The Boundary Element Method of Testing Wood Moisture Content Problem in the Heterogeneous and Asymmetric Case

Abstract

In this paper, we discussed this engineering problem that used planar capacitance sensor measuring lumber moisture content. And a new mathematical model was introduced which could set up the relationship between the distribution of dielectric constant and planar capacitance sensor in the heterogeneous asymmetric cases. At the same time, the numerical example was given and we matched the function of capacitance value and dielectric permittivity of medium. Accordingly, through measuring capacitance value of capacitance sensor, we could get the distribution situation of dielectric permittivity, thus obtaining the moisture content distribution of media such as wood. It could not only greatly cut down measuring work, but also avoided the waste of media resources, such as wood.