CN113348352B - 架空光缆检查方法、架空光缆检查装置以及程序 - Google Patents
架空光缆检查方法、架空光缆检查装置以及程序 Download PDFInfo
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Abstract
本发明的目的是提供能够根据振动的感测结果来确定线缆松弛区间的架空光缆检查方法、架空光缆检查装置以及程序。本发明涉及的架空光缆检查方法,输入使用光纤振动感测装置来测定的、架空光缆的沿长度方向的振动分布波形,并算出该振动分布波形的各位置处的振幅的标准偏差,将该标准偏差和其他区间相比较大的区间确定为线缆松弛区间。
Description
技术领域
本公开涉及通过从通信大楼进行光试验而确定架空光缆的松弛区间的技术。
背景技术
为了防止通信服务中断,光通信运营商对通信设备的健全性进行检查。作为检查项目之一,可列举架空线缆有无松弛。目前,线缆有无松弛的检查作业通过作业员在赶赴现场以目视进行。为了使该检查作业高效化,进行了非专利文献1(以下称为现有技术1)记载的研究。在非专利文献1中,报告了从通信大楼对被储存在线缆的光纤进行光试验,通过测定施加于光纤的外部干扰引起的振动,从远距离处判断线缆有无松弛的概念。
现有技术文献
非专利文献
非专利文献1:野引敦,“光传输介质技术的研发动向,”NTT技术期刊,pp.48-52,2018.
非专利文献2:Y.Achkire,“Active tendon control of cable-stayed briges,”Ph.D.dissertation,Active Structures Laboratory,Universite Libre de Bruxelles,Belguim,1997.
发明内容
发明所要解决的课题
然而,在现有技术1中,作为静态现象的线缆松弛和作为动态现象的振动的关系还不清楚,并且还没有确立根据振动的感测结果来确定作为静态现象的线缆松弛区间的具体方式。
因此,本发明的目的是提供未确立的、能够根据振动的感测结果来确定线缆松弛区间的架空光缆检查方法、架空光缆检查装置以及程序。
用于解决课题的手段
为了实现上述目的,本发明涉及的架空光缆检查方法,设置为根据振动的感测结果获取线缆的沿长度方向的振动分布,基于振动分布的各点的振幅的标准偏差确定线缆松弛区间。
具体地,本发明涉及的架空光缆检查方法,其特征在于,进行:
获取工序,获取架空光缆的沿长度方向的振动分布;
计算工序,算出所述振动分布的各位置处的振幅的标准偏差;
解析工序,基于所述标准偏差来确定所述架空光缆松弛的线缆松弛区间。
此外,本发明涉及的架空光缆检查装置,包括:
计算电路,输入架空光缆的沿长度方向的振动分布,并算出所述振动分布的各位置处的振幅的标准偏差;和
解析电路,基于所述标准偏差确定所述架空光缆松弛的线缆松弛区间。
在振动分布中,在各点的振动的平均值的波形中没有发现由有无松弛引起的差异,但是在标准偏差的波形中发现差异,因此能够确定松弛区间。因此,本发明能够提供可根据振动的感测结果来确定线缆松弛区间的架空光缆检查方法以及架空光缆检查装置。
具体的判断基准如下所示。
(1)在所述解析工序中,其特征在于,将所述标准偏差大于将所述架空光缆的沿长度方向的各位置的所述标准偏差进行平均化的值的区间设为线缆松弛区间。
(2)在所述解析工序中,其特征在于,在所述架空光缆的沿长度方向的任意区间,在被包含在所述任意区间的各位置的所述标准偏差的方差比预设的阈值大的情况下,将所述任意区间设为所述线缆松弛区间。
(3)在所述解析工序中,其特征在于,将所述标准偏差大于预设的阈值的区间设为所述线缆松弛区间。
此外,本发明是用于使计算机作为所述架空光缆检查装置而起作用的程序。本发明涉及的架空光缆检查装置,也能够通过计算机和程序实现,也可以将程序存储在存储介质,或者通过网络提供。
另外,上述各发明可以尽可能地进行组合。
发明效果
