Dr. Jeffrey H. Hunt Profile

Dr. Jeffrey H. Hunt

Senior Technical Fellow at The Boeing Company

SPIE Involvement:

Author | Editor

Proceedings Article | 26 February 2010 Paper

Ultra-high sensitivity photodetector arrays with integrated amplification and passivation nano-layers

Jie Yao, Irina Mokina, Feng Liu, Sean Wang, Jack Zhou, Michael Lange, Weiguo Yang, Patrick Gardner, Leora Peltz, Robert Frampton, Jeffrey Hunt

Proceedings Volume 7598, 759812 (2010) https://doi.org/10.1117/12.841146

KEYWORDS: Indium gallium arsenide, Chemical analysis, Signal detection, Photodetectors, Avalanche photodiodes, Atomic layer deposition, Near infrared, Avalanche photodetectors, Molybdenum, Sensors

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Proceedings Article | 8 May 2009 Paper

Integrated amplification and passivation nanolayers for ultra-high-sensitivity photodetector arrays: application for laser-induced breakdown spectroscopy (LIBS) and Raman spectroscopy

Patrick Gardner, Jie Yao, Sean Wang, Jack Zhou, Ken Li, Irina Mokina, Michael Lange, Weiguo Yang, Leora Peltz, Robert Frampton, Jeffrey Hunt, Jill Becker

Proceedings Volume 7304, 730411 (2009) https://doi.org/10.1117/12.821922

KEYWORDS: Laser induced breakdown spectroscopy, Raman spectroscopy, Chemical analysis, Sensors, Avalanche photodiodes, Near infrared, Signal to noise ratio, Phototransistors, Receivers, Signal detection

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Proceedings Article | 6 May 2009 Paper

Optical engine initiation: multiple compartment applications

Jeffrey Hunt

Proceedings Volume 7314, 73140E (2009) https://doi.org/10.1117/12.821741

KEYWORDS: Combustion, Oxygen, Chemical reactions, Molecules, Laser optics, Rockets, Aerospace engineering, Chemical species, Absorption, Pulsed laser operation

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Modern day propulsion systems are used in aerospace applications for different purposes. The aerospace industry typically requires propulsion systems to operate in a rocket mode in order to drive large boost vehicles. The defense industry generally requires propulsion systems to operate in an air-breathing mode in order to drive missiles. A mixed system could use an air-breathing first stage and a rocket-mode upper stage for space access. Thus, propulsion systems can be used for high mass payloads and where the payload is dominated by the fuel/oxidizer mass being used by the propulsion system. The pulse detonation wave engine (PDWE) uses an alternative type of detonation cycle to achieve the same propulsion results. The primary component of the PDWE is the combustion chamber (or detonation tube). The PDWE represents an attractive propulsion source since its engine cycle is thermodynamically closest to that of a constant volume reaction. This characteristic leads to the inference that a maximum of the potential energy of the PDWE is put into thrust and not into flow work. Consequently, the volume must be increased. The technical community has increasingly adopted the alternative choice of increasing total volume by designing the engine to include a set of banks of smaller combustion chambers. This technique increases the complexity of the ignition subsystem because the inter-chamber timing must be considered. Current approaches to igniting the PDWE have involved separate shock or blast wave initiators and chemical additives designed to enhance detonatibility. An optical ignition subsystem generates a series of optical pulses, where the optical pulses ignite the fuel/oxidizer mixture such that the chambers detonate in a desired order. The detonation system also has an optical transport subsystem for transporting the optical pulses from the optical ignition subsystem to the chambers. The use of optical ignition and transport provides a non-toxic, small, lightweight, precisely controlled detonation system.

Proceedings Article | 7 February 2009 Paper

Ultra-high sensitivity photodetector arrays with integrated amplification and passivation nano-layers

Jie Yao, Sean Wang, Jack Zhou, Ken Li, Michael Lange, Weiguo Yang, Patrick Gardner, Leora Peltz, Robert Frampton, Jeffrey Hunt, Jill Becker

Proceedings Volume 7212, 72120Y (2009) https://doi.org/10.1117/12.808442

KEYWORDS: Chemical analysis, Signal detection, Photodetectors, Sensors, Avalanche photodiodes, Laser induced breakdown spectroscopy, Biological research, Near infrared, Spectrometers, Raman spectroscopy

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