System and method for detecting fire event in underground utility tunnels based on acoustics

A system for early detection of fire situations in an underground facility based on sound, the system comprising:

• a sound acquisition device that is installed in the underground facility and collects acoustic signals in real time;
• and
• a fire situation early detection server that predicts occurrence of electric sparks and infers a fire risk based on the acoustic signal collected by the sound acquisition device,
• wherein the fire situation early detection server includes:
• an audio receiving unit configured to receive the acoustic signals collected from the sound acquisition device;
• a preprocessing unit configured to divide the received acoustic signals into a plurality of frames and obtain a spectrogram for each of the plurality of frames;
• a fire sound analysis unit configured to extract noise-removed data from the obtained spectrogram;
• a pre-fire situation detection unit configured to predict a probability of electric spark occurrence based on the extracted data;
• and
• a fire risk inference unit configured to infer the fire risk by combining the predicted probabilities of electric spark occurrence in each frame.