Detection and imaging in complex media with the D.O.R.T. method

The D.O.R.T. method is an appropriate method to detect defects in complex and noisy solid samples. This method applies to any type of transducer array and linear waves. It is an efficient mean to separate the echo of a defect from the microstructure contribution or from another defect. The detection of defects in titanium alloy containing grain structure are shown. Results illustrating the detection at 5 MHz of flat bottom holes (FBH) with different diameters located at 140 mm depth in a titanium alloy sample are shown. Then we show that this method applies to imaging with Lamb waves. The detection of 0.6 and 0.8 mm holes in a 1 mm thick duralumin plate is presented.