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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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