Fig. 1. Overall structure diagram of DAS system

Fig. 2. Schematic diagram of laser demodulation process

Fig. 3. Schematic diagram of SVM dividing two-dimensional vectors

Fig. 4. Schematic diagram of SVM dividing three-dimensional vectors

Fig. 5. Schematic diagram of optical cable laying in GIS metal shell

Fig. 6. Real-time monitoring waterfall of DAS system

Fig. 7. GIS metal shell real-time vibration event classification signal waterfall diagram