Devices, Systems and Methods of Detecting Defects in Workpieces

摘要

A method of detecting a defect in a workpiece includes inputting into the workpiece at least two signals at respective frequencies F1 and F2 to create vibrations in the workpiece. The resultant output is detected at another location on the workpiece with wideband receiver. One or more of the resultant harmonics, overtones or sidebands are monitored to determine the presence or absence of a defect. The at least two frequencies F1 and F2 are inputted simultaneously by a single transmitter.