Ultrasonic Testing Analysis of Concrete Structure Based on S Transform

Figure 9

Time-domain ultrasonic signals in five cases: (a) intact concrete; (b) square hole depth 100 mm; (c) square hole depth 200 mm; (d) square hole depth 300 mm; (e) square hole depth 400 mm.

(a)

(b)

(c)

(d)

(e)