G - Physics – 01 – C
Patent
G - Physics
01
C
G01C 19/66 (2006.01) G01C 19/72 (2006.01)
Patent
CA 2086458
A fibre-optic gyroscope is provided herein which includes a polarizer, a fibre coil and couplers. A light beam is polarized, divided into two beams and introduced into the fibre coil. Two depolarizers are provided, one being provided between a light source and a polarizer, the other being provided between the fibre coil and a coupler. Four birefringent materials A, B, C and D should satisfy inequalities: ¦ PaBaLa + PbBbLb + PcBcLc + PdBdLd ¦ - BsLs > C where Pa, Pb, Pc, and Pd are triplet factors which may be one of -1, 0 or +1 independently, Ba, Bb, BC and Bd are birefrin- gence La, Lb, Lc and Ld are lengths of A, B, C and D, and B?L5 is the extra birefringency of the fibre coil or couplers. By these means, the condition for avoiding interference between two depolarizers is clarified.
Nishi Yasuhiko
Nishiura Yozo
Borden Ladner Gervais Llp
Sumitomo Electric Industries Ltd.
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