Dr. Mark J. Thomas Profile

Dr. Mark J. Thomas

at US Environmental Protection Agency

SPIE Involvement:

Author

Publications (18)

Proceedings Article | 15 October 2012 Paper

Low-cost near-real-time automated geo-registration of commercial-off-the-shelf (COTS) digital camera and spectrometer sensor data with camera link standard data streams

Tim Bratcher, Robert Kroutil, Paul Lewis, David Miller, Sylvia Shen, Mark Thomas

Proceedings Volume 8515, 85150C (2012) https://doi.org/10.1117/12.928962

KEYWORDS: Cameras, Sensors, Imaging systems, Optical filters, Digital cameras, Commercial off the shelf technology, Image processing, Power supplies, Data acquisition, Global Positioning System

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Proceedings Article | 25 August 2010 Paper

Airborne remote sensing for Deepwater Horizon oil spill emergency response

Robert Kroutil, Sylvia Shen, Paul Lewis, David Miller, John Cardarelli, Mark Thomas, Timothy Curry, Paul Kudaraskus

Proceedings Volume 7812, 78120E (2010) https://doi.org/10.1117/12.863258

KEYWORDS: Infrared radiation, Infrared imaging, Infrared spectroscopy, Multispectral imaging, Sensors, Combustion, Infrared sensors, Airborne remote sensing, Environmental monitoring, Environmental sensing

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Proceedings Article | 13 August 2010 Paper

Environmental Protection Agency (EPA) airborne gamma spectrometry system for environmental and emergency response surveys

John Cardarelli, Mark Thomas, Timothy Curry

Proceedings Volume 7812, 781205 (2010) https://doi.org/10.1117/12.863314

KEYWORDS: Sensors, Radon, Gamma radiation, Spectroscopy, Global Positioning System, Uranium, Crystals, Soil science, Homeland security, Calibration

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Proceedings Article | 12 September 2007 Paper

Preliminary assessment of the utility of airborne infrared spectroscopic analysis of emissions from a variety of flooded areas in the United States

Robert Kroutil, Paul Lewis, Mark Thomas, Dave Miller, Sylvia Shen, Tim Curry

Proceedings Volume 6661, 66610K (2007) https://doi.org/10.1117/12.737093

KEYWORDS: FT-IR spectroscopy, Infrared spectroscopy, Infrared radiation, Spectroscopy, Sensors, Infrared detectors, Long wavelength infrared, Absorption, Chemical analysis, Infrared imaging

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Proceedings Article | 25 October 2006 Paper

Gas-cell measurements for evaluating longwave-infrared passive-sensor performance

Alan Cummings, Roger Combs, Mark Thomas, Timothy Curry, Robert Kroutil

Proceedings Volume 6378, 63780M (2006) https://doi.org/10.1117/12.675961

KEYWORDS: Absorbance, Chlorine, Spectroscopy, FT-IR spectroscopy, Black bodies, Long wavelength infrared, Temperature metrology, Nitrogen, Interferometers, Solids

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Proceedings Article | 1 September 2006 Paper

A Fourier transform spectrometer generic scan mechanism controller (GSMC): improves instrument utility and flexibility for a variety of applications

Luc Rochette, Paul Lewis, Tim Bratcher, Mark Thomas, Guy St-Pierre

Proceedings Volume 6302, 630203 (2006) https://doi.org/10.1117/12.683277

KEYWORDS: Fourier transforms, Digital signal processing, Spectroscopy, Data acquisition, Sensors, Interferometers, Control systems, Analog electronics, Signal detection, Field programmable gate arrays

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Proceedings Article | 4 May 2006 Paper

Airborne mapping of chemical plumes in the aftermath of Hurricanes Katrina and Rita

Paul Lewis, Mark Thomas, Robert Kroutil, Roger Combs, Alan Cummings, Dave Miller, Tim Curry, Sylvia Shen

Proceedings Volume 6233, 62331X (2006) https://doi.org/10.1117/12.669802

KEYWORDS: Sensors, Infrared radiation, Spectroscopy, Infrared imaging, Infrared sensors, FT-IR spectroscopy, Infrared spectroscopy, Optical filters, Industrial chemicals, Imaging systems

