WO2010057373A1 - 一种绕制光纤线圈用的可分离式骨架及光纤线圈制备方法 - Google Patents
一种绕制光纤线圈用的可分离式骨架及光纤线圈制备方法 Download PDFInfo
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- WO2010057373A1 WO2010057373A1 PCT/CN2009/070368 CN2009070368W WO2010057373A1 WO 2010057373 A1 WO2010057373 A1 WO 2010057373A1 CN 2009070368 W CN2009070368 W CN 2009070368W WO 2010057373 A1 WO2010057373 A1 WO 2010057373A1
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- Prior art keywords
- fiber
- fiber optic
- skeleton
- optic cable
- hub
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C19/00—Gyroscopes; Turn-sensitive devices using vibrating masses; Turn-sensitive devices without moving masses; Measuring angular rate using gyroscopic effects
- G01C19/58—Turn-sensitive devices without moving masses
- G01C19/64—Gyrometers using the Sagnac effect, i.e. rotation-induced shifts between counter-rotating electromagnetic beams
- G01C19/72—Gyrometers using the Sagnac effect, i.e. rotation-induced shifts between counter-rotating electromagnetic beams with counter-rotating light beams in a passive ring, e.g. fibre laser gyrometers
- G01C19/721—Details
- G01C19/722—Details of the mechanical construction
Definitions
- the invention relates to a skeleton for winding a fiber coil and a method for preparing the fiber coil.
- phase difference between the two beams of light in the opposite direction of the fiber ⁇ L is the length of the fiber ⁇
- D is the average diameter of the fiber ⁇
- ⁇ is the wavelength of the light wave
- C is the propagation speed of the light wave in the vacuum
- ⁇ is the angular velocity sensitive to the fiber optic gyroscope.
- the phase difference ⁇ % between the two beams transmitted in the opposite direction of the fiber optic cable is proportional to the product LD of the length and the average diameter of the fiber turns, so that in addition to increasing the diameter of the fiber bundle skeleton, the high-precision fiber optic gyroscope A relatively long fiber is also used to wrap the fiber optic cable.
- the non-reciprocal phase difference between the two beams in the opposite direction of the fiber coil caused by the rotation is one of the main sources of error of the fiber optic gyroscope.
- the probability of this non-reciprocal phase difference is greater, and the non-reciprocal phase difference is caused by factors such as thermal expansion of the fiber strand skeleton in the temperature environment and uneven thermal field.
- This non-reciprocal phase difference problem It must be overcome through process improvement.
- the integral result of equation (4) is zero, and the phase difference introduced by the temperature disturbance is zero.
- the stress-induced refractive index change is the same as the temperature-induced refractive index change. If the two-segment fibers with a point symmetry in the meandering pass undergo the same stress change, the phase difference introduced by the stress perturbation is also zero.
- the main problems with the above scheme are: In actual cases, due to the imperfection of the winding (such as the incomplete symmetry of the winding, the intersection of each layer of fiber in the fiber strand), the imperfection of the curing process (glue The thickness is not uniform, the thermal equilibrium time of the fiber is long, the temperature gradient is nonlinear, etc.), the two-segment fiber that is symmetric with respect to the midpoint of the coil is unlikely to experience the same temperature field, because the dipping of the fiber in the curing process does not force the fiber in the fiber strand. Evenly, the thermal expansion and contraction of the skeleton exerts stress on the optical fiber, etc., and the fiber optic coil does not experience the same stress field.
- the fiber optic cable In the environment of temperature and mechanical vibration, the fiber optic cable cannot meet the precision requirements of the high-precision fiber optic gyroscope. It is also necessary to further improve the design on the basis of the existing ones. Improve the performance of the fiber optic cable and improve the accuracy of the fiber optic gyroscope.
- the domestic patent publication number CN 101275835A the invention name "de-skeleton winding ring fixture for the fiber optic gyro without the upper fiber ring"
- the application removes the flanges on both sides of the skeleton by means of a jig , the upper part of the fiber optic cable is not bounded by the upper edge, and is in a free state.
