CN103674005A - Magnetic shielding case of fiber-optic gyroscope - Google Patents
Magnetic shielding case of fiber-optic gyroscope Download PDFInfo
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- CN103674005A CN103674005A CN201210331206.3A CN201210331206A CN103674005A CN 103674005 A CN103674005 A CN 103674005A CN 201210331206 A CN201210331206 A CN 201210331206A CN 103674005 A CN103674005 A CN 103674005A
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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
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K9/00—Screening of apparatus or components against electric or magnetic fields
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Abstract
The invention belongs to the fiber-optic gyroscope technology, and relates to a magnetic shielding case of a fiber-optic gyroscope, which is reusable, and easy to assemble and disassemble. The magnetic shielding case of the fiber-optic gyroscope comprises an upper shielding case, a lower shielding case, a base, a skeleton and a fiber-optic ring, wherein an upper shielding case inner ring is located between the inner cylindrical surface of the skeleton and a lower shielding case side wall, the fiber-optic ring surrounds the outer periphery of the skeleton and is closed by the upper shielding case. An upper shielding case cover plate, the upper shielding case inner ring, the lower shielding case side wall, a lower shielding case bottom plate, an upper shielding case bottom plate and an upper shielding case outer ring form a closed magnetic circuit, the magnetic sensitive part in a fiber-optic gyroscope optical path can be right surrounded by the closed magnetic circuit, and the closed magnetic circuit is perpendicular to the spreading direction of light, thus realizing high-performance magnetic shielding and further playing a role in protecting the fiber-optic ring. In addition, without the use of modes of gluing or welding and the like, all parts are assembled only by using fasteners in the assembling process of the magnetic shielding case of the fiber-optic gyroscope, the shielding case is simple and easy to assemble and disassemble.
Description
Technical field
The invention belongs to fiber-optics gyroscope, relate to a kind of optical fibre gyro magnetic shielding cover of reusable, easy installing/dismounting.
Background technology
Optical fibre gyro is a kind of optical gyroscope based on Sagnac effect, generally comprises fiber optic loop and mounting framework thereof, light source, coupling mechanism, integrated optical modulator, detector etc.Magnetic field of the earth and environmental magnetic field by Faraday effect, Kerr effect to optical fibre gyro particularly the performance of high accuracy gyroscope will produce considerable influence.
Many weeks, magnetic field can make positive and negative two-beam generation in optical fibre gyro differ poor Δ φ by Faraday effect,
ζ in formula
0for the Faraday of light, its size is that magnetic field intensity and your constant of Vad are long-pending; R is fiber radius; Δ β is the double refractive inde of optical fiber; θ
0deflection for magnetic field.Therefore, magnetic field will produce additional components in optical fibre gyro output, and this value is irrelevant with rotational rate gyroscope.Test shows, when magnetic shielding cover is not installed, optical fibre gyro output ω and magnetic induction density B are linear:
ω＝K·B+B
0
In formula, ω is optical fibre gyro output, B
0for optical fibre gyro zero partially.Particularly, for high-precision optical fiber gyro, the error that magnetic field of the earth produces usually surpasses gyro intrinsic zero value partially, so must carry out magnetic shielding to gyro magnetic-field-sensitive position.For optical fibre gyro, mainly for direct current or low frequency magnetic field, carry out magnetic shielding, magnetic shielding material provides low magnetic resistance passage in magnetic field, and the guiding magnetic line of force, by self, makes to reduce as far as possible by the magnetic field of sensitive part.The actual general upper and lower two groups of magnetic shielding covers that high permeability materials are made that adopt, partly surround gyro light path to magnetic-field-sensitive, can weaken influence of magnetic field.
Between upper and lower magnetic shielding cover, generally adopt bonding or be welded and fixed, causing dismounting difficulty in debugging, maintenance process.Magnetic shielding material is selected magnetically soft alloy conventionally, such material magnetic property after stress annealing is processed is increased dramatically, also cause their counter stresses and collision very responsive simultaneously, therefore install, the operation such as issuable in unloading process collided with, extruding will cause magnetic shielding cover hydraulic performance decline, and then affect the precision of optical fibre gyro.
Summary of the invention
Object of the present invention: in order to reduce the sensitivity of optical fibre gyro to environmental magnetic field, improve the environmental suitability of optical fibre gyro, the invention provides a kind of reusable, easy installing/dismounting and magnetic shield performance is good, environmental suitability is strong optical fibre gyro magnetic shielding cover.
