Carey Rappaport | Northeastern University (original) (raw)

Papers by Carey Rappaport

Research paper thumbnail of Report to the Faculty Senate: Research Policy Oversight Committee, 2007-2008

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Research paper thumbnail of Modeling and inversion of weakly scattering subcellular inhomogeneities in electrically large cells

2007 IEEE Antennas and Propagation International Symposium, 2007

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Research paper thumbnail of FDTD Simulation of a Confocal Microscope Using a Theta Line Scanner

... positive effect on the signal strength. FDTD Simulation of a Confocal Microscope Using a Thet... more ... positive effect on the signal strength. FDTD Simulation of a Confocal Microscope Using a Theta Line Scanner Blair Simon, Prof. ... expected focal point and the actual focal point are one in the same. A large heterogeneous object, it acts like a lens and moves the ...

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Research paper thumbnail of Reflector Antennas

Wiley Encyclopedia of Telecommunications, 2003

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Research paper thumbnail of Modeling Clutter from Bosnian and Puerto Rican Rough Ground Surfaces for GPR Subsurface Sensing Applications Using the SDFMM

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Research paper thumbnail of Ground Penetrating Radar

Electrical Engineering Handbook, 2007

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Research paper thumbnail of A simple approximation of transmitted wavefront shape from point sources above lossy half spaces

IEEE International IEEE International IEEE International Geoscience and Remote Sensing Symposium, 2004. IGARSS '04. Proceedings. 2004, 2000

ABSTRACT

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Research paper thumbnail of Balloon angioplasty device

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Research paper thumbnail of Impulse response of Vivaldi antenna using cubic-spline and exponential taper profiles for compact ground penetrating radar applications

2010 IEEE Antennas and Propagation Society International Symposium, 2010

The measured impulse responses of Vivaldi tapered slot antennas employing conventional exponentia... more The measured impulse responses of Vivaldi tapered slot antennas employing conventional exponential and cubic-spline taper profiles are presented and compared. The method used to design the tapers is based on a Chebyshev impedance transformer given in which minimizes reflection. A brief presentation is given for this design method and the profile of the tapers. Then, the experimental results and analysis

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Research paper thumbnail of Ultrasound sensing of ground displacement in the presence of surface roughness for landmine detection

The Journal of the Acoustical Society of America, 2005

ABSTRACT

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Research paper thumbnail of Optimal Microwave Source Distribution For Heating Off-center Tumors In Biological Spheres

Proceedings of the Annual International Conference of the Ieee Engineering in Medicine and Biology Society Volume 13 1991, 1991

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Research paper thumbnail of Bimodal Detection of Underground Contamination in Two Dimensional Systems, 2007

Proceedings of Spie the International Society For Optical Engineering, May 4, 2007

Widespread contamination of underground environments with dense non-aqueous phase liquids (DNAPLs... more Widespread contamination of underground environments with dense non-aqueous phase liquids (DNAPLs) is of great concern to the public, military, and industrial sectors. Proper management of contaminated sites requires detection and monitoring of the contaminants, and accurate knowledge of their transport behavior in underground environments. Over the last years we have done great efforts to develop and integrate technologies that serve to locate contamination and monitor transport mechanism underground. In this paper, we describe a two-dimensional multiphase flow experiment to develop and evaluate two modes of concurrent detection and monitoring technologies: Cross Well Radar (CWR) and Image Analysis (IA). Loop antennas preset at specific locations in the tank are used to evaluate wave scattering properties of the soil under different conditions, while color images are acquired. The electromagnetic response in the CWR antennas and IA are used to establish the relation between electrical soil properties variations and changes spatial and temporal mass of water and contaminants. The technologies used in this research are both in development, but they can be successful tools for the detection, monitoring and imagining of underground contaminants and process. Once develop, the technology may be applied for detecting and monitoring other buried objects.

