Portable vapor diffusion coefficient meter
Abstract
An apparatus for measuring the effective vapor diffusion coefficient of a test vapor diffusing through a sample of porous media contained within a test chamber. A chemical sensor measures the time-varying concentration of vapor that has diffused a known distance through the porous media. A data processor contained within the apparatus compares the measured sensor data with analytical predictions of the response curve based on the transient diffusion equation using Fick's Law, iterating on the choice of an effective vapor diffusion coefficient until the difference between the predicted and measured curves is minimized. Optionally, a purge fluid can forced through the porous media, permitting the apparatus to also measure a gas-phase permeability. The apparatus can be made lightweight, self-powered, and portable for use in the field.
- Inventors:
-
- Albuquerque, NM
- Issue Date:
- Research Org.:
- Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 909586
- Patent Number(s):
- 7229593
- Application Number:
- 10/280,231
- Assignee:
- Sandia Corporation (Albuquerque, NM)
- Patent Classifications (CPCs):
-
G - PHYSICS G01 - MEASURING G01N - INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
Y - NEW / CROSS SECTIONAL TECHNOLOGIES Y10 - TECHNICAL SUBJECTS COVERED BY FORMER USPC Y10T - TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- DOE Contract Number:
- AC04-94AL85000
- Resource Type:
- Patent
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 47 OTHER INSTRUMENTATION
Citation Formats
Ho, Clifford K. Portable vapor diffusion coefficient meter. United States: N. p., 2007.
Web.
Ho, Clifford K. Portable vapor diffusion coefficient meter. United States.
Ho, Clifford K. Tue .
"Portable vapor diffusion coefficient meter". United States. https://www.osti.gov/servlets/purl/909586.
@article{osti_909586,
title = {Portable vapor diffusion coefficient meter},
author = {Ho, Clifford K},
abstractNote = {An apparatus for measuring the effective vapor diffusion coefficient of a test vapor diffusing through a sample of porous media contained within a test chamber. A chemical sensor measures the time-varying concentration of vapor that has diffused a known distance through the porous media. A data processor contained within the apparatus compares the measured sensor data with analytical predictions of the response curve based on the transient diffusion equation using Fick's Law, iterating on the choice of an effective vapor diffusion coefficient until the difference between the predicted and measured curves is minimized. Optionally, a purge fluid can forced through the porous media, permitting the apparatus to also measure a gas-phase permeability. The apparatus can be made lightweight, self-powered, and portable for use in the field.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2007},
month = {6}
}
Works referenced in this record:
In-Situ Chemiresistor Sensor Package for Real-Time Detection of Volatile Organic Compounds in Soil and Groundwater
journal, January 2002
- Ho, Clifford; Hughes, Robert
- Sensors, Vol. 2, Issue 1
An experimental investigation of air venting of volatile liquid hydrocarbon mixtures from homogeneous and heterogeneous porous media
journal, November 1992
- Ho, Clifford K.; Udell, Kent K.
- Journal of Contaminant Hydrology, Vol. 11, Issue 3-4
A Comparison of Methods for Predicting Gaseous Diffusion Coefficients
journal, July 1965
- Fuller, E. N.; Giddings, J. C.
- Journal of Chromatographic Science, Vol. 3, Issue 7
Analytical Inverse Model for Multicomponent Soil Vapor Extraction
journal, June 1998
- Ho, Clifford K.
- Journal of Environmental Engineering, Vol. 124, Issue 6