MULTIMODE OPTICAL FIBER GYROMETER, WITH IMPROVED RESOLUTION AND STABILITY

摘要

PURPOSE: A multimode optical fiber gyrometer with an improved resolution and stability is provided to supply output which is in proportion to a desired velocity as a rotation speed, in other words, angular displacement for an angle. CONSTITUTION: An optical fiber gyrometer with high stability of scaling factor comprises a light source(2) supplying the two ends of a ring-shaped guide(1) and a sensor(6) receiving the two modal distributions which have traveled along the guide(1) in mutually inverse directions, the values Vdc, V1, and V2 representing the continuous components respectively incoherent, of the fundamental, of the order 1 harmonic and of the optical signal are used for establishing a quotient independent of the fluctuations of the components of the gyrometer and representing the scaling factor. These values are derived for the first detection and for the two others from the synchronous demodulation of the optical signal. The invention is useful for users and manufacturers of gyrometers.