Hivatkozási szám

MSZ EN 60793-1-54:2013

Dokumentumazonosító

155152

Cím

Fényvezető szálak. 1-54. rész: Mérési módszerek és vizsgálati eljárások. Radioaktív besugárzás (IEC 60793-1-54:2012)

Angol cím

Optical fibres. Part 1-54: Measurement methods and test procedures. Gamma irradiation (IEC 60793-1-54:2012)

Alkalmazási terület

This part of IEC 60793 outlines a method for measuring the steady state response of optical fibres and optical cables exposed to gamma radiation. It can be employed to determine the level of radiation induced attenuation produced in Class B single-mode or Class A, category A1 and A2 multimode optical fibres, in either cabled or uncabled form, due to exposure to gamma radiation. The attenuation of cabled and uncabled optical fibres generally increases when exposed to gamma radiation. This is primarily due to the trapping of radiolytic electrons and holes at defect sites in the glass (i.e. the formation of “colour centres”). This test procedure focuses on two regimes of interest: the low dose rate regime suitable for estimating the effect of environmental background radiation, and the high dose rate regime suitable for estimating the effect of adverse nuclear environments. The testing of the effects of environmental background radiation is achieved with an attenuation measurement approach similar to IEC 60793-1-40 Method A, cut-back. The effects of adverse nuclear environments are tested by monitoring the power before, during and after exposure of the test sample to gamma radiation. The depopulation of colour centres by light (photo bleaching) or by heat causes recovery (lessening of radiation induced attenuation). Recovery may occur over a wide range of time which depends on the irradiation time and annealing temperature. This complicates the characterization of radiation induced attenuation since the attenuation depends on many variables including the temperature of the test environment, the configuration of the sample, the total dose and the dose rate applied to the sample and the light level used to measure it. This test is not a material test for the non-optical material components of a fibre optic cable. If degradation of cable materials exposed to irradiation is to be studied, other test methods will be required. This test method is written to contain a clear, concise listing of instructions. The background knowledge that is necessary to perform correct, relevant and expressive irradiation tests as well as to limit measurement uncertainty is presented separately in IEC/TR 62283. Attention is drawn to the fact that strict regulations and suitable protective facilities are to be adopted in the laboratory for this test. Carefully selected trained personnel shall be used to perform this test. It can be extremely hazardous to test personnel if it is improperly performed or without qualified conditions.

ICS

33.180.10 Szálak és kábelek

Műszaki Bizottság

A szabvány nyelve

angol

Az érvényesség kezdete

2013-04-01

A visszavonás napja

2021-02-16

Forrás

idt IEC 60793-1-54:2012; idt EN 60793-1-54:2013

Előd

MSZ EN 60793-1-54:2004

Utód

MSZ EN IEC 60793-1-54:2018

Módosítás

Kiegészítő információk

SZK-közlemények

Kapcsolódó európai jogszabály

A szabvány

kapható formátuma

Papír ,
PDF (letöltés) (a fájl mérete: 396023) ,

oldalszáma

13 oldal; G kategória

ára

Nettó: 8000 Ft
Bruttó:
Papír formátum esetén (5% Áfával): 10080 Ft
PDF (letöltés) formátum esetén (27% Áfával): 10160 Ft