- the application is complicated to implement by means of a jig, and the hub in the skeleton is not separated from the turns, and the stress generated by the hub on the radial direction of the fiber strand cannot be eliminated.
- the technical problem of the present invention is to overcome the deficiencies of the prior art, and provide a separable skeleton for winding a fiber optic cable and a fiber strand preparation method using the skeleton to improve the temperature characteristics of the fiber strand and Vibration characteristics.
- a detachable skeleton for winding a fiber optic cable comprising: a hub and two flanges, respectively detachably mounted at two ends of the hub, wherein the hub is provided with A detachable structure in which the hub is separated from the fiber bobbin wound thereon.
- the detachable structure is formed with a boss on at least one end surface of the hub and a hole provided on the flange to cooperate with the boss.
- the hub is formed by splicing at least two cylinders whose inner and outer cylinder faces are curved surfaces, and the easy-to-remove structure is an axial through gap formed between at least one of the two cylinder faces at the joint of the cylinder body and a filling member that coincides with the gap.
- the detachable structure further includes a boss machined at one end of the hub or at the end of the filling member, and the flange is provided with a hole or groove that cooperates with the boss.
- the method for preparing a fiber optic cable of the present invention comprises the following steps:
- step (2) After the step (2) is completed, the following steps are also performed:
- step (4) After the step (4) is completed, the following steps are also performed:
- the fiber strand is subjected to stress release by a small amount of vibration.
- the vibration level is controlled at 2 ⁇ 6g, and the time is controlled at 30 ⁇ 60 minutes.
- the thickness of the hot melt in the step (1) is 0.5 to 1 mm.
- the winding process in the step (2) is: determining the tension applied to the first layer according to the number of layers of the fiber strand and the outer diameter of the skeleton, and linearly decreasing layer by layer during the winding process The tension of the fiber is wound until it is around the entire line.
- ⁇ is the maximum allowable tension of the fiber, ⁇ is usually less than 30g;
- E is the elastic modulus of the optical fiber
- D is the inner diameter of the skeleton.
- the layer-by-layer linear reduction of the tension of the fiber is decremented by X satisfying / « + 2 ⁇ ;
- n is the number of layers of the winding layer
- the pressure in the step (2) in which the curing gel is immersed under vacuum pressure is controlled to be between 0.5 and 2 MPa.
- the impregnation step (2) employed in curing adhesive hardness of less than 25 degrees, thermal expansion coefficient of less than 510-4.
- the heat-curing substance is added to the curing glue to quickly achieve thermal equilibrium in the temperature environment.
- the speed of the centrifuge is controlled at 500 ⁇ 2000 rpm, and the time is controlled for 2-5 minutes.
- the curing in the step (3) is carried out by heating or at room temperature or by ultraviolet light.
- the temperature of the heating in the step (4) is not more than 60.
- the separable skeleton of the present invention is easy to separate.
- the method for preparing the optical fiber strand of the present invention adopts the separable skeleton of the present invention, and applies a layer of hot sol on the surface of the skeleton before winding the wire, thereby reducing the difficulty of removing the fiber strand from the skeleton, and reducing The probability of accidental damage to the fiber optic cable and other stresses introduced during the skeleton process is reduced.
- the invention adopts a method for impregnating the curing glue under vacuum pressure, so that the inner and outer layers of the fiber strand can be uniformly dipped, which is beneficial to realize the temperature field symmetry of the fiber strand and can significantly improve the vibration characteristics of the fiber strand.
- the resulting skeleton-free fiber optic cable eliminates the thermal expansion and contraction of the fiber strand skeleton and the force of the fiber coil caused by other deformations, and the temperature characteristics of the fiber strand can be significantly improved.
- the method of the invention adopts the method of centrifuge squeezing after the completion of impregnation of the optical fiber strands, so that the colloidal adhesion of the optical fiber strands can be more uniform, thereby improving the performance of the light ray enthalpy.
