Fiber-optic measurement device, gyrometer, and navigation and inertial-stabilization system

A fiber-optic measurement device (10) includes a SAGNAC ring interferometer (20) having a proper frequency fp. The aim is to improve response time while maintaining high precision across the measurement range. Biasing elements (130) are used to produce: a first biasing phase-differential modulation...

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Bibliographic Details
Main Authors HONTHAAS JOACHIM, LEFEVRE HERVE, PHAM VAN-DONG
Format Patent
LanguageEnglish
Published 22.03.2016
Subjects
GYROSCOPIC INSTRUMENTS
MEASURING
MEASURING DISTANCES, LEVELS OR BEARINGS
MEASURING ELECTRIC VARIABLES
MEASURING MAGNETIC VARIABLES
NAVIGATION
PHOTOGRAMMETRY OR VIDEOGRAMMETRY
PHYSICS
SURVEYING
TESTING
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Summary:A fiber-optic measurement device (10) includes a SAGNAC ring interferometer (20) having a proper frequency fp. The aim is to improve response time while maintaining high precision across the measurement range. Biasing elements (130) are used to produce: a first biasing phase-differential modulation component b1(t) (34) which is periodic in time-slots, having levels + and − , at a first biasing modulation frequency fb1 such that fb1=(2k1+1) fp, k1 being a natural number; and a second periodic biasing phase-differential modulation component b2(t) (35), having extreme amplitudes + /a and − /a, a being a non-zero real number such that |a|>1, at a second biasing modulation frequency fb2 such that fb2=(2k2+1) fp, k2 being a non-zero natural number such that k2>k1. A gyrometer including such a measurement device and a navigation or inertial-stabilization system including at least one such gyrometer are also described.
Bibliography:Application Number: US201314379665