Dr. Lloyd S. Riggs Profile

Dr. Lloyd S. Riggs

Professor at Auburn Univ

SPIE Involvement:

Author

Proceedings Article | 10 June 2005 Paper

A comparison of discrimination capabilities of time- and frequency-domain electromagnetic induction systems

Sailaja Chilaka, Daniel Faircloth, Lloyd Riggs, Michael Baginski

Proceedings Volume 5794, (2005) https://doi.org/10.1117/12.603729

KEYWORDS: Electromagnetic coupling, Transmitters, Receivers, Signal to noise ratio, Electromagnetism, Sensors, Finite element methods, Data acquisition, Optical spheres

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Proceedings Article | 10 June 2005 Paper

Investigation of an EMI sensor for detection of large metallic objects in the presence of metallic clutter

Christopher Black, Ian McMichael, Lloyd Riggs

Proceedings Volume 5794, (2005) https://doi.org/10.1117/12.605219

KEYWORDS: Sensors, Electromagnetic coupling, Transmitters, Target detection, Receivers, Inductance, Metals, Magnetism, Optical spheres, Electronics

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Proceedings Article | 21 September 2004 Paper

Extremely low-frequency response (below 30 Hz) of UXO-like objects

Sailaja Chilaka, Lloyd Riggs, Herbert Nelson, Thomas Bell

Proceedings Volume 5415, (2004) https://doi.org/10.1117/12.542649

KEYWORDS: Receivers, Transmitters, Magnetism, Electromagnetic coupling, Finite element methods, Copper, Optical spheres, Target detection, Amplifiers, Solids

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Extremely low frequency measurements, below 30 Hz, of solid, thin-, and, thick-walled steel (permeable) cylinders with length-to-diameter ratios of approximately 4 are described and compared with the predicted response computed using a frequency domain finite element method (FDFEM). Measurements were made using a conventional EMI test setup consisting of a Hewlett Packard 89410 vector signal analyzer, rectangular transmitting and a figure-eight (bucked) receiving coil, along with appropriate transmitter and receiver coil amplifiers. All cylinders were measured with the predominant component of the excitatory magnetic field both aligned with and orthogonal to (two distinct measurements) the cylinder's axis. Measurements were made with and without a centered copper ring on the cylinders. The ring simulates the so-called rotating bands on actual UXO. Not surprisingly, we observed that the quadrature peak of the response shifts down in frequency much more when the axis of the ringed cylinder is aligned with the excitatory magnetic field than when perpendicular to it. Our measurements indicated that the real part of the response of the smallest cylinders measured asymptotically approaches its DC value around 1 Hz while the largest of the cylinders measured does not asymptote until well below 1 Hz. It appears that target information that may be crucial for discrimination purposes, especially for larger targets, exists at frequencies well below 30 Hz. Extremely low frequency measurements, especially with data averaging (stacking), can be a rather time consuming process, and therefore it is not likely that such measurements can be made from a moving platform. However, once an object of interest has been detected, the target can be reacquired and the measurement taken with the sensor stationary with respect to the target (sometimes referred to as a qued approach). As our measurements and simulations indicate, the qued method may be necessary if large solid UXO are to be distinguished from large thin-walled clutter objects.

Proceedings Article | 11 September 2003 Paper

Circuit model representation of a continuous wave (CW) electromagnetic induction (EMI) metal detection/discrimination system

Mark Stucker, Lloyd Riggs

Proceedings Volume 5089, (2003) https://doi.org/10.1117/12.487934

KEYWORDS: Receivers, Electromagnetic coupling, Transmitters, Metals, Land mines, Error analysis, Sensors, Electromagnetism, Circuit switching, Continuous wave operation

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Proceedings Article | 11 September 2003 Paper

Region processing of EMI data for landmine detection

Lisa Huettel, Lloyd Riggs, Leslie Collins

Proceedings Volume 5089, (2003) https://doi.org/10.1117/12.487308

KEYWORDS: Sensors, Mining, Detection and tracking algorithms, Metals, Land mines, Copper, Algorithm development, Electromagnetic coupling, Feature extraction, Signal processing

