Optical time-domain reflectometry (OTDR) In the following, we will report the results obtained with method 1, which give the most comprehensive results available in literature[6], while results obtained with the other methods are usually a lot more limited in the length of the link[7,8]. ...
Moreover, there are different distributed fiber-optic vibration sensing-technologies, such as interferometric, back-scattering based, phase-sensitive optical time domain reflectometer (Φ-OTDR), Brillouin optical time domain analysis (BOTDA) and Brillouin optical correlation domain analysis (BOCDA), etc....
2.1. Φ-OTDR of Direct Detection Combined with Coherent Detection Direct optical intensity detection can effectively determine the location and corresponding time of the vibration signal on the single-mode fiber. The direct optical intensity signal detection technique has the advantages of simple structure...
In this paper, a structural health monitoring (SHM) system is proposed to provide automatic early warning for detecting damage and its location in composite pipelines at an early stage. The study considers a basalt fiber reinforced polymer (BFRP) pipelin