CN106595704B - A kind of multipolarization optical fibre gyro ring winding method and structure - Google Patents
A kind of multipolarization optical fibre gyro ring winding method and structure Download PDFInfo
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Abstract
(1), one quaternary structure of coiling the present invention relates to a kind of winding methods of multipolarization optical fibre gyro ring, comprising the following steps:；(2), using a positive quaternary structure and a reversed quaternary structure around producing an octupole structure；(3), using a positive octupole structure and a reversed octupole structure around producing a ten sextupole structures；(4), using a ten sextupole structure of forward direction and a reversed ten sextupoles structure around producing 30 two-level structures.The arrangement form of this optical fibre gyro optical fiber loop further improves the temperature performance of optical fiber loop, especially temperature performance of the promotion optical fiber loop in asymmetric temperature environment.
Description
Technical field
The present invention relates to fiber-optics gyroscope field, especially a kind of multipolarization optical fibre gyro ring winding method and knot
Structure.
Background technique
Optical fibre gyro has high reliablity, impact resisting vibrating, service life length, starting speed as novel optical gyroscope instrument
The advantages that fast is spent, has been widely used in multiple military and civil field.But when the temperature of optical fibre gyro working environment is sent out
When changing, thermotropic non-heterogeneite will be generated in optical fibre gyro core component fiber annular sensor (referred to as: optical fiber loop)
Phase noise, i.e. SHUPE error.This error and the SAGNAC effect of optical fibre gyro perception earth rate cannot be distinguished, seriously
Reduce the actual detection precision of optical fibre gyro.Now such heat transfer property of fiber annular sensor has been carried out largely both at home and abroad
Theoretical research, be utilized respectively the symmetrical winding of quadrupole, the symmetrical winding in octupole and the symmetrical winding of ten sextupoles to optical fiber loop carry out around
System, to reduce the temperature error of optical fiber loop, and these coiling schemes are all in the relevant patent of application at home and abroad, even if
Using the existing symmetrical coiling scheme of ten sextupoles optimized the most (United States Patent, US005475774), fiber optic loop
Remaining temperature error is still very big in circle, seriously affects the temperature performance of high-precision optical fiber gyro.Especially in asymmetric temperature
It spends in environment, the temperature error inhibiting effect of the above method is had a greatly reduced quality.Therefore needing to be optimized design reduces fiber optic loop
Temperature error is enclosed, gyro temperature error is especially effectively reduced under the conditions of asymmetric temperature, is high-precision optical fiber gyro development
Where key technology in the process.
Summary of the invention
It is an object of the invention in place of making up the deficiencies in the prior art, provide it is a kind of by optical fiber loop temperature error from
It dissipates mathematical model to combine with finite element heat transfer model, has found and preferably inhibit optical fiber loop compared with the symmetrical winding method of ten sextupoles
The coiling scheme of temperature error.
The purpose of the present invention is what is realized by following technological means:
A kind of winding method of multipolarization optical fibre gyro ring, it is characterised in that: the following steps are included:
(1), one quaternary structure of coiling；
(2), using a positive quaternary structure and a reversed quaternary structure around producing an octupole structure；
(3), using a positive octupole structure and a reversed octupole structure around producing a ten sextupole structures；
(4), using a ten sextupole structure of forward direction and a reversed ten sextupoles structure around producing 30 two-level structures.
Moreover, step (1) described one quaternary structure of coiling method particularly includes: a continuous optical fiber is from its midpoint
Start, the optical fiber of two sides be wound on respectively two it is different divide on tow wheel, divide the optical fiber on tow wheel A in coiling ring the
One layer of each circle, the optical fiber divided on tow wheel B are used for the second layer of coiling ring, and the second layer is identical as the direction of first layer, and second
After the completion of layer coiling, still divide the optical fiber on tow wheel B using this, then coiling third layer optical fiber in opposite direction；Then, it recycles and divides
Optical fiber on tow wheel A, the 4th layer of this ring of coiling, coiling direction is identical as third layer, in this way, the light of optical fiber midpoint side
Fibre for complete first layer and the 4th layer each circle optical fiber coiling, and the optical fiber of the other side be used for complete two, 3 two layers around
System, the four of coiling layer optical fiber is commonly known as one " quadrupole " in this manner, if respectively indicated in optical fiber with "+" and "-"
The optical fiber of point two sides, then the structure of this quadrupole is "+--+", and the symmetrical winding of quadrupole is repeated more based on this quadrupole unit
The coiling of a quadrupole.