本发明能够提供可根据振动的感测结果来确定线缆松弛区间的架空光缆检查方法、架空光缆检查装置以及程序。
附图说明
图1是说明本发明的架空光缆检查方法的图。
图2是说明本发明的架空光缆检查方法的原理的图。
图3是说明由本发明的架空光缆检查方法带来的检查结果的图。
图4是说明本发明的架空光缆检查方法的流程图。
图5是说明本发明的架空光缆检查装置的图。
具体实施方式
参照附图对本发明的实施方式进行说明。以下说明的实施方式是本发明的实施例,本发明并不限于以下的实施方式。此外,在本说明书以及附图中符号相同的技术特征表示彼此相同的技术特征。
图1表示本发明的光缆振动感测所实现的确定线缆松弛区间的实施例。在此,1是光纤振动感测装置,2是光缆,3是容纳在光缆中的光纤。表示通过图1的结构能够确定架空线缆的松弛区间。
架空线缆相对于外力的变形在非专利文献2中被讨论,被记载在(1)-(2)式(分别是p.13以及p.11)。对使用了图2(A)和图2(B)的模型的情况的(1)-(2)式进行说明。由于受到外力,架空线缆的微小区间从平衡状态位移。将朝x方向的位移量设为u,朝y方向的位移量设为v,朝z方向的位移量设为w。如果假设高阶的微分项带来的对变形的贡献较小,则线缆长度方向的变形ε不依赖于位移量v,而由下式给出。
[数1]
在此,ws表示线缆相对于位置x的松弛度。另外,松弛度ws由下式给出。
[数2]
ws(x)=4d·[-(x/l)2+x/l],(0≤x≤l) (2)
在此,d表示松弛度的最大值。如果将(2)式代入(1)式则得到下式。
[数3]
ε=εu+4d·(-2x/l2+1/l)·εw (3)
[数4]
εu和εw分别表示从平衡状态朝x方向和z方向的位移所引起的变形量。
如果考虑来自自然环境的外部干扰,则εu和εw分别独立。此外,由于εu和εw表示相对于平衡状态的变形量,因此其时间平均是零。因此,以(3)式给出的变形的平均值με和标准偏差σε成为下式。
[数5]
με=0 (5)
[数6]
在此,和/>分别表示εu和εw的方差值。
平均值不依赖于松弛度d,而标准偏差依赖于松弛度d,通过计算作为动态现象的振动的方差值,能够确定线缆松弛区间。标准偏差也依赖于εu和εw,但风等的外部干扰随线缆跨度而变化的情况很少,可以将εu和εw视为大致恒定。因此,施加于线缆的变形ε的标准偏差σε依存于松弛度d,通过对随着线缆跨度的变形,即振动的标准偏差进行比较,能够确定线缆松弛区间。
图5是图1所示的光纤振动感测装置1的功能框图。光纤振动感测装置1包括光纤反射测量部11、数据存储部12以及标准偏差解析部13。光纤反射测量部11接收射入到测量对象的光缆的试验光的后方散射光,获得架空光缆的沿长度方向的振动分布。光纤反射测量部11例如是OTDR(Optical Time Domain Reflectometer)。数据存储部12存储该振动分布。
标准偏差解析部13相当于本发明的架空光缆检查装置。标准偏差解析部13包括计算电路13a和解析电路13b,
计算电路13a通过数据存储部12输入架空光缆的沿长度方向的振动分布、并算出所述振动分布的各位置处的振幅的标准偏差,
解析电路13b基于所述标准偏差来确定所述架空光缆松弛的线缆松弛区间。
图4是说明光纤振动感测装置1所进行的架空光缆检查方法的图。即,光纤振动感测装置1进行以下工序:在光纤反射测量部11获取架空光缆的沿长度方向的振动分布的获取工序S01,在标准偏差解析部13算出所述振动分布的各位置处的振幅的标准偏差的计算工序S02,和基于所述标准偏差来确定所述架空光缆松弛的线缆松弛区间的解析工序S03。
即,在获取工序S01进行光纤振动感测。在计算工序S02,针对光缆长度方向的各区间的振动波形,算出其振幅的标准偏差。在解析工序S03中,将振幅的标准偏差比其他区间的标准偏差大的区间确定为线缆松弛区间。
图3是说明在光纤反射测量部11测定的架空线缆的振动分布(A),和在标准偏差解析部13的计算电路13a根据振动分布算出的平均值(B)以及标准偏差(C)的图。在振动的平均值的波形中没有发现由有无松弛引起的差异,但是在标准偏差的波形中发现差异,因此能够确定松弛区间。
