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 prEN 3745-603:20072 Con
7、tents Page Foreword2 1 Scope 3 2 Normative references 3 3 Preparation of specimens.3 4 Apparatus .3 5 Method 4 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 define
8、d in ASD-STANs General Process Manual, this standard has received approval for Publication. prEN 3745-603:20073 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 references The following ref
9、erenced 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 of electrical and optical c
10、onnection 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: Attenuation. 3 Preparation of specimens 3.1 If not at stand
11、ard 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; The length of the optical fi
12、bre/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 Apparatus Following apparatus is r
13、equired: 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 input power to a reference
14、 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. prEN 3745-603:20074 Radiation source: Two radiation sources are described; one for background radiation (method A) and
15、one for adverse nuclear environment (method B). Method A: A Co60or 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: Thermoluminesc
16、ent LiF or CaF crystal detectors (TLDs) shall be used 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
17、to within 2 C. 5 Method 5.1 Calibration of radiation 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 locati
18、on shall be averaged to minimise dose uncertainties. 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 L
19、DS and obtain a reference attenuation measurement in 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
20、 with EN 3745-301 Method C shall be performed. The test shall be 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 Opt
21、ical detector Specimen Shielded chamber Gamma Radiation source Shutter prEN 3745-603:20075 5.3 Method B: Adverse nuclear environment Testing configuration : See Figure 1. Place the specimen in the test chamber and connect it to the LLS and LDS and obtain a reference attenuation measurement in accord
22、ance 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 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 00
23、0 000 200 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 gamma irradiation cycle. The power shall also be recorded for at least 15 min after completion of the irradiation pro
24、cess 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 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.