Moreover, step (2) described one octupole structure of coiling method particularly includes: reverse quaternary structure is introduced, wherein inverse
To quaternary structure, arrangement and step (1) the quaternary structure arrangement on the contrary, for "-++-"；With a positive quadrupole and one
Reverse quadrupole form most basic octupole unit "+--+- ++-", octupole pair can be completed in the coiling for repeating this multiple octupole unit
Claim coiling.
Moreover, step (3) described one ten sextupole structure of coiling method particularly includes: reverse octupole structure is introduced, wherein
Reverse octupole structure, arrangement and step (2) the octupole Structural assignments on the contrary, for "-++ -+--+", with a positive octupole
And a reverse octupole form ten most basic sextupole units "+--+- ++ -- ++ -+--+", repeat this multiple ten sextupoles unit
The symmetrical coiling of ten sextupoles can be completed in coiling.
Moreover, step (4) described one 30 two-level structure of coiling method particularly includes: reverse ten sextupoles structure is introduced,
Wherein reverse ten sextupoles structure, arrangement and step (3) the ten sextupole Structural assignments on the contrary, for "-++ -+-- ++ --+-+
+-", with ten sextupole of forward direction and reverse ten sextupole form 32 most basic pole units "+--+- ++ -- ++ -+--
+-++ -+-- ++ --+- ++-", 32 extremely symmetrical coilings can be completed in the coiling for repeating this multiple 32 pole unit.
Moreover, step (4) 30 two-level structures by multiple infinitesimal groups with the effect of temperature error self-compensating
At the infinitesimal is cross arrangement mode.
A kind of multipolarization optical fibre gyro ring of the winding method using multipolarization optical fibre gyro ring described in claim 1
Enclose winding structure, it is characterised in that: including multiple basic 32 pole units, each 32 pole unit is by a forward direction ten
Sextupole structure and a reverse ten sextupoles structure are constituted, Structural assignments be "+--+- ++ -- ++ -+--+- ++ -+-- ++ --+-+
+-”。
It is missed moreover, optical fiber loop is divided into multiple temperature that have in the way of cross arrangement by 30 two-level structures
The infinitesimal of poor self-compensating effect.
The advantages and positive effects of the present invention are:
1, the present invention is on the basis of forefathers' research, the further perfect discrete mathematics mould of optical fiber loop temperature error
Type establishes optical fiber loop heat transfer model using ANSYS finite element analysis software at the same time and combines, by both models into
It has gone accurate combination, various different coiling schemes is compared, this intellectual achievement is demonstrated according to theoretical analysis result
The winding of invention preferably inhibits optical fiber loop temperature error compared with the symmetrical winding method of ten sextupoles.And this scheme is different from the past
Symmetrical coiling scheme, the design of specific aim optical fiber arrangement can be carried out according to practical asymmetric temperature environment, therefore more practical
Application value.
2, this intellectual achievement is firstly introduced reverse " ten sextupoles " on the basis of forefathers' coiling symmetrical about " ten sextupoles "
Concept, and optical fiber loop is divided into multiple infinitesimals with the effect of temperature error self-compensating with " cross arrangement " mode,
And the arrangement by changing infinitesimal can effectively promote error rejection ability of the optical fiber loop in asymmetric temperature environment.And
It, can further targetedly using MATLAB and two Autocad of ANSYS and in known specific temperature environment
Change infinitesimal arrangement, reduces the temperature error of optical fiber loop.
Detailed description of the invention
Fig. 1 is optical fiber loop coiling schematic diagram by optical fiber midpoint；
Fig. 2 is the symmetrical coiling schematic diagram of quadrupole；
Fig. 3 is the symmetrical coiling schematic diagram in octupole；
Fig. 4 is the symmetrical coiling schematic diagram of ten sextupoles；
Fig. 5 is by two reciprocal 32 pole schematic diagrames formed of arranging；
Fig. 6 is the symmetrical coiling schematic diagram with temperature-compensating infinitesimal.
Specific embodiment
Describe the embodiment of the present invention in detail with reference to the accompanying drawing；It should be noted that the present embodiment be it is narrative, no
It is restrictive, this does not limit the scope of protection of the present invention.