- the coil winding method of the present invention controls the stress of the entire coil by reducing the tension layer by layer, so that the distribution stress of the fiber strand is small, and the stress matching in the coil is improved under the working temperature condition.
- the present invention is applied to the method of applying the heat insulating glue to the innermost layer and the outermost layer of the optical fiber coil, so that the optical fiber strand is less affected by the temperature field, and the problem of long-term stability of the high-precision fiber optic gyroscope is solved.
- the invention adopts a method of adding silver powder or other heat conductive material to the curing glue, so that the fiber strand can quickly reach the heat balance in the temperature field, and the non-reciprocal error caused by the temperature gradient is reduced.
- the present invention uses a skeleton-free fiber optic cable to form a high-precision fiber optic gyroscope, and employs a process of uniformly bonding the colloid to the fiber optic cable in the dipping process, thereby improving the temperature stability and vibration of the high-precision fiber optic gyroscope.
- the characteristics and the precision are obviously improved; the separation technology is adopted in the design and the detachment of the skeleton, the preparation efficiency of the fiber strands is improved, the damage to the fiber strands and other adverse effects are reduced; the invention also accelerates the fiber strands.
- the method of heat balance and isolation of the wire ⁇ by the external temperature field improves the stabilization time of the high-precision fiber optic gyroscope.
- Figure 1 is a schematic diagram of temperature or stress disturbance in a fiber optic cable
- 2 is a schematic structural view of a preferred embodiment of a detachable skeleton for winding a fiber optic cable according to the present invention; wherein 2a is a main view and 2b is a half-sectional view;
- 3 is a schematic structural view of another preferred embodiment of a separable skeleton for winding a fiber optic cable according to the present invention; wherein 3a is a main view and 3b is a half-sectional view;
- Figure 4 is a perspective view of a skeleton of a third preferred embodiment of the separable skeleton for winding an optical fiber strand according to the present invention
- Figure 5 is an exploded perspective view of Figure 4.
- Figure 6 is a partial view of Figure 4; wherein 6a is a main view and 6b is a half-section top view.
- FIG. 2 is a schematic structural view of two preferred embodiments of the separable skeleton for winding an optical fiber strand according to the present invention, each comprising a hub 1 and two flanges 2, two flanges 2
- Each of the two ends of the hub 1 is detachably mounted by a screw 4, and the hub 1 is provided with a detachable structure for separating the hub from the optical fiber bobbin wound thereon, and the detachable structure can be processed on one end surface of the hub 1.
- the processing boss 6 can be used in the manner of FIG. 2, that is, at the center of the end face of the hub 1, or in the manner of FIG.
- the boss 6 is matched with the corresponding hole on the flange 2.
- the flange 2 is separated from the hub 1, a portion of the boss 1 that is not covered by the optical fiber is left on the hub 1, and the hub 1 is separated from the optical fiber yoke by dragging the boss 6, that is, the boss 6 is convenient for the hub 1 Remove from the fiber optic cable.
- the connection between the flange 2 and the hub 1 can be mechanically fixed or glued.
- the utility model comprises a wheel hub 1, two flanges 2 and a detachable structure, and the hub 1 is formed by splicing at least two cylinders whose inner and outer cylinder faces are curved surfaces, and is easy to disassemble.
- the structure comprises an axial through gap formed between at least one of the two cylindrical faces of the column joint, a filling member that matches the gap, a boss that is machined at one end of the hub or the end of the filling member, and is disposed on the flange There are holes or slots that cooperate with the boss.
- the hub 1 is composed of two symmetrical semi-cylindrical joints, and the two semi-cylindrical joints are machined with wedge-shaped grooves 5 and internal unloading gaps 7, wedge-shaped
- the groove 5 and the inner unloading gap 7 constitute an axially penetrating gap as described above, and the inner unloading gap 7 is disposed adjacent to the inner ring of the semi-cylindrical shape, and the wedge-shaped groove 5 is disposed adjacent to the outer ring of the semi-cylindrical body, and the two are in the radial direction, but The circumferential length of the wedge groove 5 is larger than the inner relief gap 7.
