CN113884083B - Magnetic fluid-based hollow microstructure fiber loop winding stress release method - Google Patents
Magnetic fluid-based hollow microstructure fiber loop winding stress release method Download PDFInfo
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- CN113884083B CN113884083B CN202111001550.1A CN202111001550A CN113884083B CN 113884083 B CN113884083 B CN 113884083B CN 202111001550 A CN202111001550 A CN 202111001550A CN 113884083 B CN113884083 B CN 113884083B
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- 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
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Abstract
The invention relates to a magnetic fluid-based hollow microstructure optical fiber ring winding stress release method, which comprises the following steps: step 1, injecting magnetic fluid into the area occupied by filled air in the hollow microstructure optical fiber before or after winding the optical fiber ring; and 2, placing the wound optical fiber ring into a three-dimensional alternating magnetic field, and enabling magnetic fluid in the hollow microstructure optical fiber to generate alternating magnetic force under the alternating action of the magnetic field, wherein the alternating magnetic force uniformly acts on the hollow microstructure optical fiber to generate micro-stretching vibration with a small amplitude, and the micro-stretching vibration plays a role in eliminating the winding stress of the hollow microstructure optical fiber ring. The invention thoroughly releases the winding stress of the hollow microstructure optical fiber ring, and simultaneously the filled magnetic fluid plays a role in mechanical protection of the hollow microstructure optical fiber, thereby ensuring that the hollow microstructure optical fiber is not damaged.
Description
Technical Field
The invention belongs to the technical field of fiber optic gyroscopes, relates to a fiber optic ring winding technology, and in particular relates to a hollow microstructure fiber optic ring winding stress release method based on magnetic fluid.
Background
The fiber optic gyroscope is a high-precision sensor for measuring the rotational angular velocity of a carrier by utilizing the Sagnac effect, is a core device of an inertial system and a key component for determining the performance of the inertial system, and is widely applied to the fields of inertial navigation, control and the like. At present, the physical property characteristics of the used base material optical fiber determine the environmental adaptability level of the optical fiber gyro, and limit the practical application precision, for example, the optical transmission characteristics of the optical fiber are easily influenced by physical quantity fields such as temperature, magnetism, bending, irradiation and the like. The inherent optical fiber material characteristics bring adverse factors to the optical fiber gyroscope, complex system measures are needed to avoid, the system complexity is increased, and meanwhile, the economical efficiency is reduced.
With the development of the hollow microstructure optical fiber technology, the subversion technology transformation of the optical fiber transmission medium is started, and a new technical approach is provided for the improvement of the environment adaptability of the high-precision optical fiber gyroscope. Compared with the traditional optical fiber, the hollow microstructure optical fiber adopts a unique periodic micropore structure to form a brand new light guide mechanism, so that light is transmitted in the air of an ideal medium, and the hollow microstructure optical fiber has various performance advantages, such as low environmental sensitivity, low reciprocity noise and the like, and is an ideal sensing material of a high-precision optical fiber gyroscope.
In general, the air content in hollow-core microstructured optical fibers is relatively high, the size of the silica microstructure units in the cross section is in the order of several micrometers to several tens of micrometers, and the wall thickness of the structure is between tens of nanometers and hundreds of nanometers. The hollow micro-structure optical fiber is applied to the optical fiber gyro in the form of a ring, and the internal stress of the ring forming process is precisely controlled so as to avoid permanent damage to the hollow micro-structure optical fiber. The internal stress of the hollow microstructure optical fiber ring is derived from two aspects, namely the tension force and the optical fiber layer-crossing extrusion force in the winding process, and the shrinkage force of the ring solidified filling colloid. By the technical means of winding equipment, parameter optimization and the like, low-tension or even zero-tension winding of the hollow microstructure optical fiber can be realized, and curing shrinkage force can be eliminated by developing the study on the matching property of the filled colloid material characteristics (such as glass transition temperature, modulus, viscoelastic characteristics, creep and the like) and the hollow microstructure optical fiber. The optical fiber extrusion force generated randomly in the winding process is more serious at the position of the edge of the ring, additional alternating stress is applied to the ring by adopting a vibration method, the additional alternating stress is overlapped with the extrusion force, and when the friction in the optical fiber absorbs energy to reach or exceed the threshold value of the material, the ring undergoes microscopic or macroscopic viscoelastoplastic mechanical change, so that the residual stress generated by the extrusion force in the ring is reduced and homogenized. When the vibration mode is applied to eliminating extrusion force in the hollow microstructure optical fiber ring, the optical fiber internally contains suspended microstructure units (such as hollow antiresonant optical fiber) which are connected in a weak way, vibration is introduced under no stable mechanical support, the risk of damaging the microstructure units exists, and the method is not suitable for winding stress release of the hollow microstructure optical fiber ring.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a magnetic fluid-based hollow microstructure fiber loop winding stress release method which can avoid damaging a microstructure unit in an optical fiber and can realize effective stress release.
