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1 August 2003 Development of a new fiber optic vibration sensor and its application to structural health monitoring of composite structures
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A new fiber-optic vibration sensor has been developed and applied to structural health monitoring. The sensor is based on new finding that frequency of light wave transmitted through an bended optical fiber is shifted by vibration at the bended region. The principle can be explained that Doppler's effect of the light wave which changes its direction in the optical fiber. Several configurations of the sensor have been designed, and very high sensitivity has been achieved in the extremely wide frequency band by applying laser Doppler velocimetory. Practically numberless sensing points can be arranged on a single optical fiber, and regional monitoring which covers large area of the structures can be achieved. The performance of the sensor is examined experimentally by applying to detection of AE signals and elastic wave propagation in the composite material and adhesive joint test specimens. The experimental results show that the sensitivity is almost equivalent to PZT sensor and that failure of composite materials and debonding in the adhesive joint can be detected successfully. The durable, low-cost and high-sensitive sensor can show a new scope to structural health monitoring in the very variety of applications, for examples, composite aerospace structures, energy plants, piping system, infrastructures such as bridges and tunnels, surface and underground facilities. University and industry collaboration initiated a new business of new NDE for health monitoring and diagnostics.
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Kazuro Kageyama, Isamu Ohsawa, Makoto Kanai, Yuichi Machijima, Humio Matsumura, and Keiichi Nagata "Development of a new fiber optic vibration sensor and its application to structural health monitoring of composite structures", Proc. SPIE 5046, Nondestructive Evaluation and Health Monitoring of Aerospace Materials and Composites II, (1 August 2003);

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