CN101706279B - Fiber optic gyro coil wound by square section preformed fibers - Google Patents
Fiber optic gyro coil wound by square section preformed fibers Download PDFInfo
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- CN101706279B CN101706279B CN2009101537183A CN200910153718A CN101706279B CN 101706279 B CN101706279 B CN 101706279B CN 2009101537183 A CN2009101537183 A CN 2009101537183A CN 200910153718 A CN200910153718 A CN 200910153718A CN 101706279 B CN101706279 B CN 101706279B
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Abstract
The invention discloses a fiber optic gyro coil wound by square section preformed fibers. The fiber optic gyro coil is formed by winding the square section preformed fibers to a framework layer by layer, and the external surface of one preformed fiber is parallel to the axis of the coil all the time. The square section preformed fiber consists of a buffer layer with circular external section contour line and a reinforced layer with foursquare external section contour line, which are coated and cured outside polarization-preserving or common single-mode fibers in turn. The section of the preformed fibers for winding the coil is foursquare, so the concave phenomenon of the fibers is not easy to happen during winding, and the fiber twist is controlled during winding; the reinforced layer improves the rigidity of the coil, and the buffer layer reduces the stress transfer efficiency to the fibers, so the stress produced by vibration at the fibers is remarkably reduced, and the vibration performance of the coil is improved; and the reinforced layer reduces the thermal expansion degree of the coil, and the buffer layer reduces the thermal stress transfer efficiency to the fibers, so the thermal stress produced by the unmatched thermal expansion at the fibers is remarkably reduced, and the temperature performance of the coil is improved.
Description
Technical field
The present invention relates to optical fiber gyro coil, relate in particular to a kind of optical fiber gyro coil that turns to square section preformed fibers.
Background technology
Interferometric fiber optic gyroscope is based on a kind of rotation angle rate sensor of Sagnac (Sagnac) effect, its minimum reciprocal structure comprises following a few part: a light source, a detector, an optical fiber directional coupler, a polarizer (comprising one or more depolarizers sometimes), an integrated optics Y waveguide, a fiber optic sensing coil that turns to by polarization maintaining optical fibre or general single mode fiber.The light that light source sends is divided into along the light of the positive and negative two directions transmission of coil by Y waveguide through coupling mechanism, forms interference by the Y waveguide coupling and through coupling mechanism at the receiving end of detector through two-beam behind the coil.During the coil rotation, the light path difference of two-beam experience, the interference light intensity that detector receives changes thereupon, detects the rotation angle speed with the coil stationary platform thus.
Series of advantages such as that optical fibre gyro has is highly reliable, long-life, startup fast, great dynamic range.The structure of whole solid state of optical fibre gyro makes it have prior advantage than the mechanical rotor that adopted in the past or the scheme of gas ring laser.But environmental factor still can influence the output of optical fibre gyro by the phase differential that changes positive and negative two-beam in the fiber optic coils.When these environmental factors change and in whole section optical fiber during asymmetric distribution in time, light along the positive and negative two directions transmission of optical fiber will experience different phase places, produce the phase shift with the coil irrelevant to rotation, thereby the Sagnac phase shift that this phase shift and rotation cause can't be distinguished and causes systematic error.
When being in the vibration environment, optical fiber gyro coil inside especially produces the time varying stress that is caused by vibration with the skeleton contact position, the asymmetric distribution of this stress causes the optical path difference of positive and negative two-beam by photoelastic effect, thereby causes the vibration sensing of optical fiber gyro coil.Because the needs of environment for use, the vibration sensing of optical fibre gyro are the major issues of being badly in need of solution always.The method of existing reduction optical fiber gyro coil vibration sensing adopts simultaneously and solidifies the big soundness of encapsulating material to guarantee that coil is good of back Young modulus for carrying out rational Machine Design.The coil resonance that rational Machine Design can avoid structure to bring, the big encapsulating material of Young modulus can improve the resonance frequency of coil itself after solidifying, but the big encapsulating material of Young modulus is also high with the efficient that the vibration stress of other positions passes to optical fiber, because the vibration sensing of coil is mainly caused by the suffered stress of optical fiber, so heavily stressed transmission efficiency has weakened the benefit that high resonance frequency is brought.This shows, want to improve the vibration sensing of optical fiber gyro coil, only adopt said method also to be nowhere near, need to seek other reducing inside of optical fibre vibration stress more efficient methods in the coil.
