CN113804177B - Ultra-high precision optical fiber gyroscope structure - Google Patents
Ultra-high precision optical fiber gyroscope structure Download PDFInfo
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- CN113804177B CN113804177B CN202110962589.3A CN202110962589A CN113804177B CN 113804177 B CN113804177 B CN 113804177B CN 202110962589 A CN202110962589 A CN 202110962589A CN 113804177 B CN113804177 B CN 113804177B
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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
- G01C19/726—Phase nulling gyrometers, i.e. compensating the Sagnac phase shift in a closed loop system
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Abstract
The invention relates to an ultra-high precision optical fiber gyroscope structure.A double-layer magnetic shielding design is formed by adopting an installation base, an installation upper cover, an installation flange and an outer cover, so that an effective magnetic field shielding is provided for an optical fiber ring coil, and the optical fiber ring is prevented from being interfered by a magnetic field; a multilayer structure is formed, and the optical fiber design is subjected to heat insulation design by the multilayer structure and the optical fiber ring base and the optical fiber ring inner cover, so that the influence of the change of the environmental temperature on the optical fiber ring coil is reduced, and the measurement accuracy and the stability of the optical fiber gyroscope are improved; the whole structure is miniaturized, so that the gyroscope has excellent performance and meets the miniaturization requirement.
Description
Technical Field
The invention relates to a structure design technology of an optical fiber gyroscope, in particular to an ultra-high precision optical fiber gyroscope structure, and belongs to the technical field of optical fiber gyroscopes.
Background
The optical fiber gyroscope is a novel all-solid-state inertial instrument based on the Sagnac effect, is used for measuring the angular rate of a carrier, must keep working well in the whole life cycle of an aircraft, and is an indispensable component unit of a flight carrier. At present, the fiber optic gyroscope plays an increasingly important role in an inertial navigation system, and the fiber optic gyroscope with the precision of 0.001-0.01 degree/h (1 sigma) improves the temperature and the vibration resistance of an optical fiber ring and realizes the application in some fields. The domestic high-precision optical fiber gyroscope has higher precision level in a laboratory environment, but the precision in application environments such as temperature, magnetic field and the like has a certain difference from the highest level abroad, so that the requirements of high-orbit high-resolution satellites, new generation strategic weapons and the like cannot be met, the structural design level of the optical fiber gyroscope needs to be further improved, and the ultra-high-precision optical fiber gyroscope with the precision of 0.0001-0.0003 degree/h (1 sigma) in the application environment is realized.
Disclosure of Invention
The invention aims to overcome the defects and provides an ultra-high precision optical fiber gyroscope structure.A double-layer magnetic shielding design is formed by adopting a mounting base, a mounting upper cover, a mounting flange and an outer cover, so that effective magnetic field shielding is provided for an optical fiber ring coil, and the optical fiber ring is prevented from being interfered by a magnetic field; the optical fiber design is subjected to heat insulation design by the multilayer structure and the optical fiber ring base and the optical fiber ring inner cover, so that the influence of the environmental temperature change on the optical fiber ring coil is reduced, and the measurement precision and the stability of the optical fiber gyroscope are improved; the whole structure is miniaturized, so that the gyroscope has excellent performance and meets the miniaturization requirement.
In order to achieve the above purpose, the invention provides the following technical scheme:
an ultra-high precision optical fiber gyroscope structure comprises an optical fiber loop coil and a Y waveguide, and further comprises a mounting flange, an outer cover, a mounting base, a mounting upper cover, an optical fiber loop base and an optical fiber loop inner cover;
the optical fiber ring base and the optical fiber ring inner cover form a closed first annular cavity, and an optical fiber ring coil is fixedly installed in the first annular cavity;
the mounting base is provided with an annular groove and a linear groove, and two ends of the linear groove are respectively connected with the side wall of the inner ring of the annular groove; the installation upper cover and an annular groove and a linear groove arranged on the installation base are matched to form a second annular cavity and a first linear cavity, the optical fiber ring base and the optical fiber ring inner cover are accommodated in the second annular cavity, and a Y-shaped waveguide is fixedly installed in the first linear cavity;
the mounting flange is provided with a groove matched with the mounting base, and the outer cover and the mounting flange are matched to form a closed inner cavity for accommodating the mounting upper cover and the mounting base.
