T.O. 33B-1-15-745.4.5.3 RingingMethod.Figure 5-73 shows the principle of this method. The A-scans in the figure represent the outline of multiple echosignals from the skin that cannot be individually resolved. This method is most sensitive to unbonds between a singlelayer of skin and the adhesive layer. An unbond between the adhesive and the core or another layer of skin or a doublerwill often not produce a ringing signal, because the adhesive bonded to the top sheet dampens the signal. Because ofthis limitation, it is recommended that this method be applied only when one of the other methods is not applicable. Agood application for this method is the inspection of core-to-closure-member bonds.Figure 5-73. Ringing Method.
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