Mr. Robert A. Richwine Profile

Robert A. Richwine

at Magnolia Optical Technologies Inc

SPIE Involvement:

Author

Publications (20)

Proceedings Article | 19 September 2013 Paper

Development of III-N UVAPDs for ultraviolet sensor applications

Ashok Sood, Robert Richwine, Roger Welser, Yash Puri, Russell Dupuis, Mi-Hee Ji, Jeomoh Kim, Theeradetch Detchprohm, Nibir Dhar, Roy Peters

Proceedings Volume 8868, 88680T (2013) https://doi.org/10.1117/12.2032207

KEYWORDS: Ultraviolet radiation, Avalanche photodetectors, Signal to noise ratio, Pulsed laser operation, Ultraviolet detectors, Atmospheric modeling, Sensors, Target detection, Gallium nitride, Metalorganic chemical vapor deposition

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Proceedings Article | 18 June 2013 Paper

Design and development of wafer-level short wave infrared micro-camera

Ashok Sood, Robert Richwine, Gopal Pethuraja, Yash Puri, Je-Ung Lee, Pradeep Haldar, Nibir Dhar

Proceedings Volume 8704, 870439 (2013) https://doi.org/10.1117/12.1518471

KEYWORDS: Short wave infrared radiation, Silicon, Staring arrays, Sensors, Signal processing, Infrared radiation, Infrared sensors, Infrared imaging, Interference (communication), Thermography

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Proceedings Article | 23 May 2012 Paper

Development of small unit cell avalanche photodiodes for UV imaging applications

Ashok Sood, Roger Welser, Robert Richwine, Yash Puri, Russell Dupuis, Jae-Hyun Ryou, Nibir Dhar, P. Suvarna, F. Shahedipour-Sandvik

Proceedings Volume 8375, 83750R (2012) https://doi.org/10.1117/12.923182

KEYWORDS: Avalanche photodetectors, Ultraviolet radiation, Gallium nitride, Signal to noise ratio, Pulsed laser operation, Sensors, Atmospheric modeling, Target detection, Image resolution, Ultraviolet detectors

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Proceedings Article | 16 September 2011 Paper

Avalanche photodiodes for high-resolution UV imaging applications

Ashok Sood, Robert Richwine, E. James Egerton, Yash Puri, Russell Dupuis, Nibir Dhar, Raymond Balcerak

Proceedings Volume 8155, 815509 (2011) https://doi.org/10.1117/12.895288

KEYWORDS: Ultraviolet radiation, Avalanche photodetectors, Signal to noise ratio, Pulsed laser operation, Interference (communication), Sensors, Target detection, Image resolution, Gallium nitride, Electrons

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Proceedings Article | 24 May 2011 Paper

Nanostructure-based EO/IR focal plane array development for unattended ground sensor applications

Ashok Sood, E. James Egerton, Robert Richwine, Yash Puri, Tariq Manzur, Nibir Dhar, Dennis Polla, Zhong L. Wang, Gustavo Fernandes, Jimmy Xu, Priyalal Wijewarnasuriya, A. F. M. Anwar

Proceedings Volume 8046, 80460N (2011) https://doi.org/10.1117/12.888125

KEYWORDS: Zinc oxide, Sensors, Ultraviolet radiation, Signal to noise ratio, Nanostructures, Unattended ground sensors, Staring arrays, Interference (communication), Solar energy, Nanowires

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Proceedings Article | 21 May 2011 Paper

Characterization of SiGe-detector arrays for visible-NIR imaging sensor applications

Ashok Sood, Robert Richwine, Adam Sood, Yash Puri, Nicole DiLello, Judy Hoyt, Tayo Akinwande, Nibir Dhar, Raymond Balcerak, Thomas Bramhall

Proceedings Volume 8012, 801240 (2011) https://doi.org/10.1117/12.889205

KEYWORDS: Sensors, Silicon, Signal to noise ratio, Diodes, Germanium, Semiconducting wafers, Staring arrays, Oxides, Photodiodes, Detector arrays

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Proceedings Article | 31 August 2010 Paper

Development of GaN/AlGaN APDs for UV imaging applications

Ashok Sood, Robert Richwine, Yash Puri, Russell Dupuis, Jae-Hyun Ryou, Nibir Dhar, Raymond Balcerak

Proceedings Volume 7780, 77800E (2010) https://doi.org/10.1117/12.866361

KEYWORDS: Ultraviolet radiation, Avalanche photodetectors, Signal to noise ratio, Pulsed laser operation, Interference (communication), Sensors, Target detection, Gallium nitride, Electrons, Image resolution

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Proceedings Article | 31 August 2010 Paper

Development of SiGe arrays for visible-near IR applications

Ashok Sood, Robert Richwine, Yash Puri, Nicole DiLello, Judy Hoyt, Nibir Dhar, Raymond Balcerak, Thomas Bramhall