This device consists of upper and lower magnetic shielding cover, and optical fibre gyro light path magnetic susceptibility is partly surrounded.This device also can be applicable to other optical gyroscopes to magnetic-field-sensitive such as ring laser gyro.
The invention provides following technical scheme: a kind of optical fibre gyro magnetic shielding cover, it comprises radome, lower radome, pedestal, skeleton, fiber optic loop, described lower radome is comprised of lower radome base plate and lower shield sidewall, in the middle of described lower radome base plate, be provided with pilot hole, described lower shield sidewall annular is arranged on the pilot hole of lower radome base plate, described upper radome comprises radome base plate, upper radome outer shroud, upper radome cover plate, ring in upper radome, in the middle of described upper radome base plate, be provided with the mounting hole of installing for fiber optic loop, edge is provided with the through hole for upper and lower radome assembling, described upper radome cover plate is the middle thin-walled flat board that offers pilot hole, described upper radome outer shroud thin-wall tubular structure, upper end is connected with lower radome base plate, the excircle of lower end and upper radome cover plate joins, in upper radome, ring is also thin-wall tubular structure, upper end is connected with upper radome cover plate pilot hole circumference, lower end is installed and is coordinated with lower shield sidewall, on described pedestal, be processed with cylinder boss, this cylinder boss diameter and lower radome center-hole diameter match, described skeleton is thin-walled tubular structure, and in ring diameter and upper radome, ring matches in it, on excircle around finger fiber optic loop.
In lower shield sidewall and upper radome, ring all offers the group groove of the circle distribution of mutual coupling.
In upper radome cover plate pilot hole, have some flanges with through hole, the through hole on this flange and the erection column on pedestal cylinder boss match.
In lower radome bottom edge and susceptor edges, be processed with for coordinating the countersunk of installation.
Upper radome base plate and lower radome bottom edge offer for coordinating the through hole of installation.
After installation, in upper radome, ring is between gyro skeleton inner cylinder face and lower shield sidewall, between ring and lower shield sidewall, be transition fit in upper radome or be the interference fit in magnetic shielding material elastic range, described upper radome cover plate, the interior ring of upper radome, lower shield sidewall, lower radome base plate, upper radome base plate, upper radome outer shroud will form closed magnetic circuit.
In described upper radome cover plate, upper radome, ring, lower shield sidewall, lower radome base plate, upper radome base plate, upper radome outer shroud process by the magnetically soft alloy sheet material of high magnetic permeability, and the correspondence that distributes is welded into radome and lower radome.
The technique effect that the present invention produces: the upper and lower radome of the present invention processes for the magnetically soft alloy by high magnetic permeability; wherein; upper radome and lower radome form the closed magnetic circuit of the vertical light direction of propagation outward in optical fibre gyro light path; realize high performance magnetic shielding, can also play in addition the effect of protection fiber optic loop.By machining tolerance, control and make in upper radome between ring and lower shield sidewall as transition fit or be the interference fit in magnetic shielding material elastic range, reduce to greatest extent magnetic resistance between the two, and prevent that both from producing collision.Meanwhile, optical fibre gyro magnetic shielding cover of the present invention is only used securing member to complete the assembling of each parts in assembling process, do not make to stick with glue or the mode such as welding, radome assembling, dismantle simple.In addition, introduce hardly stress in gyro assembly, unloading process radome, radome still can maintain very high Magnetic Shielding Effectiveness, therefore has larger actual application value.
Accompanying drawing explanation
Fig. 1 is optical fibre gyro magnetic shielding cover sectional arrangement drawing of the present invention, wherein, and the upper radome of 1-, radome under 2-, 3-pedestal, 4-skeleton, 5-fiber optic loop, 6-screw, 7-gyro cover plate.
Fig. 2 is optical fibre gyro magnetic shielding cover assembling plan view of the present invention, wherein, and the upper radome of 1-, 3-pedestal, 6-screw, 7-gyro cover plate.
Fig. 3 is optical fibre gyro magnetic shielding cover assembling explosive view of the present invention, wherein, and the upper radome of 1-, radome under 2-, 3-pedestal, 4-skeleton, 5-fiber optic loop, 6-screw, 7-gyro cover plate, 8-threaded hole, 9-countersunk, 10-unthreaded hole.
