Guarded capacitance probes for measuring particle concentration and flow
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. 14 figs.
- Research Organization:
- Cornell Univ., Ithaca, NY (United States)
- DOE Contract Number:
- AC22-91PC90183
- Assignee:
- Cornell Research Foundation, Inc., Ithaca, NY (United States)
- Patent Number(s):
- US 5,546,006/A/
- Application Number:
- PAN: 8-509,056
- OSTI ID:
- 288016
- Resource Relation:
- Other Information: PBD: 13 Aug 1996
- Country of Publication:
- United States
- Language:
- English
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Guarded capacitance probes for measuring particle concentration and flow
Guarded capacitance probes for measuring particle concentration and flow