A Strain Sensor Based on OTDR for Gas Trunk Pipelines

A strain sensor based on optical time domain reflectometer (OTDR) was designed, in which an optic fiber is bonded on each detecting point. It is worth noting that the distortion of pipelines can be measured partly by detecting the strain at the joint of gas trunk pipelines. Based on detecting single point strain of markedly different from the remainder of the fiber, the loss modulation approach is suitable to monitor the distortion of gas trunk pipelines.