Fig. 6From: Automated Surface Wave Measurements for Evaluating the Depth of Surface-Breaking Cracks in ConcreteTypical signals generated by the surface-mount piezoelectric transducers, measured using accelerometers across a surface breaking crack with a depth of 20 mm in the specimen 1: a time signals, b, c the modulus and phase angle of the transmission functions (SAC/SAB or SDB/SDC).Back to article page