This platform can be anything that moves, including a car, boat, airplane or spacecraft. The results of study of a fiberoptic gyroscope prototype with 0. A fibre optic gyroscope fog senses changes in orientation, thus performing the function of a mechanical gyroscope. Since then, the level of performance of the fog has been increased by about 3 orders of magnitude, reaching now a bias. A previous study 9 has reported reductions in the errors induced by the kerr effect 170, shupe effect 6. Fiber optic rotation sensing devices, such as gyroscopes, comprise two main components, 1 a front end including a light source and detector and 2 a fiber optic interferometer, including sensor coil, coupler and polarizer that are mounted to a system. Fibre optic gyroscopes for space use spie digital library. Alldigital processing electronics invented by ixblue. Fundamentals and applications september, 2015 david krohn, ph. The fiberoptic gyroscope, second edition, lefevre, herve c. Pdf a novel design of fiber optic gyroscope based ins system. In the system we proposed, one light path is divided into three paths and sinusoidal wave modulations of different frequencies are respectively applied to generate the sideband.
Saabs fiber optic gyros, fog, are designed to provide maximum stabilisation in tough environments. Download fiber optic communications 5th edition pdf ebook. A photonic bandgap fiber optic gyroscope pbfog, as illustrated in figure 1, consists of a broadspectrum source, a coupler, an integrated optic chip ioc, and a pbf coil 7,8. We could help you build the fog system with the shortest time.
Rotation of the coil produces sagnac shifts in all the beams that have equal magnitudes but opposite signs. Sld laser diode,ase light source,2x2 pm fused coupler,yphase modulator,pinfet receiver,pm fiber gyro coil. The present invention relates to fiber optic gyroscopes and concerns sensing coils therefor. The implementation of the fiber optic gyroscope is mainly based on the segnik theory. Fibre optic gyroscope a related device is the fibre optic gyroscope which also operates on the basis of the sagnac effect, but in which the ring is not a part of the laser. The forg fibre optic resonant gyroscope opeeration principle uses a recirculating ring resonant cavity to get a rotationinduced sagnac effect enhancement. Fibre optic gyroscope wikipedia, the free a fibre optic gyroscope fog senses changes in orientation, thus performing the function of a mechanical gyroscope. Gyroscope comprising a source 1 for the emission of a light beam, a loop 5 of optical fiber in which the light propagates in one direction and in the other, a mirror 9 with double phase conjugation arranged in said loop 5 so that light arrives on said mirror 5 on one side and on the other thereof, recombination means 4 for recombining the light which has propagated in the loop. A and c are the wavelength m and the speed of light ms in free space. Thus the fibre may form the basis of a transducer involving neither moving parts nor electrical connections. Among the technologies available for gyroscopes usable in space, the fibre optic gyroscope fog technology appears to be the most. Scope of the presentation 4 the fiber optic gyroscope shall be described within this presentation, at first focusing on the interferometric roots according to sagnacs effect. For calculating the sagnac phase shift, an optical path laying on a.
Other articles where fiberoptic gyroscope is discussed. Fiber optic sensors principles and applications pdf. Use features like bookmarks, note taking and highlighting while reading the fiberoptic gyroscope, second edition. The presented method, based on the theory and equations of fiber optic gyroscope, gives a possibility to select appropriate interferometric fiber optic gyroscope ifog parameters and components. An overview of optical gyroscopes theory, practical. Opticalbased rotation sensors have revolutionized precision, highsensitivity inertial navigation systems. Gyroscopes and inertial measurement units are essential for navigation, guidance, stabilization, and pointing. Yjunction and pair of pushpull lowvoltage phase modulators. The fiber optic gyroscope a sagnac interferometer for. Itarfree technology for high performance applications 22.
In past years much interest has been shown in the development of optical gyroscopes which offer the potential of solid state, highly reliable performance immune from many of the mechanical effects which restrict the performance of conventional spinning mass gyroscopes. Learn more details with our gyro componets products. Barriers absence of laser lack of experience working with optical fibers machine shop 7. Also, a designed military and civilian aircrafts as the sensor of. Method of eliminating dead band in fiber optical gyro. Light travelling in an optical fibre may be directly modulated by external parameters such as pressure, strain, temperature, etc. The fiberoptic gyroscope, second edition kindle edition by lefevre, herve c download it once and read it on your kindle device, pc, phones or tablets. However fogphotonicss fiber optic gyros based on the interference of light which has passed through a coi. Fiber optic sensors fundamentals and applications, fourth edition, 2014 available at. This paper is a short analysis of key technological advantages of fiberoptic gyroscope fog technology. We present briefly the qualification of the technology. A fog is based on an optical fiber coil in a passive interferometer and uses a solidstate.
As a vital representative of gyroscope, the fiberoptic gyroscope fog has advantages in terms of compact. Efficient modulation and processing method for closedloop fiber. Optical gyroscopes include laser gyroscopes, fiberoptic gyroscopes, and micromachined. For this reason, gyroscopes in what follows from here, gyros are key elements, which are. The fiberoptic gyroscope, second edition, lefevre, herve. A fibre optic gyroscope fog senses changes in orientation using the sagnac effect, thus performing the function of a mechanical gyroscope. Protonexchanged linbo 3 integratedoptic circuit very high polarizer rejection manufactured by ixblue. Now the development of lowloss optical fibers and compact and reliable semiconductor light sources for the telecommunication industry has made possible a new approach. That is the reason it is sometimes called an active ring resonator. Fiber optic gyroscope pdf theory gyroscope optical fiber.
