Measuring and testing – Vibration – By mechanical waves
Patent
1992-11-04
1995-07-11
Williams, Hezron E.
Measuring and testing
Vibration
By mechanical waves
73628, 73598, 73596, G01N 2906
Patent
active
054310539
ABSTRACT:
A method for internal inspection of pieces having an interface with a propagation medium, is described. The steps include: illuminating a reference piece with an ultrasound beam from a first array of transducers excited by stored excitation signals; sensing reflected echo signals received by transducers, which may be the transducers of the first array, and storing the waveforms and time distribution thereof; simultaneously sensing refracted signals, received by transducers belonging to a second array placed opposite to the the first relative to the piece and storing the waveforms and time distribution of the signals received by the transducers of the second array; replacing the reference piece with a piece to be inspected having the same shape and occupying the same location, and applying, to each of the transducers, energization signals obtained by time reversal of the stored waveforms and time distribution; and sensing the signals received by the transducers of the second network.
REFERENCES:
patent: 4463608 (1984-08-01), Takeuchi et al.
patent: 5092336 (1992-03-01), Fink
Ashraf Nashmiya
Universite Paris VII
Williams Hezron E.
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