Measurement of Moisture Content of Coal Based on Standing-wave Ratio

A method of measuring moisture content of coal based on standing-wave ratio was put forward. Because the permittivity of coal was also influenced by the temperature and degree of compaction of coal, and there was a complicated nonlinear relationship among the moisture content of coal, permittivity, temperature and degree of compaction, the least squares support vector machine was used to build the measurement model of moisture content of coal. The results show that the method is feasible, and the model using least squares support vector machine has better measurement accuracy and generalization ability than the model by partial least-squares regression based on cubic spline function.