Automatic fire extinguishing system for tunnels based on intrinsic safety fiber optic temperature measurement host

In order to cope with frequent fire disasters in coal mines, our research group has designed an automatic fire extinguishing system based on a distributed fiber optic temperature measurement host (hereinafter referred to as the temperature measurement host), which is used to sense the environmental temperature of the underground work area, predict the occurrence of fire disasters, control valve linkage for fire extinguishing, and ensure the environmental safety of the work area. The temperature measurement host motherboard is designed based on intrinsic safety principles and can be placed in flammable and explosive gas environments such as gas, hydrogen sulfide, and carbon monoxide. The host is independently powered by two intrinsic safety power supplies. The measured temperature measurement host has a standard temperature sensing length of ≤ 0.4m and a temperature measurement error of ±1°C. At present, the fire extinguishing system has been applied in the goaf and belt conveyor areas under the mine.