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Research paper thumbnail of Simulating GPR for diagnosis of civil infrastructure

Abstract At the present, a large proportion of our nation's bridges and roadways are fal... more Abstract At the present, a large proportion of our nation's bridges and roadways are falling into disrepair. About 27.5% of US bridges are structurally deficient or functionally obsolete (ASCE, 2001, 2003). Nondestructive testing methods, such as GPR, are becoming more ...

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Research paper thumbnail of Wide-aperture catheter-based microwave cardiac ablation antenna

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Research paper thumbnail of Ray tracing simulation tool for portal-based millimeter-wave security systems using the NVIDIA® OptiX™ ray tracing engine

2014 Usnc Ursi Radio Science Meeting, Jul 1, 2014

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Research paper thumbnail of The Semi-Analytic Mode Matching algorithm for GPR wave scattering from multiple complex objects buried in a dielectric half space

2010 Ieee International Geoscience and Remote Sensing Symposium, Jul 25, 2010

The Semi-Analytic Mode Matching (SAMM) algorithm is a quick and efficient computational method th... more The Semi-Analytic Mode Matching (SAMM) algorithm is a quick and efficient computational method that can model wave scattering from multiple objects in half spaces. This algorithm relies heavily on the appropriate choice of coordinate scattering centers (CSCs) for its modal expansions. Here, the radius of curvature method of finding CSCs is extended to “tune” the CSC loci. Because the CSC locations are essentially frequency independent and independent of the dielectric contrast between scatterer and background, it is worthwhile to analyze carefully particular scattering object shapes and store the optimal CSC locations for future use. Scattering from multiple targets buried within half spaces can be constructed from simpler simulations of the individual targets taken independently in uniform media - combining these initial simulations correctly can greatly reduce overall computational time and increase robustness in full simulations. Excellent results are found comparing SAMM and Finite Difference Frequency Domain (FDFD) for multiple 2D scattering objects 0.1 - 15 wavelengths in size located beneath half spaces.

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Research paper thumbnail of A novel, non-iterative, analytic method to find the surface refraction point for air-coupled ground penetrating radar

Proceedings of the 5th European Conference on Antennas and Propagation, Apr 11, 2011

ABSTRACT An analytic algebraic formulation has been derived to find the ground surface refraction... more ABSTRACT An analytic algebraic formulation has been derived to find the ground surface refraction point for rays originating at a source point in air and arriving at a specific underground destination point. Finding precise refraction points is useful for air-coupled GPR underground imaging. The procedure is based on finding the parent hyperbola from which unbent rays originate, then finding initial guesses for ray intersection points based on the best fit asymptote or circle, then finding an improved intersection point using second-order perturbation analysis. The resulting approximations for a typical geometry are below 2% error.

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Research paper thumbnail of Zooming and Scanning Gregorian Confocal Dual Reflector Antennas

Ieee Transactions on Antennas and Propagation, Sep 1, 2008

Abstract—The zooming and scanning capabilities of a Gregorian confocal dual reflector antenna are... more Abstract—The zooming and scanning capabilities of a Gregorian confocal dual reflector antenna are described. The basic antenna configuration consists of two oppositely facing paraboloidal re-flectors sharing a common focal point. A planar feed array is used to illuminate the ...

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Research paper thumbnail of Multiple wavelength microwave-enhanced infrared thermography

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Research paper thumbnail of An offset bifocal reflector antenna design for wide-angle beam scanning

Antennas and Propagation Ieee Transactions on, Nov 1, 1984

A synthesis procedure and performance results for an offset dual reflector with perfect focusing ... more A synthesis procedure and performance results for an offset dual reflector with perfect focusing at + or - 8 deg of beam scan are presented. This bifocal antenna extends the theory of the previously reported symmetric system to an offset design. Approximations, such as the smearing of focal points into a 'focal ring', are eliminated, as is blockage. The offset design affords greater design flexibility, although the synthesis is more complex. Computed and experimental results demonstrate the improved beam-scanning performance of this antenna.

