Mapping Voids, Debonding, Delaminations, Moisture, and Other Defects Behind or Within Tunnel Linings (2013) / Chapter Skim
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Pages 38-40
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38 a p p e N D I x D accuracy The ultrasonic tomography (UST) system used in this study is a device with an array of ultrasonic transducers that transmit and receive acoustic stress waves for the inspection of concrete structures.
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From page 39... ...
39 Concrete Slabs with Blind Calibration The two UST systems have been demonstrated to locate 8-in.-deep air- and water-filled voids with a 0.51-in. precision and 2-in.-deep to 3-in.-deep delamination with a 0.55-in.
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From page 40... ...
40 Testing Equipment User's Manual. Limitations include the following: • The speed of data acquisition is low (0.8 to 2.3 min/sq ft)
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