A Modified Time Reversal Method for Guided Wave Detection of Bolt Loosening in Simulated Thermal Protection System Panels

Figure 7

Input/output signals of the time reversal process: (a) the tone burst input, (b) response signal due to the tone burst input, (c) the time-reversed reemitting signal, and (d) the reconstructed signal received at healthy structure.

(a)

(b)

(c)

(d)