To facilitate the understanding of the present invention, first to traditional symmetrical winding process of quadrupole, the symmetrical winding process in octupole and 16
Extremely symmetrical winding process is illustrated:
In optical fiber loop, a longer optical fiber is become the coil form of multilayer by coiling, wherein each layer of coiling is complete
At ring be made of several circle optical fiber.Current this optical fiber loop usually all carries out coiling using quadrupole symmetry approach.In order to
The optical fiber loop of four polar forms is formed, a continuous optical fiber is since its midpoint, as the optical fiber of Fig. 1, two sides are distinguished
Two are wound on different to divide on tow wheel.Divide tow wheel A for each circle of first layer in coiling ring, the optical fiber divided on tow wheel B is used
After the completion of the second layer of coiling ring, second layer coiling, still divide the optical fiber on tow wheel using this, then coiling in opposite direction
Three layers of optical fiber.Then, using dividing optical fiber on tow wheel A, the 4th layer of this ring of coiling, coiling direction and third layer phase
Together.In this way, the coiling of each circle optical fiber of the optical fiber of optical fiber midpoint side for completing first layer and the 4th layer, and the light of the other side
Fibre is for completing two, 3 two layers of coilings.Four layers of optical fiber of coiling are commonly known as one " quadrupole " in this manner.If with
"+" and "-" respectively indicate the optical fiber of optical fiber midpoint two sides, then the structure of this quadrupole is "+--+", the symmetrical winding of quadrupole with this one
Based on a quadrupole unit, the coiling of multiple quadrupoles is repeated.As shown in Fig. 2, different colours represent separation optical fiber midpoint two in figure
The optical fiber of side.
The symmetrical coiling scheme in octupole is to introduce reverse quaternary structure on this basis, wherein reverse quaternary structure, arrangement
With above-mentioned " quadrupole " Structural assignments on the contrary, for "-++-".Most basic eight are formed with a positive quadrupole and a reverse quadrupole
Pole unit "+--+- ++-", the coiling for repeating this multiple octupole unit can be completed, using the ring of the symmetrical coiling scheme in octupole
As shown in figure 3, different colours represent the optical fiber of separation optical fiber midpoint two sides in figure.The symmetrical coiling of more traditional quadrupole, octupole around
System can preferably promote the temperature performance of optical fiber loop.
On this basis, American scholar was introduced back into the concept of reverse " octupole ", and further upgraded to " ten in 1994
Sextupole " coiling, and successfully apply for a patent US005475774, structure be "+--+- ++ -- ++ -+--+", schematic diagram such as Fig. 4
It is shown.Different colours represent the optical fiber of separation optical fiber midpoint two sides in figure.
With the continuous improvement of optical fiber gyroscope precision, the temperature performance of existing fiber ring can no longer meet market to height
The demand of precision optical fiber gyro, it is therefore desirable to further promote the temperature performance of optical fiber loop.
The coiling scheme that this intellectual achievement is specifically invented is as follows: macroscopically introducing on the basis of " ten sextupoles " coiling " inverse
To ten sextupoles ", influence of the temperature error to optical fiber loop temperature performance is further decreased, and on this basis with " intersection row
Optical fiber loop is divided into multiple infinitesimals with the effect of temperature error self-compensating, and the row by changing infinitesimal by cloth " mode
Cloth can effectively promote error rejection ability of the optical fiber loop in asymmetric temperature environment.Schematic diagram is as shown in Figure 6.
The present invention has developed a kind of multipolarization optical fibre gyro ring winding structure, including multiple basic 32 pole units,
Each 32 pole unit is made of a ten sextupole structure of forward direction and a reverse ten sextupoles structure, and Structural assignments are
"+--+-++--++-+--+-++-+--++--+-++-".30 two-level structures are in the way of cross arrangement by fiber optic loop
Circle is divided into multiple infinitesimals with the effect of temperature error self-compensating.
The winding method of above-mentioned multipolarization optical fibre gyro toroidal ring structure, comprising the following steps:
(1), one quaternary structure of coiling；
A piece continuous optical fiber since its midpoint, the optical fiber of two sides be wound on respectively two it is different divide on tow wheel,
Divide the optical fiber on tow wheel A for each circle of first layer in coiling ring, the optical fiber divided on tow wheel B is used for the second of coiling ring
Layer, the second layer is identical as the direction of first layer, after the completion of second layer coiling, still divides the optical fiber on tow wheel B using this, then along opposite
Direction coiling third layer optical fiber；Then, recycle and divide optical fiber on tow wheel A, the 4th layer of this ring of coiling, coiling direction with
Third layer is identical, in this way, the optical fiber of optical fiber midpoint side is used to complete the coiling of each circle optical fiber of first layer and the 4th layer, and it is another
The optical fiber of side is used to complete two, 3 two layers of coilings, and the four of coiling layer optical fiber is commonly known as one " four in this manner
Pole ", if respectively indicating the optical fiber of optical fiber midpoint two sides with "+" and "-", the structure of this quadrupole is "+--+", and quadrupole is symmetrical
Winding repeats the coiling of multiple quadrupoles based on this quadrupole unit.
