Abstract: With the continuous progress and development of science and technology, more and more new composite components were used in the industrial manufacturing process. However, composite materials during service once the damage will lead to huge losses, so it is very important for structural health monitoring of composite materials. Fiber Bragg grating (FBG) sensor technology was used in the detection of glass fiber composite sheet. Incentive on glass fiber composite using active impact way, and collecting impulse response signal before and after the injury. We have studied the impact response of the damage identification which is based on the wavelet packet energy spectrum, by wavelet packet decomposition, obtained the histogram of wavelet energy spectrum changes ratio before and after the injury. Compare each order wavelet packet energy ratio; we realize the damage identification of the glass fiber composite.

Key words: optoelectronics, fiber Bragg grating, impulse response, composites, wavelet packet energy spectrum