Guarded capacitance probes for measuring particle concentration and flow
Abstract
Guarded capacitance probe structures are constructed with guard electrodes surrounding one or more sensor electrodes and ground electrodes or grounded surfaces surrounding the guard electrodes. In a one sensor embodiment, the probe utilizes an apertured sensor electrode and the guard electrode both surrounds the sensor electrode and fills the aperture. This embodiment is particularly useful for measuring particle concentration in a fluid suspension contained within a vessel or pipe. The portion of the guard electrode within the aperture of the sensor electrode prevents electric field lines from emanating from the sensor electrode into the fluid suspension and toward infinity. A two sensor embodiment of the probe is useful for measuring flow velocities of fluid suspensions through cross correlation of the outputs generated by each sensor. The relative dimensions of the guard and sensor electrodes are selected to provide the most accurate measurements by confining the electric lines emanating from the sensor electrode or electrodes and terminating on the surrounding grounded surfaces to a small measurement volume of the fluid suspension near the vessel or pipe wall.
- Inventors:
-
- Ithaca, NY
- Issue Date:
- Research Org.:
- Cornell Univ., Ithaca, NY (United States)
- OSTI Identifier:
- 870121
- Patent Number(s):
- 5459406
- Assignee:
- Cornell Research Foundation, Inc. (Ithaca, NY)
- Patent Classifications (CPCs):
-
G - PHYSICS G01 - MEASURING G01F - MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL
G - PHYSICS G01 - MEASURING G01N - INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- DOE Contract Number:
- AC22-91PC90183
- Resource Type:
- Patent
- Country of Publication:
- United States
- Language:
- English
- Subject:
- guarded; capacitance; probes; measuring; particle; concentration; flow; probe; structures; constructed; guard; electrodes; surrounding; sensor; ground; grounded; surfaces; embodiment; utilizes; apertured; electrode; surrounds; fills; aperture; particularly; useful; fluid; suspension; contained; vessel; pipe; portion; prevents; electric; field; lines; emanating; infinity; velocities; suspensions; correlation; outputs; generated; relative; dimensions; selected; provide; accurate; measurements; confining; terminating; measurement; volume; near; wall; accurate measurements; flow velocities; probe utilizes; guard electrode; sensor electrode; field lines; electric field; particularly useful; ground electrode; particle concentration; measuring particle; accurate measurement; surrounding grounded; surfaces surrounding; capacitance probe; prevents electric; outputs generated; measuring flow; sensor electrodes; guarded capacitance; guard electrodes; grounded surfaces; pipe wall; ground electrodes; electrodes surrounding; accurate measure; surrounding ground; rate measurements; capacitance probes; probe structures; /324/361/
Citation Formats
Louge, Michel Y. Guarded capacitance probes for measuring particle concentration and flow. United States: N. p., 1995.
Web.
Louge, Michel Y. Guarded capacitance probes for measuring particle concentration and flow. United States.
Louge, Michel Y. Sun .
"Guarded capacitance probes for measuring particle concentration and flow". United States. https://www.osti.gov/servlets/purl/870121.
@article{osti_870121,
title = {Guarded capacitance probes for measuring particle concentration and flow},
author = {Louge, Michel Y},
abstractNote = {Guarded capacitance probe structures are constructed with guard electrodes surrounding one or more sensor electrodes and ground electrodes or grounded surfaces surrounding the guard electrodes. In a one sensor embodiment, the probe utilizes an apertured sensor electrode and the guard electrode both surrounds the sensor electrode and fills the aperture. This embodiment is particularly useful for measuring particle concentration in a fluid suspension contained within a vessel or pipe. The portion of the guard electrode within the aperture of the sensor electrode prevents electric field lines from emanating from the sensor electrode into the fluid suspension and toward infinity. A two sensor embodiment of the probe is useful for measuring flow velocities of fluid suspensions through cross correlation of the outputs generated by each sensor. The relative dimensions of the guard and sensor electrodes are selected to provide the most accurate measurements by confining the electric lines emanating from the sensor electrode or electrodes and terminating on the surrounding grounded surfaces to a small measurement volume of the fluid suspension near the vessel or pipe wall.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Sun Jan 01 00:00:00 EST 1995},
month = {Sun Jan 01 00:00:00 EST 1995}
}
Works referenced in this record:
Measurements of voidage near the wall of a circulating fluidized bed riser
journal, September 1990
- Louge, M.; Lischer, D. J.; Chang, Hongder
- Powder Technology, Vol. 62, Issue 3
Optical fiber measurements of particle concentration in dense suspensions: calibration and simulation
journal, January 1992
- Lischer, D. Jeffrey; Louge, Michel Y.
- Applied Optics, Vol. 31, Issue 24