The invention has the advantages and positive effects that:
a magnetic fluid-based hollow microstructure fiber loop winding stress release method is characterized in that: the method comprises the following steps:
and 2, placing the wound optical fiber ring into a three-dimensional alternating magnetic field, and enabling magnetic fluid in the hollow microstructure optical fiber to generate alternating magnetic force under the alternating action of the magnetic field, wherein the alternating magnetic force uniformly acts on the hollow microstructure optical fiber to generate micro-stretching vibration with a small amplitude, and the micro-stretching vibration plays a role in eliminating the winding stress of the hollow microstructure optical fiber ring.
Further: in the step 1, under the condition that the optical fiber adopts a tape glue winding process, magnetic fluid injection is carried out on the hollow microstructure optical fiber to be wound before the winding of the ring;
further: in the step 1, under the condition that the optical fiber adopts a glue filling process, magnetic fluid injection is carried out after the winding of the hollow microstructure optical fiber ring is completed.
Further: in the step 1, the process steps of filling the magnetic fluid in the optical fiber are as follows:
step 1.1, immersing all hollow microstructure optical fibers into magnetic fluid, wherein the magnetic fluid is contained in a container with an internal air pressure treatment function;
step 1.2, vacuumizing the inside of the container, and pumping out air in the hollow microstructure optical fiber;
step 1.3, introducing pressure air into the container, performing pressurization treatment, enabling magnetic fluid to fully enter the hollow microstructure optical fiber under the action of pressure, and filling the area occupied by the air;
and 1.4, plugging the two ends of the optical fiber ring.
Further: the specific operation process of the step 2 is as follows: the hollow microstructure optical fiber ring is placed in a three-dimensional magnetic field generating device, firstly, an X-direction alternating magnetic field is started, the magnetic field change frequency is 10Hz, the magnetic field amplitude is 100Gs, and the duration is 10min; then closing the X-direction magnetic field, and then opening the Y-direction alternating magnetic field, wherein the magnetic field change frequency is 10Hz, the magnetic field amplitude is 100Gs, and the duration is 10min; then closing the magnetic field in the Y direction, and then opening the alternating magnetic field in the Z direction, wherein the magnetic field change frequency is 10Hz, the magnetic field amplitude is 100Gs, and the duration is 10min; then simultaneously starting X, Y and Z-direction alternating magnetic fields, wherein the magnetic field change frequency is 10Hz, the magnetic field amplitude is 100Gs, and the duration is 30min; and finally, closing the three-dimensional magnetic field, and ending the stress release operation of the hollow microstructure optical fiber loop.
The invention has the advantages and positive effects that:
the invention adopts magnetic fluid to fill the inside of the hollow microstructure optical fiber, after the winding of the ring is completed, alternating magnetic force is formed by utilizing the change of the magnetic field to be transmitted to the hollow microstructure optical fiber structure body, and the alternating magnetic force is coupled and overlapped with residual stress generated by winding in the optical fiber structure body, so that the winding stress of the hollow microstructure optical fiber ring is thoroughly released. Meanwhile, the filled magnetic fluid also plays a role in mechanical protection of the hollow microstructure optical fiber, solves the problem that residual stress is difficult to eliminate when the hollow microstructure optical fiber ring, especially a layer-crossing region is wound on the premise of not damaging the hollow microstructure optical fiber, and avoids the risk of permanent damage to the hollow microstructure optical fiber structure when the hollow microstructure optical fiber ring is formed into a ring-surrounding link.
