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Title: Composition pulse time-of-flight mass flow sensor

Abstract

A device for measuring fluid flow rates over a wide range of flow rates (<1 nL/min to >10 .mu.L/min) and at pressures at least as great as 2,000 psi. The invention is particularly adapted for use in microfluidic systems. The device operates by producing compositional variations in the fluid, or pulses, that are subsequently detected downstream from the point of creation to derive a flow rate. Each pulse, comprising a small fluid volume, whose composition is different from the mean composition of the fluid, can be created by electrochemical means, such as by electrolysis of a solvent, electrolysis of a dissolved species, or electrodialysis of a dissolved ionic species. Measurements of the conductivity of the fluid can be used to detect the arrival time of the pulses, from which the fluid flow rate can be determined. A pair of spaced apart electrodes can be used to produce the electrochemical pulse. In those instances where it is desired to measure a wide range of fluid flow rates a three electrode configuration in which the electrodes are spaced at unequal distances has been found to be desirable.

Inventors:
 [1];  [2];  [3];  [4];  [1]
  1. Livermore, CA
  2. Fremont, CA
  3. San Francisco, CA
  4. Berkeley, CA
Publication Date:
Research Org.:
Sandia National Lab. (SNL-CA), Livermore, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
909523
Patent Number(s):
7,225,683
Application Number:
10/661,401
Assignee:
Sandia National Laboratories (Livermore, CA)
DOE Contract Number:  
AC04-94AL85000
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
47 OTHER INSTRUMENTATION

Citation Formats

Harnett, Cindy K, Crocker, Robert W, Mosier, Bruce P, Caton, Pamela F, and Stamps, James F. Composition pulse time-of-flight mass flow sensor. United States: N. p., 2007. Web.
Harnett, Cindy K, Crocker, Robert W, Mosier, Bruce P, Caton, Pamela F, & Stamps, James F. Composition pulse time-of-flight mass flow sensor. United States.
Harnett, Cindy K, Crocker, Robert W, Mosier, Bruce P, Caton, Pamela F, and Stamps, James F. Tue . "Composition pulse time-of-flight mass flow sensor". United States. https://www.osti.gov/servlets/purl/909523.
@article{osti_909523,
title = {Composition pulse time-of-flight mass flow sensor},
author = {Harnett, Cindy K and Crocker, Robert W and Mosier, Bruce P and Caton, Pamela F and Stamps, James F},
abstractNote = {A device for measuring fluid flow rates over a wide range of flow rates (<1 nL/min to >10 .mu.L/min) and at pressures at least as great as 2,000 psi. The invention is particularly adapted for use in microfluidic systems. The device operates by producing compositional variations in the fluid, or pulses, that are subsequently detected downstream from the point of creation to derive a flow rate. Each pulse, comprising a small fluid volume, whose composition is different from the mean composition of the fluid, can be created by electrochemical means, such as by electrolysis of a solvent, electrolysis of a dissolved species, or electrodialysis of a dissolved ionic species. Measurements of the conductivity of the fluid can be used to detect the arrival time of the pulses, from which the fluid flow rate can be determined. A pair of spaced apart electrodes can be used to produce the electrochemical pulse. In those instances where it is desired to measure a wide range of fluid flow rates a three electrode configuration in which the electrodes are spaced at unequal distances has been found to be desirable.},
doi = {},
url = {https://www.osti.gov/biblio/909523}, journal = {},
number = ,
volume = ,
place = {United States},
year = {2007},
month = {6}
}

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