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Tunnel fires are not common but they can cause a great damage to lives and properties if happen. Detecting the presence of a fire inside the lengthy and curved tunnel is a tedious process. Detection using Fiber Bragg Grating (FBG) Sensor technique provides a novel methodology by finding not only the presence but also locating the fire inside the tunnel. FBG Sensors are distributed across the inner sides of the tunnel and they are monitored by the Optical Spectrum Analyser (OSA) or Wavelength Division Multiplexing (WDM)Sensor Interrogator at the exit. The change in the center wavelength from the original spectrum at the output denotes the temperature change (fire occurrence) inside the tunnel. The FBG provides output with more accuracy and it can withstand very high temperature values. Keywords— Center wavelength, Fiber Bragg Grating Sensor, Optical Spectrum Analyser, Tunnel Fire, WDM Sensor Interrogator.

Tunnel Fire Detection using FBG