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Field experiments of air surface wave propagation at 160 MHz were performed on a rough non-conductive dielectric talus slope of granite blocks, all of the same composition. Amplitudes for both vertical and cross polarization were measured meter by meter along linear transects 250 and 500 m long, along with GPS measurements of position and elevation. Attenuation rates for both polarizations were greater...
High frequency (>100 kHz) electromagnetic induction (HFEMI) sensing phenomena are investigated for nonmetallic ordnances detection and discrimination. HFEMI responses are studied using numerical and experimental data. The numerical modeling is done via the method of auxiliary sources, and data are collected using a new HEMI system, that has been developed at our lab. The comparisons between modeled...
In this paper, West Messa UXO classification results are presented for cued data collected by the Metal mapper sensor. Data sets are inverted using advanced forward EMI model called the orthonormalized volume magnetic source (ONVMS) model. All data are inverted as single, two and three sources. For each inversion, targets intrinsic parameters are extracted and used in a library matching technique...
Using the finite difference time domain (FDTD) numerical simulation approach and synthetic computational experiments we investigated the use of the ultra-wide band (UWB) radar technique for human vital sign detection under collapsed building debris caused by catastrophic earthquakes. The model of the collapsed building was developed based on a real situation from an earthquake disaster site. The model...
We present a three-dimensional (3D), multi-region (MR) pseudospectral time domain (PSTD) method with directional Kirchhoff integration (DKI) surface for simulating electromagnetic (EM) wave propagation in large domain heterogeneous media. The basic idea is to divide the whole computational domain into a number of sub-regions containing strong scatters embedded into a uniform background. The PSTD method...
We developed an optical probe for cross-polarized reflected light measurements and investigated optical signals associated with electrophysiological activation in isolated lobster nerves. The cross-polarized baseline light intensity (structural signal) and the amplitude of the transient response to stimulation (functional signal) measured in reflected mode were dependent on the orientation of the...
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