Accession Number : ADD015448
Title : Contamination Capacitance Probe System.
Descriptive Note : Patent, Filed 9 Oct 90, patented 30 Jun 92,
Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC
Personal Author(s) : O'Connell, Thomas A ; Frank, Thomas A
Report Date : 30 Jun 1992
Pagination or Media Count : 5
Abstract : A contamination capacitance probe system is disclosed that capacitively monitors whether or not two or more fluids or materials that have to remain separated have been mixed or mingled and that provides First and second control signals respectively representative of the unmingled and mingled condition. The system includes a capacitance sensor constituted by spaced-apart first and second capacitor plates of preselected size and spacing. The plate size and spacing is selected to render negligible any effect that the different materials or fluids or materials might have on the capacitance of the sensor. Circuit means are disclosed that includes a capacitance to frequency convertor, a frequency to voltage convertor, and a Schmidt trigger operative to provide the first and second control signals. The contamination capacitance probe system of the present invention is operable with any two or more fluids or materials having different dielectric constants and that are either immiscible or miscible.
Descriptors : *CAPACITANCE, *CONTAMINATION, *MONITORS, *PATENTS, CAPACITORS, CIRCUITS, CONSTANTS, CONTROL, DIELECTRICS, FLUIDS, MATERIALS, PLATES, PROBES, SIGNALS, VOLTAGE, FREQUENCY
Subject Categories : Electrical and Electronic Equipment
Environmental Health and Safety
Distribution Statement : APPROVED FOR PUBLIC RELEASE