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of the closed optical path: this is not simply the geometric area of the loop but is also increased by the number of turns in the coil. The FOG was first proposed by Vali and
Shorthill in 1976. Development of both the passive interferometer type of FOG, or IFOG, and a newer concept, the passive ring
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or resonant/mechanical gyroscopes, the FOG has no moving parts and doesn't rely on inertial resistance to movement. Hence, the FOG is an excellent alternative to a mechanical gyroscope. Because of their intrinsic reliability and long lifetime, FOGs are used for high performance space applications
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optics split light from a laser diode (or other laser light source) into two waves propagating in both clockwise and anticlockwise directions through a coil consisting of many turns of optical fibre. The strength of the
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A FOG provides extremely precise rotational rate information, in part because of its lack of cross-axis sensitivity to vibration, acceleration, and shock. Unlike the classic spinning-mass
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Like all other gyroscope technologies and depending on detailed FOG design, FOGs may require initial calibration (determining which indication corresponds to zero angular velocity).
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Some FOG designs are somewhat sensitive to vibrations. However, when coupled with multiple-axis FOG and accelerometers and hybridized with Global
Navigational Satellite System (
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Chen, Xiyuan; Wang, Wei (2017). "Extracting and compensating for FOG vibration error based on improved empirical mode decomposition with masking signal".
209:) data, the impact is mitigated, making FOG systems suitable for high shock environments, including gun pointing systems for 105mm and 155mm howitzers.
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136:, the beam travelling against the rotation experiences a slightly shorter path delay than the other beam. The resulting differential
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is proportional to the enclosed area. A looped fibre-optic coil multiplies the effective area by the number of loops.
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Two beams from a laser are injected into the same fibre but in opposite directions. Due to the
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resonator FOG, or RFOG, is proceeding in many companies and establishments worldwide.
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The references used may be made clearer with a different or consistent style of
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is measured through interferometry, thus translating one component of the
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Vali, V.; Shorthill, R. W. (1976). "Fiber ring interferometer".
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Modern
Inertial Technology: Navigation, Guidance, and Control
116:. However its principle of operation is instead based on the
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into a shift of the interference pattern which is measured
414:, Springer, Chapters 11 and 12 (pages 169–207), 1998.
124:, which can be as long as 5 kilometres (3 mi).
179:The FOG typically shows a higher resolution than a
426:Pavlath, G.A. (1994). "Fiber-optic gyroscopes".
112:, thus performing the function of a mechanical
8:
120:of light which has passed through a coil of
464:, 2003 Kluwer Academic Publishers, Boston.
477:Handbook of Fibre Optic Sensing Technology
176:and military inertial navigation systems.
108:) senses changes in orientation using the
76:Learn how and when to remove this message
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219:Attitude and Heading Reference System
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479:, 2000, John Wiley & Sons Ltd.
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430:. Vol. 2. pp. 237–238.
224:Hemispherical resonator gyroscope
462:Introduction to Avionics Systems
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27:Gyroscope that uses fiber optics
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239:Vibrating structure gyroscope
186:FOGs are implemented in both
244:Optical heterodyne detection
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475:José Miguel López-Higuer,
484:The Fiber-Optic Gyroscope
317:The Fiber-Optic Gyroscope
229:Inertial measurement unit
436:10.1109/LEOS.1994.586467
315:Lefèvre, Hervé (1993).
486:, 1993, Artech House.
428:Proceedings of LEOS'94
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92:The interference on a
319:. ARTECH HOUSE, INC.
102:fibre-optic gyroscope
94:Sagnac interferometer
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18:Fibre optic gyroscope
387:10.1364/AO.56.003848
294:10.1364/AO.15.001099
249:Ring laser gyroscope
181:ring laser gyroscope
158:is dependent on the
379:2017ApOpt..56.3848C
286:1976ApOpt..15.1099V
234:Inertial navigation
460:R.P.G. Collinson,
410:Anthony Lawrence,
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373:(13): 3848–3856.
254:Quantum gyroscope
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16:(Redirected from
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343:. Archived from
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194:configurations.
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66:October 2020
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192:closed-loop
138:phase shift
508:Gyroscopes
502:Categories
351:2019-05-27
260:References
167:Advantages
58:footnoting
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188:open-loop
173:gyroscope
128:Operation
114:gyroscope
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213:See also
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