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In recent years Distributed Point Source Method (DPSM) is being used for modelling various ultrasonic, electrostatic
and electromagnetic field modelling problems. In conventional DPSM several point sources are placed near the
transducer face, interface and anomaly boundaries. The ultrasonic or the electromagnetic field at any point is computed
by superimposing the contributions of different layers of point sources strategically placed. The conventional DPSM
modelling technique is modified in this paper so that the contributions of the point sources in the shadow region can be
removed from the calculations. For this purpose the conventional point sources that radiate in all directions are replaced
by Controlled Space Radiation (CSR) sources. CSR sources can take care of the shadow region problem to some extent.
Complete removal of the shadow region problem can be achieved by introducing artificial interfaces. Numerically
synthesized fields obtained by the conventional DPSM technique that does not give any special consideration to the
point sources in the shadow region and the proposed modified technique that nullifies the contributions of the point
sources in the shadow region are compared. One application of this research can be found in the improved modelling of
the real time ultrasonic non-destructive evaluation experiments.
Sourav Banerjee,Tribikram Kundu, andDominique Placko
"An improved DPSM technique for modelling ultrasonic fields in cracked solids", Proc. SPIE 6532, Health Monitoring of Structural and Biological Systems 2007, 65320R (24 April 2007); https://doi.org/10.1117/12.717230
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Sourav Banerjee, Tribikram Kundu, Dominique Placko, "An improved DPSM technique for modelling ultrasonic fields in cracked solids," Proc. SPIE 6532, Health Monitoring of Structural and Biological Systems 2007, 65320R (24 April 2007); https://doi.org/10.1117/12.717230