Fig. 1. Rayleigh scattering process in fiber

Fig. 2. Configuration of DAS system

Fig. 3. Belt conveyor system to be tested. (a) 30 m belt conveyor test system; (b) idler structure

Fig. 4. Location of optical cable installation in belt conveyor

Fig. 5. Idler simulation faults. (a) Stuck; (b) no bearing; (c) fracture

Fig. 6. Top view of corresponding relationship between optical cable and belt conveyor fault point

Fig. 7. Flow chart of data analysis method

Fig. 8. Amplitude value-time corresponding curves of idler under different working conditions. (a) Nomal idler; (b) stuck; (c) no bearing; (d) fracture

Fig. 9. RMS value-time corresponding curves of idler under different working conditions. (a) Nomal idler; (b) stuck; (c) no bearing; (d) fracture

Fig. 10. RMS curves of corresponding positions of fault points of belt conveyor

Fig. 11. FFT frequency domain curves of idler under different working conditions. (a) Nomal idler; (b) stuck; (c) no bearing; (d) fracture

Fig. 12. Time-frequency diagram of idler under different working conditions. (a) Nomal idler; (b) stuck; (c) no bearing; (d) fracture