Fig. 4 is shielding case structure schematic diagram on optical fibre gyro magnetic shielding cover of the present invention, wherein, and 9-countersunk, 10-unthreaded hole, radome base plate under 11-, shield sidewall under 12-.
Shielding case structure schematic diagram under Fig. 5 optical fibre gyro magnetic shielding cover of the present invention, wherein, 10-unthreaded hole, the upper radome base plate of 13-, the upper radome outer shroud of 14-, the upper radome cover plate of 15-, ring in the upper radome of 16-.
Embodiment
Below by embodiment, the present invention is described in further detail:
Please refer to Fig. 1-Fig. 5, optical fibre gyro magnetic shielding cover of the present invention comprises radome 1, lower radome 2, pedestal 3, skeleton 4, fiber optic loop 5 and gyro cover plate 7.
Described lower radome 2 is comprised of lower radome base plate 11 and lower shield sidewall 12.As shown in Figure 4, in the middle of described lower radome base plate 11, be provided with mounting hole, edge is provided with some for the fixing punching press counterbore 9 of lower radome 2 and pedestal 3, and some through holes 10 for upper and lower radome assembling.Described lower shield sidewall 12 annulars are arranged on the mounting hole of lower radome base plate 11, and in lower shield sidewall 12, are processed with 1 group of groove, prevent that lower shield sidewall 12 from producing and interfering with skeleton 4.Actually add man-hour, first lower radome base plate 11 and lower shield sidewall 12 process profile, then by curved, lower shield sidewall 12 diameters are worked in margin tolerance, then welded profile is fixed.Finally, lower shield sidewall 12 has been welded to lower radome 2 processing with lower radome base plate 11, to cut down finished cost, reduced waste of material.
Described upper radome 1 forms by light sheet material welding processing equally.Refer to Fig. 5, described upper radome 1 comprises ring 16 in radome base plate 13, upper radome outer shroud 14, upper radome cover plate 15, upper radome.In the middle of described upper radome base plate 13, be provided with the mounting hole matching with fiber optic loop, edge is provided with the through hole 10 for upper and lower radome.Described upper radome cover plate 15, for the middle thin-walled flat board that offers mounting hole, is provided with flange 17 in mounting hole.Described upper radome outer shroud 14 thin-wall tubular structures, upper end is connected with lower radome base plate, and the excircle of lower end and upper radome cover plate 15 joins.In upper radome, ring 16 is also thin-wall tubular structure, and upper end is connected with upper radome cover plate 15 mounting hole circumference, and lower end offers group groove, and the groove of the shape of this groove and position and lower shield sidewall matches.Actually add man-hour, first process External Shape, then by curved, by encircling 16 diameters in upper radome outer shroud 14 and upper radome, be worked in margin tolerance, then profile is fixed in welding.Finally, ring 16 the same radome base plates 13 and upper radome cover plate 15 in upper radome outer shroud 14 and upper radome have been welded to upper radome 1 processing.
Described pedestal 3 is processing oil cylinder boss on square plate, and this cylinder boss diameter and lower radome center-hole diameter match.And susceptor edges is processed with countersunk 9, machining screw in hole, on lower radome 2, the countersunk 9 of processing can be installed in pedestal 3 countersunks 9 just.
The interior flanged thin-walled tubular structure of described skeleton 4, in it, in ring diameter and upper radome, ring matches, and on each flange, processes 1 through hole 18, for being linked and packed with pedestal cylinder boss.Fiber optic loop is wound on skeleton outer circumference surface, and is encapsulated by upper radome outer shroud.Described gyro cover plate 7 is for to be arranged on radome cover plate outer end for sealing and fixing plectane.
After each parts are installed, in upper radome, ring is just between gyro skeleton inner cylinder face and lower shield sidewall, between ring and lower shield sidewall, be transition fit in upper radome or be the interference fit in magnetic shielding material elastic range, guarantee that closed magnetic circuit magnetic resistance is minimum, also prevent from producing mutually and clashing between the interior ring of radome and lower shield sidewall simultaneously.Go up like this ring, lower shield sidewall, lower radome base plate, upper radome base plate, upper radome outer shroud in radome cover plate, upper radome and will form closed magnetic circuit.This closed magnetic circuit partly surrounds magnetic susceptibility in optical fibre gyro light path just, environmental magnetic field by this magnetic circuit after magnetic induction density necessarily decayed, so also corresponding reducing of the error that produces in gyro output of environmental magnetic field.