Further, the section of a first annular cavity formed by the optical fiber ring base and the optical fiber ring inner cover is rectangular; the optical fiber ring base comprises a first side wall and a second side wall which are vertical to each other; the optical fiber ring inner cover comprises a third side wall and a fourth side wall which are perpendicular to each other, the first side wall and the third side wall are parallel, the first side wall and the fourth side wall are respectively provided with a first inward flanging and a first outward flanging, and the second side wall and the third side wall are respectively provided with a second outward flanging and a second inward flanging; and the first inner flanging, the first outer flanging and the second outer flanging are bonded together and then laser seal welding is carried out.
Further, a cylindrical support column is arranged in a linear groove formed in the mounting base, the upper end face of the cylindrical support column is used for supporting and limiting the mounting upper cover, a threaded hole is formed in the cylindrical support column, and the screw is matched with the threaded hole to realize the fixed connection of the mounting upper cover and the mounting base; and the upper mounting cover is fixedly connected with the mounting base and then is subjected to laser seal welding.
Further, the mounting flange is provided with a flange annular groove and a flange straight line groove which are matched with the mounting base; the side wall of the inner ring of the flange annular groove is provided with an installation lug protruding towards the circle center of the flange annular groove; the outer cover extends to form a flanging matched with the mounting lug, and the mounting lug is matched with the flanging to realize the fixed connection of the mounting flange and the outer cover.
Furthermore, the number of the installation lugs is more than or equal to 3; each mounting lug is provided with 2 threaded holes for matching with the turned-over edge arranged on the outer cover; and each mounting lug is provided with 1 through hole for realizing the connection of the gyroscope and other external structures.
Further, the inner cover of the optical fiber ring is provided with a fiber passing hole for the tail fiber to enter a linear groove arranged on the mounting base; the mounting base is provided with a fiber feeding groove for feeding tail fibers; the mounting flange is provided with an outlet groove for the tail fiber of the optical fiber loop coil to be transited to the outer surface of the gyroscope.
Further, the optical fiber ring coil is connected to the optical fiber ring base through epoxy glue; the mounting base is fixed on the mounting flange through silicon rubber filling.
Furthermore, the diameter of the outer circle of the mounting base is equal to that of the outer circle of the mounting upper cover.
Furthermore, the mounting flange, the outer cover, the mounting base and the mounting upper cover are made of soft magnetic alloy; the mounting flange and the outer cover) are made of 1J85 materials, and the mounting base and the mounting upper cover are made of 1J79 materials;
the optical fiber ring base and the optical fiber ring inner cover are both made of non-metallic materials; the optical fiber ring base and the optical fiber ring inner cover both adopt the linear expansion coefficient less than or equal to 8 multiplied by 10 -6 K, thermal conductivity less than or equal to 2W/(m.K).
Furthermore, the wall thickness of the mounting flange is 1-1.5 mm, the wall thickness of the outer cover is 1-1.5 mm, the wall thickness of the mounting base is 1-1.5 mm, and the wall thickness of the mounting upper cover is 0.8-1 mm; the gap between the mounting flange and the side wall of the outer cover is 0.2-0.5 mm, the gap between the mounting base and the side wall of the optical fiber ring base is 0.5-0.8 mm, and the gap between the mounting base and the side wall of the optical fiber ring inner cover is 0.5-0.8 mm.
Further, the outer surfaces of the mounting flange and the outer cover are coated with ERB-2 thermal control black paint, and the hemispherical emissivity epsilon of the ERB-2 thermal control black paint Η Is 0.85.
Compared with the prior art, the invention has the following beneficial effects:
(1) According to the ultra-high precision optical fiber gyroscope structure, the double-layer magnetic shielding design is adopted for the optical fiber loop coil, so that effective magnetic field shielding is provided for the optical fiber loop coil, and the optical fiber loop is prevented from being interfered by a magnetic field; specifically, according to the material and structural characteristics of the magnetic shielding combination, when the material of the double-layer shielding is selected, the shielding layer close to the magnetic source, namely the mounting base and the mounting upper cover, is selected from a 1J79 material with a higher magnetic saturation value, and the second shielding layer, namely the mounting flange and the outer cover, is selected from a 1J85 material with relatively higher magnetic permeability; when the double-layer shielding is used, a certain gap is reserved between the metal layers instead of being tightly contacted, so that the mounting accuracy and the high efficiency of the magnetic shielding are ensured;
(2) According to the ultra-high-precision optical fiber gyroscope structure, a light path structure is free of a heat source, heat cannot be conducted to the optical fiber loop coil through heat conduction, heat radiation and the like, the influence of temperature gradient on the optical fiber gyroscope is reduced, the internal temperature is stable and uniform, and the measurement precision of the optical fiber gyroscope in the temperature environment change is improved.