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Proceedings Article | 10 November 2005 Paper

A purged-gas containment cell for infrared absorbance measurements

Roger Combs, Alan Cummings, Mark Thomas, Robert Kroutil

Proceedings Volume 5994, 59940S (2005) https://doi.org/10.1117/12.629757

KEYWORDS: Absorbance, Black bodies, Spectrometers, FT-IR spectroscopy, Solids, Infrared radiation, Statistical analysis, Absorption, Methane, Nitrogen

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Proceedings Article | 1 June 2005 Paper

A portable vapor cell for passive FT-IR spectrometer evaluation

Roger Combs, Alan Cummings, Mark Thomas, Robert Kroutil

Proceedings Volume 5806, (2005) https://doi.org/10.1117/12.605272

KEYWORDS: Absorbance, Spectroscopy, FT-IR spectroscopy, Black bodies, Infrared spectroscopy, Binary data, Temperature metrology, Signal to noise ratio, Liquids, Sensors

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Proceedings Article | 12 August 2004 Paper

Encapsulation of the U.S. Environmental Protection Agency (EPA) standoff chemical detection requirements for commercial sensor system developers

Paul Lewis, Mark Thomas, David Miller, Paul Olsen, Timothy Curry

Proceedings Volume 5425, (2004) https://doi.org/10.1117/12.546623

KEYWORDS: Sensors, Spectroscopy, Long wavelength infrared, Environmental sensing, Spectral resolution, Chemical analysis, Chemical detection, Databases, Lanthanum, Calibration

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Proceedings Article | 7 January 2004 Paper

Rationale and methodology for generating an airborne emergency response spectral reference library

Mark Thomas

Proceedings Volume 5159, (2004) https://doi.org/10.1117/12.509824

KEYWORDS: Data processing, Sensors, Databases, Chemical analysis, Scanners, Infrared radiation, FT-IR spectroscopy, Infrared imaging, Infrared spectroscopy, Spectroscopy

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Proceedings Article | 2 August 2002 Paper

Infrared detection and analysis of vapor plumes using an airborne sensor

Mark Thomas, Paul Lewis, Robert Kroutil, Roger Combs, Gary Small, Randall Zywicki, Dale Stageberg, Charles Chaffin, Timothy Marshall

Proceedings Volume 4725, (2002) https://doi.org/10.1117/12.478784

KEYWORDS: FT-IR spectroscopy, Infrared imaging, Infrared detection, Infrared sensors, Sensors, Infrared spectroscopy, Spectroscopy, Hyperspectral imaging, Infrared radiation, Surveillance

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Proceedings Article | 31 January 1994 Paper

Fourier transform spectroscopy: from organizing MISFITS to FTing it in a truck

Wanda Fateley, Robert Hammaker, Martin Spartz, Mark Witkowski, Timothy Marshall, Charles Chaffin, M. Tucker, John Poholarz, V. Makepeace, Billy Fairless, Jody Hudson, Joseph Arello, Mark Thomas

Proceedings Volume 2089, (1994) https://doi.org/10.1117/12.166640

KEYWORDS: Spectroscopy, FT-IR spectroscopy, Infrared spectroscopy, Fourier transforms, Fourier spectroscopy, Infrared radiation, Physics, Far infrared, Spectral calibration, Calibration

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Proceedings Article | 31 January 1994 Paper

Using on-site structures that exhibit elevated temperatures as sources in FTIR remote sensing

M. Tucker, Charles Chaffin, William Fateley, Robert Hammaker, Mark Thomas, Joseph Arello, John Helvig, Billy Fairless

Proceedings Volume 2089, (1994) https://doi.org/10.1117/12.166584

KEYWORDS: Infrared radiation, FT-IR spectroscopy, Signal to noise ratio, Nitrous oxide, Absorbance, Calibration, Remote sensing, Agriculture, Spectral calibration, Chemical elements

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Proceedings Article | 10 March 1993 Paper

Assessment of data intercomparability and data quality for multiple open-path FTIR systems

Jody Hudson, Mark Thomas, John Helvig, Billy Fairless, Ray Carter, Dennis Lane, Glen Marotz