Proceedings Volume 7780, 77800F (2010) https://doi.org/10.1117/12.866362

KEYWORDS: Sensors, Silicon, Germanium, Signal to noise ratio, Staring arrays, Infrared sensors, Photodiodes, Diodes, Mercury cadmium telluride, Detector arrays

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Proceedings Article | 13 May 2010 Paper

Next generation nanostructure-based EO/IR focal plane arrays for unattended ground sensor applications

Ashok Sood, Robert Richwine, Yash Puri, Tariq Manzur, Nibir Dhar, Dennis Polla, Priyalal Wijewarnasuriya, Yaguang Wei, Jun Zhou, Cheng Li, Zhong Wang, Gustavo Fernandes, J. M. Jimmy Xu

Proceedings Volume 7693, 76930C (2010) https://doi.org/10.1117/12.852192

KEYWORDS: Sensors, Zinc oxide, Signal to noise ratio, Ultraviolet radiation, Nanostructures, Staring arrays, Interference (communication), Unattended ground sensors, Performance modeling, Nanowires

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Proceedings Article | 5 May 2010 Paper

Design and development of carbon nanostructure-based microbolometers for IR imagers and sensors

Ashok Sood, Robert Richwine, Yash Puri, Akin Akturk, Neil Goldsman, Siddharth Potbhare, Gustavo Fernandes, Chih-Hsun Hsu, Jin Ho Kim, Jimmy Xu, Nibir Dhar, Priyalal Wijewarnasuriya, Bobby Lineberry

Proceedings Volume 7679, 76791Q (2010) https://doi.org/10.1117/12.852730

KEYWORDS: Resistance, Bolometers, Nanostructures, Carbon, Sensors, Infrared sensors, Infrared radiation, Thermography, Imaging systems, Image sensors

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Proceedings Article | 4 May 2010 Paper

Development of low dark current SiGe-detector arrays for visible-NIR imaging sensor

Ashok Sood, Robert Richwine, Yash Puri, Nicole DiLello, Judy Hoyt, Tayo Akinwande, Nibir Dhar, Stuart Horn, Raymond Balcerak, Thomas Bramhall

Proceedings Volume 7660, 76600L (2010) https://doi.org/10.1117/12.852682

KEYWORDS: Sensors, Silicon, Germanium, Signal to noise ratio, Staring arrays, Mercury cadmium telluride, Bolometers, Infrared sensors, Diodes, Doping

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Proceedings Article | 28 August 2009 Paper

Design considerations using APD detectors for high resolution UV imaging applications

Ashok Sood, Robert Richwine, Yash Puri, Stuart Horn, Raymond Balcerak

Proceedings Volume 7419, 74190V (2009) https://doi.org/10.1117/12.829900

KEYWORDS: Ultraviolet radiation, Avalanche photodetectors, Signal to noise ratio, Sensors, Pulsed laser operation, Interference (communication), Image resolution, Target detection, Systems modeling, Gallium nitride

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Proceedings Article | 12 May 2009 Paper

EO/IR sensors development using zinc oxide and carbon nanostructures

Ashok Sood, Robert Richwine, Yash Puri, Dennis Polla, Nibir Dhar, Zhong Wang, J. M. Xu, Priyalal Wijewarnasuriya, Neil Goldsman, Martin Soprano, Bobby Lineberry

Proceedings Volume 7318, 731804 (2009) https://doi.org/10.1117/12.820502

KEYWORDS: Zinc oxide, Nanostructures, Sensors, Ultraviolet radiation, Carbon, Infrared sensors, Silicon carbide, Electrodes, Electrons, Nanowires

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Proceedings Article | 7 May 2009 Paper

Development of low dark current SiGe-detector arrays for visible-NIR imaging sensor

Ashok Sood, Robert Richwine, Yash Puri, Nicole DiLello, Judy Hoyt, Tayo Akinwande, Stuart Horn, Ray Balcerak, Gary Bulman, Rama Venkatasubramanian, Arvind D'Souza, Thomas Bramhall

Proceedings Volume 7298, 72983D (2009) https://doi.org/10.1117/12.820896

KEYWORDS: Silicon, Sensors, Signal to noise ratio, Semiconducting wafers, Germanium, Superlattices, Diodes, Etching, Staring arrays, Oxides

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Proceedings Article | 1 May 2009 Paper

Multispectral EO/IR sensor model for evaluating UV, visible, SWIR, MWIR and LWIR system performance

Ashok Sood, Robert Richwine, Yash Puri, Nibir Dhar, Dennis Polla, Priyalal Wijewarnasuriya