- a wedge block 3 is formed which is matched with the wedge groove 5; a wedge 6 is formed on the wedge block 3, and a groove matching the boss 6 is arranged on the flange 2, and the two flanges 2 are respectively mounted on the hub 1 at both ends, forming the skeleton.
- the flange 2 and the hub 1 of the skeleton can be connected by mechanical fixing (using screws 4) or by means of glue.
- the detachable skeleton is assembled into the assembly of Fig. 4. After the optical fiber is wound and solidified, the flange 2 is first removed, and the wedge block 3 is taken out in the axial direction.
- the outer circle of the wedge block 3 and the outer cylindrical surface of the hub 1 are combined and processed to ensure a high cylindricity.
- the wedge block 3 is designed in a dovetail shape to prevent the wedge block 3 from being swayed in the radial direction, and the slot on the flange is axially restricted to the wedge block 3.
- the easy-disassembled structure of the hub 1 is designed to have an axial through gap, so that the hub 1 is composed of a plurality of cylinders, and each cylinder is fixed on the flange. When the flange is removed, the cylinders are easily moved to the gap. Close to the door, easy to remove the hub 1.
- the hub 1 is composed of two semi-cylindrical bodies, and a gap formed by the inner disengagement gap 7 and the wedge-shaped groove 5 is left between the two semi-cylindrical bodies.
- the wedge-shaped block 3 is mounted on the wedge-shaped groove 5, so that the inner unloading gap 7 passes outside.
- the wedge block 3 is supported to avoid the influence of the gap on the fiber winding. After the fiber strand is solidified, the wedge block 3 above the inner unloading gap 7 can be taken out, and the two half cylinders constituting the hub 1 are naturally contracted inward, so that the separation of the fiber strand and the skeleton can be more easily realized.
- the wedge-shaped groove 5 can also be disposed on the hub 1 at the portion of the hub 1 that has an internal relief gap adjacent to the outer ring.
- Example 1 The design of the separable skeleton in Example 1 can be carried out by referring to the following process: First, according to the basic principle of the Sagnac meter: Formula
- ⁇ is the phase difference between the two beams of light in the opposite direction of the fiber
- L is the length of the fiber ⁇
- D is the average diameter of the fiber ⁇
- ⁇ is the wavelength of the light wave
- C is the propagation of the light wave in vacuum Speed Degree
- ⁇ is the angular velocity sensitive to the fiber optic gyroscope. That is, the phase difference between the two beams of the optical fiber turns in the opposite direction is proportional to the product of the length L of the fiber turns and the average diameter D. According to the specific accuracy requirements of the fiber optic gyroscope, the fiber length L and the average of the fiber turns are determined.
- the following is a detailed description of the preparation method of the optical fiber strand of the present invention in combination with the above three structures, as follows:
- the surface of the skeleton described in the embodiment 1 or the embodiment 2 or the embodiment 3 is coated with a layer of hot melt of about 1 mm;
- the optical fiber is wound into the skeleton according to the quadrupole symmetry method, and the optical fiber of 2 m length is left at both ends of the coil and is formed into a circle of about cD30 mm, and the 2 m long optical fiber is well protected, and the root is fixed on the skeleton.
- 2m fiber dipping outside the fiber optic cable In order to avoid 2m fiber dipping outside the fiber optic cable.
- the wound fiber optic cable is placed in a vacuum pressure device, and after vacuuming, the solidified glue mixed with silver powder or other heat conductive material is injected into the vacuum pressure device, the hardness of the cured rubber is less than 25 degrees and the thermal expansion coefficient is less than 5 ⁇ . 10- 4 .
- the pressure is controlled between 0.5 and 2 MPa.
- the fiber ⁇ is taken out, the fiber ⁇ is fixed on a specific tool, installed on the centrifuge, and the centrifuge is set.
