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BS EN IEC 60793-1-54:2018

BS EN IEC 60793-1-54:2018

$102.76

Optical fibres – Measurement methods and test procedures. Gamma irradiation

Published By Publication Date Number of Pages
BSI 2018 20
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This document 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 can 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 studied, other test methods will be used.

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.

PDF Catalog

PDF Pages PDF Title
2 undefined
7 English
CONTENTS
9 FOREWORD
11 1 Scope
2 Normative references
3 Terms and definitions
12 4 Apparatus
4.1 General
4.2 Radiation source
4.2.1 Testing of environmental background radiation
4.2.2 Testing of adverse nuclear environments
4.3 Optical source
4.4 Optical filters/monochromators
4.5 Cladding mode stripper
4.6 Fibre support and positioning apparatus
4.7 Optical splitter
4.8 Input launch conditions
4.8.1 Class A, Category A1 fibres (graded index multimode fibres)
13 4.8.2 Class A, Category A2 fibres (quasi-step and step index fibres)
4.8.3 Class B fibres (single-mode fibres)
4.9 Detector – Signal detection electronics
4.10 Optical power meter
4.11 Radiation dosimeter
4.12 Temperature-controlled container
4.13 Test reel
5 Sampling and specimens
5.1 Specimens
5.1.1 Fibre specimen
5.1.2 Cable specimen
5.2 Test sample length
14 5.3 Test reel
5.4 Ambient light shielding
6 Procedure
6.1 General
6.2 Calibration of radiation source
6.3 Preparation and pre-conditioning
6.4 Attenuation measurement for environmental background radiation
15 6.5 Attenuation measurement for adverse nuclear environment
7 Calculations
7.1 Change in optical attenuation Δa (environmental background radiation test)
7.2 Change in optical transmittance, a (adverse nuclear environmental radiation test)
16 7.3 Normalisation of the results
8 Results
8.1 Information to be provided with each measurement
8.2 Information available upon request
17 9 Specification information
18 Bibliography

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BS EN IEC 60793-1-54:2018
$102.76