Imaging system of internal flaws and inclusions in concrete material using ultrasonic and electromagnetic array probes
Japan Society for the Promotion of Science:Grants-in-Aid for Scientific Research
Date (from‐to) : 2010 -2012
Author : NAKAHATA Kazuyuki; OKAZAKI Shin-ichiro
In this research, a novel nondestructive imaging method in concrete material was developed by means of both ultrasonic and electromagnetic waves. Here, we proposed a phased array imaging technique which makes use of scattered waves of ultrasonic and electromagnetic waves, measured by every two-element combination as a pulser and a receiver, to synthesize high amplitude beams for any points in an inspection area. To validate this full-waveforms sampling and processing (FSAP), the numerical simulation based on the finite integration technique (FIT) and experimental measurement of ultrasonic and electromagnetic waves were performed. Using the FSAP technique, we demonstrated shape reconstructions of internal voids and corrosion parts of reinforced steel bars in concrete specimens. Furthermore, a computation method with a graphics processing unit (GPU) was introduced to execute the FSAP at high speed. We integrated our imaging method into a platform, and showed a prototype of aportable nondestructive imaging system.