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Research paper thumbnail of Report to the Faculty Senate: Research Policy Oversight Committee, 2007-2008

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Research paper thumbnail of Modeling and inversion of weakly scattering subcellular inhomogeneities in electrically large cells

2007 IEEE Antennas and Propagation International Symposium, 2007

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Research paper thumbnail of FDTD Simulation of a Confocal Microscope Using a Theta Line Scanner

... positive effect on the signal strength. FDTD Simulation of a Confocal Microscope Using a Thet... more ... positive effect on the signal strength. FDTD Simulation of a Confocal Microscope Using a Theta Line Scanner Blair Simon, Prof. ... expected focal point and the actual focal point are one in the same. A large heterogeneous object, it acts like a lens and moves the ...

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Research paper thumbnail of Reflector Antennas

Wiley Encyclopedia of Telecommunications, 2003

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Research paper thumbnail of Modeling Clutter from Bosnian and Puerto Rican Rough Ground Surfaces for GPR Subsurface Sensing Applications Using the SDFMM

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Research paper thumbnail of Ground Penetrating Radar

Electrical Engineering Handbook, 2007

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Research paper thumbnail of A simple approximation of transmitted wavefront shape from point sources above lossy half spaces

IEEE International IEEE International IEEE International Geoscience and Remote Sensing Symposium, 2004. IGARSS '04. Proceedings. 2004, 2000

ABSTRACT

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Research paper thumbnail of Balloon angioplasty device

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Impulse response of Vivaldi antenna using cubic-spline and exponential taper profiles for compact ground penetrating radar applications

2010 IEEE Antennas and Propagation Society International Symposium, 2010

The measured impulse responses of Vivaldi tapered slot antennas employing conventional exponentia... more The measured impulse responses of Vivaldi tapered slot antennas employing conventional exponential and cubic-spline taper profiles are presented and compared. The method used to design the tapers is based on a Chebyshev impedance transformer given in which minimizes reflection. A brief presentation is given for this design method and the profile of the tapers. Then, the experimental results and analysis

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Ultrasound sensing of ground displacement in the presence of surface roughness for landmine detection

The Journal of the Acoustical Society of America, 2005

ABSTRACT

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Optimal Microwave Source Distribution For Heating Off-center Tumors In Biological Spheres

Proceedings of the Annual International Conference of the Ieee Engineering in Medicine and Biology Society Volume 13 1991, 1991

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Bimodal Detection of Underground Contamination in Two Dimensional Systems, 2007

Proceedings of Spie the International Society For Optical Engineering, May 4, 2007

Widespread contamination of underground environments with dense non-aqueous phase liquids (DNAPLs... more Widespread contamination of underground environments with dense non-aqueous phase liquids (DNAPLs) is of great concern to the public, military, and industrial sectors. Proper management of contaminated sites requires detection and monitoring of the contaminants, and accurate knowledge of their transport behavior in underground environments. Over the last years we have done great efforts to develop and integrate technologies that serve to locate contamination and monitor transport mechanism underground. In this paper, we describe a two-dimensional multiphase flow experiment to develop and evaluate two modes of concurrent detection and monitoring technologies: Cross Well Radar (CWR) and Image Analysis (IA). Loop antennas preset at specific locations in the tank are used to evaluate wave scattering properties of the soil under different conditions, while color images are acquired. The electromagnetic response in the CWR antennas and IA are used to establish the relation between electrical soil properties variations and changes spatial and temporal mass of water and contaminants. The technologies used in this research are both in development, but they can be successful tools for the detection, monitoring and imagining of underground contaminants and process. Once develop, the technology may be applied for detecting and monitoring other buried objects.

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Simulating GPR for diagnosis of civil infrastructure

Abstract At the present, a large proportion of our nation's bridges and roadways are fal... more Abstract At the present, a large proportion of our nation's bridges and roadways are falling into disrepair. About 27.5% of US bridges are structurally deficient or functionally obsolete (ASCE, 2001, 2003). Nondestructive testing methods, such as GPR, are becoming more ...

