抄録
This paper presents a new impact identification method using the high-speed strain measurement system. This system consists of fiber Bragg grating (FBG) sensors and an arrayed waveguide gratings (AWG) filter, and can detect large strain waves such as the impact strain waves. Firstly, we propose new algorism for calculation of coordinates of the impact-loaded point. Although conventional detection methods are carried out under the condition that the propagation speed of the elastic wave is given, this proposed method enables us to calculate the position of a wave source without its speed. This algorism also has the great versatility of sensors positions. Next, the high-speed strain measurement system used in this study is mentioned. Using multiplexed FBG sensors, this system can detect the strain wave on four different points at the same time. Finally, the impact identification tests are carried out on the carbon Fiber reinforced plastic (CFRP) laminate. The aforementioned algorism are used to calculate the impact loaded position from the difference for the arrival times of the four sensor points. The results indicate the correct position with relatively small errors.
