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:
Dec. 20, 1977
Filed:
Dec. 02, 1975
Jacques Lewiner, Saint-Cloud, FR;
Gerard Dreyfus, Palatseau, FR;
Agence Nationale de Valorisation de la Recherche, Neuilly-sur-Seine, FR;
Abstract
A device for measuring quantities of electric charges, or other electric parameters whose magnitudes can be obtained from measurements of quantities of electric charges. The device includes a capacitor having a measuring plate and another plate or an intermediate element. The electrical parameter is applied to the capacitor so that a charge representative of its magnitude is induced on the measuring plate. This induced charge is modulated at a frequency f.sub.o and at a frequency f.sub.1, the frequency f.sub.1 being less than f.sub.o /2. An electrical signal representative of the modulation of the induced charge is generated. This signal has a first component of frequency f.sub.o whose magnitude represents the quantity of the induced charge and a second component of frequency f.sub.1 whose magnitude varies according to the distance between the measuring plate and the location at which the electrical parameter is applied to the capacitor. The second component can be used as a correction signal which reduces errors due to changes in the said distance.