Debris Flow Detection System Based on Tree-Topology Optical Fiber Network

Area of Science:

• Geosciences
• Optical Engineering
• Sensor Technology

Background:

• Debris flows pose significant natural hazards.
• Existing detection systems often lack robustness and scalability.
• There is a need for passive, reliable debris flow monitoring solutions.

Purpose of the Study:

• To propose and demonstrate a debris flow detection system using an optical fiber network.
• To develop a passive and robust sensor network for real-time debris flow monitoring.
• To evaluate the system's performance through laboratory simulations.

Main Methods:

• Utilized optical communication devices: distributed feedback laser, fiber amplifier, amplified photodetector.
• Implemented a tree topology fiber network with optical couplers and delay fibers.
• Employed fiber patch cables or mirrors as sensor heads, replacing electric cables.
• Applied time-division multiplexing for simultaneous sensor monitoring.

Main Results:

• Successfully demonstrated a passive and robust sensor network for debris flow detection.
• Laboratory-level simulation experiments validated the system's effectiveness.
• Presented results for a five-stage tree topology network.
• Outlined the extensibility to a seven-stage network.

Conclusions:

• The proposed optical fiber network system offers a viable solution for debris flow detection.
• The passive and robust nature of the system enhances its reliability in hazardous environments.
• The modular and scalable design allows for adaptation to various monitoring scenarios.