Drawings
FIG. 1 is a schematic illustration of a hollow-core microstructured optical fiber;
FIG. 2 is a schematic illustration of a hollow-core microstructured optical fiber loop;
FIG. 3 is a schematic illustration of injection of magnetic fluid into a hollow microstructured optical fiber;
FIG. 4 is a schematic cross-sectional view of a magnetic fluid filled hollow core microstructured optical fiber;
FIG. 5 is a schematic diagram of the structure of an air core microstructured optical fiber loop filled with magnetic fluid in a three-dimensional alternating magnetic field.
Detailed Description
The structure of the present invention will be further described by way of examples with reference to the accompanying drawings. It should be noted that the present embodiments are illustrative and not restrictive.
Fig. 1 is a schematic diagram of an optical fiber with a hollow microstructure, wherein the structural body is made of silicon dioxide, six micron-sized hollow round microstructure units 2 are uniformly distributed on the inner side of a large hollow round structure 1, and the reflection efficiency of glancing incidence light at the thin wall of the microstructure unit is enhanced by a very simple cladding structure, so that the light is completely restrained in an air fiber core for transmission. The graph shows that the air in the hollow microstructure optical fiber occupies a relatively large area, the connection mechanical strength of the microstructure units is relatively weak, and a new nondestructive requirement is provided for a stress release means for winding the hollow microstructure optical fiber ring.
Fig. 2 is a schematic diagram of an optical fiber ring with a hollow microstructure, the optical fiber ring with the hollow microstructure is wound on two wire supply wheels in advance by adopting a symmetrical winding method, the optical fiber to be wound is divided into two equal sections A, B from the middle point, the optical fiber ring with the hollow microstructure is sequentially stacked layer by layer according to a preset symmetrical winding method (such as a four-pole winding method, an eight-pole winding method and a sixteen-pole winding method), the winding layer sequence is ABBA for example, the winding is repeated for completing the whole ring with the layer sequence as a period, a part of the continuous winding has a phenomenon of crossing 2 layers B, the optical fiber in the crossing region 3 is extremely easy to be extruded to generate residual stress in the ring, and especially, after the winding of the optical fiber ring with the hollow microstructure is completed, the stress must be released, otherwise, the internal microstructure of the optical fiber with the hollow microstructure is permanently damaged, and the optical fiber guiding machine with the hollow microstructure is disabled.
FIG. 3 is a schematic diagram of the injection process of magnetic fluid in hollow-core micro-structured fiber, wherein magnetic fluid 5 is contained in a container 4, the container is provided with a device capable of carrying out internal air pressure treatment, the hollow-core micro-structured fiber is immersed into the magnetic fluid, and the magnetic fluid is formed by mixing solid particles of the magnetic body, a base carrier liquid and a surfactant; and then carrying out vacuumizing treatment, pumping out air in the hollow microstructure optical fiber, and finally pressurizing the hollow microstructure optical fiber immersed in the magnetic fluid to ensure that the magnetic fluid fully enters the hollow microstructure optical fiber. When the tape glue winding process is adopted, the magnetic fluid injection is needed to be carried out on the hollow microstructure optical fiber to be wound before the winding of the ring, and when the glue filling process is adopted, the magnetic fluid injection can be carried out after the winding of the ring of the hollow microstructure optical fiber is completed.
Fig. 4 is a schematic cross-sectional view of a magnetic fluid filled hollow-core microstructured optical fiber, wherein the white region is the matrix portion silica 6 of the hollow-core microstructured optical fiber and the black region is the filled magnetic fluid 7. The magnetic fluid fills the area occupied by the air in the hollow microstructure optical fiber, on one hand, alternating magnetic force is formed by sensing magnetic field change of the magnetic fluid, and on the other hand, the mechanical protection effect on the thin-wall microstructure unit is achieved in the stress release process.
FIG. 5 is a schematic diagram showing the steps of placing an air core microstructure fiber loop filled with magnetic fluid in a three-dimensional alternating magnetic field 8, generating three-dimensional alternating magnetic field change by a magnetic field generating device (three-dimensional Helmholtz coil, model 3HLY 10-100), sensing the magnetic field change by the magnetic fluid in the air core microstructure fiber to form a magnetic force which changes reciprocally, transmitting the magnetic force to the air core microstructure fiber structure to generate telescopic vibration with a small amplitude, and superposing and coupling the telescopic vibration with fiber extrusion force so as to eliminate residual stress generated by winding in the air core microstructure fiber loop and not damaging the air core microstructure fiber. And after the stress of the ring is eliminated, taking out the magnetic fluid in the hollow microstructure optical fiber winding, and then carrying out a ring filling colloid curing link to complete the ring forming process of the hollow microstructure optical fiber ring.
