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Air-coupled ultrasound as an accurate and reproducible method for bonding assessment of glued timber

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Figure

Table 1 Description of glued timber samples manufactured for ACU measurement Type Description
Fig. 2 Main propagation paths and typical A-scans. 1 and 2 are waves propagating through the sample.
Figure 3 demonstrates successful ultrasonic imaging of absence and presence of adhesive
Fig. 4 Profile of peak voltage level for a typical C-sample measured with a time gate of 860–930 ls;
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