Capacitive sensor for measurement of a fuel wall film, particularly in an intake duct of an internal combustion engine
Patent 5175505 Issued on December 29, 1992. Estimated Expiration Date: 
September 26, 2011. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
September 26, 2011. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3739265 3775277 Methods and apparatus for microdielectrometry Patent #: 4423371 InventorsAssigneeApplicationNo. 766444 filed on 09/26/1991US Classes:324/671, To determine dimension (e.g., dielectric thickness)73/304C, Capacitative324/678, Including charge or discharge cycle circuit324/687, Having fringing field coupling324/688Including a guard or ground electrodeExaminersPrimary: Wieder, Kenneth A.Assistant: Solis, Jose M. Attorney, Agent or FirmInternational ClassesG01D 005/24G01B 007/04 G02D 041/00 Foreign Application Priority Data1990-10-04 DEAbstractA capacitive sensor includes a plurality of individual condenser elements, each of which consist of a first, preferably circular, electrode and a second, preferably surrounding ring-shaped, electrode, which are mounted on one side of a nonconducting support. A common conductor is connected to each of the first electrodes of condenser elements. A signal can be detected separately from each of the condenser elements via conductors connected separately to the individual second electrodes. To increase the sensitivity and to avoid interference, the remote side of the support opposite to the one side is provided with a third additional electrode, which is at ground potential and also acts as a shield for interfering couplings. The sensor is used for measurement of the fuel film thickness in the intake of an internal combustion engine. | |
