As the main energy of industrial production in China, coal mine has an incomparable position with other energy sources. The safety production of coal mine has been put in the first place of coal mine production. With the continuous mining and extension of the mine, the goaf has become one of the important dangerous sources in the coal mine. Especially once the goaf is ignited, it is impossible to detect and locate the ignition point, which brings difficulties to rescue and even causes gas and coal dust explosion. Therefore, the safety monitoring in goaf is of great significance to reduce the loss of life and property.

• The sensor is optical fiber, without power supply, intrinsically safe!

• Optical fiber is used as both sensor and transmission medium, so the system structure is simple;

• Optical fiber has the characteristics of electrical insulation, intrinsic safety and anti electromagnetic interference;

• It can realize long-distance and large-scale distributed continuous real-time temperature monitoring, especially suitable for long-distance and large-scale applications; it can accurately measure the temperature value of any point along the optical fiber without measuring blind area, which is not only large in information but also intuitive in effect;

• It can measure the temperature change of the measured object sensitively and provide the ability of early detection of abnormal hot spot;

• The material of optical fiber core is silica, and the optical fiber sensor is corrosion resistant and has long service life;

• Optical fiber has good flexibility and flexible installation position, which can meet the needs of different installation positions in different projects;

• High reliability, high sensitivity and high precision.

• Using advanced optical pulse control and detection technology, high spatial resolution;

• The integrated functional devices and optical modules of carrier level are compact in structure;

• Embedded control and equipment status self diagnosis;

• Low power consumption, hot swap design;

• Wide temperature range without drift;

• High reliability;

• Bluetooth communication;