Fig. 1. Schematic diagram of the pipeline orientation

Fig. 2. Axial strain distribution on the outer surface of the simulated pipeline. (a) Front; (b) back; (c) top; (d) bottom

Fig. 3. Strain curve of different orientations of the pipeline (F=100 N)

Fig. 4. Fiber Brillouin scattering frequency measured by BOTDA

Fig. 5. Optical fiber Brillouin scattering frequency response curve for weight gain and weight loss within 1 min

Fig. 6. Variation curve of fiber Brillouin scattering frequency with load (1.0 m fiber in the center of pipeline)

Fig. 7. Variation curve of fiber Brillouin scattering frequency with load (1.0 m fiber at both ends of pipeline)