(3) According to the ultra-high precision optical fiber gyroscope structure, the optical fiber ring base and the optical fiber ring inner cover are made of non-metal materials, the optical fiber ring coil is an important component of an optical fiber gyroscope system and has important influence on the use precision of the optical fiber gyroscope, the heat conduction coefficient of a ceramic material is very close to that of an optical fiber material, the temperature drift of the optical fiber ring coil can be effectively reduced, and the temperature sensitivity of an optical fiber ring component is reduced.
(4) According to the ultra-high-precision optical fiber gyroscope structure, the optical fiber design is subjected to heat insulation design through a multilayer structure and the optical fiber ring base and the optical fiber ring inner cover, particularly, the optical fiber ring base and the optical fiber ring inner cover are made of ceramic materials with the heat conductivity coefficient and the expansion coefficient close to those of the optical fiber, the influence of the environment temperature change on the optical fiber ring coil is relieved, the temperature change rate of the optical fiber ring coil is relieved, the design of rapid thermal balance of the optical fiber ring coil is realized, and the precision of the optical fiber gyroscope in the temperature environment is improved.
(5) According to the ultra-high-precision optical fiber gyroscope structure, the mounting flange is used as a bearing structure, the internal bridge type connection design is adopted, the structure natural frequency is high enough, the mounting error caused by structural part deformation is reduced on the basis of realizing optical path mounting, and meanwhile, the influence of Shupe error on the gyroscope precision is counteracted through the uniform structural design.
(6) According to the ultra-high precision optical fiber gyroscope structure, a film layer with high emissivity is prepared on the outer surfaces of the mounting flange and the outer cover, and the hemispherical emissivity coefficient epsilon Η 0.85, a heat radiation channel is added, and the external radiation of heat is accelerated by the high-efficiency outer layer heat protection.
(7) According to the ultra-high precision optical fiber gyroscope structure, the optical fiber ring inner cover and the optical fiber ring base are connected by adopting a laser sealing welding technology, so that a gap caused by structural entity support and mechanical installation in mechanical connection is avoided, and the structure is simpler, smaller in size and lighter in weight.
(8) According to the ultra-high precision optical fiber gyroscope structure, the uniform structural design is adopted, modularization and modularization of each component are realized, the formed modules or components can be independently assembled, the assembly manufacturability is good, the assembly process is simplified, and the ultra-high stability of the structure and the performance of the optical fiber gyroscope is realized.
(9) According to the ultra-high precision optical fiber gyroscope structure, the Y waveguide is arranged in the optical fiber loop coil after being installed, so that the size of the gyroscope is effectively reduced, the height size can reach 35mm, and the diameter size can reach 252mm; meanwhile, the influence of environmental factors on the optical fiber loop coil is reduced, the precision of the gyroscope reaches three ten-thousandth, and the gyroscope has smaller size and higher precision, and has wide application prospect in the technical field of optical fiber gyroscopes.
Drawings
FIG. 1 is a schematic diagram showing the structure of an ultra-high precision optical fiber gyroscope according to the present invention;
FIG. 2 is a schematic view of a mounting flange configuration according to the present invention;
FIG. 3 is a schematic view of the mounting base structure of the present invention;
FIG. 4 is a cross-sectional view of a fiber optic ring assembly configuration of the present invention;
fig. 5 is a first order modal analysis diagram of the mounting base of the present invention.
Detailed Description
The features and advantages of the present invention will become more apparent and appreciated from the following detailed description of the invention.
The word "exemplary" is used exclusively herein to mean "serving as an example, embodiment, or illustration. Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments. While the various aspects of the embodiments are presented in drawings, the drawings are not necessarily drawn to scale unless specifically indicated.
