New Developments and Applications of Coal Mine Pressure and Force Monitoring Technology

Some new techniques used to improve the characteristics of vibrating-wire sensor and their applications in coal mine pressure and force monitoring are summarized. First, the new mathematical model and its applications are given. Second, the match of wire and diaphragm for the horizontal wire type sensor to reduce the hysteretic of the sensor is presented. Third, the weak excitation of the wire is stated which can effectively solve the problem of frequency variations. At last, the techniques of piston-conveying pressure and force conversion can be used to improve the accuracy and long-term stability, and to design the wide range、 high accuracy、high resolution and long-term stable pressure sensors and force sensors.