Proceedings Volume 1717, (1993) https://doi.org/10.1117/12.140297

KEYWORDS: FT-IR spectroscopy, Spectral calibration, Calibration, Precision measurement, Statistical analysis, Retroreflectors, System identification, Infrared spectroscopy, Spectroscopy, Environmental sensing

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Proceedings Article | 1 May 1992 Paper

Art of atmospheric monitoring

William Fateley, Mark Witkowski, Charles Chaffin, Timothy Marshall, Robert Hammaker, Ray Carter, Dennis Lane, Glen Marotz, Billy Fairless, T. Holloway, Jody Hudson, Joseph Arello, Mark Thomas, D. Gurka

Proceedings Volume 1637, (1992) https://doi.org/10.1117/12.59324

KEYWORDS: Absorbance, Infrared radiation, Environmental monitoring, FT-IR spectroscopy, Calibration, Interferometers, Spectral calibration, Telescopes, Silicon, Mirrors

Proceedings Article | 1 March 1992 Paper

Testing and development of a mobile Fourier transform infrared spectrometer system for the analysis of atmospheric pollutants

Mark Witkowski, Charles Chaffin, Timothy Marshall, Martin Spartz, Jonathan Fateley, Robert Hammaker, William Fateley, Ray Carter, Dennis Lane, Glen Marotz, Billy Fairless, Jody Hudson, Joseph Arello, Mark Thomas, D. Gurka

Proceedings Volume 1575, (1992) https://doi.org/10.1117/12.56435

KEYWORDS: Spectroscopy, FT-IR spectroscopy, Infrared spectroscopy, Fringe analysis, Infrared radiation, Reflectors, Collimation, Infrared detectors, Optical filters, Silicon

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Proceedings Article | 1 November 1990 Paper

Optimization of a Fourier transform infrared spectrometer during on-site pollution analysis

Martin Spartz, Mark Witkowski, Jonathan Fateley, Robert Hammaker, William Fateley, Ray Carter, Mark Thomas, Dennis Lane, Glen Marotz, Billy Fairless, T. Holloway, Jody Hudson, Joseph Arello, D. Gurka

Proceedings Volume 1336, (1990) https://doi.org/10.1117/12.22914

KEYWORDS: Spectroscopy, Absorbance, Raman spectroscopy, FT-IR spectroscopy, Infrared spectroscopy, Data acquisition, Infrared radiation, Telescopes, Calibration, Infrared telescopes

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The field transportable Fourier transform infrared (FT-IR) spectrometer system developed at Kansas State University is now finishing the testing stage. The testing stage consisted of three parts: the measurements of (1) controlled releases of volatile organic compounds (VOC), (2) uncontrolled VOC releases at well documented sites, and (3) uncontrolled VOC releases at complex sites with little or no precharacterization1. Some measurements have been acquired in all three categories with most of the data acquisition taking place in the first two categories, which are discussed in these proceedings. These tests were developed to validate the qualitative and quantitative capabilities while enhancing the versatility and detection limits of the spectrometer system. The controlled VOC releases, for the most part, took place at the University of Kansas (KU). The KU tests utilized a co-monitoring technique, evacuated stainless steel canisters followed by GC/FID analysis, during the acquisition of the infrared data. The ability to monitor the concentrations of the released plume with another technique allowed for the comparison and examination of how varying parameters can affect the infrared spectrometer technique. The varying parameters that were addressed were wind, path length, temperature, barometric pressure, water and carbon dioxide concentration, and air borne particulates. One set of uncontrolled releases occurred at an active production facility. A list of the possible compounds that might be observed from the facility directly due to production was obtained. Infrared measurements were acquired at two different setup geometries down wind and one setup geometry up wind. The three path lengths were 390 meters, 500 meters, and 412 meters respectively. During these measurements two series of canister samples were obtained down wind and one series of canister samples were obtained up wind. The analyses of these canisters, on-going at this writing, is being performed by GC/FT-IR (matrix isolation). When the analysis from this method is complete the results will be compared. These two different data acquisitions have led to much insight into the capabilities of the spectrometer system and how varying parameters can affect the FT-IR spectrometer's performance. Preliminary analysis of the spectroscopic data from both data acquisitions will be discussed.

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