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Report No.

High speed inspection of the defect inside concrete by using laser technologies

Hasegawa, Noboru

In Japan, the deterioration of the infrastructure built in the high economic growth period (1954-1979) becomes big social problem. We have developed the inspection method of the defect in the concrete by using the laser technologies. We have succeeded to demonstrate the high-speed inspection of a mock-defect in concrete by using the high repetition rate impact laser and laser vibrograph. The repetition rate of inspection was improved to be 25 Hz. We commented about this measurement technique.



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