Abstract:In order to .measure the dynamic strain in concrete during impact or explosive test, a fiber Bragg grating (FBG) sensor special designed for inner strain measurement in concrete was developed. The concrete specimens in which the FBG sensors were embedded were prepared and tested under impact in split Hopkinson pressure bar (SHPB). The inner and surface strains were measured by FBG sensors and strain gauges separately and an attempt to construct the dynamic relationship between stress and strain with the data was made. The analyses to the results show that the method of strain measurement in concrete with embedded FBG sensors is feasible and more reasonable if accurate strains and exact performance of concrete are demanded. The FBG sensors were proved to be suitable for dynamic strain measurement in concrete and can be widely used in concrete and rock during their dynamic performance tests and response measurement under impact or explosive loads.