An FBG-based high-sensitivity structure and its application in non-intrusive detection of pipeline

Pipeline is one of the main transportation ways with increasingly wide applications in various fields. Generally, pipelines are operated under high pressure, leakage accidents extremely dangerous and it necessary to ensure safety pipelines. In this study, a non-intrusive structure high-sensitivity based on fiber Bragg grating (FBG) sensing proposed for detection pipeline pressure. The core ditrigon strain beam that can transmit outside wall designed an amplification function. Further, theoretical analyses structural sensitivity deduced, optimization implemented. To verify practical function effectiveness structure, laboratory experiments conducted results indicate amplify coefficient 5.44, has obvious advantages convenient installation simple-structure.