煤矿井下光缆故障点快速判定技术

介绍了一种煤矿井下光缆故障点快速判定技术:当光传输监控设备开始告警时,首先判断故障的大致类型,然后依次采用OTDR测量法、外部巡线法和固定光源测量法判定,直至故障点位置被判定出来为止。以杨庄矿井下监控网络故障维护为例,说明了具体的故障点判定过程。现场应用表明,该技术能准确判定故障点的位置,为维护人员提供准确信息,以便及时维护。

Distributed Optical Fiber Sensor for Multi-point Temperature Measurement

The distributed optical fiber sensing technology is overviewed,which is based on Raman scattering light theory.Basic operation principle,structure,system characteristics and signal processing are discussed.This structure and method of the signal processing possess of certain spatial resolution,hence will ensure the practicability of system.

SMS Fiber Structure for Temperature Measurement Using an OTDR

A singlemode-multimode-singlemode （SMS） fiber structure for temperature measurement using an optical time domain reflectometer （OTDR）-based interrogation system is proposed. A temperature measurement range of 40 ℃-195 ℃ with a resolution of 0.12 ℃ and a linearity of 0.992 could be achieved for the multimode fiber （MMF） graded index with a length of 60mm. It was also demonstrated that two-point temperature measurement with two SMS fiber structures as temperature sensors could be made. The proposed temperature measurement system offered a high resolution and also benefited from a simple configuration with a capability of multi-point temperature measurement.

OPGW腐蚀部位检测技术

合成光纤地线(OPGW)具有由于光纤管子腐蚀造成通讯失效的风险。日本东京电力有限公司发明了一种光时域反射测量仪(OTDR),可以测量出运行的OPGW腐蚀部位产生的氢引起的信号丢失。在此发现的基础上,该公司还开发出1种检测OPGW腐蚀部位的方法。在已发生通讯失效的输电线路上采用此方法可以准确地检测出已腐蚀的部位,从而可以制定有效的维护计划,而不会漏掉所有需要维修或替换的部件。此方法也可以作为预防维护的手段。例如,此方法也可以用于天气恶劣区域输电线路的OPGW定期监测,以便在腐蚀造成通讯失效前检测出腐蚀信号。