Abstract
This paper presents a double frequency conductivity measurement method for measuring mine bursting water, to solve the capacitance effect of the conductivity sensor itself has the help. The core controller of the system is the single chip microcomputer ATMEGA128. This paper introduces the basic principle of the measurement of the existing problems and the dual frequency measurement method, and then introduces and analyzes the hardware. To test and analyze the collected data, the double frequency method is found to have good stability and accuracy in the measurement of the electrical conductivity of mine inrush water. It is proved that the method and the system design of the hardware circuit can accurately measure the electric conductivity of the mine inrush water source.
Highlights
Mine flood is one of the major hazards in coal mine production safety, mine water inrush occurred suddenly, flooding tunnels quickly, causing economic dangerous, and can causing casualties, it is possible to real-time recognition of mine water inrush sources, grasp the characteristics of underground water, the safety in production of mine has important significance
Conductivity sensor measuring principle is to add certain voltage of two parallel plate electrodes into the solution to be measured in, in order to prevent the electrode polarization, usually has a high frequency AC voltage, through the current flowing between the measuring electrode to obtain conductivity
Taking into account the effect of capacitance, the use of dual frequency measurement method can be clearly seen that the compensation effect, there are errors, but the range is within ±70, require the measurement accuracy
Summary
Mine flood is one of the major hazards in coal mine production safety, mine water inrush occurred suddenly, flooding tunnels quickly, causing economic dangerous, and can causing casualties, it is possible to real-time recognition of mine water inrush sources, grasp the characteristics of underground water, the safety in production of mine has important significance. This design through the measurement of underground water conductivity to determine mine bursting water type and real-time control of water source changes, in order to solve the conductivity cell capacitance can not be measured. By using dual frequency determination method to determine the sensor resistance capacitance network charge and discharge time constant, so as to effectively eliminate the influence of distributed capacitance, improving the measurement accuracy of the system greatly [1]-[4]
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