Detection of silicone rubber content for composite insulators based on terahertz technology

Silicone rubber material is widely used in power grid system, and the rubber content in silicone rubber is an important factor to judge insulating materials. Too high or too low rubber content will affect the insulation and mechanical properties of materials. In this paper, terahertz non-destructive testing method is used to build a terahertz testing platform in the laboratory, and the absorption rate of silicone rubber samples is obtained by transmission testing. Through DFT calculation of the main components in silicone rubber at terahertz frequency, the absorption rate at terahertz frequency is simulated, and the comparison between the measured signal and the simulated signal shows that the rubber content has a good linear relationship with the absorption rate at 1.90thz frequency, and the rubber content in silicone rubber can be obtained by this frequency.