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1 August 1991 All-fiber closed-loop gyroscope with self-calibration
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A fiber polarizer with an extinction ratio exceeding 72 dB and two high-birefringent fiber depolarizers of the Lyot type with a residual degree of polarization P below -20 dB reduce the long-term bias drift of an interferometric fiber gyroscope based on normal birefringent nonpolarization-maintaining single-mode fiber coil to an equivalent rotation rate of +/- 3 deg/h, while the theoretical limit of polarization-induced offset is at least one order lower. Therefore, the influence of the phase modulation distortion factor and of amplitude and birefringence modulations on the offset value are investigated in order to decrease these effects. A function synthesizer simulating modulated interferometer output signals at various Sagnac phases is used to control the zero-point and scale factor of the electronic unit. An additional second low-frequency phase modulation at a constant amplitude closes an optical feedback loop by compensating for the rotation-caused Sagnac phase shift during specific time periods of the low-frequency wave. The reported methods allow realization of optical gyroscopes using non-expensive standard single-mode fibers with a measuring range of more than 105 deg/h at a stability class below 1 deg/h.
© (1991) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Wolfgang Ecke, Siegmund Schroeter, Guenter Schwotzer, and Reinhardt Willsch "All-fiber closed-loop gyroscope with self-calibration", Proc. SPIE 1511, Fiber Optic Sensors: Engineering and Applications, (1 August 1991);

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