Proceedings Volume 7300, 73000H (2009) https://doi.org/10.1117/12.820899

KEYWORDS: Sensors, 3D modeling, Image sensors, Performance modeling, Data modeling, Staring arrays, Ultraviolet radiation, Thermal modeling, Signal to noise ratio, Nonuniformity corrections

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Proceedings Article | 26 August 2008 Paper

Microbolometer sensor model for performance predictions and real-time image generation of infrared scenes and targets

Robert Richwine, Yash Puri, Ashok Sood, Raymond Balcerak, Stuart Horn, Glenn Baker, Michael Wilson

Proceedings Volume 7055, 70550T (2008) https://doi.org/10.1117/12.801337

KEYWORDS: 3D modeling, Sensors, Minimum resolvable temperature difference, Bolometers, Performance modeling, Atmospheric modeling, Modulation transfer functions, Image sensors, Signal to noise ratio, Thermal modeling

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Presented is a comprehensive, physics-based model for microbolometer detector and sensor performance prediction. The model combines equations found in the literature and various standard models that generate NETD, MRTD, 3-D noise statistics and atmosphere characteristics (MODTRAN-based), with a comprehensive microbolometer model and HgCdTe model developed by the author to provide an end-to-end detector/FPA/sensor analysis and design tool, as well as a realistic image sequence generation tool. The model characterizes the individual pixel element based on the structure used, the various layer thicknesses, the electrical and thermal characteristics of the bolometer material and the biasing and readout circuit, and uses these results to calculate response and noise, NEP and NETD. The NETD, MTF and MRTD are predicted from the optics, detector and readout. Predicted NETD has been compared and verified with values found in literature, results from other models, and to uncooled camera measurements. The MRTD prediction has been verified with camera measurements and with standard industry MRTD model outputs. The model also calculates atmospheric path radiance and transmittance for horizontal paths based on MODTRAN outputs for the LWIR band at altitudes from 0 to 10km and ranges from 1 to 50km for assessments of air-to-air engagement SNR's. The model in matlab utililizes a 3-D noise model to provide accurate realistic imagery used to present realistic sensor images and to further validate the NETD and MRTD routines.(1) Images at 30Hz and 60Hz have been generated for visual assessment by the user and have mirrored industry model results and real-time camera images for MRTD's for the temporal noise case. The model's 3-D noise generation feature allows the prediction of MRTD vs. frequency under any 3-D noise combination. This model provides an end-to-end performance prediction tool useful in bolometer element design, readout design and for system level trade studies.

Proceedings Article | 15 May 2008 Paper

Design considerations for SiGe-based near infrared imaging sensor

Ashok Sood, Robert Richwine, Yash Puri, Oluwamuyiwa Olubuyide, Nicole DiLello, Judy Hoyt, Tayo Akinwande, Raymond Balcerak, Stuart Horn, Thomas Bramhall, Daniel Radack

Proceedings Volume 6940, 69400M (2008) https://doi.org/10.1117/12.780768

KEYWORDS: Signal to noise ratio, Sensors, Germanium, Infrared sensors, Near infrared, Silicon, Diodes, Black bodies, Staring arrays, Indium gallium arsenide

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Proceedings Article | 8 September 2006 Paper

A full-spectrum 3D noise-based infrared imaging sensor model

Robert Richwine, Ashok Sood, Yash Puri, Harry Heckathorn, Larry Wilson, Jules Goldspiel

Proceedings Volume 6297, 62970A (2006) https://doi.org/10.1117/12.682837

KEYWORDS: Sensors, 3D modeling, Staring arrays, Nonuniformity corrections, Data modeling, Motion models, Point spread functions, 3D image processing, Infrared sensors, Image sensors

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Proceedings Article | 7 September 2006 Paper

A comprehensive model for bolometer element and uncooled array design and imaging sensor performance prediction

Robert Richwine, Raymond Balcerak, Chuck Rapach, Ken Freyvogel, Ashok Sood

Proceedings Volume 6294, 62940F (2006) https://doi.org/10.1117/12.682836

KEYWORDS: Bolometers, Electro optical modeling, Performance modeling, Thermal modeling, Resistance, 3D modeling, Data modeling, Minimum resolvable temperature difference, Thermography, Cameras

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Proceedings Article | 7 September 2006 Paper

A HgCdTe detector/FPA/sensor model for evaluation of VLWIR to SWIR sensors with an assessment of SWIR sensors for strategic and tactical missions

Robert Richwine, Raymond Balcerak, Ken Freyvogel, Ashok Sood

Proceedings Volume 6294, 62940E (2006) https://doi.org/10.1117/12.682835

KEYWORDS: Sensors, Signal to noise ratio, Mercury cadmium telluride, Missiles, Short wave infrared radiation, Airglow, Domes, Atmospheric sensing, Mid-IR, Staring arrays

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Showing 5 of 20 publications

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