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| Advanced Composite Materials and Fiber-Optic Structural Health Monitoring |
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Kageyama Kazuro, Prof., Department of Environmental and Ocean Engineering, School of Engineering My study theme is about advanced composite materials, smart material and structure systems, structural health monitoring and non-destructive inspection. After finishing the graduate school, I entered a study about carbon fiber reinforced plastics (CFRP) in Mechanical Engineering Laboratory, Agency of Industrial Science and Technology, Ministry of International Trade and Industry. After my service of research official, I move to Department of Naval Architecture, The University of Tokyo. Before I joined to the department, I didn't study ship, so I got boat license so that I had my own ship, coming to enjoy it as a hobby. We installed optical fiber sensors to the yacht structure to collect data of safety or reliability in 1999, when "Nippon Challenge" participated in the race (Luis Vinton cup), pre-champion series for the famous "America's cup". Presently I'm working for CFRP(Carbon fiber reinforced plastic) that is available for re-cycle or re-use; also is friendly to the surroundings. CFRP has a bottle-neck in processability and cost compared with metal available in the automobile industry, However I hope you could get your car lighter and less energy- consumed if we overcome bottle-neck of composite materials in the future . I'm engaged in developing optical fiber as a study of structural monitoring. It was an accident. One of my students found a fact that displacement rate normal to the small segment of bent optical fiber effects on the frequency shift of light transmitted through the optical fiber and that the intensity of the frequency shift is proportional to the curvature of the bent fiber. It came from a principle "Doppler effect in flexible and expandable light-waveguide". We developed it to vibration and acoustics sensor of optical fiber. It took 4 years to get to the mechanism but in the mean time we applied the patents to set up a venture. Now we're managing cooperative researches. Optical fiber is extremely durable, heat and corrosion-resistant as well as flexible and fine. It's good for sensor. We used it and developed a sensor with numbers of functions for vibration, noise, sound, ultrasonic on it. The sensor is highly sensitive and immune to microwave. If you set it on structures or machines you can measure tens kilometers away or monitor in a long term. Its application may expand to civil engineering, aerospace, railroad, road, chemical and energy plant or security. We're making it forward that we impart these sensors into structures as a neuronic network so that the structures themselves sense damages happening within. |
Department of Technology Management for Innovation (TMI) was launched in the Graduate School of Engineering in April 2006. Since its preparation stage, I've been associated with it. Now that science technology and social system is being complicated, more people in the engineering field are needed to be not just with the knowledge of scientific technology but also management ability. That's why students should learn business-modeling strategy, R&D management or system theory in the course. The course has such program based on inter-academics for selected members; and helps more students become not single-majored but multi-majored. Some will graduate from the course next March. I want to see how they will play their roles. I also want to put my work into making the net-work of the graduates. |
When I look back, I think my study has been made forward naturally while enjoying the subject given by senior professors or even by the management, rather than I have been trying to look for theme myself. I think I can get my brain activated while exercising like cycling or walking with a dog, and sometimes get good ideas to come up with me. I can calculate 5 to 6 lines of formulas and often plot sentences while walking. As a resident of Ushiku City, I sometimes go to the mountains or go hiking if things permitted. I've been attending the aerobics class in the city since last year. It is pleasant for me to use my muscles that I don't use usually. I used to do astronomical observation as my childhood, and now I enjoy it for relaxation sometimes. |
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Optical fiber- vibration and sound sensor and its system  The sensor is based on a new finding that frequency of light wave transmitted through a bent optical fiber is shifted by vibration at the bent region. The phenomenon can be explained as Doppler's effect in flexible and expandable light-waveguide. |
<Personal Background>1981:Doctor of Engineering of Marine Mechanics Dep. of Tokyo Univ. Employed at National Institute of Advanced Industrial Science and Technology, researches the value of advanced compound materials. 1985:Guest researcher of US Delaware Univ. 1988:Evaluates structural design and materials of ultra-light ships as assistant prof. of Dep. of Eng. of Tokyo Univ. 94กม95:Guest researcher of US Stanford Univ. 97:Prof. of Dep. of eng. research of postgraduate course of Tokyo Univ. Majored in structure of intellectual materials and structural health monitoring. |
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