Seth David Humphries
Montana State University
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Featured researches published by Seth David Humphries.
Applied Optics | 2008
Seth David Humphries; Amin R. Nehrir; Charlie Keith; Kevin S. Repasky; Laura M. Dobeck; John L. Carlsten; Lee H. Spangler
Two laser-based instruments for carbon sequestration site monitoring have been developed and tested at a controlled carbon dioxide (CO(2)) release facility. The first instrument uses a temperature tunable distributed feedback (DFB) diode laser capable of accessing the 2.0027-2.0042 microm spectral region that contains three CO(2) absorption lines and is used for aboveground atmospheric CO(2) concentration measurements. The second instrument also uses a temperature tunable DFB diode laser capable of accessing the 2.0032-2.0055 mum spectral region that contains five CO(2) absorption lines for underground CO(2) soil gas concentration measurements. The performance of these instruments for carbon sequestration site monitoring was studied using a newly developed controlled CO(2) release facility. A 0.3 ton CO(2)/day injection experiment was performed from 3-10 August 2007. The aboveground differential absorption instrument measured an average atmospheric CO(2) concentration of 618 parts per million (ppm) over the CO(2) injection site compared with an average background atmospheric CO(2) concentration of 448 ppm demonstrating this instruments capability for carbon sequestration site monitoring. The underground differential absorption instrument measured a CO(2) soil gas concentration of 100,000 ppm during the CO(2) injection, a factor of 25 greater than the measured background CO(2) soil gas concentration of 4000 ppm demonstrating this instruments capability for carbon sequestration site monitoring.
Review of Scientific Instruments | 2006
Kevin S. Repasky; Seth David Humphries; John L. Carlsten
The design and performance of an absorption measurement instrument for monitoring carbon dioxide are presented. The instrument is based on a temperature tunable distributed feedback diode laser capable of tuning between 2.001 and 2.005μm. Within this wavelength range are 12 absorption lines for carbon dioxide and 9 absorption lines for water vapor. Initial measurements of laser transmission as a function of carbon dioxide concentration are made using a 2m long absorption cell. The measured values compare well with the expected values using the known line strength of the carbon dioxide absorption feature. Carbon dioxide measurements over a 77.5m path length made outside the laboratory show the potential for carbon dioxide concentration monitoring.
Environmental Earth Sciences | 2010
Lee H. Spangler; Laura M. Dobeck; Kevin S. Repasky; Amin R. Nehrir; Seth David Humphries; Jamie L. Barr; Charlie Keith; Joseph A. Shaw; Joshua H. Rouse; Alfred B. Cunningham; Sally M. Benson; Curtis M. Oldenburg; Jennifer L. Lewicki; Arthur W. Wells; J. Rodney Diehl; Brian R. Strazisar; Julianna Eileen Fessenden; Thom Rahn; James E. Amonette; Jon L. Barr; W. L. Pickles; James Jacobson; Eli A. Silver; E. J. Male; Henry W. Rauch; Kadie Gullickson; Robert C. Trautz; Yousif K. Kharaka; Jens T. Birkholzer; Lucien Wielopolski
Energy Procedia | 2009
Lee H. Spangler; Laura M. Dobeck; Kevin S. Repasky; Amin R. Nehrir; Seth David Humphries; Jamie L. Barr; Charlie Keith; Joe Shaw; Josh Rouse; Al Cunningham; Sally M. Benson; Curtis M. Oldenburg; Jennifer L. Lewicki; Art Wells; Rod Diehl; Brian R. Strazisar; Julianna Eileen Fessenden; Thom Rahn; James E. Amonette; Jon L. Barr; W. L. Pickles; James Jacobson; Eli A. Silver; E. J. Male; Henry W. Rauch; Kadie Gullickson; Robert C. Trautz; Youssif Kharaka; Jens T. Birkholzer; Lucian Wielopolski
International Journal of Greenhouse Gas Control | 2011
Jamie L. Barr; Seth David Humphries; Amin R. Nehrir; Kevin S. Repasky; Laura M. Dobeck; John L. Carlsten; Lee H. Spangler
Archive | 2011
J. Lasue; Roger C. Wiens; Samuel Michael Clegg; D. T. Vaniman; K. H. Joy; Seth David Humphries
Archive | 2011
Seth David Humphries; D. T. Vaniman; Shiv K. Sharma; David E. Bates; Anupam K. Misra; Roger C. Wiens; Rhonda McInroy; Samuel Michael Clegg
Archive | 2010
Seth David Humphries; Samuel Michael Clegg; Thomas A. Rahn; Julianna Eileen Fessenden; Laura M. Dobeck; Lee H. Spangler; Travis L. McLing
Archive | 2010
Seth David Humphries; J. M. Tucker; Rhonda McInroy; Stephen J Obrey; Roger C. Wiens; M. Darby Dyar; Samuel Michael Clegg
Archive | 2009
Julianna Eileen Fessenden; Samuel Michael Clegg; Seth David Humphries; Laura M. Dobeck; Lee H. Spangler