Design of integrated hybrid silicon waveguide optical. Emcores stateoftheart fiber optic gyroscope fog technology achieves higher performance with lower cswap cost, size, weight and power than competing units and legacy designs. What links here related changes upload file special pages permanent link page. The fibre optic gyroscope fog offers the potential of a low cost, high performance strap down inertial navigational instrument. As mentioned in the introduction to this thesis, all optical gyroscopes are based on the principles of the sagnac e. Emcore fiber optic gyroscopes fog components emcore. This platform can be anything that moves, including a car, boat, airplane or spacecraft. Why peoples are crying and what is the benefits of the crying. Evidence is provided with reference to published documents available on demand. Sagnac interferometer for gravitationalwave detection pdf. Alldigital processing electronics invented by ixblue. A gimbal mounted mechanical gyroscope remains pointing in the same direction after spinning. A fiber optic gyroscope is most often used for stabilization and navigation.
The saab fog sensor is a fiber optic ring interferometer comprising fiber coil, phase modulator, two fused fiber optic couplers, fiber optic polariser, superluminescent light module and photo receiving module with preamplifier. The relative phase difference is the sagnac phase shift the sagnac effect in vacuum. The sagnac effect, also called sagnac interference, named after french physicist georges. However its principle of operation is instead based on the interference of light which has passed through a coil of optical fibre, which can be as long as 5 km. Fiberopticgyroscope measurements close to rotating liquid. Theoretical design of a depolarized interferometric fiberoptic gyroscope ifog on smf28 singlemode standard optical fiber based on closedloop sinusoidal phase modulation with serrodyne feedback phase modulation using simulation tools for tactical and industrial grade applications. Inertial rotation is measured in ifog as the phase difference between two lightwaves traveling in opposite direction around fiber optic sensing loop. S 55 avenue auguste renoir, marlyleroi, france yves.
The results of study of a fiberoptic gyroscope prototype with 0. A compact fiber optic gyroscope including a first housing. It was firstly seen as limited to mediumgrade applications, but today, it reaches ultimate theoretical performance and surpasses its wellestablished competitor, the ring laser gyroscope, in terms of bias noise and longterm stability. Jul 04, 2018 the implementation of the fiber optic gyroscope is mainly based on the segnik theory. Introducti on optical fiber gyroscope the basis for the optical fiber gyroscope is the sagnac effect sagnac, 19. Miniaturizable high performance fiber optic gyroscopes for small satellites nasa gsfc sttr nnxcg43c cotr kenneth hall 2011 t4. The device is very different from traditional optical. The rotation sensing part of a fog consists of a very simple interferometer.
Fogs measure the sagnac phase shift of optical radiation propagating along a fiber optic coil when it rotates around the winding axis. Fiber optic gyroscope market size, share, growth, trends. This noise is one of the main factors limiting the precision of a fiberoptic gyroscope. Napolitano 102010 fabien napolitano ixsea, an ixblue company chief product development officer 1 introduction this paper is a short analysis of key technological advantages of fiber optic gyroscope fog. The extremely small size of the togs unit allows the system to be used in many underwater applications where space is at a premium. Since then, the level of performance of the fog has been increased by about 3 orders of magnitude, reaching now a bias.
Fiber optics gyroscope market by sensing axis 1, 2, and 3, device gyrocompass, inertial measurement unit, inertial navigation system, and attitude heading reference system, application, and geography global forecast to 2022. The compass comprises a fibre optic gyroscope sensor, which links to a computer and then locates north. Each filter has a different model and each filter makes its own state prediction and then the system calculates the weighted state variables 6, 20, 21. A fiber optic gyroscope different from the standard concept is presented. Fiberoptic gyroscope accuracy improvement by suppressing the. Design of integrated hybrid silicon waveguide optical gyroscope sudharsanan srinivasan, renan moreira, daniel blumenthal and john e. Optical gyroscopes of optical gyroscope is the fibreoptic gyroscope, which dispenses with hollow tubes and mirrors in favour of routing the light through thin fibres wound tightly around a small spool.
Because it has no moving parts, there is nothing to go out of alignment and therefore it never requires recalibrating and is totally maintenance free. Ifog coil winding quadrupole wet, dry, flanged, hubbed or freestanding. Data from the fiber optic gyroscope was collected and logged at 10 hz via digital computer while volunteer participants performed a number of standard driving maneuvers and invehicle tasks. How to build a sagnac interferometer fiber optic gyroscope. Nov 09, 2015 3d printed fiber optic gyroscope sagnac interferometer duration. In the references 6, 8, 19, iae method was examined. The cryostat has such a shape, that the gyroscope can be inserted along the middleaxis up to the center of the rotating pot see figure 2.
Bias errors due to birefringent coupling centers in the fiber coil are avoided by using an unpolarized light source. A fibre optic gyroscope fog senses changes in orientation using the sagnac effect, thus performing the function of a mechanical gyroscope. It is shown theoretically that the excess noise of the radiation source can be compensated in a fiberoptic gyroscope with a 3. We propose and analyze a novel highly integrated optical gyroscope. Theoretical design of a depolarized interferometric fiber.
