Measuring and testing – Vibration – By mechanical waves
Patent
1992-05-27
1994-04-19
Williams, Hezron E.
Measuring and testing
Vibration
By mechanical waves
73602, 73620, 73629, G01N 2906, G01N 2908, G01N 2910
Patent
active
053035909
ABSTRACT:
A method of an apparatus for ultrasonic inspection of multi-layered structures having acoustic transmission (I, III, V and VII) and reflection (II, IV, VI and VIII) frequency bands. Variations in one or more parameters of specific layers are largely restricted to specific frequency bands of said layers. By analyzing transmitted or reflected signals with respect to the frequency bands of the structure, interpretation of signals due to parameter variations as caused by voids, inclusions or delaminations can be effectively eliminated. The method is preferably used for the inspection of laminated structures consisting of metal layers bonded by fibre reinforced resin layers.
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"Principles and Application of Ultrasonic Spectroscopy in NDE of Adhesive Bonds" by F. H. Chang, P. L. Flynn, D. E. Gordon, and J. R. Bell; IEEE Transactions on Sonics and Ultrasonics, vol. SU-23, No. 5, Sep. 1976 (pp. 334-338).
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Modderman Theodorus M.
Pronker Wiebe F.
Finley Rose M.
Fokker Aircraft B.V.
Williams Hezron E.
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