Although the embodiments of the present invention and the accompanying drawings have been disclosed for illustrative purposes, those skilled in the art will appreciate that: various substitutions, changes and modifications are possible without departing from the spirit of the invention and the appended claims, and therefore the scope of the invention is not limited to the embodiments and the disclosure of the drawings.
Claims (5)
1. A magnetic fluid-based hollow microstructure fiber loop winding stress release method is characterized in that: the method comprises the following steps:
step 1, injecting magnetic fluid into the area occupied by filled air in the hollow microstructure optical fiber before or after winding the optical fiber ring;
and 2, placing the wound optical fiber ring into a three-dimensional alternating magnetic field, and enabling magnetic fluid in the hollow microstructure optical fiber to generate alternating magnetic force under the alternating action of the magnetic field, wherein the alternating magnetic force uniformly acts on the hollow microstructure optical fiber to generate micro-stretching vibration with a small amplitude, and the micro-stretching vibration plays a role in eliminating the winding stress of the hollow microstructure optical fiber ring.
2. The magnetic fluid-based hollow-core microstructured optical fiber ring winding stress release method according to claim 1, wherein the method comprises the following steps: in the step 1, under the condition that the optical fiber adopts a tape glue winding process, magnetic fluid injection is carried out on the hollow microstructure optical fiber to be wound before the winding of the ring.
3. The magnetic fluid-based hollow-core microstructured optical fiber ring winding stress release method according to claim 1, wherein the method comprises the following steps: in the step 1, under the condition that the optical fiber adopts a glue filling process, magnetic fluid injection is carried out after the winding of the hollow microstructure optical fiber ring is completed.
4. The magnetic fluid-based hollow-core microstructured optical fiber ring winding stress release method according to claim 1, wherein the method comprises the following steps: in the step 1, the process steps of filling the magnetic fluid in the optical fiber are as follows:
step 1.1, immersing all hollow microstructure optical fibers into magnetic fluid, wherein the magnetic fluid is contained in a container with an internal air pressure treatment function;
step 1.2, vacuumizing the inside of the container, and pumping out air in the hollow microstructure optical fiber;
step 1.3, introducing pressure air into the container, performing pressurization treatment, enabling magnetic fluid to fully enter the hollow microstructure optical fiber under the action of pressure, and filling the area occupied by the air;
and 1.4, plugging the two ends of the optical fiber ring.
5. The magnetic fluid-based hollow-core microstructured optical fiber ring winding stress release method according to claim 1, wherein the method comprises the following steps: the specific operation process of the step 2 is as follows: the hollow microstructure optical fiber ring is placed in a three-dimensional magnetic field generating device, firstly, an X-direction alternating magnetic field is started, the magnetic field change frequency is 10Hz, the magnetic field amplitude is 100Gs, and the duration is 10min; then closing the X-direction magnetic field, and then opening the Y-direction alternating magnetic field, wherein the magnetic field change frequency is 10Hz, the magnetic field amplitude is 100Gs, and the duration is 10min; then closing the magnetic field in the Y direction, and then opening the alternating magnetic field in the Z direction, wherein the magnetic field change frequency is 10Hz, the magnetic field amplitude is 100Gs, and the duration is 10min; then simultaneously starting X, Y and Z-direction alternating magnetic fields, wherein the magnetic field change frequency is 10Hz, the magnetic field amplitude is 100Gs, and the duration is 30min; and finally, closing the three-dimensional magnetic field, and ending the stress release operation of the hollow microstructure optical fiber loop.
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| CN115143995B (en) * | 2022-09-05 | 2022-11-18 | 中国船舶重工集团公司第七0七研究所 | Method and device for eliminating local stress distortion of optical fiber loop |
| CN116047655B (en) * | 2023-03-30 | 2023-06-06 | 中国船舶集团有限公司第七〇七研究所 | Manufacturing method of optical fiber ring with high temperature performance and optical fiber gyroscope |
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