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Fiber Optic Gyroscopes Instrumentation: Sensors and Signals

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History Developed in the 1980s as an alternative to Laser Ring Gyroscopes. ▫ More compact ▫ Less sensitive

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Comparison and applications

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WHOI Puma

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How does a RLG work? Based on the Sagnac effect, like the FOG

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Basic FOG configuration

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Classical explanation Basics Variation in wave vectorWave vectorPhase shift

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Classical explanation Phase difference Using Geometry

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Classical explanation Integrating phase difference along the path length

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FOG Equation Angular wavenumber

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Relativistic Explanation *Only correct if the detector is moving with the gyroscope

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Open loop configuration with phase modulation

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Analog signal implementation

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Analog circuit implementation

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Signal Processing Used

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Digital circuit implementation Digital signal processing apparatus. First to forth heterodyne mixers (2, 3, 4 and 5), an ADC (6), a timing pulse generating unit (7), a cosine/sine signal generating unit (8), first and second digital multipliers (9, 10), first and second digital filters (11, 12), a quadrant discriminating unit (13), an angular velocity computing unit (15), a phase modulation index computing unit (14) and a reference signal generating circuit (1).

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Digital circuit implementation Digital signal processing apparatus. First to forth heterodyne mixers (2, 3, 4 and 5), an ADC (6), a timing pulse generating unit (7), a cosine/sine signal generating unit (8), first and second digital multipliers (9, 10), first and second digital filters (11, 12), a quadrant discriminating unit (13), an angular velocity computing unit (15), a phase modulation index computing unit (14) and a reference signal generating circuit (1). 3 2 1 4 Isolate different harmonics

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Digital circuit implementation Digital signal processing apparatus. First to forth heterodyne mixers (2, 3, 4 and 5), an ADC (6), a timing pulse generating unit (7), a cosine/sine signal generating unit (8), first and second digital multipliers (9, 10), first and second digital filters (11, 12), a quadrant discriminating unit (13), an angular velocity computing unit (15), a phase modulation index computing unit (14) and a reference signal generating circuit (1). 4 5 Digital Filter Low pass => DC component kept

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Digital circuit implementation Digital signal processing apparatus. First to forth heterodyne mixers (2, 3, 4 and 5), an ADC (6), a timing pulse generating unit (7), a cosine/sine signal generating unit (8), first and second digital multipliers (9, 10), first and second digital filters (11, 12), a quadrant discriminating unit (13), an angular velocity computing unit (15), a phase modulation index computing unit (14) and a reference signal generating circuit (1).

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Digital circuit implementation Digital signal processing apparatus. First to forth heterodyne mixers (2, 3, 4 and 5), an ADC (6), a timing pulse generating unit (7), a cosine/sine signal generating unit (8), first and second digital multipliers (9, 10), first and second digital filters (11, 12), a quadrant discriminating unit (13), an angular velocity computing unit (15), a phase modulation index computing unit (14) and a reference signal generating circuit (1).

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Digital circuit implementation Digital signal processing apparatus. First to forth heterodyne mixers (2, 3, 4 and 5), an ADC (6), a timing pulse generating unit (7), a cosine/sine signal generating unit (8), first and second digital multipliers (9, 10), first and second digital filters (11, 12), a quadrant discriminating unit (13), an angular velocity computing unit (15), a phase modulation index computing unit (14) and a reference signal generating circuit (1).

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Quantum Theoretical Performance Limit,,, Theoretically

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Sources of nonidealities Nonreciprocity – differences in the optical paths of the counter propagating waves Polarization Backscattering Magneto-optical Faraday effect

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Case Study: RA2100 (KVH Industries)

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Source: ftp://ftp.uni-duisburg.de/Hardware/KVH/ec2k-b.pdf

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Case Study: RA2100 (KVH Industries)

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