During variation of ambient temperature, become when in optical fiber, existing the asymmetric temperature field, hot expansibility between optical fiber gyro coil and the skeleton does not match and has extra heat stress in the optical fiber with causing, and becomes asymmetric when this extra heat stress is same, thereby causes the temperature sensitivity of optical fibre gyro.The temperature sensitivity of optical fibre gyro has become the principal element of its widespread use of restriction.The method of the reduction optical fibre gyro temperature sensitivity of existing widespread usage variously makes in the optical fiber temperature field and the extra heat stress symmetry as far as possible that distributes for the symmetrical windings that strengthen reciprocity for using.For example use the optical fiber gyro coil of quadrapole winding coiling to demonstrate, but, still can not eliminate the error that variation of ambient temperature causes fully because of the influence of non-ideal factor in the actual winding process than the better temperature characterisitic of original scroll winding.So will reduce on the one hand the non-ideal factor in the winding process, on the other hand except that winding method, also need careful design optical fiber gyro coil inner structure and material reducing the influence of thermal stress, thereby improve the temperature performance of optical fibre gyro.
In addition, the optic fibre turning in the light gyro coil winding process can produce additional circular birefringence in optical fiber, when it combines with environmental magnetic field, can cause the bias magnetic field sensitivity of optical fibre gyro, restriction system environment for use by Faraday effect.So, in the coil process, must control reversing of optical fiber.Existing optical fiber gyro coil process technology or do not adopt an effective measure as yet to reversing, or in coil winding the reversing of control optical fiber.The latter uses optical instrument to be difficult to the torsional capacity of the real-time effectively control of monitoring in real time round section optical fiber because of carrying out synchronously with coiling.So, want to solve the torsion problem of optical fiber in the coil, also need improve to the coil process.
At last, because the round section of optical fiber through regular meeting " depression " phenomenon takes place in the optical fiber gyro coil winding process, promptly optical fiber section in upper strata is absorbed in the lower floor optical fiber slit.This phenomenon is huge to the influence of various symmetrical windings such as quadrapole winding, because the environment consistance of having destroyed symmetric sections optical fiber of " depression " has weakened the benefit that various symmetrical windings are brought greatly.In addition, the generation of " depression " also can cause the local stress sudden change, combines the environmental performance that further worsens light gyro coil with environmental factor.The existing method that addresses this problem is for promptly being coated with adhesive curing behind every layer of optical fiber of coiling, but lowly can not get widespread use because of work efficiency.Therefore, be efficient " depression " problem that solves in the coil winding process, equally need be to the improvement design of winding process.
In a word, environmental performances such as the vibration of optical fiber gyro coil, temperature, magnetic field are the principal elements that the restriction optical fibre gyro is used, and the optic fibre turning in the winding process and " depression " have further worsened its environmental performance.There is the method for the above-mentioned performance of various improvement to exist at present, but problem do not solved fully as yet, and the still incompetent effective ways that vibration, temperature, the magnetic field performance of optical fiber gyro coil are improved simultaneously.For example for the encapsulating material that improves the high Young's modulus that the coil vibration performance adopts because of its low linear expansion coefficient, will to the temperature performance of coil appreciable impact be arranged by thermal stress.So, seek a kind of can improve simultaneously the vibration temperature performance of coil and effectively in the control coil method of optic fibre turning and " depression " be very important.
Summary of the invention
Can not effectively solve the problem of coil vibration temperature susceptibility and optic fibre turning and " depression " simultaneously at existing optical fiber gyro coil job operation, the object of the present invention is to provide a kind of optical fiber gyro coil that turns to square section preformed fibers, with reversing and " depression " of optical fiber in effective control coil, reduce optical fiber in vibration and the temperature environment lower coil the time become asymmetric stresses, improve the vibration temperature performance of optical fibre gyro simultaneously.
The technical solution used in the present invention is as follows:
Optical fiber gyro coil is formed to skeleton by square section preformed fibers coiling successively, and a certain preformed fibers outside surface is parallel with coil axis all the time.
Described square section preformed fibers is to protect partially or applying successively outside the general single mode fiber and solidifying cushion and enhancement Layer forms; Described cushion cross section outer contour is circular; Described enhancement Layer cross section outer contour is a square.
The beneficial effect that the present invention has is:
(1) the used preformed fibers of coiling cross section is a square, makes to be difficult for taking place optical fiber " depression " phenomenon in the winding process;
(2) square section preformed fibers has been controlled the optic fibre turning in the winding process naturally, only need when making preformed fibers control reverse just can, improve operability;
(3) enhancement Layer improves the coil rigidity, and cushion reduces the Stress Transfer efficient to optical fiber, makes vibration produce stress at the optical fiber place and significantly reduces, and improves the coil vibration performance;
(4) enhancement Layer reduces the thermal expansion degree of coil, and cushion reduces the thermal stress transmission efficiency to optical fiber, makes thermal expansion not match and significantly reduces in optical fiber place generation thermal stress, improves the coil temperature performance.
