Method and apparatus for acoustic examination using time...

Details Method and apparatus for acoustic examination using time... Method and apparatus for acoustic examination using time...

G - Physics

01

N

G01N 29/00 (2006.01) G01S 7/52 (2006.01) G10K 11/34 (2006.01)

Patent

CA 2107525

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 said 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.

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