In the present invention, radome and lower radome surround fiber optic loop, have formed the closed loop magnetic circuit of the vertical light direction of propagation; Environmental magnetic field is by after radome, and magnetic induction density is decayed, and magneto-optic effect reduces at gyro output quantity proportion, and gyro performance is improved.Magnetic shielding cover only can complete assembling by securing member, assembling process is simple, also facilitate gyro debugging and reprocess, reduced the probability to magnetic shielding material introducing stress in said process, so magnetic shielding cover can keep higher magnetic permcability, obvious to environmental magnetic field attenuating simultaneously.Upper radome and lower radome can adopt magnetically soft alloy light sheet to carry out welding processing, with machining, compare, and which has reduced expensive magnetically soft alloy material waste in process, has shortened the process-cycle, has reduced processing cost.The magnetic circuit that upper radome and lower radome form only surrounds fiber optic loop and skeleton, only will in gyro, magnetic-field-sensitive partly be surrounded, rather than by the whole encirclement of gyro; In addition gyro pedestal and skeleton do not adopt magnetically soft alloy material processing, upper radome outer shroud has substituted gyro outer cover, all reduced the larger magnetically soft alloy material consumption of density, thereby reduced gyro weight, therefore the present invention is a kind of very feasible optical fibre gyro magnetic shielding scheme, has higher using value.
Claims (7)
1. an optical fibre gyro magnetic shielding cover, it is characterized in that: comprise radome (1), lower radome (2), pedestal (3), skeleton (4), fiber optic loop (5), described lower radome (2) is comprised of lower radome base plate (11) and lower shield sidewall (12), in the middle of described lower radome base plate (11), be provided with pilot hole, described lower shield sidewall (12) annular is arranged on the pilot hole of lower radome base plate (11), described upper radome (1) comprises radome base plate (13), upper radome outer shroud (14), upper radome cover plate (15), ring (16) in upper radome, in the middle of described upper radome base plate (13), be provided with the mounting hole of installing for fiber optic loop, edge is provided with the through hole (10) for upper and lower radome assembling, described upper radome cover plate (15) is the middle thin-walled flat board that offers pilot hole, described upper radome outer shroud (14) thin-wall tubular structure, upper end is connected with lower radome base plate, the excircle of lower end and upper radome cover plate (15) joins, in upper radome, ring (16) is also thin-wall tubular structure, upper end is connected with upper radome cover plate (15) pilot hole circumference, lower end is installed and is coordinated with lower shield sidewall, described pedestal is processed with cylinder boss on (3), and this cylinder boss diameter and lower radome center-hole diameter match, described skeleton (4) is thin-walled tubular structure, and in ring diameter and upper radome, ring matches in it, on excircle around finger fiber optic loop.
2. optical fibre gyro magnetic shielding cover according to claim 1, is characterized in that: in lower shield sidewall (12) and upper radome, ring (16) all offers the group groove of the circle distribution of mutual coupling.
3. optical fibre gyro magnetic shielding cover according to claim 2, is characterized in that: in upper radome cover plate pilot hole, have some flanges with through hole, the through hole on this flange and the erection column on pedestal cylinder boss match.
4. optical fibre gyro magnetic shielding cover according to claim 3, is characterized in that: on lower radome 2 bottom edges and pedestal 3 edges, be processed with for coordinating the countersunk of installation.
5. optical fibre gyro magnetic shielding cover according to claim 4, is characterized in that: upper radome base plate and lower radome bottom edge offer for coordinating the through hole of installation.
6. according to the optical fibre gyro magnetic shielding cover described in claim 1 to 5 any one, it is characterized in that: after installation, in upper radome, ring is between gyro skeleton inner cylinder face and lower shield sidewall, between ring and lower shield sidewall, be transition fit in upper radome or be the interference fit in magnetic shielding material elastic range, described upper radome cover plate, the interior ring of upper radome, lower shield sidewall, lower radome base plate, upper radome base plate, upper radome outer shroud will form closed magnetic circuit.
