光纤 第1-46部分：测量方法和试验程序 衰减变化的监测

[中文适用范围]： 本部分 IEC 60793 建立了监测衰减变化的统一要求，从而有助于商业用途的光纤和光缆的检查。 本文件给出了两种方法来监测光纤和光缆在机械或环境测试期间发生的衰减变化。它提供了由于光学不连续性、物理缺陷和衰减斜率变化引起的衰减特性变化的监测： - 方法 A：通过传输功率测量衰减变化； - 方法 B：通过反向散射测量衰减变化。 方法 A 和 B 适用于以下所有类别光纤的监测： - 类别 A：多模光纤； - 类别 B：单模光纤； - 类别 C：单模互连光纤。 两种测量方法的共同信息包含在第 1 条至第 10 条中，每种方法的具体信息分别见附录 A 和附录 B。 [外文原描述]： IEC 60793-1-46:2024 CMV contains both the official standard and its commented version. The commented version provides you with a quick and easy way to compare all the changes between IEC 60793-1-46:2024 edition 2.0 and the previous IEC 60793-1-46:2001 edition 1.0. Furthermore, comments from IEC SC 86A experts are provided to explain the reasons of the most relevant changes, or to clarify any part of the content. IEC 60793-1-46:2024 establishes uniform requirements for the monitoring of changes in attenuation, thereby assisting in the inspection of fibres and cables for commercial purposes. This document gives two methods for monitoring the changes in attenuation of optical fibres and cables that occur during mechanical or environmental testing, or both. It provides a monitor in the change of attenuation characteristics arising from optical discontinuity, physical defects and modifications of the attenuation slope: - method A: change in attenuation by transmitted power; - method B: change in attenuation by backscattering. Methods A and B apply to the monitoring of all categories of the following fibres: - class A: multimode fibres; - class B: single-mode fibres; - class C: single-mode intraconnection fibres. Information common to both measurements is contained in Clause 1 to Clause 10, and information pertaining to each individual method appears in Annex A, and Annex B respectively.