Abstract
This paper Is devoted In developing a detection system for Interfacial defect between concrete and FRP sheet by using Laser Doppler Velocitometer. A piezoceramics is attached specimen's surface as an elastic-wave actuator. Through measurement of the elastic velocity-wave across the specimen and carbon fiber sheets by the LDV the Interfacial defect can be detected by comparing with the normal bond. It is concluded that detecting the position of the Interfacial between concrete surface and FRP sheets is effective, and the detection ability on area may be dependent on the capacity of the piezoceramic actuator. The detectability on surface area ceramics scope detected area is in a circle with 10cm-radius from the wave source point located on same face or the projecting point on the opposite face of wave source point through the piezoceramic actuator.
