The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 02, 1976
Filed:
Sep. 03, 1974
Robert C Abbe, Newton, MA (US);
Noel S Poduje, Needham Heights, MA (US);
Ade Corporation, Watertown, MA (US);
Abstract
A system for capacitively gauging distance to an element which is not in a low impedance path to ground. The gauging system operates to provide an indication of distance with the potential on the element at a defined level, typically ground. Several embodiments are presented for making this measurement. A first operates to measure distance at periodic instances when the defined potential exists. A second embodiment uses phase opposite excitation to produce a defined potential at the element either by specific placement of the element or through a feedback control over element potential. The system of the present invention may be adapted for use in capacitive thickness measurement on an ungrounded or highly resistive element.