Dr. Steven D. Woodruff Profile

Dr. Steven D. Woodruff

Research Chemist at National Energy Technology Lab

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Author

Publications (12)

Proceedings Article | 1 March 2019 Presentation + Paper

Non-contact surface temperature mapping of alpha-alumina using a Raman scattering method

Juddha Thapa, Steven Woodruff, Michael Buric, Benjamin Chorpening

Proceedings Volume 10919, 1091921 (2019) https://doi.org/10.1117/12.2511792

KEYWORDS: Raman spectroscopy, Temperature metrology, Ceramics, Spectroscopy, High temperature raman spectroscopy, Raman scattering, Sensors

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Proceedings Article | 3 June 2015 Paper

Fuel flexibility via real-time Raman fuel-gas analysis for turbine system control

M. Buric, S. Woodruff, B. Chorpening, D. Tucker

Proceedings Volume 9482, 94820S (2015) https://doi.org/10.1117/12.2177015

KEYWORDS: Control systems, Capillaries, Waveguides, Raman spectroscopy, Gases, Computer simulations, Nitrogen, Methane, Raman scattering, Combustion

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Proceedings Article | 11 June 2014 Paper

Industrial Raman gas sensing for real-time system control

M. Buric, J. Mullen, B. Chorpening, S. Woodruff

Proceedings Volume 9083, 90830U (2014) https://doi.org/10.1117/12.2051241

KEYWORDS: Raman spectroscopy, Waveguides, Calibration, Carbon dioxide, Gases, Syngas, Oxygen, Control systems, Process control, Nitrogen

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SPIE Journal Paper | 22 November 2013

Azimuthal polarization for Raman enhancement in capillary waveguides

Jessica Mullen, Michael Buric, Benjamin Chorpening, Steven Woodruff

OE, Vol. 52, Issue 11, 117103, (November 2013) https://doi.org/10.1117/12.10.1117/1.OE.52.11.117103

KEYWORDS: Polarization, Raman spectroscopy, Waveguides, Capillaries, Hollow waveguides, Gases, Signal attenuation, Wave propagation, Laser scattering, Spectroscopy

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Proceedings Article | 29 May 2013 Paper

Design and industrial testing of ultra-fast multi-gas Raman spectrometer

M. Buric, J. Mullen, S. Woodruff, B. Chorpening

Proceedings Volume 8726, 87260K (2013) https://doi.org/10.1117/12.2015948

KEYWORDS: Raman spectroscopy, Waveguides, Capillaries, Calibration, Spectroscopy, Reflectivity, Raman scattering, Signal to noise ratio, Silver, Temperature metrology

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Proceedings Article | 5 March 2013 Paper

Azimuthal polarization for Raman enhancement in capillary waveguides

Jessica Mullen, Michael Buric, Steven Woodruff

Proceedings Volume 8637, 863713 (2013) https://doi.org/10.1117/12.2005168

KEYWORDS: Polarization, Waveguides, Raman spectroscopy, Capillaries, Hollow waveguides, Gases, Spectroscopy, Wave propagation, Spiral phase plates, Metals

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Proceedings Article | 5 May 2012 Paper

Field testing the Raman gas composition sensor for gas turbine operation

Michael Buric, Benjamin Chorpening, Jessica Mullen, Joseph Ranalli, Steven Woodruff

Proceedings Volume 8370, 837009 (2012) https://doi.org/10.1117/12.919666

KEYWORDS: Raman spectroscopy, Capillaries, Sensors, Waveguides, Spectrometers, Calibration, Gas sensors, Gases, Liquids, Ocean optics

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Proceedings Article | 3 June 2011 Paper

Optical efficiency in metal-lined capillary waveguide Raman sensors

S. Biedrzycki, M. Buric, J. Falk, S. Woodruff

Proceedings Volume 8028, 80280K (2011) https://doi.org/10.1117/12.883074

KEYWORDS: Capillaries, Waveguides, Raman spectroscopy, Wave propagation, Metals, Raman scattering, Light scattering, Sensors, Waveguide sensors, Light wave propagation

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Proceedings Article | 28 April 2009 Paper