As the optical fibers in the optical fiber ring are inevitably twisted, under the action of a magnetic field, the light waves transmitted in the optical fiber ring generate circular birefringence, so that parasitic phase difference is generated between two counter-propagating light waves in the optical fiber ring, and the magnetic field error of the optical fiber gyroscope is caused, thereby influencing the application precision of the high-precision optical fiber gyroscope. Therefore, the magnetic shielding design of the fiber-optic gyroscope is an important link of the structural design of the gyroscope.
In addition, in an application environment, a thermally induced phase (Shupe) error can be caused by temperature change of the environment where the optical fiber ring in the optical fiber gyroscope is located, the influence of the environment temperature change on the optical fiber ring can be relieved by the aid of the multi-layer structure design and the heat insulation design among the multi-layer structures, meanwhile, the influence of the Shupe error on the gyroscope precision can be counteracted by the aid of the uniform structure design, and the precision of the optical fiber gyroscope in the temperature environment is improved.
The invention relates to an ultra-high precision optical fiber gyroscope structure, which comprises a mounting flange 1, an outer cover 2, a mounting base 3, a mounting upper cover 4, an optical fiber ring base 5, an optical fiber ring coil 6, an optical fiber ring inner cover 7 and a Y waveguide 8; the mounting flange 1 play a bearing role, 3 installation lugs 11 departments distribute 6 screw holes altogether for installation dustcoat 2, dustcoat 2 is packed mounting flange 1 into wherein and form the enclosed construction from one end, mounting flange 1 is equipped with the flange ring channel 12 that matches with installation base 3 for fixed mounting base 3, there is wire outlet groove 13 mounting flange 1's internal surface, is used for optic fibre ring coil tail optical fiber to pass through to the gyroscope surface. 3 installing lugs 11 of annular inner chamber punishment are equipped with 3 through-holes 14 respectively, and its main effect is the installation interface that the gyroscope is connected with external structure or other equipment.
The straight line groove in the middle of the installation base 3 is distributed with 4 threaded holes 31 for installing the Y waveguide 8, the straight line groove is surrounded by two parallel baffles and a bottom plate connected with the baffles, the installation base 3 is provided with a fiber passing groove 32 for tail fibers to enter a circuit assembly surface, the annular groove 33 of the installation base 3 is used for fixing the optical fiber ring base 5, and the straight line groove in the middle of the installation base 3 is provided with 2 cylindrical pillars 34 with threaded holes for fixing the installation base 4.
The optical fiber ring base 5 is used for fixing an optical fiber ring coil 6, the optical fiber ring coil 6 is connected to the optical fiber ring base 5 through epoxy glue, the optical fiber ring coil 6 is placed in an annular cavity formed between the optical fiber ring base 5 and the optical fiber ring inner cover 7, and a fiber passing hole is reserved in the optical fiber ring inner cover 7 and used for enabling tail fibers to enter a light path assembly face.
The mounting base is fixed on the mounting flange through silicon rubber filling.
After the outer cover 2 is sleeved outside the mounting flange 1, the upper end face of the outer cover 2 extends inwards to form an outward flange, and the outward flange is fixed with the mounting lug 11 of the mounting flange 1 through a screw.
The diameter of the outer circle of the installation base 3 is equal to that of the outer circle of the installation upper cover 4, and the installation base 3 and the installation upper cover 4 are installed in a limiting mode through the upper end face of the cylindrical support column 34.
The second outward flanging of the optical fiber ring base 5 is attached to the second inward flanging of the optical fiber ring inner cover 7, and the first inward flanging of the optical fiber ring base 5 and the first outward flanging of the optical fiber ring inner cover 7 are attached to an annular cavity formed between the optical fiber ring base 5 and the optical fiber ring inner cover 7 and used for placing the optical fiber ring coil 6.
The mounting flange 1, the outer cover 2, the mounting base 3 and the mounting upper cover 4 are made of soft magnetic alloy with high magnetic conductivity, preferably iron-nickel alloy, the mounting flange 1 and the outer cover 2 are made of 1J85 materials, and the mounting base 3 and the mounting upper cover 4 are made of 1J79 materials.