(2), using a positive quaternary structure and a reversed quaternary structure around producing an octupole structure；
Reverse quaternary structure is introduced, wherein reverse quaternary structure, arrangement and the step (1) quaternary structure arrangement phase
Instead, be "-++-"；With a positive quadrupole and a reverse quadrupole form most basic octupole unit "+--+- ++-", it is repeatedly more
The symmetrical coiling in octupole can be completed in the coiling of this octupole unit.
(3), using a positive octupole structure and a reversed octupole structure around producing a ten sextupole structures；
Introduce reverse octupole structure, wherein reverse octupole structure, arrangement and step (2) described in octupole Structural assignments phase
Instead, for "-++ -+--+", with a positive octupole and a reverse octupole form ten most basic sextupole units "+--+- ++ --+
+ -+--+", the symmetrical coiling of ten sextupoles can be completed in the coiling for repeating this multiple ten sextupoles unit.
(4), using a ten sextupole structure of forward direction and a reversed ten sextupoles structure around producing 30 two-level structures,
As shown in Figure 5.
Reverse ten sextupoles structure is introduced, wherein reverse ten sextupoles structure, arrangement and the step (3) ten sextupole structures
Arrangement on the contrary, for "-++ -+-- ++ --+- ++-", most basic three are formed with ten sextupole of forward direction and reverse ten sextupole
12 pole units "+--+- ++ -- ++ -+--+- ++ -+-- ++ --+- ++-", repeat the coiling of this multiple 32 pole unit
Complete 32 extremely symmetrical coilings.
Fig. 6 is the novel optical fiber ring coiling scheme schematic diagram of this intellectual achievement invention.30 two-level structure is by multiple
Infinitesimal composition with the effect of temperature error self-compensating, the infinitesimal are cross arrangement mode.The circle of two kinds of colors point in figure
Dai Biao not live apart the optical fiber of optical fiber midpoint two sides.Such is listed 32 layers of schematic diagram.From macroscopically see 32 layers by two arrange
Opposite " ten sextupoles " unit composition, the arrangement of "+,-" number two ten sextupole units of characterization below Fig. 6.More by being permitted on microcosmic
Mostly the infinitesimal with compensation function is constituted.(region that upper left side dotted line is drawn a circle to approve in figure thus infinitesimal).The arrangement side of this infinitesimal
Formula can be also adjusted according to specific asymmetric temperature field.
To verify this intellectual achievement to the inhibiting effect of optical fiber loop temperature error, discrete optical fiber loop has been refined first
The mathematical model of temperature SHUPE error.
General optical fiber loop SHUPE error variance mathematical model
When environment temperature changes, optical fiber loop can generate thermotropic nonreciprocity SHUPE effect, when light beam is to propagate
The phase delay that constant beta (z) is generated by the optical fiber of a length of L are as follows:
Wherein β0=2 π/λ0It is the propagation constant in vacuum, the refractive index that it is z away from optical fiber starting point length that n (z), which is indicated,.When
When variation of ambient temperature, the refractive index of optical fiber core material and the thermal expansion coefficient of medium can change, to influence light wave
The phase of propagation:
N is the effective refractive index of optical fiber in formula (2),Be its size of the temperature coefficient of refractive index be 1.35 × 10-5,
α is the refractive index coefficient of expansion, and △ T (z) is indicated along optical fiber and away from the Temperature Distribution variation that its starting point distance is the point at z
Amount.Because of α n ratioOne to two small order of magnitude, often ignores the influence of α n.Since SHUPE is missed in optical fibre gyro
Thermotropic nonreciprocity angular speed error caused by difference are as follows:
In formula, D is the average diameter of optical fiber loop；L is the total length of optical fiber；The local refractive index of n expression optical fiber loop；Indicate optical fiber z point in the Cooling rate of t moment；L-2z then indicates position of the z point optical fiber relative to optical fiber loop midpoint
The factor.If optical fiber loop is P layers shared, every layer of the number of turns is Q circle, therefore the optical fiber loop that length is L can be equivalent to altogether by PQ
Circle optical fiber is constituted.If the coordinate length of i-th circle optical fiber start position opposed optical fibers ring one end (setting the end A) starting point is li, i-th
The length of circle optical fiber is dli, then coordinate position of the end point of the i-th circle optical fiber away from the end optical fiber loop A is li+dli, respectively by I
The starting point coordinate of circle optical fiber substitutes into formula (3), the available thermotropic output angle rate error expression of SHUPE error for being accurate to circle
Formula:
(L-2l in above formulai-dli)dliIndicate the location factor of this circle optical fiber.It is by formula (4) it is found that each in optical fiber loop
The difference of the circle fiber position factor depends primarily on the difference of ring winding method.
