Data processing: measuring – calibrating – or testing – Measurement system in a specific environment – Chemical analysis
Reexamination Certificate
2006-02-21
2006-02-21
Sines, Brian J. (Department: 1743)
Data processing: measuring, calibrating, or testing
Measurement system in a specific environment
Chemical analysis
C436S043000, C436S139000, C436S140000, C436S141000, C422S083000, C422S068100, C700S266000, C702S001000, C702S002000, C702S006000, C702S009000, C702S013000, C702S022000, C702S023000, C702S024000, C702S025000, C702S030000, C702S031000, C073S001010, C073S001020, C073S023200
Reexamination Certificate
active
07003405
ABSTRACT:
An inverse analysis method for characterizing diffusion of vapor from an underground source of volatile contaminant using data taken by an in-situ sensor. The method uses one-dimensional solutions to the diffusion equation in Cartesian, cylindrical, or spherical coordinates for isotropic and homogenous media. If the effective vapor diffusion coefficient is known, then the distance from the source to the in-situ sensor can be estimated by comparing the shape of the predicted time-dependent vapor concentration response curve to the measured response curve. Alternatively, if the source distance is known, then the effective vapor diffusion coefficient can be estimated using the same inverse analysis method. A triangulation technique can be used with multiple sensors to locate the source in two or three dimensions. The in-situ sensor can contain one or more chemiresistor elements housed in a waterproof enclosure with a gas permeable membrane.
REFERENCES:
patent: 5264368 (1993-11-01), Clarke et al.
patent: 5343771 (1994-09-01), Turriff et al.
patent: 5517868 (1996-05-01), Turriff et al.
patent: 5723769 (1998-03-01), Barber et al.
patent: 5773713 (1998-06-01), Barber et al.
patent: 5786527 (1998-07-01), Tarte
patent: 5992213 (1999-11-01), Tartre
patent: 6289714 (2001-09-01), Tartre
Ho and Hughes, “In-Situ Chemiresistor Package for Real-Time Detection of Volatile Organic Compounds in Soil and Groundwater”, Jan. 30, 2002, pp. 23-34.
Ho, Itamura, Kelley and Hughes, “Review of Chemical Sensors for In-Situ Monitoring of Volatile Contaminants”, Mar. 2001 pp. 1-28.
Ho and Udell, “An experimental investigation of air venting of volatile liquid hydrocarbon mistures from homogeneous and heterogeneous porous media”, Apr. 27, 1992, pp. 289-315.
Ho, “Analytical Inverse Model for Multicomponent Soil Vapor Extraction”, Jun. 1998, pp. 504-507.
Ho, Hughes and Jenkins, “Waterproof Microsensor for In-Situ Monitoring of Volatile Compounds”, Patent Application, pp. 1-39.
Ho, “Automated Monitoring and Remediation System for Volatile Subsurface Contaminants”, Provisional Application, Jan. 23, 2002, pp. 1-10.
Ho, “Characterization Methods for Real-Time In-Situ Sensing of Volatile Contaminants”, Provisional Application, Oct. 23, 2001, pp. 1-55.
Milligan, R. J. “Gas Diffusion in Porous Medi, Science”, 1959, 130, 100-102.
Fuller, E. N. Schettler, P. D. and Giddings, J.C., “A Comparison of Methods for Predicting Gaseous Diffusion Coefficents,” J. Gas Chromatography 1965, 220227.
Sandia Corporation
Sines Brian J.
Watson Robert D.
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