Description of drawings
Fig. 1 is the optical fiber gyro coil sectional view that square section preformed fibers turns to.
Fig. 2 is the preformed fibers sectional view.
Among the figure: 10, optical fiber gyro coil, 11, preformed fibers, 12, encapsulating material, 13, protect partially or general single mode fiber, 14, cushion, 15, enhancement Layer, 16, a certain preformed fibers outside surface, 17, skeleton, 18, coil axis.
Embodiment
As shown in Figure 1 and Figure 2, optical fiber gyro coil 10 of the present invention uses quadrapole winding or other to form to skeleton 17 for the symmetrical winding coiling successively that strengthens the optical fibre gyro reciprocity by a continuous preformed fibers 11, a certain preformed fibers outside surface 16 is parallel with coil axis 18 all the time, and the optical fiber gap can select suitable encapsulating material 12 to fill.
As shown in Figure 2, preformed fibers 11 is to protect partially or applying successively outside the general single mode fiber 13 and solidifying cushion 14 and enhancement Layer 15 forms; Cushion 14 cross section outer contours are circular, the back Young modulus is very low by solidifying, thermal expansivity with the guarantor inclined to one side or general single mode fiber 13 approaching soft materials form, a kind of optional material is a silicon rubber; Enhancement Layer 15 cross section outer contours are square, and the back Young modulus is very high by solidifying, thermal expansivity and skeleton 17 approaching hard materials are formed, and a kind of optional material is an acrylate; Cushion 14 can be optimized design according to different materials with the thickness of enhancement Layer 15.
The step that processes optical fiber gyro coil 10 as shown in Figure 1 is:
(1) protecting partially or general single mode fiber 13 is outer applies the cushion 14 of predetermined thickness and solidify, guaranteeing partially in the whole process or general single mode fiber 13 nothings are reversed;
(2) enhancement Layer 15 of coating preliminary dimension and curing outside cushion 14 guarantees to protect in whole process partially equally or general single mode fiber 13 nothings are reversed;
(3) the preformed fibers 11 winding optical fiber gyro coils 10 that use curing to finish, make a certain preformed fibers outside surface 16 parallel with coil axis 18 all the time in the winding process, can in the optical fiber gap, use encapsulating material 12 bonding or filling and curing in the winding process or after finishing.
When being in the vibration environment, produce time dependent asymmetric stresses in the optical fiber gyro coil coil 10, cause the sensitivity of 10 pairs of vibrations of optical fiber gyro coil by photoelastic effect.The existence of enhancement Layer 15 has improved the resonance frequency of optical fiber gyro coil 10 because of its high Young's modulus, thereby has reduced the mean stress at required operating frequency range inner fiber gyro coil 10.Simultaneously, cushion 14 is because of the softness characteristics of its low Young modulus, under the certain condition of the mean stress of optical fiber gyro coil 10, reduced protecting partially or the Stress Transfer efficient of general single mode fiber 13, promptly absorbed the stress that partial vibration causes, reduced the glass core place and be subjected to stress.Again because of influential to photoelastic effect only be fibre core stress, so this structure effectively reduces the susceptibility of the 10 pairs of vibrations of optical fiber gyro coil that cause because of photoelastic effect, improved the vibration performance of optical fibre gyro.In addition, square sectional characteristic because of preformed fibers 11, adjacent coating and the THICKNESS CONTROL that more helps encapsulating material 12 in the process of the adjacent cylinder in plane between each circle fiber segment of each layer than round section fiber segment, because of the reasonable use of encapsulating material 12 also can improve the vibration performance of optical fiber gyro coil 10, so the square sectional characteristic of preformed fibers 11 provides advantage for the vibration performance of using encapsulating material 12 to improve optical fiber gyro coils 10.
During variation of ambient temperature, because the hot expansibility in the optical fiber gyro coil 10 between each component or coil and the skeleton 17 does not match, in optical fiber gyro coil 10, produce time dependent asymmetric thermal stress, and then cause the temperature sensitivity of optical fiber gyro coil 10 by photoelastic effect.Enhancement Layer 15 is close with skeleton 17 because of its thermal expansivity, so reduced the equivalent thermal expansivity of optical fiber gyro coil 10, has reduced the thermal stress that does not match and cause because of thermal expansivity between optical fiber gyro coil 10 and the skeleton 17; While cushion 14 is because of its thermal expansivity and the guarantor is inclined to one side or general single mode fiber 13 is close, so reduced the thermal stress that does not match and cause because of thermal expansivity around here.In addition, to similar in the vibration environment, cushion 14 is because of the softness characteristics of its low Young modulus, other components have been reduced to protecting partially or the thermal stress transmission efficiency of general single mode fiber 13, reduced fibre core place thermal stress that photoelastic effect is worked, thereby reduced the temperature sensitivity of the optical fiber gyro coil 10 that thermal stress causes, improved the temperature performance of optical fibre gyro.