Modulated phase is used to compensate the phase of sagnac effect in digital closed. Fiber optic gyroscope pdf theory gyroscope optical fiber scribd. The interference on a sagnac interferometer is proportional to the enclosed area. A simplified user interface the master control unit contains the systems memory and supervises all the new technology, but kvhs homegrown fiber optic gyro devices remain at the systems heart. We report the first proofofprinciple demonstration of the resonant optical gyroscope with reflector that we have recently proposed. A fibre optic gyrocompass is a compass and instrument of navigation. The phase accumulated by a light wave, which propagates along a slowly rotating circular path, depends linearly on the rotation rateofthepath. Automatic north sensor using a fiberoptic gyroscope. The fiber optic gyroscope fog is a solid state rotation sensor with no moving parts. Barriers absence of laser lack of experience working with optical fibers machine shop 7. The results illustrate the versatility of the technology, showing its potential. Global fiber optics gyroscope market is expected to witness a steady growth during the forecast period from 2017 to 2025. The fiberoptic gyroscope started to be investigated in the mid 70s, opening the way for a fully solidstate rotation sensor. The light from the external source s is split by the beamsp1itter bs and travels in the clockwise and counterc1ockwise direction.
As the fog lack the mechanical components of the age old traditional gyroscopes, they show good performance in terms of weight, size, sensitivity, robustness and resistance to physical forces. Interference fiber optic gyroscope semantic scholar. The electronic part is a processing pcb that converts the optical module output into rate proportional voltages. Mar 10, 2020 a fiber optic gyroscope is a device that measures rotational movement of the platform or object it is on through the use of fiber optic technology. Fiber optic gyroscopes fogs represent an important development in the field of inertial sensors and are now considered an alternative technology to mechanical and ring laser gyroscopes for inertial navigation and control applications. This paper describes an inertial navigation system ins for autonomous quad copter application, based on fiber optic gyroscopes fog. The global fiber optics gyroscope market is highly competitive and dominated by few major players in the global market. Pdf fiber optical gyroscope for space applications researchgate. A fiber optic gyroscope different from the standard concept is. Largearea fiberoptic gyroscope on a multiplexed fiber network. Fiber optic gyroscope pdf theory free download as pdf file. If this instrument consists of optical and solid state material, its defined by fiber optic gyroscope fog. Fiberoptic gyroscope technology and ringlaser gyroscope technology. Pdf the threeaxis closedloop fiber optic gyroscopes are described.
It is sometimes part of a ships set of compasses, which also include a conventional gyrocompass and a magnetic compass. Largearea fiber optic gyroscope on a multiplexed fiber network c. A fibreoptic gyroscope fog senses changes in orientation using the sagnac effect, thus performing the function of a mechanical gyroscope. The fiber optic gyroscope a sagnac interferometer for. Applications areas for various gyroscope technologies, laser ring gyroscopes, fiber optic gyroscope and mems gyroscopes. A read is counted each time someone views a publication summary such as the title, abstract, and list of authors, clicks on a figure, or views or downloads the fulltext. Fiber optic gyro the teledyne cdl togs tiny optical gyro system is a low cost fog fibre optic gyro based north seeking compass for use on vessels and remotely operated vehicles rovs. Interference fiber optic gyroscope ifog is a novel optical rotation sensor based on sagnac effect. Fiber optical solution s fiberoptic strapdown inertial navigation systems sins have complete solidstate design with no rotating or other moving parts. The fiber optic gyroscope is a direct application of the sagnac interferom eter. We used a militarygrade optolink srs fiber optic gyroscope, which is mounted on a support structure outside the cryostat allowing it to change its position and orientation all around the cryostat. The fiber optic gyroscope market is segmented on the basis of sensing axis, device, application and.
A novel design of fiber optic gyroscope based ins system for. Levi1 1istituto nazionale di ricerca metrologica inrim, strada delle cacce 91, torino 105, italy. These fogs, as theyre known, use light instead of spinning metal to provide more precise stabilization than older gyro schemes. A looped fibreoptic coil multiplies the effective area by the number of loops. Another key application for sled is in navigation systems, primarily those in avionics and aerospace that use fiber optic gyroscopes fogs to make precise rotation measurements 11,12. Yjunction and pair of pushpull lowvoltage phase modulators. With the development of socalled laser gyroscopes and fiber optic.
Fibre optic gyroscopes b culshaw and i p giles department of electronic and electrical engineering, university college london, torrington place, london wc 1e 7je, uk abstract. The past 30 years of research and development around the world have established the fog as a critical sensor for highaccuracy inertial navigation systems. Fiber optic sensors fundamentals and applications, fourth edition, 2014 available at. Pdf the presented method, based on the theory and equations of fiber optic gyroscope, gives a possibility to select appropriate interferometric fiber. Compensation of excess noise in a fiberoptic gyroscope with. Precision fiber optical gyroscope with linear digital output. Miniaturizable high performance fiber optic gyroscopes for. Design and construction of a simple sagnac interferometer fiber optic gyroscope fog capable of serving as a rotation detector.
1358 1299 1233 465 206 88 429 507 1257 782 1519 19 1445 166 1167 104 40 1311 401 891 502 268 390 352 1281 319 992 647 513 1368 887 133 764 1122 158 31 1218 1044 601 283 302 1189 179 895 923 1284