The optical fiber ring base 5 and the optical fiber ring inner cover 7 are both made of non-metal materials, preferably, the non-metal materials are ceramic materials with lower thermal expansion coefficient and lower thermal conductivity coefficient, and the linear expansion coefficient of the ceramic materials is less than or equal to 8 multiplied by 10 -6 K, thermal conductivity less than or equal to 2W/(m.K);
the wall thickness of the mounting flange 1 is 1-1.5 mm, the wall thickness of the outer cover 2 is 1-1.5 mm, the wall thickness of the mounting base 3 is 1-1.5 mm, and the wall thickness of the mounting upper cover 4 is 0.8-1 mm.
The clearance between the mounting flange 1 and the outer cover 2 is 0.2-0.5 mm, the clearance between the mounting base 3 and the optical fiber ring base 5 is 0.5-0.8 mm, and the clearance between the mounting base 3 and the optical fiber ring inner cover 7 is 0.5-0.8 mm.
The outer surfaces of the mounting flange 1 and the outer cover 2 are coated with ERB-2 thermal control black paint, and the hemispherical emissivity coefficient epsilon Η ≧ 0.85.
After the turnups of the optical fiber ring inner cover 7 and the optical fiber ring base 4 are mutually attached, the optical fiber ring inner cover and the turnups of the optical fiber ring base 4 are connected by adopting a laser sealing welding technology, so that a gap caused by mechanical installation is avoided, and the structure is simpler, the volume is smaller, and the weight is lighter.
In summary, the invention relates to an ultra-high precision optical fiber gyroscope structure, an outer cover is fixed on an installation base through a screw, a Y waveguide is fixed on the installation base through a screw, and an installation upper cover is fixed on the installation base through a screw and a side laser seal welding; the mounting base is fixed on the mounting flange through silicon rubber filling; the optical fiber ring assembly comprises an optical fiber ring base, an optical fiber ring coil and an optical fiber ring inner cover, wherein the optical fiber ring coil is fixedly arranged on the optical fiber ring base through epoxy glue, the optical fiber ring inner cover is fixed on the optical fiber ring base through silicon rubber, and the optical fiber ring assembly is fixedly arranged on the installation base through silicon rubber filling.
The invention realizes the design method of the ultra-high precision optical fiber gyroscope structure, skillfully arranges the optical fiber gyroscope structure, adopts the double-layer magnetic shielding design of the optical fiber ring assembly, provides effective magnetic field shielding for the optical fiber ring coil, and prevents the optical fiber ring coil from being interfered by a magnetic field. According to the material and the structural characteristics of the magnetic shielding combination, when the magnetic shielding material is selected, the magnetic material 1J79 with a higher magnetic saturation value is selected for the shielding layer mounting base and the mounting upper cover which are close to the magnetic source, and the magnetic material 1J85 with relatively higher magnetic permeability is adopted for the second layer mounting flange and the outer cover. When the double-layer magnetic shield is used, the metal layers are not in close contact with each other, but a certain gap is reserved, so that the mounting accuracy and the high efficiency of the magnetic shield are ensured. Laser encapsulation welding is adopted to the fiber ring subassembly, the gap that mechanical installation leads to has been avoided, make fiber ring coil seal in a space, reduce the fiber ring coil temperature gradient that arouses because of the air convection, and the thermal-insulated design between multilayer structure design and the multilayer structure can slow down the influence of ambient temperature change to fiber ring coil simultaneously, slows down the rate of change of temperature to fiber ring coil, and fiber ring coil rapid thermal balance's design method has promoted the precision of fiber gyroscope under temperature environment. The uniform and symmetrical structural design of the invention can counteract the influence of Shupe error on the gyro precision, the modularization and the componentization can be independently assembled, the assembly manufacturability is good, the assembly process is simplified, and the ultrahigh stability of the structure and the performance of the optical fiber gyro is realized.
Example 1
Fig. 1 shows a schematic structural diagram of the optical fiber gyroscope of the present invention, which includes a mounting flange 1, an outer cover 2, a mounting base 3, a mounting upper cover 4, an optical fiber ring base 5, an optical fiber ring coil 6, an optical fiber ring inner cover 7, and a Y waveguide 8.
