source for dose uniformity and level shall be made prior to placing the device under test (DOT) in the chamber. Four TLDs shall be placed in the area of exposure. The readings of the multiple TLDs at each location shall be averaged to minimise dose uncertaintie
25、s. If a fibre reel is used, the variation in dose across its volume should not exceed 10 %. 5.2 Method A: Environmental back ground radiation test Figure 1 Testing configuration Place the specimen in the test chamber and connect it to the LLS and LDS and obtain a reference attenuation measurement in
26、 accordance with EN 3745-301 Method C. Unless otherwise specified, expose the specimen to a minimum total dose of at least 100 rad. Upon completion, and within 2 h of the irradiation process, an attenuation measurement of the specimen in accordance with EN 3745-301 Method C shall be performed. The t
27、est shall be carried out once for each requested test temperature and wavelength. 5.3 Method B: Adverse nuclear environment Testing configuration: See Figure 1. Modulated Light source Optical filters/ monochromator Input launch simulator Cladding mode stripper Lock-in amplifier Chart recorder Temper
28、atur controlled chamber Optical detector Specimen Shielded chamber Gamma Radiation source Shutter BS EN 3756-603:20086 Place the specimen in the test chamber and connect it to the LLS and LDS and obtain a reference attenuation measurement in accordance with EN 3745-301 Method C. Unless otherwise spe
29、cified, expose the specimen to at least one of the dose rate and total dose level combination specified in the Table 1. Table 1 Total dose/dose rate combinations Severity Total dose Sievert Dose rate Rad/s 1 3 000 5 2 10 000 50 3 100 000 200 4 1 000 000 200 Dose rate levels are only approximate leve
30、ls since the radiation source characteristics change. The output power from the specimen shall be recorded for the duration of the gamma irradiation cycle. The power shall also be recorded for at least 15 min after completion of the irradiation process in accordance with EN 3745-301 Method C, if not
31、 otherwise specified. The process shall be carried out once for each requested test temperature and wavelength, it will be necessary to use a new non-irradiated specimen for each temperature required. 5.4 Measurements and requirements Attenuation, during the test, should be within that specified. Af
32、ter completion of irradiation the following test shall then be carried out: EN 3745-301, Attenuation Method C, maximum change in attenuation shall be within that specified. BS EN 3756-603:2008blankBS EN 3745-603:2008BSI Group Headquarters389 Chiswick High Road,London W4 4AL, UKTel +44 (0)20 8996 900
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