Development of fiber optic sensor and high power fiber laser

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Fiber optic sensor (FOS) has become more and more popular since it can perform unique functions that conventional sensors cannot. For example, an FOS can be embedded inside carbon fiber composite for fatigue tests or embedded in concrete bridges or dams for structural integrity tests. Due to the small size, FOS can be applied to places that are off-limits to other sensors, such as on the computer flip-chip Ball Grid Array substrate for qualification bending test, or on a catheter to measure bending radius. The purposes of this proposal are to develop specific FOSs for many important applications, including: i)FOS arrays for strain and bending measurement of steering artificial muscle catheter; ii)FOS for yield strength and tensile strength of friction stir welding alloy; iii) FOS arrays for detecting crack initiation and propagation of carbon fiber composite materials; and iv) FOS high speed impact test.