A new method for measuring the temperature-dependent dielectric constant of the PDMS fluids

A new method is described for measuring the temperature-dependent dielectric constant of the PDMS fluids by using a low cost MEMS sensor. The dielectric constant of the PDMS fluids is obtained by measuring the capacitance of a MEMS temperature sensor, which uses PDMS fluids as its sensitive material. Despite properties of the PDMS fluids in different temperature plays an important role in practical applications, few designs for measuring the relative static dielectric constant and the thermal expansion coefficient over different temperature have been developed. We construct a theoretical model which describes the behavior of the relative static dielectric constant and the thermal expansion coefficient over a certain range of temperatures. Preliminary experimental results show that the variation of the relative static dielectric constant and the thermal expansion coefficient versus temperature could be detected simply based on this method.