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:
Apr. 20, 1993
Filed:
Dec. 03, 1991
Applicant:
Inventors:
Ge Beigbeder, Paris, FR;
Vincent Michoud, Paris, FR;
Assignee:
Sextant Avionique, Meudon La Foret, FR;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G01P / ; G01P / ;
U.S. Cl.
CPC ...
324174 ; 324175 ; 324262 ; 3242441 ; 25023114 ; 25022717 ;
Abstract
A device for measuring the rotational speed of a shaft. A toothed wheel is connected to rotate with the shaft within a magnetic field. A birefringement optic fiber is connected to a light source, and passes through the magnetic field. A magnetorestrictive material is supported in contact with the optical fiber and produces stress on the optical fiber in response to magnetic flux variations. Light emerging from the optical fiber is analyzed with respect to its change in phase to determine the periodic variation in the magnetic field caused by the toothed wheel.