- the rotation speed is 500 ⁇ 2000r/min, start the centrifuge to carry out the silicone glue, remove the fiber optic cable after 2 ⁇ 5 minutes, and cure according to the curing requirements of the glue used.
- the vibration is also applied to the fiber line of the order of 2 ⁇ 6g. ⁇ Stress release, time control is 30 ⁇ 60 minutes, then put the fiber optic cable in the thermostat, set the temperature of the incubator to 40 ⁇ 60 °C, after the thermostat reaches the set temperature for 2 minutes, the fiber optic cable is removed from the skeleton Remove the upper surface, clean the surface of the fiber optic cable, and then apply the heat-insulating adhesive to the innermost layer and the outermost layer of the wire. After the heat-insulating adhesive is cured, the entire fiber-free fiber strand without skeleton is prepared.
- winding turns described above can be carried out by a conventional quadrupole symmetry method or by the following method:
- the winding tension of the first layer of fiber is set.
- the outer diameter of the supporting fiber is cp F
- the number of layers of the winding is n
- the maximum tension allowed by the fiber is Y
- the winding tension F of the first layer is controlled.
- the fiber tension is a factor that directly determines the fiber stress, assuming each layer of light
- the coefficient of decrement of the fiber tension is x, then X satisfies: ⁇ + 2 ⁇ .
- the principle is to control the winding tension of the uppermost fiber to be no less than 2g. If the tension is less than 2g, the fiber will not be able to be wound, and the cross-coupling between the fibers will also bring additional stress to the fiber ,, if the X value is less than 1 g, then you can change the decrement unit from one layer to one quad, and so on.
- the ⁇ value is less than 30g.
- the fiber optic cable is applied to the fiber optic gyroscope tool for testing.
- Table 1 shows the temperature test data of the fiber optic cable of different processes applied to the fiber optic gyroscope. As shown in Table 1, the absolute value of the zero mean measured by the process of the present invention is Both the value and the standard deviation are much smaller than the corresponding parameter values in the conventional process.
- Table 2 shows the vibration test data of the fiber optic gyroscope. The fiber optic gyroscope is mounted on the vibrating table for random vibration. The zero mean value and the standard deviation are the smaller the change in the vibration and before and after the vibration.
- the variation of the standard deviation of the vibration 1.23 of the process of the present invention with the standard deviation before vibration of 0.24 and the standard deviation after vibration of 0.25 are 0.99 and 0.98, respectively, while the standard deviation of the vibration of the ordinary process is 2.25 and before the vibration.
- the standard deviation of 0.42 and the post-vibration standard deviation of 0.46 are 1.83 and 1.79, respectively, and the process of the present invention is significantly smaller than the standard deviation obtained by the conventional process. Therefore, it can be clearly seen from the table that the performance of the optical fiber strands using the process of the present invention is significantly better than that of the conventional fiber strands.
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Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
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US12/747,636 US8663731B2 (en) | 2008-11-19 | 2009-02-06 | Detachable framework used for winding optical fiber coil and a method of producing optical fiber coil |
EA201070644A EA017366B1 (ru) | 2008-11-19 | 2009-02-06 | Отделяемый каркас, используемый для намотки оптоволоконных катушек, и способ изготовления оптоволоконных катушек |
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CN2008102268673A CN101551249B (zh) | 2008-11-19 | 2008-11-19 | 一种可分离式骨架及利用该骨架实现的光纤线圈制备方法 |
CN200810226867.3 | 2008-11-19 |
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US (1) | US8663731B2 (zh) |
CN (1) | CN101551249B (zh) |
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WO (1) | WO2010057373A1 (zh) |
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CN101551249A (zh) | 2009-10-07 |
EA017366B1 (ru) | 2012-11-30 |
CN101551249B (zh) | 2011-04-27 |
EA201070644A1 (ru) | 2010-12-30 |
US8663731B2 (en) | 2014-03-04 |
US20100260930A1 (en) | 2010-10-14 |
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