IEC 60793-1-54:2018 光纤 - 第1-54部分:测量方法和测试程序 - 辐射

标准编号：IEC 60793-1-54:2018

中文名称：光纤 - 第1-54部分:测量方法和测试程序 - 辐射

英文名称：Optical fibres - Part 1-54: Measurement methods and test procedures - Gamma irradiation

发布日期：2018-01-12

标准范围

新的！IEC 60793-1-54:2018作为IEC 60793-1-54:2018 RLV提供，其中包含国际标准及其红线版本，显示了与上一版本相比技术内容的所有变化。IEC 60793-1-54:2018概述了一种用于测量暴露于伽马辐射的光纤和光缆的稳态响应的方法。它可用于确定B类单模或A类、A1类和A2类多模光纤（电缆或非电缆形式）由于暴露于γ辐射而产生的辐射诱导衰减水平。当暴露于γ辐射时，电缆和未电缆光纤的衰减通常增加。这主要是由于辐射分解电子和空穴在玻璃中的缺陷位点(即。“颜色中心”的形成）。本试验程序侧重于两种感兴趣的方案:适用于估计环境本底辐射影响的低剂量率方案和适用于估计不利核环境影响的高剂量率方案。环境背景辐射影响的测试是通过类似于IEC 60793-1-40方法A，削减的衰减测量方法实现的。通过监测测试样品暴露于γ辐射之前、期间和之后的功率来测试不利核环境的影响。光（光漂白）或热使色心减少导致恢复（辐射引起的衰减减少）。恢复可以在很宽的时间范围内发生，这取决于辐照时间和退火温度。这使得辐射诱导衰减的表征复杂化，因为衰减取决于许多变量，包括测试环境的温度、样品的配置、施加到样品的总剂量和剂量率以及用于测量样品的光水平。本测试不是光纤电缆非光学材料组件的材料测试。如果研究暴露于辐射的电缆材料的降解，将使用其他测试方法。？本测试方法包含清晰、简明的说明列表。IEC TR 62283中单独介绍了执行正确、相关和有表现力的辐照试验以及限制测量不确定度所需的背景知识。这第三版取消并取代了2012年出版的第二版。本版构成技术修订版。与上一版相比，此版本包括以下重大技术变更:-改变了与光漂白相关的试验条件；-已修改测试长度以在辐照结束时在测试样品中产生3dB至10dB之间的总诱导衰减。

NEW!IEC 60793-1-54:2018 is available as IEC 60793-1-54:2018 RLV which contains the International Standard and its Redline version, showing all changes of the technical content compared to the previous edition.

IEC 60793-1-54:2018 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. This third edition cancels and replaces the second edition published in 2012. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition:
- test conditions related to photobleaching have been changed;
- the test length has been modified to yield a total induced attenuation in the test sample at the end of the irradiation between 3 dB and 10 dB.

标准预览图