Capacitance measurements of the volume fraction and velocity of dielectric solids near a grounded wall
- Sibley School of Mechanical and Aerospace Engineering, Cornell University, Ithaca, New York 14853 (United States)
We describe capacitance probes that infer the volume fraction of solids near a grounded wall from a measurement of the effective dielectric constant of the suspension. The probes consist of three conductors, namely the sensor, guard, and ground surfaces. The instrument records capacitance between the sensor and ground by supplying an oscillating current of constant amplitude to the sensor. A control circuit maintains the guard and sensor voltages equal without affecting the sensor circuit. Because it surrounds the sensor conductor everywhere except at the probe surface, the guard eliminates stray and cable capacitances. By locating the ground at the periphery of the probe, this configuration renders the new instrument particularly useful in metallic vessels. Cross-correlation of the signals from two adjacent capacitance probes also permits measurements of the velocity of dielectric solids. {copyright} {ital 1996 American Institute of Physics.}
- DOE Contract Number:
- AC22-91PC90183
- OSTI ID:
- 284109
- Journal Information:
- Review of Scientific Instruments, Vol. 67, Issue 5; Other Information: PBD: May 1996
- Country of Publication:
- United States
- Language:
- English
Similar Records
Guarded capacitance probes for measuring particle concentration and flow
Guarded capacitance probes for measuring particle concentration and flow