7. optical fibre gyro magnetic shielding cover according to claim 6, it is characterized in that: in described upper radome cover plate, upper radome, ring, lower shield sidewall, lower radome base plate, upper radome base plate, upper radome outer shroud process by the magnetically soft alloy sheet material of high magnetic permeability, and the correspondence that distributes is welded into radome and lower radome.
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| CN201210331206.3A CN103674005B (en) | 2012-09-07 | 2012-09-07 | A kind of optical fibre gyro magnetic shielding cover |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103994761A (en) * | 2014-05-15 | 2014-08-20 | 北京航空航天大学 | Fiber-optic gyroscope double-layer magnetic shielding sensitive ring assembly with airtight cavity, and assembling method of assembly |
| CN104567852A (en) * | 2015-01-23 | 2015-04-29 | 北京航天时代光电科技有限公司 | Airtight structural component of optical fiber gyroscope and gas tightness test method of airtight structural component |
| CN104596498A (en) * | 2015-02-03 | 2015-05-06 | 中国电子科技集团公司第四十六研究所 | Encapsulation method of optical fiber sensing coil |
| CN106908051A (en) * | 2015-12-23 | 2017-06-30 | 北京自动化控制设备研究所 | A kind of high-precision optical fiber gyro bilayer magnetic shielding cover and its heat treatment method |
| CN109443339A (en) * | 2018-12-10 | 2019-03-08 | 河北汉光重工有限责任公司 | A kind of small-sized closed-loop fiber optic gyroscope of photoelectric integral type |
| CN109443340A (en) * | 2018-12-10 | 2019-03-08 | 河北汉光重工有限责任公司 | A kind of device for fiber-optic gyroscope light path system docking |
| CN113804177A (en) * | 2021-08-20 | 2021-12-17 | 北京航天时代光电科技有限公司 | Ultra-high precision optical fiber gyroscope structure |
| CN116026307A (en) * | 2023-03-30 | 2023-04-28 | 中国船舶集团有限公司第七〇七研究所 | Fiber optic gyroscope based on strong magnetic component |
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Cited By (12)
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| CN103994761A (en) * | 2014-05-15 | 2014-08-20 | 北京航空航天大学 | Fiber-optic gyroscope double-layer magnetic shielding sensitive ring assembly with airtight cavity, and assembling method of assembly |
| CN103994761B (en) * | 2014-05-15 | 2016-12-14 | 北京航空航天大学 | A kind of optical fibre gyro double-layer magnetic shielding sensing ring assembly with air-tight cavity and assemble method thereof |
| CN104567852A (en) * | 2015-01-23 | 2015-04-29 | 北京航天时代光电科技有限公司 | Airtight structural component of optical fiber gyroscope and gas tightness test method of airtight structural component |
| CN104567852B (en) * | 2015-01-23 | 2018-08-31 | 北京航天时代光电科技有限公司 | A kind of fibre optic gyroscope airtight construction part and its air tightness testing method |
| CN104596498A (en) * | 2015-02-03 | 2015-05-06 | 中国电子科技集团公司第四十六研究所 | Encapsulation method of optical fiber sensing coil |
| CN106908051A (en) * | 2015-12-23 | 2017-06-30 | 北京自动化控制设备研究所 | A kind of high-precision optical fiber gyro bilayer magnetic shielding cover and its heat treatment method |
| CN109443339A (en) * | 2018-12-10 | 2019-03-08 | 河北汉光重工有限责任公司 | A kind of small-sized closed-loop fiber optic gyroscope of photoelectric integral type |
| CN109443340A (en) * | 2018-12-10 | 2019-03-08 | 河北汉光重工有限责任公司 | A kind of device for fiber-optic gyroscope light path system docking |
| CN109443339B (en) * | 2018-12-10 | 2022-09-06 | 河北汉光重工有限责任公司 | Photoelectric integrated small closed-loop fiber optic gyroscope |
| CN113804177A (en) * | 2021-08-20 | 2021-12-17 | 北京航天时代光电科技有限公司 | Ultra-high precision optical fiber gyroscope structure |
| CN113804177B (en) * | 2021-08-20 | 2023-03-10 | 北京航天时代光电科技有限公司 | Ultra-high precision optical fiber gyroscope structure |
| CN116026307A (en) * | 2023-03-30 | 2023-04-28 | 中国船舶集团有限公司第七〇七研究所 | Fiber optic gyroscope based on strong magnetic component |
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