After deriving the propagation formula of stress wave through incident bar, the measured
signals both in horizontal impact test and drop impact tests are investigated with novel fiber Bragg
grating sensors(FBGs). Especially those strain signals from FBGs which mounted on the surface of an
incident bar are studied. The signals in impactor and the FBGs embedded in the composite material
under similar test condition are compared. The dropping and impacting models have been setup. The
experiment data measured in a lab are analyzed both in time-domain and in frequency domain. Those
ultra-high frequency components in the above strain signals can not be obtained by current FBG
measurement system due to frequency limit of the demodulation system. Further study to improve the
frequency of demodulation system will be done in next step.
Strain measurements using Fiber Bragg Grating sensors in Structural Health Monitoring