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Research paper thumbnail of Wide-aperture catheter-based microwave cardiac ablation antenna

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Ray tracing simulation tool for portal-based millimeter-wave security systems using the NVIDIA® OptiX™ ray tracing engine

2014 Usnc Ursi Radio Science Meeting, Jul 1, 2014

Bookmarks Related papers MentionsView impact

Research paper thumbnail of The Semi-Analytic Mode Matching algorithm for GPR wave scattering from multiple complex objects buried in a dielectric half space

2010 Ieee International Geoscience and Remote Sensing Symposium, Jul 25, 2010

The Semi-Analytic Mode Matching (SAMM) algorithm is a quick and efficient computational method th... more The Semi-Analytic Mode Matching (SAMM) algorithm is a quick and efficient computational method that can model wave scattering from multiple objects in half spaces. This algorithm relies heavily on the appropriate choice of coordinate scattering centers (CSCs) for its modal expansions. Here, the radius of curvature method of finding CSCs is extended to “tune” the CSC loci. Because the CSC locations are essentially frequency independent and independent of the dielectric contrast between scatterer and background, it is worthwhile to analyze carefully particular scattering object shapes and store the optimal CSC locations for future use. Scattering from multiple targets buried within half spaces can be constructed from simpler simulations of the individual targets taken independently in uniform media - combining these initial simulations correctly can greatly reduce overall computational time and increase robustness in full simulations. Excellent results are found comparing SAMM and Finite Difference Frequency Domain (FDFD) for multiple 2D scattering objects 0.1 - 15 wavelengths in size located beneath half spaces.

Bookmarks Related papers MentionsView impact

Research paper thumbnail of A novel, non-iterative, analytic method to find the surface refraction point for air-coupled ground penetrating radar

Proceedings of the 5th European Conference on Antennas and Propagation, Apr 11, 2011

ABSTRACT An analytic algebraic formulation has been derived to find the ground surface refraction... more ABSTRACT An analytic algebraic formulation has been derived to find the ground surface refraction point for rays originating at a source point in air and arriving at a specific underground destination point. Finding precise refraction points is useful for air-coupled GPR underground imaging. The procedure is based on finding the parent hyperbola from which unbent rays originate, then finding initial guesses for ray intersection points based on the best fit asymptote or circle, then finding an improved intersection point using second-order perturbation analysis. The resulting approximations for a typical geometry are below 2% error.

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Zooming and Scanning Gregorian Confocal Dual Reflector Antennas

Ieee Transactions on Antennas and Propagation, Sep 1, 2008

Abstract—The zooming and scanning capabilities of a Gregorian confocal dual reflector antenna are... more Abstract—The zooming and scanning capabilities of a Gregorian confocal dual reflector antenna are described. The basic antenna configuration consists of two oppositely facing paraboloidal re-flectors sharing a common focal point. A planar feed array is used to illuminate the ...

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Research paper thumbnail of Multiple wavelength microwave-enhanced infrared thermography

Bookmarks Related papers MentionsView impact

Research paper thumbnail of An offset bifocal reflector antenna design for wide-angle beam scanning

Antennas and Propagation Ieee Transactions on, Nov 1, 1984

A synthesis procedure and performance results for an offset dual reflector with perfect focusing ... more A synthesis procedure and performance results for an offset dual reflector with perfect focusing at + or - 8 deg of beam scan are presented. This bifocal antenna extends the theory of the previously reported symmetric system to an offset design. Approximations, such as the smearing of focal points into a 'focal ring', are eliminated, as is blockage. The offset design affords greater design flexibility, although the synthesis is more complex. Computed and experimental results demonstrate the improved beam-scanning performance of this antenna.

Bookmarks Related papers MentionsView impact