ULTRASONIC DETECTION EQUIPMENT USING RESONANCE ANALYSIS AND ULTRASONIC DETECTION METHOD

摘要

PPROBLEM TO BE SOLVED: To detect the filling degree of the grout material in a sheath pipe embedded in concrete by the measurment from the surface of concrete. PSOLUTION: An analyzer 11 is constituted so as to obtain the addition average wave G(t) of a plurality of detection signals, to multiply the addition average wave G(t) by the np multiplication value (np: natural number) of a time series function TGC(t) being 1.0 (not attenuated) on and after a reference time tSBT/SBand below 1.0 (attenuated) before tSBT/SBto calculate GA(t)=äTGC(t)}SPnp/SPG(t) wave, to subject GAj(t) to Fourier transform to calculate a spectrum FAj(f), to standardize the spectrum FAj(f) so that the maximum spectrum value becomes 1.0 to calculate äFAj(f)}SPnp/SP, to display this in a superposed state to judge a spectrum wherein all of j=1-(ne+1) are drawn in an overlapped state as a reflected wave spectrum and to grasp the insufficiency of a filler in the sheath pipe when a spectrum, wherein a spectrum value is amplified, is obtained at each time when the value of j increases. PCOPYRIGHT: (C)2005,JPO&NCIPI