Pressure pipeline crack identification method based on distributed optical fiber sensing technology

• Main Authors: WU ZHANJUN, XU XINSHENG, ZHOU ZHENHUAN, YUAN ZIYI, SHAN YINAN
• Format: Patent
• Language: Chinese; English
• Published: 21.08.2018
• Subjects: ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVEREDIN A SINGLE OTHER SUBCLASS; INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES; MEASURING; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS; MEASURING LENGTH, THICKNESS OR SIMILAR LINEARDIMENSIONS; MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR; PHYSICS; TARIFF METERING APPARATUS; TESTING

The invention discloses a pressure pipeline crack identification method based on a distributed optical fiber sensing technology. The method comprises the following steps: S1, obtaining basic data information, material performance data information and damage tolerance information of a detected pressure pipeline; S2, simplifying the pressure pipeline structure and performing finite element analysisto obtain strain distribution information near a crack; S3, determining the layout scheme of distributed optical fiber sensors according to a finite element analysis result in S2; S4, performing a hydraulic experiment on the simplified pressure pipeline structure in a laboratory, collecting strain measurement data of the sensors under different loads, and calculating the conversion coefficient ofoptical fiber segment spacing; S5, pasting the distributed optical fiber sensors arranged circumferentially in the axial direction of the outer wall of the pipeline at an interval of d according to afabrication completion draw