Raman sensing of fuel gases using a reflective coating capillary optical fiber

M. Buric, K. Chen, J. Falk, R. Velez, S. Woodruff

Proceedings Volume 7316, 731608 (2009) https://doi.org/10.1117/12.818746

KEYWORDS: Capillaries, Raman spectroscopy, Sensors, Gases, Optical fibers, Silver, Methane, Spectroscopy, Fiber lasers, Ocean optics

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Proceedings Article | 5 October 2007 Paper

Transpiration-purged optical probe: a novel sensor for high temperature harsh environments

John VanOsdol, Steve Woodruff, Douglas Straub

Proceedings Volume 6757, 67570C (2007) https://doi.org/10.1117/12.735648

KEYWORDS: Combustion, Ionization, Control systems, Sensors, Particles, Environmental sensing, Optical alignment, Signal processing, Charged particle optics

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Typical control systems that are found in modern power plants must control the many physical aspects of the complex processes that occur inside the various components of the power plant. As detection and monitoring of pollutants becomes increasingly important to plant operation, these control systems will become increasingly complex, and will depend upon accurate monitoring of the concentration levels of the various chemical species that are found in the gas streams. In many cases this monitoring can be done optically. Optical access can also be used to measure thermal emissions and the particulate loading levels in the fluid streams. Some typical environments were optical access is needed are combustion chambers, reactor vessels, the gas and solid flows in fluidized beds, hot gas filters and heat exchangers. These applications all have harsh environments that are at high temperatures and pressures. They are often laden with products of combustion and other fine particulate matter which is destructive to any optical window that could be used to monitor the processes in these environments in order to apply some control scheme over the process. The dust and char that normally collects on the optical surfaces reduces the optical quality and thus impairs the ability of the optical surface to transmit data. Once this has occurred, there is generally no way to clean the optical surface during operation. The probe must be dismounted from the vessel, disassembled and cleaned or replaced, then remounted. This would require the shutdown of the particular component of the plant where optical monitoring is required. This renders the probe ineffective to be used as the monitoring part of any control system application. The components of optical monitoring equipment are usually built in supporting structures that require precise alignment. This is almost always accomplished using fine scale adjustments to specialized mounting hardware that is attached to the reactor vessel. When the temperature of these supporting structures increases due to the high temperature process that is occurring inside the vessel, the optical alignment can often suffer due to the thermal expansion of the mounting structure. This can render them useless especially for gas velocity measurements or other situations where precise optical alignment is required. What is needed is an optical probe that can be inserted into any hazardous environment that will not suffer alignment problems or other failure modes that are related to high temperature dirty environments, and at the same time maintain a clean optical surface through the lifetime of the devise so that it may be continually used for optical inspection or for control system applications. This paper describes details of the construction and the use of a transpiration purged optical probe which mitigates the problems that are outlined above. The transpiration probe may be used as either an emitter or a detector. The probe is implemented in the harsh high temperature environment of the NETL pulsed combustion system where products of combustion and particulate matter have been shown to degrade the performance of a normal optical window. Assessments of combustion heat release are made by monitoring the ultraviolet signatures that are produced by the concentration of OH during a pulsed combustion process. It is shown that these measurements are directly correlated with the pressure within the pulsed combustor. Probe temperature measurements are also presented to show how the probe and its mounting hardware remain at constant temperatures well below the high temperature environment which they monitor.

SPIE Journal Paper | 1 December 2006

Design and characterization of a diode-pumped Nd:YAG retroreflecting slab laser

Steven Woodruff, NarasimhaRao Ayyalasomayajula, Lawrence Hornak

OE, Vol. 45, Issue 12, 124203, (December 2006) https://doi.org/10.1117/12.10.1117/1.2403133

KEYWORDS: Nd:YAG lasers, Semiconductor lasers, Diodes, Mirrors, Transmission electron microscopy, Optical engineering, Laser applications, Retroreflectors, Laser systems engineering, Laser development

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Proceedings Article | 11 January 1999 Paper

Optical diagnostics in gas turbine combustors

Steven Woodruff

Proceedings Volume 3538, (1999) https://doi.org/10.1117/12.335733

KEYWORDS: Combustion, Sensors, Acoustics, Video, Control systems, Diagnostics, Optical diagnostics, Sapphire, Silica, Transducers

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Showing 5 of 12 publications

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