DIGITAL DECONVOLUTION ANALYSIS OF ULTRASONIC SIGNALS INFLUENCED BY THE PRESENCE OF LONGITUDINALLY ALIGNED STEEL CABLES IN PRESTRESSED CONCRETE

Several experiments are described in which ultrasonic signals were transmitted and received through concrete containing steel rods and cables. Details of how the signals were processed to extract information relating to the condition of the steel itself are presented. In particular, the method of deconvolution is employed in a manner which allows the impulse response and frequency response of the embedded steel alone to be uniquely isolated from the effects of the surrounding concrete, whilst still allowing the transducers to be mounted on the surface of the concrete.