Method of and an apparatus for frequency selective ultrasonic in

Measuring and testing – Vibration – By mechanical waves

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73602, 73620, 73629, G01N 2906, G01N 2908, G01N 2910

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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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patent: 3485087 (1969-12-01), Brech
patent: 4215583 (1980-08-01), Botsco
patent: 4428235 (1984-01-01), Sugiyama
patent: 4457174 (1984-07-01), Bar-Cohen
patent: 4825423 (1989-04-01), Yamanaka
patent: 4953405 (1990-09-01), Hara
patent: 5088327 (1992-02-01), Gammell
"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).
"Ultrasonic scanning and spectrum analysis for inspection of bond efficiency of metal-to-metal structural adhesive joints" by G. Biggiero, G. Cannella, and A. Moschini (NDT International) Apr. 1983, pp. 67-73.
"Ultrasonic Procedures for Predicting Adhesive Bond Strength" by Joseph L. Rose and Paul A. Meyer (Materials Evaluation) Jun. 1973 pp. 109-114.

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