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. 14, 1976
Filed:
Nov. 25, 1974
Gerard Dreyfus, Villebon-sur-Yvette, FR;
Jacques Lewiner, Saint-Cloud, FR;
Abstract
The device measures electrical charges, an electrical voltage or an electrical current, present between two electrodes of which one is fixed and of which the other is mounted so as to be able to vibrate mechanically. One of the two electrodes is connected to ground. Energizing means apply an AC voltage V.sub.o of frequency f.sub.o between the two electrodes. Means are provided for detecting the amplitude of the mechanical vibrations of frequency f.sub.o of the vibrating electrode and means for measuring this amplitude, which is a function of the parameter to be measured. The means for detecting and measuring the amplitude of the mechanical vibrations is a piezo-electric element subject to these vibrations and an apparatus adapted to measure the AC voltage produced.