1、ASD STANDARD NORME ASD ASD NORM prEN 3745-603 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 603: Nuclear radiation Srie arospatiale Fibres et cbles optiques usage aronautique Mthodes dessais Partie 603 : Rayonnement nuclaire Luft- und Raumfahrt Faseroptische Leitungen fr Luftfahrzeuge Prfverfahren Teil 603: Nukl
3、eare Bestrahlung 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 European Aerospace Industry. It has been technically approved by the expert
4、s 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, without re-identification of the standard. After examination and review by
5、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 members have then to implement the EN at national level by giving the E
6、N the status of a national standard 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 Copyright European Asso
7、ciation of Aerospace Industries Provided by IHS under license with AECMA Not for ResaleNo reproduction or networking permitted without license from IHS-,-,-prEN 3745-603:20072 Contents Page Foreword2 1 Scope 3 2 Normative references 3 3 Preparation of specimens.3 4 Apparatus .3 5 Method 4 Foreword T
8、his 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 General Process Manual, this standard has received approval for Publication. Copyright European Associatio
9、n of Aerospace Industries Provided by IHS under license with AECMA Not for ResaleNo reproduction or networking permitted without license from IHS-,-,-prEN 3745-603:20073 1 Scope This standard specifies a method to determine the effects of nuclear radiation on the transmission capability of an optica
10、l fibre or cable. 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 edition of the referenced document (including any amendments) applies. EN 2591-
11、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. 1)EN 3745-301, Aerospace series Fibres and cables, optical, aircraft use Test methods Part 301: A
12、ttenuation. 3 Preparation of specimens 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 stand
13、ard: The number of specimens; The 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 n
14、ot of Co60; Severity. 4 Apparatus 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 ma
15、y divert a small portion of the input power to a reference detector. The reference path shall be used to monitor system fluctuation for the duration of the test. 1) Published as ASD Prestandard at the date of publication of this standard. Copyright European Association of Aerospace Industries Provid
16、ed by IHS under license with AECMA Not for ResaleNo reproduction or networking permitted without license from IHS-,-,-prEN 3745-603:20074 Radiation source: Two radiation sources are described; one for background radiation (method A) and one for adverse nuclear environment (method B). Method A: A Co6
17、0or equivalent ionising source providing a rate of 20 rad/h should be used. 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 used to measur
18、e 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 radiation source Cal
19、ibration 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 uncertainties. If a fibre
20、 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 accordance
21、 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 test shall b
22、e carried out once for each requested test temperature and wavelength. Modulated Light source Optical filters/ monochromator Input launch simulator Cladding mode stripper Lock-in amplifier Chart recorder Temperatur controlled chamber Optical detector Specimen Shielded chamber Gamma Radiation source
23、Shutter Copyright European Association of Aerospace Industries Provided by IHS under license with AECMA Not for ResaleNo reproduction or networking permitted without license from IHS-,-,-prEN 3745-603:20075 5.3 Method B: Adverse nuclear environment Testing configuration : See Figure 1. Place the spe
24、cimen 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 specified, expose the specimen to at least one of the dose rate and total dose level combination specified in the Table 1. Table 1 Tota
25、l 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 levels since the radiation source characteristics change. The output power from the specimen shall be recorded for the duration of the g
26、amma 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 otherwise specified. The process shall be carried out once for each requested test temperature and wavelength, it will be necessary
27、 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. After 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. Copyright European Association of Aerospace Industries Provided by IHS under license with AECMA Not for ResaleNo reproduction or networking permitted without license from IHS-,-,-
