利用水电容的FFT在线预测结构回波损耗  

On-line prediction of SRL by FFT of cable capacitance in water

作　　者：李敏[1] 赵洪[1] 姜华[1] 

机构地区：[1]哈尔滨理工大学,黑龙江哈尔滨150040

出　　处：《电线电缆》2004年第2期17-19,22,共4页Wire & Cable

摘　　要：结构回波损耗是通信电缆的重要指标之一,而电缆绝缘线芯的水电容可综合反映生产线上的周期性缺陷。本文讨论了在线预测结构回波损耗的意义,以及利用水电容的快速傅立叶变换(FFT)预测结构回波损耗的原理,提出不仅把参数控制在允许的偏差范围以内,还要监测其波动情况,为查找周期性缺陷源提供有用信息,得出电缆适应的载波带宽。SRL(structural return loss) is one of the important indicators of telecom cables, while the capacitance in water of cable may reflect the periodic defect of the production line. This paper discusses the significance of on-line prediction of SRL and the principle of the prediction of SRL by FFT (fast Fourier transformation) of cable capacitance in water, indicating that it is necessar not only to control the parameters within the tolerances but monitor their fluctuation. This paper provides useful information for the diagnostic of the cause responsible for periodic defects so that appropriate carrier bandwidth may be obtained.

关 键 词：通信电缆 FFT 水电容 在线预测 结构回波损耗 电缆绝缘线芯 

分 类 号：TM248[一般工业技术—材料科学与工程]