光纤第1-34部分:测量方法和试验程序纤维卷曲度

[中文适用范围]： IEC 60793的这一部分为机械特性建立了统一要求：未涂层光纤中的光纤卷曲或潜在曲率，即光纤的一段指定长度已被剥离涂层。光纤卷曲已被确定为在使用被动对准熔接机或主动对准大规模熔接机时最小化光纤熔接损耗的重要参数。 两种方法被认可用于测量未涂层光纤中的光纤卷曲： 方法A：侧视显微镜；方法B：激光束散射 两种方法通过确定未支撑光纤端在绕其轴旋转时发生的偏转量来测量未涂层光纤的曲率半径。方法A使用视觉或数字视频方法确定光纤的偏转，而方法B使用线传感器测量一个激光束相对于参考激光束的最大偏转。 通过测量光纤在绕其轴旋转时的偏转行为并了解测量设备的几何形状，可以从简单的圆形模型计算出光纤的曲率半径，其推导在附录C中给出。 两种方法均适用于IEC 60793（所有部分）中描述的B型光纤。 方法A是参考测试方法，用于解决争议。 [外文原描述]： IEC 60793-1-34:2021 RLV contains both the official IEC International Standard and its Redline version. The Redline version is available in English only and provides you with a quick and easy way to compare all the changes between the official IEC Standard and its previous edition. IEC 60793-1-34:2021 establishes uniform requirements for the mechanical characteristic: fibre curl or latent curvature in uncoated optical fibres, i.e. a specified length of the fibre has been stripped from coating. Fibre curl has been identified as an important parameter for minimizing the splice loss of optical fibres when using passive alignment fusion splicers or active alignment mass fusion splicers.Two methods are recognized for the measurement of fibre curl, in uncoated optical fibres: - method A: side view microscopy; - method B: laser beam scattering. Both methods measure the radius of curvature of an uncoated fibre by determining the amount of deflection that occurs as an unsupported fibre end is rotated about the fibre's axis. Method A uses visual or digital video methods to determine the deflection of the fibre while method B uses a line sensor to measure the maximum deflection of one laser beam relative to a reference laser beam. By measuring the deflection behaviour of the fibre as it is rotated about its axis and understanding the geometry of the measuring device, the fibre's radius of curvature can be calculated from simple circular models, the derivation of which are given in Annex C. Both methods are applicable to type B optical fibres as described in IEC 60793 (all parts). Method A is the reference test method, used to resolve disputes. This third edition cancels and replaces the second edition published in 2006. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition: - modification of several derivation equations for laser scattering; - change of angular increment from 10° to 30° to 10° to 45°; - change of Annex B from informative to normative.