在此,说明解析电路13b所进行的确定具体的松弛区间的方法。
(确定方法1)对各点的振动的标准偏差进行平均化,将比其平均值大之处设为松弛区间。即,在解析工序S03中,将所述标准偏差大于将所述架空光缆的沿长度方向的各位置的所述标准偏差进行平均化的值的区间设为所述线缆松弛区间。
(确定方法2)将各点的振动的标准偏差的波动较大之处设为松弛区间。即,在解析工序S03中,在所述架空光缆的沿长度方向的任意区间,在被包含在所述任意区间的各位置的所述标准偏差的方差大于预设的阈值的情况下,将所述任意区间设为所述线缆松弛区间。例如,在图3的情况下,由于距离为1962~2035m的区间与距离为2035~2100m的区间相比标准偏差的波动较大,因此将该区间设为松弛区间。
(确定方法3)对标准偏差设置阈值,将比阈值大的标准偏差之处设为松弛区间。即,在解析工序S03中,将所述标准偏差大于预设的阈值的区间设为所述线缆松弛区间。
(发明的效果)
本发明的架空光缆松弛区间的确定方法,相对于现有技术1具有以下的优势。在现有技术1中,线缆松弛和光纤振动感测结果的关系并未明确,用于确定线缆松弛而测定的物理量不清楚。在本发明中,通过用线缆松弛使光纤的振动的标准偏差增加,能够确定线缆松弛区间。
符号说明
1:光纤振动感测装置
2:光缆
3:光纤
11:光纤反射测量部
12:数据存储部
13:标准偏差解析部
13a:计算电路
13b:解析电路
Claims (3)
1.架空光缆检查方法,其特征在于,进行:
获取工序,用光纤反射测量器接收入射到测量对象架空光缆的试验光的后方散射光,获取来自自然环境的外部干扰引起的振动在所述架空光缆的沿长度方向的振动分布;
计算工序,算出用数学式C1表示的、所述振动分布的各位置处的振幅的标准偏差;和,
解析工序,基于所述标准偏差来确定所述架空光缆松弛的线缆松弛区间;
在所述解析工序中,
将所述标准偏差大于将所述架空光缆的沿长度方向的各位置的所述标准偏差进行平均化的值的区间设为所述线缆松弛区间,或者,
在所述架空光缆的沿长度方向的任意区间,在被包含在所述任意区间的各位置的所述标准偏差的方差大于预设的阈值的情况下,将所述任意区间设为所述线缆松弛区间,或者,
将所述标准偏差大于预设的阈值的区间设为所述线缆松弛区间;
【数学式C1】
其中,x表示所述架空光缆的长度方向的位置,d表示所述架空光缆的松弛度的最大值,l表示架设所述架空光缆的杆间距离,和/>分别为/>和/>的方差值,/>和/>分别表示位置x处从平衡状态朝x方向和与地面垂直的z方向的位移所引起的变形量。
2.架空光缆检查装置,其特征在于,包括:
光纤反射测量部,接收入射到测量对象架空光缆的试验光的后方散射光,获取来自自然环境的外部干扰引起的振动在所述架空光缆的沿长度方向的振动分布;
计算电路,输入所述振动分布,并算出用数学式C1表示的、所述振动分布的各位置处的振辐的标准偏差;和
解析电路,基于所述标准偏差确定所述架空光缆松弛的线缆松弛区间;
在所述解析电路中,
将所述标准偏差大于将所述架空光缆的沿长度方向的各位置的所述标准偏差进行平均化的值的区间设为所述线缆松弛区间,或者,
在所述架空光缆的沿长度方向的任意区间,在被包含在所述任意区间的各位置的所述标准偏差的方差大于预设的阈值的情况下,将所述任意区间设为所述线缆松弛区间,或者,
将所述标准偏差大于预设的阈值的区间设为所述线缆松弛区间;
【数学式C1】
其中,x表示所述架空光缆的长度方向的位置,d表示所述架空光缆的松弛度的最大值,l表示架设所述架空光缆的杆间距离,和/>分别为/>和/>的方差值,/>和/>分别表示位置x处从平衡状态朝x方向和与地面垂直的z方向的位移所引起的变形量。
3.程序,用于使计算机作为权利要求2所述的架空光缆检查装置而起作用。
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