Abstract
Ultrasonic Time Reversal Mirror (TRM) is an original solution to detect small cracks in solids of any geometrical shape. This technique is self adaptative. It achieves in real time, a natural focusing process matched to the defect shape, to the geometry of the liquid-solid interface and to the caracteristics of the propagation medium. In highly scattering media, the detection of small cracks is usually difficult due to the speckle noise. It is shown that TRM process allows a new approach of speckle noise reduction: TRM behaves differently if the signals come from an echographic speckle noise or from a defect. Using this property of TRM process, we developed an original signal processing that allows to distinguish, during the inspection, a high level speckle noise zone from a defect zone
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