Mine alarm system based on fiber bragg grating sensing

Abstract

The invention relates to a mine alarm system based on fiber bragg grating sensing, belonging to the field of alarm technologies. The mine alarm system comprises a 980nm pumping source, an optical switch, fiber bragg gratings and the like, wherein the 980 nm pumping source is connected with a WDM (Wavelength Division Multiplexer), the WDM is connected with an Erbium fiber, the Erbium fiber is connected with an isolator, the isolator is connected to a 1*2 coupler, the output end of the 1*2 coupler is connected with the optical switch, the other end of the 1*2 coupler is connected with a wavelength demodulator, the optical switch has 4-8 output ends, each output end of the optical switch is connected with 18 fiber bragg gratings which are connected in series, and each fiber bragg grating is packaged with a copper sheet and marked with a number and has a respective fixed position. When the copper sheet packaging one fiber bragg grating is pressed down, the corresponding fiber bragg grating generates strain and optical wavelength changes to cause alarm. The mine alarm system has the advantages of radiation resistance, corrosion resistance, electromagnetic interference resistance and multiple measurement points; in addition, a sensing probe has simple structure and small size, is convenient to install, achieves higher accuracy, sensitivity and short response time, can obtain alarm signals in time to win rescue time.

Description

technical field [0001] The invention relates to a mine alarm system, in particular to a mine alarm system based on optical fiber grating sensing, which belongs to the technical field of mine alarm. Background technique [0002] There are two main methods of mining coal. One is underground mining and the other is open pit mining. For deeply buried coal, the method of underground mining is generally adopted. Compared with open-pit mining, its special operating characteristics are: poor working environment, small space; changeable geological conditions, often affected by fire, water, gas, coal, etc. The threat of disasters such as dust and roof; the production process is complex and labor-intensive. [0003] my country is the world's largest coal-producing country, and most coal mining is underground mining. According to statistics, in 2004, my country's total coal production was 1.66 billion tons, accounting for 33.2% of the world's total, but the number of deaths in mining ...

AI Technical Summary

Problems solved by technology

For deeply buried coal, underground mining is generally adopted. Compared with open-pit mining, its special operating characteristics are: poor working environment, small space; changeable geological conditions, often affected by fire, water, gas, coal, etc. The threat of disasters such as dust and roof; the production process is complex and labor-intensive, etc.

Images