Dynamic Mode Sensing of a Composite Bean Using Fiber Bragg Grating Sensor

Fiber Bragg grating(FBG) sensor is a kind of the fiber optic sensor (FOS) and offers lots of advantages for structural health monitoring due to its multiplexing capability. Also, it is useful for the measurement of the structural vibration without mass concentration effect. For an accurate measurement of wavelength shift of FBG sensor, we developed a signal processing board with an electric circuit based on time-interval counting. This circuit board supplies tremendously the enhancement of the real-time signal processing program using LabVIEW software. To improve its multiplexing capability for large numbers of sensors, multi-channel sensor arrays with a wavelength-swept fiber laser(WSFL) are also constructed. This sensor system showed a good resolution of dynamic strain (