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Van-Dong Pham

Herve Lefevre

Joachim Honthaas

Hervé Lefevre

A fiber-optic measurement device () includes a SAGNAC ring interferometer () having a proper frequency f. The aim is to improve response time while maintaining high precision across the measurement range. Biasing elements () are used to produce: a first biasing phase-differential modulation component &#x394;&#x3c6;(t) () which is periodic in time-slots, having levels +&#x3c0; and &#x2212;&#x3c0;, at a first biasing modulation frequency fsuch that f=(2k+1) f, kbeing a natural number; and a second periodic biasing phase-differential modulation component &#x394;&#x3c6;(t) (), having extreme amplitudes +&#x3c0;/a and &#x2212;&#x3c0;/a, a being a non-zero real number such that |a|&#x3e;1, at a second biasing modulation frequency fsuch that f=(2k+1) f, kbeing a non-zero natural number such that k&#x3e;k. A gyrometer including such a measurement device and a navigation or inertial-stabilization system including at least one such gyrometer are also described.

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Le Kremlin Bicetre, France

Van-Dong Pham