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Proceedings Article | 13 August 2002 Paper

Progress toward an electromagnetic induction mine discrimination system

Lloyd Riggs, Steve Cash, Thomas Bell

Proceedings Volume 4742, (2002) https://doi.org/10.1117/12.479147

KEYWORDS: Electromagnetism, Information operations, Electromagnetic coupling, Mining, Land mines, Sensors, Target detection, Quantum efficiency, Analytical research, Lead

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Proceedings Article | 18 October 2001 Paper

Improvements to the U.S. Army's AN/PSS-12 metal detector to enhance landmine discrimination capabilities

Larry Lowe, Lloyd Riggs, Steve Cash, Thomas Bell

Proceedings Volume 4394, (2001) https://doi.org/10.1117/12.445445

KEYWORDS: Mining, Sensors, Land mines, Receivers, Data acquisition, Calibration, Metals, Detection and tracking algorithms, Amplifiers, Transmitters

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Proceedings Article | 18 October 2001 Paper

Characteristics of the mine hunter/killer close-in detector 16-coil vehicular-mounted metal detector array

Lloyd Riggs, Frank Wing, Carl Nelson, Carl Wiggins, Steven Bishop

Proceedings Volume 4394, (2001) https://doi.org/10.1117/12.445493

KEYWORDS: Copper, Metals, Sensors, Land mines, Mining, Detector arrays, Receivers, General packet radio service, Transmitters, Signal detection

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Proceedings Article | 22 August 2000 Paper

Discrimination between buried metallic mines and metallic clutter using signal energy and exponential decay rates

Lloyd Riggs, Larry Lowe, James Elkins, Thomas Barnett, Richard Weaver

Proceedings Volume 4038, (2000) https://doi.org/10.1117/12.396173

KEYWORDS: Mining, Sensors, Land mines, Calibration, Detection and tracking algorithms, Interference (communication), Metals, Amplifiers, Sensor performance, Algorithm development

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Proceedings Article | 2 August 1999 Paper

Baseline performance of the U.S. Army's AN/PSS-12 metal detector

Lloyd Riggs, Thomas Barnett, Larry Lowe, Jon Mooney, Richard Weaver

Proceedings Volume 3710, (1999) https://doi.org/10.1117/12.357075

KEYWORDS: Sensors, Mining, Amplifiers, Receivers, Metals, Data processing, Head, Magnetism, Data acquisition, Transmitters

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Proceedings Article | 2 August 1999 Paper

Simulants (decoys) for low-metallic-content mines: theory and experimental results

Lloyd Riggs, Larry Lowe, Jon Mooney, Thomas Barnett, Richard Ess, Frank Paca

Proceedings Volume 3710, (1999) https://doi.org/10.1117/12.357085

KEYWORDS: Metals, Land mines, Sensors, Copper, Resistance, Mining, Time metrology, Carbon, Inductance, Target detection

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Proceedings Article | 4 September 1998 Paper

Identification of metallic mines using low-frequency magnetic fields

Lloyd Riggs, Jonathan Mooney, Daniel Lawrence, J. Thomas Broach, Anh Trang

Proceedings Volume 3392, (1998) https://doi.org/10.1117/12.324233

KEYWORDS: Signal to noise ratio, Magnetism, Aluminum, Data modeling, Mining, Monte Carlo methods, Detection and tracking algorithms, Sensors, Error analysis, Metals

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Showing 5 of 12 publications

Conference Committee Involvement (3)

Detection and Remediation Technologies for Mines and Minelike Targets X

28 March 2005 | Orlando, Florida, United States

Detection and Remediation Technologies for Mines and Minelike Targets IX

12 April 2004 | Orlando, Florida, United States

Detection and Remediation Technologies for Mines and Minelike Targets VIII

21 April 2003 | Orlando, Florida, United States

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