As shown in fig. 2, which is a schematic structural diagram of the mounting flange 1 of the present invention, the mounting flange 1 has a bearing function, is in an annular cylindrical structure, has a bridge lap joint design in the middle, and has sufficiently high structural natural frequency corresponding to a flange annular groove and a flange linear groove, respectively, so as to reduce the mounting error influence caused by the deformation of a structural member. The wall thickness of the mounting flange 1 is 1-1.5 mm, in this embodiment 1.5mm. The installation lug 11 is by 3, and 6 screw holes that distribute altogether are used for installing dustcoat 2, and dustcoat 2 is packed into mounting flange 1 from one end and is formed enclosed construction in it, and mounting flange 1 is equipped with the flange ring channel 12 that matches with installation base 3 for fixed mounting base 3, and the internal surface of mounting flange 1 has outlet groove 13, is used for optic fibre ring coil tail optical fiber to pass through to the gyroscope surface. 3 installation lugs 11 punishment in annular inner chamber are equipped with 3 through-holes 14 respectively, and its main effect is the installation interface that the gyroscope is connected with external structure spare or other equipment.
As shown in fig. 3, which is a schematic structural diagram of the mounting base 3 of the present invention, 4 threaded holes 31 are distributed at a middle straight line groove of the mounting base 3 for mounting the Y waveguide 8, the straight line groove is surrounded by two parallel baffles and a bottom plate connected with the baffles, a fiber routing groove 32 is formed on the mounting base 3 for a tail fiber to enter a circuit mounting surface, an annular groove 33 of the mounting base 3 is used for fixing the optical fiber ring base 5, and 2 cylindrical pillars 34 with threaded holes are arranged at the middle straight line groove of the mounting base 3 for fixing with the mounting upper cover 4. The wall thickness of the mounting base 3 is 1 to 1.5mm, 1mm in this embodiment.
As shown in fig. 4, which is a structural cross-sectional view of a fiber ring assembly, the fiber ring assembly includes a fiber ring base 5, a fiber ring inner cover 7 and a fiber ring coil 6; the second outward flanging of the optical fiber ring base 5 is attached to the second inward flanging of the optical fiber ring inner cover 7, the first inward flanging of the optical fiber ring base 5 is attached to the first outward flanging of the optical fiber ring inner cover 7, an optical fiber ring coil 6 is placed in an annular cavity formed between the optical fiber ring base 5 and the optical fiber ring inner cover 7, and a fiber passing hole is reserved in the optical fiber ring inner cover 7 and used for enabling tail fibers to enter a light path assembly face. The mounting base is fixed on the mounting flange through silicon rubber filling.
Fig. 5 shows a first-order modal analysis diagram of the mounting base 3 according to the present invention. It can be known from the figure that the resonance position of the mounting base 3 is at the middle baffle plate and far away from the optical fiber loop coil, so that the mounting error of the optical fiber gyroscope is reduced.
The optical fiber ring base 5 and the optical fiber ring inner cover 7 are made of non-metallic materials and ceramic materials with lower thermal expansion coefficient and lower thermal conductivity coefficient. Because the optical fiber for winding the optical fiber loop coil is composed of an optical fiber core, a cladding, stress and a coating layer, the heat transfer optical performance of each part is similar, in order to reduce the extrusion and pulling stress generated by expansion with heat and contraction with cold between a structural member and the optical fiber, materials with the thermal conductivity coefficient and the expansion coefficient similar to those of the optical fiber are selected, meanwhile, the influence of the environmental temperature change on the optical fiber loop coil can be reduced by the multi-layer structure design and the heat insulation design among the multi-layer structures, the temperature change rate of the optical fiber loop coil is reduced, and the precision of the optical fiber gyroscope in the temperature environment is improved by the design method of the rapid thermal balance of the optical fiber loop coil.
