Study And Application Of Magnetic Sensor Array Structures In The Advanced Detection System Of Underground Coal Mine

The coal mine water disaster not only influences the coal mine safety production,but also threatens the lives and safety of miners.Therefore,it is very important to carry out the advanced detection technology of coal mine water damage.In recent years,TEM based on the semi-space have many characteristics which are high resolution,strong direction and sensitive to low resistance area,it has been widely used in coal mine.However,due to small underground space and low resistance interference,the application of TEM in the coal mine is limited.Moreover,in theory,there are many problems about basic theory and data processing methods to be solved.In this dissertation,the detection system of coal mine water hazard based on magnetic sensor array is designed.The receiving system of TEM is debugged and improved.The data processing system are optimized.The main research work is as follows:(1)By using the magnetic induction probe instead of the traditional receiving coil,the sensitivity of the transient electromagnetic secondary field is improved,through the detection in the mine roads,the magnetic probe can achieve the traditional coil detection effect,it can get better detection effect.(2)The multi-channel data acquisition system is designed.The characteristics of the transient electromagnetic signal in different periods are adopted.The four channels of different magnification are used to synchronize the data of the different stages.The data of the different stages are intercepted.Normalized processing and interception,improve the accuracy of the acquisition of advanced signals.(3)Through the PC software to control the receiving system,it has a good human-computer interface,complete display and other features.After receiving the data,the system can collect the linear coordinate display and logarithmic coordinate display of the waveform of the collected signal.At last,multi-channel array acquisition system of the magnetic induction probe was tested by using the transient electromagnetic detection experiment in the working face of several water areas in Sitai mine,Tashan mine and Jingfang mine.The system is verified by the analysis of the experimental results.