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首页> 外文期刊>Smart Materials & Structures >Online monitoring of the distributed lateral displacement in large AC power generators using a high spatial resolution Brillouin optical fiber sensor
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Online monitoring of the distributed lateral displacement in large AC power generators using a high spatial resolution Brillouin optical fiber sensor

机译：使用高分辨率的布里渊光纤传感器在线监测大型交流发电机中的横向分布位移

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摘要

We report for the first time, to the best of our knowledge, online monitoring of the distributed lateral displacement in large AC power generators using high spatial resolution differential pulse-width pair Brillouin optical time-domain analysis (DPP-BOTDA). To perform the measurement of distributed lateral displacements with periods of only a few cm in large AC power generators, a 2cm spatial resolution strain measurement is realized using the differential pulse pair of 8/8.2 ns in DPP-BOTDA, and then the lateral displacements are reconstructed according to the strain-displacement relation with the assumption of a sine shape function. Using different fiberglass ripple springs, two types of lateral displacement with periods of 3 and 3.25cm are demonstrated, obtaining a maximum displacement of 0.43mm with a measurement accuracy of ～ 40νm. This provides the information on the stator coil tightness through online monitoring of the distributed lateral displacement caused by the fiberglass ripple springs, and ensures safe operating conditions for large AC power generators. In addition, the large number of sensing points associated with distributed optical fiber sensors make it economically and technically practical to monitor large numbers of key components in a generator without any interference from the large magnetic and electrical fields.
机译：据我们所知，我们首次使用高空间分辨率差分脉宽对布里渊光学时域分析（DPP-BOTDA）在线监视大型交流发电机中的分布侧向位移。为了在大型交流发电机中以仅几cm的周期进行分布的横向位移测量，使用DPP-BOTDA中的8 / 8.2 ns的差分脉冲对实现了2cm的空间分辨率应变测量，然后将横向位移计算为在假定正弦形状函数的情况下，根据应变-位移关系重构。使用不同的玻璃纤维波纹弹簧，展示了两种类型的侧向位移，周期分别为3和3.25cm，获得的最大位移为0.43mm，测量精度为〜40νm。通过在线监视由玻璃纤维波纹弹簧引起的分布侧向位移，可提供有关定子线圈紧密度的信息，并确保大型交流发电机的安全运行条件。另外，与分布式光纤传感器相关联的大量传感点使其在经济和技术上切实可行地监视发电机中的大量关键组件，而不受大型磁场和电场的任何干扰。

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