Abstract
The Total Focusing Method (TFM) was generalized about ten years ago to form images with complex ultrasound paths involving reflections and mode conversions at the interfaces of a testing sample. The resulting multi-mode imaging allows to fully image the face of a crack-type defect. More recently, the Plane Wave Imaging (PWI) was revisited to perform multi-mode reconstructions with a small number of transmissions compared to the TFM. In order to further accelerate the imaging process, we propose here to combine plane wave emissions with a fast reconstruction algorithm in the Fourier domain. The method was developed in medical imaging with the pioneering works of J.- Y. Lu, and was studied in a recent paper to form images in solids with direct reconstruction modes. In the present paper, the theory is extended to various reconstruction modes (half-skip and one-skip modes with/without mode conversions), and the imaging method is evaluated with experimental results in a sample featuring different planar defects. We show that the method provides multi-mode images equivalent to those computed with the time-domain PWI, while reducing the computation times by a factor up to 13.
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