Abstract
The authors developed an ultrasonic wave propagation system using FBG sensors in the previous study. The purpose of this study is to extend the function of this system with an AWG filter as an FBG wavelength filter to detection of impact loads. First, tensile test was conducted to obtain the relation between the strain and the output from each port of the AWG filter. Then impact test was carried out, and inverse analysis was applied to the measured output ratio of multiple ports of the AWG using the fitted curves defined by the result of the tensile test. From the inverse analysis, the strain wave caused by the impact load was able to be obtained. Hence this system has an ability to detect impact behavior precisely through the inverse analysis
