High-frequency Total Focusing Method (TFM) imaging in strongly attenuating materials with the decomposition of the time reversal operator associated with orthogonal coded excitations | Zendy

Eduardo Lopez Villaverde | Zendy; Sébastien Robert | Zendy; Claire Prada | Zendy

Open Access

High-frequency Total Focusing Method (TFM) imaging in strongly attenuating materials with the decomposition of the time reversal operator associated with orthogonal coded excitations

Author(s) -

Eduardo Lopez Villaverde,

Sébastien Robert,

Claire Prada

Publication year - 2017

Publication title -

aip conference proceedings

Language(s) - English

Resource type - Conference proceedings

eISSN - 1551-7616

pISSN - 0094-243X

DOI - 10.1063/1.4974589

Subject(s) - hadamard transform , operator (biology) , attenuation , noise (video) , high density polyethylene , acoustics , signal to noise ratio (imaging) , computer science , algorithm , materials science , image (mathematics) , optics , mathematics , physics , computer vision , telecommunications , mathematical analysis , polyethylene , biochemistry , chemistry , repressor , composite material , transcription factor , gene

In the present work, the Total Focusing Method (TFM) is used to image defects in a High Density Polyethylene (HDPE) pipe. The viscoelastic attenuation of this material corrupts the images with a high electronic noise. In order to improve the image quality, the Decomposition of the Time Reversal Operator (DORT) filtering is combined with spatial Walsh-Hadamard coded transmissions before calculating the images. Experiments on a complex HDPE joint demonstrate that this method improves the signal-to-noise ratio by more than 40 dB in comparison with the conventional TFM.

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