The invention considers that the magneto-optic Faraday effect causes the phase difference of the fiber-optic gyroscope under the action of the geomagnetic field and influences the zero-bias performance of the output of the gyroscope, so the design of double-layer magnetic shielding of the fiber-optic ring is adopted, effective magnetic field shielding is provided for the fiber-optic ring coil, and the fiber-optic ring coil is prevented from being interfered by the magnetic field. According to the material and the structural characteristics of the magnetic shielding combination, when the material of the double-layer shielding is selected, the 1J79 material with a higher magnetic saturation value is selected for the shielding layer mounting base and the mounting upper cover which are close to the magnetic source, the 1J85 material with relatively higher magnetic permeability is adopted for the second layer mounting flange and the outer cover, the iron-nickel alloy with excellent comprehensive performance is selected for the magnetic shielding material, the iron-nickel alloy has high initial magnetic permeability and saturation magnetic permeability in a weak magnetic field and low coercive force, belongs to high-nickel alloy in the iron-nickel soft magnetic alloy, and can meet the magnetic shielding requirement of the optical fiber gyroscope. When the double-layer shielding is used, a certain gap is reserved between the metal layers instead of being tightly contacted, so that the mounting accuracy and the magnetic shielding efficiency are ensured. The clearance between the mounting flange 1 and the outer cover 2 is 0.2-0.5 mm, in this embodiment 0.5mm, and the clearance between the mounting base 3 and the mounting flange 3 is 0.5-0.8 mm, in this embodiment 0.6mm.
The amount of silicone rubber added in this example was 20g and the amount of epoxy rubber was 5g.
The invention prepares a film layer with high emissivity and hemispherical radiation coefficient epsilon on the outer surfaces of the mounting flange 1 and the outer cover 2 Η 0.85, the heat radiation channel is added, and the high-efficiency outer layer heat protection accelerates the heat to the outsideRadiation, and the precision of the optical fiber gyroscope in a temperature environment is improved.
In this embodiment, the height of the gyroscope can reach 35mm, the diameter can reach 252mm, the precision can reach three ten-thousandth, and the gyroscope has smaller size and higher precision.
The invention has the advantages of independent assembly of modularization and modularization design, good assembly manufacturability, simplified assembly process, ultra-high precision structural design and installation method, and realization of ultra-high stability of the structure and performance of the optical fiber gyroscope.
The invention has been described in detail with reference to specific embodiments and illustrative examples, but the description is not intended to be construed in a limiting sense. Those skilled in the art will appreciate that various equivalent substitutions, modifications or improvements may be made to the embodiments and implementations of the invention without departing from the spirit and scope of the invention, and are within the scope of the invention. The scope of the invention is defined by the appended claims.
Those skilled in the art will appreciate that those matters not described in detail in the present specification are well known in the art.
Claims (10)
1. An ultra-high precision optical fiber gyroscope structure comprises an optical fiber loop coil (6) and a Y waveguide (8), and is characterized by further comprising a mounting flange (1), an outer cover (2), a mounting base (3), a mounting upper cover (4), an optical fiber loop base (5) and an optical fiber loop inner cover (7);
the optical fiber ring base (5) and the optical fiber ring inner cover (7) form a closed first annular cavity, and an optical fiber ring coil (6) is fixedly installed in the first annular cavity;
the mounting base (3) is provided with an annular groove and a linear groove, and two ends of the linear groove are respectively connected with the side wall of the inner ring of the annular groove; the installation upper cover (4) is matched with an annular groove and a linear groove arranged on the installation base (3) to form a second annular cavity and a first linear cavity, the optical fiber ring base (5) and the optical fiber ring inner cover (7) are accommodated in the second annular cavity, and a Y waveguide (8) is fixedly installed in the first linear cavity;
the mounting flange (1) is provided with a groove matched with the mounting base (3), and the outer cover (2) and the mounting flange (1) are matched to form a closed inner cavity for accommodating the mounting upper cover (4) and the mounting base (3);
the mounting flange (1), the outer cover (2), the mounting base (3) and the mounting upper cover (4) are made of soft magnetic alloy; the mounting flange (1) and the outer cover (2) are made of 1J85 materials, and the mounting base (3) and the mounting upper cover (4) are made of 1J79 materials;
the optical fiber ring base (5) and the optical fiber ring inner cover (7) are both made of non-metal materials; the optical fiber ring base (5) and the optical fiber ring inner cover (7) both adopt the linear expansion coefficient of less than or equal to 8 multiplied by 10 -6 K, thermal conductivity less than or equal to 2W/(m.K).
