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:
Mar. 22, 1977
Filed:
Jun. 25, 1975
Michel G Berniere, 78430 Louveciennes, FR;
Didier M Beaudet, 94100 Saint-Maur des Fosses, FR;
Other;
Abstract
A method of measuring and, where necessary, modifying the natural vibration frequency of a metal bar, more especially a ferromagnetic bar, comprising freely suspending the bar in a constant magnetic field, subjecting the bar to action from outside to make it vibrate and detecting the resulting vibration frequency. There is also provided apparatus for carrying out the method, which comprises a vertical insulating cylinder, at the center of which the bar is kept freely suspended by a pneumatic device, means intended to make the bar vibrate, a solenoid which establishes a constant magnetic field and at the terminals of which the vibration frequency of the bar is detected, and a selective amplifier connected to the terminals of the solenoid.