A nondestructive inspection method for black rubber using polarization-sensitive terahertz spectroscopy and its application
Shinichi WATANABE1, Makoto OKANO1
We introduce polarization-sensitive (PS) terahertz spectroscopy as a novel tool for non-destructive inspection of black rubber. The PS terahertz optical response of black rubber is mostly determined by the concentration and orientation of the carbon black fillers inside the sample. Therefore, PS terahertz spectroscopy allows access to filler information inside the material. In addition, we can quantitatively estimate the internal strain of the sample through the filler-orientation information. Our analysis model based on a mixture of the polymer matrix and fillers can be applied not only to black rubber but also general polymer composite materials. Recently, rubber and polymer composite materials are widely used in our daily life, so our novel nondestructive inspection method is useful to test such materials.
- 1 Department of Physics, Faculty of Science and Technology, Keio University