Measuring and testing – Vibration – By mechanical waves
Patent
1993-09-24
1995-07-04
Williams, Hezron E.
Measuring and testing
Vibration
By mechanical waves
73602, 73599, G01N 2900
Patent
active
054289998
ABSTRACT:
A method for acoustic examination of a medium and detection of reflective targets includes a preliminary step of injecting a divergent sound beam into the medium from at least one transducer. Then the echo signals reflected by the medium and received by several transducers in an array are picked up. A time gate is used to select echoes coming from a particular zone of the medium. The echoes are stored, time-reversed and re-emitted. The signals newly reflected by the medium are stored and the time-reversal operation is repeated. After a final time reversal of rank 2n+1 (where n is a positive non-zero integer) over the full depth of the measurement time gate, the characteristics of the wavefront passing closest to the maxima of the signals are determined, advantageously in the form of a time distribution of the maxima. The characteristics can often be approximated with a polynomial law. An apparatus is disclosed for implementing the method.
REFERENCES:
patent: 4456982 (1984-06-01), Tournois
patent: 4463608 (1984-08-01), Takeuchi et al.
patent: 5092336 (1992-03-01), Fink
IEEE Transactions on UFFC, vol. 39, No. 5, Sep. 1992, N.Y. U.S. pp. 555-566-M. Fink "Time reversal principles" Alinea III; Fig. 5 Alinea V; Fig. 8.
Journal of the Acoustical Society of America, vol. 90, No. 2, Aug. 1991, N.Y. U.S. pp. 1119-1129-C. Prada et al. "The iterative time reversal mirror: A solution to self-focussing in the pulse echo mode"-Alinea D-Alinea E.
Kwok Helen C.
Universite Paris VII
Williams Hezron E.
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