NACHWEISSYSTEM FUER MATERIALFEHLER

摘要

A structural defect detecting system is disclosed, which comprises vibration exciters 414 2 and vibration sensors 51-56 removably attached in a spaced arrangement to a construction 3 to be inspected and by which vibratory waves generated by the vibration exciters propagate through the construction and are detected by the vibration sensors. These are analyzed to detect a defect or fault in the construction. The vibration exciters are piezoelectric accelerometers, which are excited by pulsed signals generated by a vibration signal generator 1 and thus utilized as a vibration excitation source. The signal analysis components include a six channel amplifier 6, an eight channel data recorder 7, selectors 8a, 8b for selecting on-line or off-line mode and passing data to a fast fourier transform circuit 9, a controller 11 and a plotter 12. Applications to chemical plant and nuclear power plants are referred to. <IMAGE>