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In this work we have measured the time reversal invariants of dielectric cylinders for different Tx and Rx arrays. The results have been interpreted in terms of normal modes decomposition of the scattered field. We use this approach to find out some cylinder parameters such as location, radius, and permittivity. To this purpose, we have developed an inverse method based on the decomposition of the...
We study also the amplitude peak with respect to other parameters such as : the number of antennas of the TRM, the pulse length (bandwidth), the polarization. We also focus on the TR when only a window of the transient response is time flipped. The combination of TR technique and reverberant chamber leads to make a high amplitude pulse generator from a low power arbitrary waveform generator. The potential...
Brain treatment with High Intensity Focused Ultrasound (HIFU) can be achieved by multichannel arrays through the skull using time-reversal focusing. Such a method requires a reference signal either sent by a real source embedded in brain tissues or computed from a virtual source, using the acoustic properties of the skull deduced from CT images. This non-invasive computational method allows precise...
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