Dr. Steven T. Griffin Profile

Dr. Steven T. Griffin

SDL Author at Univ of Memphis

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Author

Publications (18)

Proceedings Article | 13 June 2014 Paper

Spatially selective mirror for compressive sensing imaging system

Steven Griffin

Proceedings Volume 9078, 90780D (2014) https://doi.org/10.1117/12.2050834

KEYWORDS: Sensors, Compressed sensing, Infrared imaging, Signal detection, Imaging systems, Stochastic processes, Diffraction, Statistical modeling, Mirrors, Associative arrays

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Proceedings Article | 16 October 2013 Paper

Characterization of optically compressing diode array for spectroscopic applications

Steven Griffin

Proceedings Volume 8901, 890105 (2013) https://doi.org/10.1117/12.2029338

KEYWORDS: Sensors, Signal processing, Spectroscopy, Compressed sensing, Computing systems, Diodes, Transform theory, Electronics, Signal detection, Computer programming

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Spectroscopic detection and classification techniques suffer from the collection of excessive data and utilize only a fraction of the information collected for classification. Compressed Sensing (CS) techniques have been utilized in optical, photonic, electronic and controls applications. This limits data collection to the essentials and reduces the hardware, software, and computational requirements. Applying CS to just the general computational system results in the collection of data which is ultimately discarded. The result is excessive power consumption, mass, physical sizes, and complexity. Compressive Sensing requires, at a minimum, a non-uniform encoding system with a non-linear decompression system for total reconstruction. Pseudorandom encoding is frequently preferred. Total reconstruction of a compressed signal has been shown to be very computational intensive and other optical-based techniques have been demonstrated to accelerate the result. Prior work has demonstrated that total reconstruction is not necessary for effective classification via PCA and other spectroscopic relevant techniques. Prior work revised the system design and modified the signal processing, both electronic and computational, to reduce system requirements. To propagate this savings back into the photonics and optical chain, it is necessary to further develop alternative techniques. In particular, a modification to the traditional LDA allows the contraction of primary optics. In this presentation an optical detector scheme is detailed. A number of configurations are considered with the most savings achieved by a spatial integrating version that allows the maintenance of optical and photonic SNR by collecting a number of photons greater than or equal to the traditional LDA. Since primary optical diameter is largely specified by the need to subtend an angle sufficient to overcome system noise, optical diameters can be reduced by up to an order of magnitude. This also mitigates optical diameter driven resolution at the detector plane. Some third order and higher issues exist and are addressed. Theoretical development with limited empirical support is to be presented.

Proceedings Article | 29 May 2013 Paper

Investigation of short cavity CRDS noise terms by optical correlation

Steven Griffin, Jason Fathi

Proceedings Volume 8710, 87100P (2013) https://doi.org/10.1117/12.2016212

KEYWORDS: Sensors, Signal to noise ratio, Data analysis, Fabry–Perot interferometers, Absorption, Optical correlators, Speckle, Refraction, Atmospheric modeling, Interference (communication)

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Proceedings Article | 29 May 2013 Paper

LIBS plasma model validation

Steven Griffin, Brandon Dent

Proceedings Volume 8710, 87100A (2013) https://doi.org/10.1117/12.2016208

KEYWORDS: Plasma, Laser induced breakdown spectroscopy, Thermodynamics, Systems modeling, Ionization, Data modeling, Ions, Spectroscopy, Chemical analysis, Atmospheric plasma

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Proceedings Article | 29 May 2013 Paper

LIBS controls characterization of predictor corrector-based LIBS data collection

Alex Sanders, Steven Griffin

Proceedings Volume 8710, 87101P (2013) https://doi.org/10.1117/12.2016193

KEYWORDS: Control systems, Laser induced breakdown spectroscopy, Principal component analysis, Digital signal processing, Binary data, Sensors, Control systems design, Performance modeling, Distance measurement, Statistical analysis

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Proceedings Article | 18 June 2012 Paper

LIBS data analysis using a predictor-corrector based digital signal processor algorithm

Alex Sanders, Steven Griffin, Aaron Robinson

Proceedings Volume 8359, 83590T (2012) https://doi.org/10.1117/12.919518

KEYWORDS: Digital signal processing, Principal component analysis, Signal processing, Laser induced breakdown spectroscopy, Distance measurement, Spectroscopy, Binary data, Sensors, Sensor technology, Data analysis

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Proceedings Article | 5 May 2012 Paper

Reduced LIBS plasma model via thermodynamics

Steven Griffin, Brandon Dent

Proceedings Volume 8358, 835812 (2012) https://doi.org/10.1117/12.919167

KEYWORDS: Plasma, Thermodynamics, Laser induced breakdown spectroscopy, Systems modeling, Digital signal processing, Classification systems, Sensors, Spectroscopy, Computing systems, Ionization

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Proceedings Article | 4 June 2011 Paper

LIBS spectroscopic classification relative to compressive sensing

Steven Griffin, Eddie Jacobs, Orges Furxhi

Proceedings Volume 8018, 80180S (2011) https://doi.org/10.1117/12.887066

KEYWORDS: Laser induced breakdown spectroscopy, Compressed sensing, Spectroscopy, Signal processing, Sensors, Signal detection, Magnetic resonance imaging, Electronics, Principal component analysis, Spectroscopes

