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Mechanism And Suppression Of Temperature Effect Of Photonic Crystal Fiber Optic Gyroscope

Posted on:2014-10-01Degree:DoctorType:Dissertation
Country:ChinaCandidate:H R YangFull Text:PDF
GTID:1268330425966998Subject:Precision instruments and machinery
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Like all interferometers, the FOG is sensitive to temperature, albeit to a lower extent thanmost interferometers due to its basic reciprocal configuration. In a FOG, an asymmetrictemperature variation along the sensing fiber will induce a drift in the output signal, whichwill be erroneously interpreted as a change in rotation rate. Though a number of engineeringsolutions have been implemented to combat the Shupe effect, such as special fiber windingschemes, they do not constitute a perfect solution and they have also resulted in an increasedcomplexity and cost. This effect is still currently responsible for the bulk of the drift in FOGs,and it is large enough to prevent the successful use of a FOG for navigation.Therefore, we dofurther analysis on this issue, to find a breakthrough point to solve the problem from anotherresearch direction, and the urgent need to propose a new method to suppress the effect oftemperature on the impact of FOG.The development of photonic crystal fibers(PCFs), especially the development andresearch of polarization maintaining(PM) PCFs have provided the brand-new thought for thefiber optical gyroscope solution adaptability to environment issue. Compared with traditionaloptical fiber, PCFs possess flexibility design degree, characteristics of lower sensitivity oftemperature and stress, and low bending loss. The development and application of PCFs haveprovided broad prospect for the research of FOG. Compared to the normal optical fibers,PCFs are much more superiority in decreasing optic noise, decreasing FOG volume andincreasing the temperature stability and precision for FOG. We take the problem oftemperature drift characteristics of FOG as the breakthrough point of this dissertation.Starting from research subject of restrain temperature effect of FOG, we carry out study onnew mechanism and restraining method of temperature effect for the FOG in basic researchlevel. The following main topics are included in this dissertation:(1) In view of the fact that PCFs have many advantages. In this dissertation, a newthought that using PCFs make FOG sensitive ring proposed, in order to improve thetemperature effect of the FOG. Starting from the mechanism of temperature effect, Shupeeffects in optical fibers is analyzed indepth and detailedly. Light transmission model in PCFis theoretically derived. The influence of temperature field for solid-core PCFs is analyzed. Inaddition, temperature distribution model of the sensitive fiber rings and temperature noise ofthe FOG is carried out analysis and research in-depth.(2) In view of the issue encountered in the development of FOG, the performancerequirement of FOG to PM fiber is analyzed and given in this dissertation. Through carefully analyzing various performance of PM PCFs, it has fully confirmed the superiority of PMPCFs in solution FOG adaptability to environment issue. In view of the different demand forfiber properties of FOG, dissertation presented optimization and design method for modelfield, non-linearity, effective refractive index and birefringence and other performance of PCF,and has carried on the analysis and the proof to these methods.(3) Fiber optic ring is one of the most important FOG devices, it is also most affected bytemperature effect. Therefore, the temperature gradient, stress, the effects of electromagneticinterference on performance of fiber optic ring are analyzed indepth in this dissertation. Thewinding way of PCFs sensitive ring is studied, and a phase error caused by the windingprocess of the non-ideal is nalyzed. The overall structure of PM PCF optic gyro is proposed.The theoretical models of optics and theoretical model of PM PCF optic gyroscope areestablished using Jones matrix. The phase modulation plan and closed-loop processing of PMPCF gyroscope is analyzed and given. The welding technology between PM PCFs andtraditional PM fibers is given, and the alignment technology of PM PCF are given.(4) Temperature contrast experiment between PM PCF optic ring and traditional fiberoptic ring is carried on, and temperature experiments of PCF gyroscope which under normaltemperature and poikilothermia situation are carried on in this dissertation. It verify that thetemperature stability of PM PCFs is much stronger, and it verify that the PM PCF optic gyropossess potential advantages on suppressing temperature effect, increasing stability andimproving accuracy of FOG. In order to further repress the temperature effect of PM PCFoptic gyroscope, temperature compensation, structural optimization and other methods arepropsded in this dissertation. novel PM PCF structures with good matching mode field aredesigned, also a disassembling installment of sensitive optical fiber ring is designed.
Keywords/Search Tags:Temperature effect, fiber optical gyroscope(FOG), photonic crystal fiber(PCF), fiber optical ring, finite element method(FEM), temperature gradient
PDF Full Text Request
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