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JST Press Release

December 23, 2016
Japan Science and Technology Agency (JST)
5-3, Yonbancho, Chiyoda-ku, Tokyo 102-8666

Development of in situ, nondestructive inspection technique of the internal deformation of a black rubber by terahertz polarization spectroscopy

Associate Professor Shinichi Watanabe and Assistant Professor Makoto Okano (Department of Physics, Faculty of Science and Technology, Keio University) succeeded in developing the nondestructive inspection technique of a black rubber with a high-speed and accurate terahertz polarization measurement system. It has been difficult to observe the internal state of the black rubbers including carbon black particles that act as a reinforcing filler by using visible, near-infrared, and mid-infrared light. This innovative achievement was based on the high transmissivity of terahertz waves through the black rubbers, and their polarization information can be used to estimate the internal anisotropy, which is closely linked to the internal deformations. This method is expected as a novel nondestructive testing tool of tires and rubber vibration isolators.

Program Information

Collaborative Research Based on Industrial Demand
Research Area “Terahertz-wave: Towards Innovative Development of Terahertz-wave Technologies and Applications”

Journal Information

Makoto Okano and Shinichi Watanabe. “Anisotropic optical response of optically opaque elastomers with conductive fillers as revealed by terahertz polarization spectroscopy”. Scientific Reports 6, Published online 23 December 2016, doi: 10.1038/srep39079


[About Research]
Shinichi Watanabe, Ph. D.
Associate Professor, Department of Physics,Faculty of Science and Technology, Keio University
URL: http://www.phys.keio.ac.jp/guidance/labs/watanabe/english/index_e.html

[About Program]
Hisashi Hayashibe
Department of Industrial-Academic Alliance, JST


JST, an integrated organization of science and technology in Japan, establishes an infrastructure for the entire process from the creation of knowledge to the return to the society. For more information, visit http://www.jst.go.jp/EN/