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Proceedings Article | 5 May 2010 Paper

Laser-induced breakdown plasma-based sensors

Steven Griffin

Proceedings Volume 7665, 76650Z (2010) https://doi.org/10.1117/12.850095

KEYWORDS: Plasma, Laser induced breakdown spectroscopy, Sensors, Systems modeling, Physics, Spectroscopy, Computer simulations, Performance modeling, Ionization, MATLAB

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Proceedings Article | 8 May 2009 Paper

Spectroscopic material determination via LIBS and CRDS

Steven Griffin

Proceedings Volume 7304, 73040V (2009) https://doi.org/10.1117/12.818498

KEYWORDS: Sensors, Laser induced breakdown spectroscopy, Spectroscopy, Performance modeling, Taxonomy, Signal processing, Transducers, Adsorption, Systems modeling, Computer simulations

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Proceedings Article | 15 April 2008 Paper

Aplanatic THz imaging

Steven Griffin, Keith Krapels

Proceedings Volume 6949, 69490H (2008) https://doi.org/10.1117/12.777087

KEYWORDS: Terahertz radiation, Aspheric lenses, Imaging systems, Optical design, Geometrical optics, Specular reflections, Spherical lenses, Zoom lenses, Optical components, Reflectivity

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Proceedings Article | 10 May 2007 Paper

Advanced terahertz imaging system performance model for concealed weapon identification

Steven Murrill, Brian Redman, Richard Espinola, Charmaine Franck, Douglas Petkie, Frank De Lucia, Eddie Jacobs, Steven Griffin, Carl Halford, Joe Reynolds

Proceedings Volume 6549, 654902 (2007) https://doi.org/10.1117/12.723032

KEYWORDS: Imaging systems, Terahertz radiation, Performance modeling, Sensors, Reflectivity, Receivers, Aluminum, Target detection, Specular reflections, Atmospheric modeling

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Proceedings Article | 4 May 2007 Paper

Modeling and characterization of cloth at sub-millimeter wavelengths

Eddie Jacobs, Steven Griffin

Proceedings Volume 6549, 654904 (2007) https://doi.org/10.1117/12.718749

KEYWORDS: Reflectivity, Radar, Humidity, Skin, Scattering, Liquids, Reflection, Absorption, Water, Signal attenuation

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Proceedings Article | 4 May 2007 Paper

Reflectivity and emissivity modeling for metals and plastics at THz frequencies

Steven Griffin, Eddie Jacobs, Steve Murrill

Proceedings Volume 6549, 65490F (2007) https://doi.org/10.1117/12.719726

KEYWORDS: Terahertz radiation, Metals, Reflectivity, Water, Absorption, Data modeling, Systems modeling, Plasma, Specular reflections, Refraction

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Proceedings Article | 4 May 2007 Paper

Terahertz standoff imaging testbed design and performance for concealed weapon and device identification model development

Charmaine Franck, Dave Lee, Richard Espinola, Steven Murrill, Eddie Jacobs, Steve Griffin, Douglas Petkie, Joe Reynolds

Proceedings Volume 6549, 654908 (2007) https://doi.org/10.1117/12.723764

KEYWORDS: Terahertz radiation, Mirrors, Imaging systems, Receivers, Performance modeling, Sensors, Data acquisition, Target acquisition, Atmospheric modeling, Weapons

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Proceedings Article | 7 November 2005 Paper

Terahertz imaging system performance model for concealed weapon identification

Steven Murrill, Eddie Jacobs, Steven Moyer, Carl Halford, Steven Griffin, Frank De Lucia, Douglas Petkie, Charmaine Franck

Proceedings Volume 5989, 59891E (2005) https://doi.org/10.1117/12.630877

KEYWORDS: Sensors, Performance modeling, Imaging systems, Terahertz radiation, Modulation transfer functions, Eye, Atmospheric modeling, Target detection, Contrast transfer function, Reflectivity

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Proceedings Article | 7 November 2005 Paper

Active and passive millimeter- and sub-millimeter-wave imaging

Douglas Petkie, Frank De Lucia, Corey Castro, Paul Helminger, Eddie Jacobs, Steven Moyer, Steve Murrill, Carl Halford, Steve Griffin, Charmaine Franck

Proceedings Volume 5989, 598918 (2005) https://doi.org/10.1117/12.638982

KEYWORDS: Imaging systems, Scattering, Sensors, Mirrors, Performance modeling, Systems modeling, Receivers, Heterodyning, Signal attenuation, Millimeter wave imaging

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SPIE Journal Paper | 1 November 1991

Imaging with frequency-modulated reticles

Jeffrey Sanders, Ronald Driggers, Carl Halford, Steven Griffin

OE, Vol. 30, Issue 11, (November 1991) https://doi.org/10.1117/12.10.1117/12.55994

KEYWORDS: Reticles, Sensors, Modulation, Frequency modulation, Imaging systems, Fermium, Mirrors, Signal detection, Staring arrays, Electronic filtering

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Showing 5 of 18 publications

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