2. The ultra-high precision fiber optic gyroscope structure according to claim 1, characterized in that the cross section of the first annular cavity formed by the fiber ring base (5) and the fiber ring inner cover (7) is rectangular; the optical fiber ring base (5) comprises a first side wall and a second side wall which are perpendicular to each other; the optical fiber ring inner cover (7) comprises a third side wall and a fourth side wall which are perpendicular to each other, the first side wall and the third side wall are parallel, the first side wall and the fourth side wall are respectively provided with a first inward flanging and a first outward flanging, and the second side wall and the third side wall are respectively provided with a second outward flanging and a second inward flanging; and the first inner flanging, the first outer flanging and the second outer flanging are bonded together and then laser seal welding is carried out.
3. The ultra-high precision optical fiber gyroscope structure according to claim 1, wherein a cylindrical pillar (34) is arranged in a linear groove formed in the mounting base (3), an upper end surface of the cylindrical pillar (34) is used for supporting and limiting the mounting upper cover (4), a threaded hole is formed in the cylindrical pillar (34), and a screw is matched with the threaded hole to fixedly connect the mounting upper cover (4) and the mounting base (3); and the upper mounting cover (4) is fixedly connected with the mounting base (3) and then laser seal-welded.
4. The ultra-high precision fiber optic gyroscope structure according to claim 1, characterized in that the mounting flange (1) is provided with a flange annular groove and a flange straight line groove matching with the mounting base (3); the side wall of the inner ring of the flange annular groove is provided with a mounting lug (11) protruding towards the circle center of the flange annular groove; the outer cover (2) extends to form a flanging matched with the mounting lug (11), and the mounting lug (11) is matched with the flanging to realize the fixed connection of the mounting flange (1) and the outer cover (2).
5. The ultra-high precision fiber optic gyroscope structure according to claim 4, characterized in that the number of said mounting lugs (11) is greater than or equal to 3; each mounting lug (11) is provided with 2 threaded holes for matching with a turned-over edge arranged on the outer cover (2); each mounting lug (11) is provided with 1 through hole for realizing the connection of the gyroscope and other external structures.
6. The ultra-high precision optical fiber gyroscope structure according to claim 1, wherein the inner fiber loop cover (7) is provided with a fiber feeding hole for the tail fiber to enter a linear groove arranged on the mounting base (3); the mounting base (3) is provided with a fiber running groove (32) for the tail fiber to be output; and the mounting flange (1) is provided with an outlet groove (13) for transition of the tail fiber of the optical fiber loop coil (6) to the outer surface of the gyroscope.
7. An ultra-high precision fiber optic gyroscope structure as claimed in claim 1, characterized in that the fiber loop coil (6) is bonded to the fiber loop base (5) by epoxy glue; the mounting base (3) is fixed on the mounting flange (1) through silicon rubber filling.
8. An ultra-high precision fiber optic gyroscope structure as claimed in claim 1, characterized in that the diameter of the outer circle of the mounting base (3) is equal to the diameter of the outer circle of the mounting top cover (4).
9. The ultra-high precision fiber optic gyroscope structure according to claim 1, wherein the wall thickness of the mounting flange (1) is 1 to 1.5mm, the wall thickness of the outer cover (2) is 1 to 1.5mm, the wall thickness of the mounting base (3) is 1 to 1.5mm, and the wall thickness of the mounting upper cover (4) is 0.8 to 1mm; the gap between the mounting flange (1) and the side wall of the outer cover (2) ranges from 0.2 to 0.5mm, the gap between the mounting base (3) and the side wall of the optical fiber ring base (5) ranges from 0.5 to 0.8mm, and the gap between the mounting base (3) and the side wall of the optical fiber ring inner cover (7) ranges from 0.5 to 0.8mm.
10. The ultra-high precision fiber optic gyroscope structure according to claim 1, characterized in that the mounting flange (1) and the outer surface of the housing (2) are coated with ERB-2 thermal control black paint, and the ERB-2 thermal control black paint has a hemispherical emissivity epsilon Η And was 0.85.
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| CN106595629A (en) * | 2016-12-09 | 2017-04-26 | 上海新跃联汇电子科技有限公司 | Optical fiber gyroscope with sensitive axial direction parallel to mounting surface |
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| US5327215A (en) * | 1991-10-24 | 1994-07-05 | Bodenseewerk Geratetechnik Gmbh | Sensor having optical passive ring resonator using sagnac effect |
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