Optical fiber sensor for mine safety Internet of things

For disadvantages of traditional electronic sensors in mine safety monitoring system such as low precision, poor reliability, a large amount of maintenance, monitoring dead-zone and so on, it was proposed that using optical fiber sensors and wireless sensor to build mine monitoring system of human, machine and environment with multi-dimension, multi-parameter and large capacity. Advantages of optical fiber sensor applications in the mine safety monitoring system were introduced. The operational principle of optical fiber sensors developed for mine applications were described, which included laser spectral analysis based gas sensors, fiber Bragg grating based physical sensors and distributed optical fiber temperature sensor. Meanwhile, typical applications of optical fiber sensors in mine safety Internet of things were introduced including laser methane sensor in coal mine safety monitoring system, optical fiber acceleration sensor in micro-seismic monitoring system and distributed optical fiber temperature sensor in goaf fire monitoring and pre-alarming system.