Journal
ULTRASONICS
Volume 111, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.ultras.2020.106301
Keywords
Transverse-to-transverse (T-T) double scattering; Strongly scattering material; Quasi-Monte Carlo; GPU acceleration
Funding
- National Key R&D Program of China [2017YFB1201302-13]
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A new transverse-to-transverse double scattering model (T-T DSR) is proposed in this work to more accurately model transverse ultrasonic backscatter, utilizing a quasi-Monte Carlo method and GPU acceleration for numerical computations. Experimental results demonstrate that the T-T DSR model outperforms the T-T SSR model in evaluating grain size of strongly scattering specimens.
Previously, a transverse-to-transverse single scattering model (T-T SSR) was developed for a pulse echo configuration, which may have limitations for strongly scattering materials. In this work, a transverse-to transverse double scattering model (T-T DSR) is presented to model the transverse ultrasonic backscatter more accurately. First, the Wigner distribution of the transducer beam pattern is extended to a transverse wave. Next, the multiple scattering framework is followed to derive the transverse and longitudinal components of the second-order scattering. Then, a quasi-Monte Carlo (QMC) method is used with Graphics Processing Unit (GPU) acceleration to calculate numerical results of the final expression which contains a five-dimensional integral. The correlation length, the focal length of the transducer, and incident angle are used to investigate differences between the T-T DSR model and the T-T SSR model. Finally, a backscatter experiment is performed on two stainless steel specimens with different grain sizes to determine the respective correlation lengths. The results show that the T-T DSR model has better performance over the T-T SSR model for evaluating the grain size of these relatively strongly-scattering specimens.
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