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:
Aug. 22, 2017
Filed:
Apr. 25, 2013
Ixblue, Marly le Roi, FR;
Herve Lefevre, Paris, FR;
Frederic Guattari, Aubervilliers, FR;
Cedric Molucon, Saint Germain en Laye, FR;
Eric Ducloux, Rueil Malmaison, FR;
Sebastien Ferrand, Paris, FR;
IXBLUE, Saint-Germain, FR;
Abstract
A fiber-optic measurement device () includes a SAGNAC ring interferometer () having a proper frequency f, a detector () and a modulation chain () generating a phase-shift modulation φ(t) between the two counter-propagating waves () propagating in the ring interferometer. The device aims to reduce measurement faults due to the linearity defects in the modulation chain of such a measurement device with optical fiber. For this reason, the fiber-optic measurement device reduces the amplitude of the phase-shift modulation φ(t) which is the sum of a first biasing phase-shift modulation component φ(t) and a first counter-reaction phase-shift modulation component φ(t), the phase-shift modulation φ(t) falling or rising by twice the amplitude of the first biasing phase-shift modulation component φ(t). A rate gyro including such a measurement device and an inertial stabilization or navigation unit including at least one such rate gyro are also described.