In addition, the Faraday effect that causes bias magnetic field sensitivity in the optical fibre gyro be the analysis showed that the circular birefringence that optic fibre turning etc. causes in the optical fiber gyro coil 10 is the main cause that produces faraday's phase error.In the procedure of processing of the optical fiber gyro coil that the present invention proposes, protect when at first guarantee to apply solidifying cushion 14 partially or general single mode fiber 13 does not have and reverses with enhancement Layer 15, secondly in the process of coiling, make a certain preformed fibers outside surface 16 parallel with coil axis 18 all the time, utilize the convenient control of shape facility preformed fibers 11 not have and reverse.Control protected partially or general single mode fiber 13 does not have to reverse with the winding process of optical fiber gyro coil 10 and separates, optic fibre turning is controlled at realizes on the engineering that difficulty reduces, for the magnetic field performance that improves optical fibre gyro provides advantage.
At last, in the round section optical fiber winding process that generally uses, because of lower floor's optical fiber surface uneven, be subjected to the component of coil axis 18 directions along the line easily around fiber segment, make it be easy to be slipped in the lower floor optical fiber gap, also do not use encapsulating material when lower floor's fiber position and fix or this gap when big, just can produce fiber segment " depression " phenomenon." depression " phenomenon in the optical fiber gyro coil process is the serious hindrance of symmetrical windings such as quadrapole in the through engineering approaches application facet.The optical fiber gyro coil 10 that the present invention proposes has the square sectional characteristic because of the preformed fibers 11 that adopts, and make its a certain preformed fibers outside surface 16 parallel with coil axis 18 all the time in the winding process, so every plane of when a circle optical fiber, forming based on a certain preformed fibers outside surface 16 or the outside surface in parallel of winding optical fiber section before all the time, the power that this circle optical fiber is subjected to does not have the component of coil axis 18 directions along the line, makes it be difficult to slip in the lower floor optical fiber gap." depression " avoid having given full play to the advantage of symmetrical windings such as quadrapole aspect the environmental performance raising of optical fiber gyro coil 10.
In a word, the present invention is protecting partially or outer cushion successively 14 of general single mode fiber 13 and enhancement Layer 15, has significantly improved the vibration and the temperature performance of optical fiber gyro coil 10; The square sectional characteristic of enhancement Layer 15 has effectively been controlled in the coil winding process and have been protected partially or the reversing and " depression " of general single mode fiber 13, for the realization of symmetrical windings such as the magnetic field performance of raising optical fiber gyro coil 10 and quadrapole provides advantage.
Claims (1)
1. optical fiber gyro coil that turns to square section preformed fibers, optical fiber gyro coil (10) is formed to skeleton (17) by a square section preformed fibers (11) coiling successively, and an outside surface (16) of described preformed fibers is parallel with coil axis (18) all the time; It is characterized in that: described square section preformed fibers (11) is to protect partially or applying successively outside the general single mode fiber (13) and solidifying cushion (14) and enhancement Layer (15) forms; Described cushion (14) cross section outer contour is circular; Described enhancement Layer (15) cross section outer contour is a square.
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| CN2009101537183A CN101706279B (en) | 2009-11-02 | 2009-11-02 | Fiber optic gyro coil wound by square section preformed fibers |
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| CN2009101537183A CN101706279B (en) | 2009-11-02 | 2009-11-02 | Fiber optic gyro coil wound by square section preformed fibers |
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| CN101706279B true CN101706279B (en) | 2011-05-11 |
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| CN101915576B (en) * | 2010-07-13 | 2011-10-26 | 皮亚斌 | Optical fiber loop for optical fiber gyroscope |
| CN106959107B (en) * | 2017-02-27 | 2020-07-07 | 九江四元科技有限公司 | Winding method of high-stability optical fiber ring with trapezoidal section |
| CN111412909A (en) * | 2020-05-18 | 2020-07-14 | 北京思卓博瑞科技有限公司 | Optical fiber gyroscope supporting framework and optical fiber gyroscope |
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