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The localization of buried targets using Ground Penetrating Radar (GPR) is dealt with. The bi-static GPR is made of two identical Vivaldi antennas operating from 0.5 GHz to 3.5 GHz and installed in front of a sand box. The experimental data acquired in a controlled laboratory environment are validated by electromagnetic simulation. Then, both synthetic and experimental data are processed to detect...
Scanning using a strongly focused transducer gives a narrow focus depth and locally a high resolution. To obtain a high resolution at every point along the acoustic axis imaging is applied. Because the focal point can be considered as a second source, the wavefield can be split in its causal and anticausal parts. Imaging can be performed efficiently with a mapping algorithm in the wavenumber domain...
Based on two-way wave equation, prestack reverse time migration (RTM) overcomes dip limitation, and can image complicated geological body with high precision. However, since the massy storage, large amount of computation, low frequency noise, the industrialization process of this approach develops slowly. High order finite difference algorithm is used to calculate reverse time migration in the paper...
Handheld ground-penetrating radar (GPR) system is one of a number of technologies that has been researched as a means of improving landmine detection efficiency. However, as the measurement points are random and data are irregular for the human operator, it is difficult to display subsurface visualization imaging. Also detection of buried landmines by GPR normally suffers from very strong clutter...
There have hand-held GPR systems and vehicle-mounted GPR systems, which are offset from the air-ground interface by a nonnegligible distance, developed for landmine detection. Vehicle-mounted systems have exclusive advantage that can show subsurface imaging in horizontal slices based on grid GPR data set. Hand-held GPR system is one of advantageous technologies in mountain district etc. But handheld...
Recent studies have shown stiffness is an relevant tissue property to monitor during High Intensity Focused Ultrasound (HIFU) treatments. Tissue stiffness is temperature-dependant but also a major indicator of thermal necrosis. Shear Wave Imaging can be used to map stiffness changes in 2D, but current inverse problem limits the spatial resolution and contrast of elasticity maps. The aim of this study...
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