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| Development of innovative intellectual materials ―Monitoring technologies for ensuring human safety― |
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| Fiber-Optic Sensing |
 Kazuro Kageyama, ProfessorDepartment of Environmental and Ocean Engineering We found a new phenomena in optical fiber; "Doppler Effect in Flexible and Expandable Light Waveguide (DEFEW)". We and our company have developed a new fiber-optic vibration/acoustic sensor based on the principle. DEFEW sensor has very wide frequency range and extremely high sensitivity and applicable to structural health monitoring such as bridges, buildings, airplanes, underground structure, energy related plants, etc, by measuring and analyzing AE and vibrations. |
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| Structural Health Monitoring of Advanced Composite Structure System |
 Nobuo Takeda, ProfessorDepartment of Aeronautics and Astronautics Advanced composites have been extensively used especially in recent aerospace structures. For such applications, a structural health monitoring (SHM) system is highly required to detect the damage type, location and size, and to judge the structural integrity in real time. We have been developing a small-diameter optical fiber and its FBG (fiber Bragg grating) sensor which is 1/3 in diameter of a conventional optical fiber. Embedment into a CFRP composite structure and its impact damage monitoring were successfully shown in our composite fuselage demonstrator test. Further development is underway for real applications to next-generation civil aircraft. Moreover, CFRP structures and SHM system are also necessary in space structures, such as CFRP cryogenic tanks for reusable launch rockets and satellite structures. We have been providing some important academic contributions to the technological development with our unique ideas. |
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