Fibre optic gyros are passive optical gyros and make use of advances in four distinct fields, i. A new scheme of threefrequency differential detection with a sideband locking technique is firstly proposed to suppress backscattering noise for improving the accuracy of resonator fiber optic gyroscope rfog. In the past, wavelength stability over time was a major drawback of semiconductor based broadband light sources like sleds compared with fiberbased light sources such as erbiumdoped. Fibreoptic sagnac interferometer as seismograph for. Aug 05, 1992 fibre optic resonator interferometer gyroscope this invention relates to a fibre optic resonator interferometer gyroscope. Apr 18, 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. Redirected from fibre optic gyroscope jump to navigation jump to search. Rather, an external laser injects counterpropagating beams into an optical fiber ring, where rotation causes a relative phase shift between those beams when interfered. Advances in optical gyroscopes spie digital library. The interference on a sagnac interferometer is proportional to the enclosed area. For the moment, they make use of mechanical gyroscopes or gas laser gyroscopes.
Fiberoptic gyroscope accuracy improvement by suppressing the. A looped fibreoptic coil multiplies the effective area by the number of loops. Fiber optic gyroscopes fogs are free from the sensitivity problem which is common in strapdown devices in the form of false zero outputs at low rotation rate measurements 5, 6, 7. S 55 avenue auguste renoir, marlyleroi, france yves. This site is like a library, use search box in the widget to get ebook that you want. On the development and application of fog intechopen. 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 kilometres 3 mi. The basic scheme of the interferometric fiber optic gyroscope ifog is illustrated in figure 16. Napolitano 102010 effect, but also provides a natural linear readout, by simply recombining both counterpropagating wave outputs and measuring directly their frequency beating that is proportional to the rotation rate. Pdf the presented method, based on the theory and equations of fiber optic gyroscope, gives a possibility to select appropriate.
Handbook of optical fibre sensing technology download. Theoretical design of a depolarized interferometric fiberoptic. Such devices, otherwise known as a fibre resonator gyros, comprise a fibre or fibres defining a resonator loop through which clockwise cw and counterclockwise ccw beams are passed. A novel configuration for the optical fibre gyroscope is described which utilises highly birefringent fibre and polarisation mode selection to achieve a stable. Interferometric fiberoptic gyroscopes ifogs, computational. A chipbased, microoptical gyroscope is demonstrated that uses counterpropagating brillouin lasers to measure rotation as a sagnacinduced frequency shift. Conventional mechanic gyroscopes will be replaced more and more by this reliable and maintenancefree fiber optic version. This paper also discusses the two important fiber optic sensors, namely the mach zehnder interferometric fiber sensor and the fiber optic gyroscope. Click download or read online button to get handbook of optical fibre sensing technology book now. A fiber optic gyroscope is most often used for stabilization and navigation.
The global distributed fiber optic sensor adoption of fiber optics across telecom applications. However its principle of operation is instead based on the interference of light. An overview of optical gyroscopes theory, practical aspects. Feb 16, 2015 fiber optic sensing presents unique features that have no match in conventional sensing techniques. Digital dual ramp phase modulator for fiber optic gyroscope.
Diagram of the fiber optic gyroscope driven by a broadened semiconductor laser. They feature solidstate, lowdrift, high shock usability, small size and short startup time and are available as basic single axis fog sensor, 1, 2 and 3axis solutions with analogue or digital outputs. It is now considered an alternative technology to the mechanical and laser gyroscopes for the inertial guidance and control applications. 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. At the same time these sensors use bulky optical fiber spools or freespace resonators. Fibreoptic sagnac interferometer as seismograph for direct.
Get pdf abstract a family of space inertial measurement unit with several fibre optic gyroscopes have been developed, covering a large range of performance from 0,1h to 0,001h and space applications. Fogphotonicsa idealphotonics company is one scientific company in the fiber optic gyro and. Fiber optic gyroscope is an important development in the field of fiber optic sensors. Fibre optic gyroscope developments using integrated optic. Another class of transducers uses the fibre as a means of guiding light from a monitoring point to the measuring point where the light is externally modulated. This new and completely revised fifth model of fiber optic communications incorporates protection of great advances made inside the fiber business in present years to present an entire and indepth introduction to the basics of talking with optical fiber transmission strains. Lefevre, artech house, bostonlondon, 1993 2 fundamentals of the interferometric fiber optic gyroscopes, h. Pipeline distributed fiber optic monitoring system source. Interferometric fiber optic gyroscopes principle of operation and basic parameters.
How to choose the right fiber optic gyro kvh industries, inc. The fibre optic gyroscope fog offers the potential of a low cost, high performance strap down inertial navigational instrument. Fiber optic gyroscopes springer fiber optic gyroscopes herv c the fiberoptic gyroscope l, 2, 3. Fibre optic gyroscope developments using integrated optic components fibre optic gyroscope developments using integrated optic components minford, w. Osa resonant fiber optic gyroscope with threefrequency. However, because its useful signal is the angular changes, the detected phase shift i is integrated in time needed to give it. A fibreoptic gyroscope fog senses changes in orientation using the sagnac effect, thus performing the function of a mechanical gyroscope. The rlg was demonstrated only a few years after the invention of the laser in 1960, and it is based on heliumneon hene technology. The key requirements for fiber optic gyroscopes are typically low cost, reduced form factor, low power consumption, longterm stability and high reliability. Nedaero fiber optic gyroscope fog itarfree maintenance.