Ultrasonic Imaging in Asphalt Pavement Using Low-frequency Array Transducer

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  • 低周波アレイ探触子を用いたアスファルト舗装内部の超音波映像化
  • テイシュウハ アレイタンショクコ オ モチイタ アスファルト ホソウ ナイブ ノ チョウオンパ エイゾウカ

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Abstract

<p>A post-processing array imaging method using full waveforms sampling and processing (FSAP) has been proposed in ultrasonic non-destructive testing. This makes use of scattered waves, measured by two-element combinations as a transmitter and a receiver, to synthesize high amplitude beams for any points in an inspection area. In this study, the FSAP method was applied to the inspection of asphalt pavement. Here, we considered the two-dimensional imaging using an ultrasonic array transducer with 75kHz center frequency, which was designed based on a simulation for the radiated wave field. Since the asphalt pavement has multi-layer structures, the FSAP algorithm needs to be modified to select an appropriate beam path due to the diffraction of the ultrasonic wave at the interface. We validated the performance of the proposed methods by measuring the longitudinal scattered waves in asphalt specimens. Artificial defects at the layer interface and the base material were clearly reconstructed in real-time using graphic processing unit computing.</p>

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