Optical fiber loop finite element heat transfer model is established at the same time
Each component parameter is as shown in the table in its model.
The emulation optical fiber loop each component thermal conduction study parameter of table 1
The discrete models of optical fiber loop temperature error and physical model are combined both it can be concluded that identical
Under the conditions of temperature, the inhibitory effect of the optical fiber loops of different coiling schemes to temperature error.
Simulation result is as shown in table 2.
| Coiling scheme | The emulation of temperature error normalizes result |
| The symmetrical winding of quadrupole | 1 |
| The symmetrical winding in octupole | 50% |
| The symmetrical winding of ten sextupoles | 20% |
| Winding of the invention patent with compensation infinitesimal | 5% |
It can more effectively be mentioned using the novel winding with compensation infinitesimal of this intellectual achievement invention as can be seen from Table 2
Rise the inhibitory effect to temperature error of optical fiber loop.And the distributing order due to can arbitrarily change infinitesimal, it can be directed to
Property to asymmetric thermal field carry out optical fiber loop internal optical fiber arrangement design, optical fiber loop can be promoted to a greater extent non-right
Claim the temperature performance under the conditions of temperature field.
Claims (5)
1. a kind of multipolarization optical fibre gyro ring winding structure of winding method using multipolarization optical fibre gyro ring, feature
It is: the following steps are included:
(1), one quaternary structure of coiling；
(2), using a positive quaternary structure and a reversed quaternary structure around producing an octupole structure；
(3), using a positive octupole structure and a reversed octupole structure around producing a ten sextupole structures；
(4), using a ten sextupole structure of forward direction and a reversed ten sextupoles structure around producing 30 two-level structures；
(4) 30 two-level structures are made of step multiple infinitesimals with the effect of temperature error self-compensating, which is
Cross arrangement mode；
Including multiple basic 32 pole units, each 32 pole unit is reverse by a ten sextupole structure of forward direction and one
Ten sextupole structures constitute, Structural assignments be "+--+- ++ -- ++ -+--+- ++ -+-- ++ --+- ++-"；
Optical fiber loop is divided into multiple with self benefit of temperature error by 30 two-level structures in the way of cross arrangement
Repay the infinitesimal of effect.
2. a kind of multipolarization optical fibre gyro of winding method using multipolarization optical fibre gyro ring according to claim 1
Ring winding structure, it is characterised in that: step (1) described one quaternary structure of coiling method particularly includes: a continuous light
Fibre since its midpoint, the optical fiber of two sides be wound on respectively two it is different divide on tow wheel, divide optical fiber on tow wheel A be used for around
Each circle of first layer in ring processed, the optical fiber divided on tow wheel B are used for the second layer of coiling ring, the direction of the second layer and first layer
It is identical, after the completion of second layer coiling, still divide the optical fiber on tow wheel B using this, then coiling third layer optical fiber in opposite direction；With
Afterwards, the optical fiber divided on tow wheel A is recycled, the 4th layer of this ring of coiling, coiling direction is identical as third layer, in this way, optical fiber
The optical fiber of midpoint side is used to complete the coiling of each circle optical fiber of first layer and the 4th layer, and the optical fiber of the other side is for completing
Two, 3 two layers of coilings, the four of coiling layer optical fiber is referred to as one " quadrupole " in this manner, if distinguishing table with "+" and "-"
Show the optical fiber of optical fiber midpoint two sides, then the structure of this quadrupole is "+--+", and the symmetrical winding of quadrupole is using this quadrupole unit as base
Plinth repeats the coiling of multiple quadrupoles.
3. a kind of multipolarization optical fibre gyro of winding method using multipolarization optical fibre gyro ring according to claim 1
Ring winding structure, it is characterised in that: step (2) described one octupole structure of coiling method particularly includes: introduce reverse quadrupole
Structure, wherein reverse quaternary structure, arrangement and step (1) the quaternary structure arrangement on the contrary, for "-++-"；Just with one
To quadrupole and a reverse quadrupole form most basic octupole unit "+--+- ++-", the coiling for repeating multiple this octupole unit is
The achievable symmetrical coiling in octupole.
4. a kind of multipolarization optical fibre gyro of winding method using multipolarization optical fibre gyro ring according to claim 1
Ring winding structure, it is characterised in that: step (3) described one ten sextupole structure of coiling method particularly includes: introduce reverse eight
Pole structure, wherein reverse octupole structure, arrangement and step (2) the octupole Structural assignments on the contrary, for "-++ -+--+", with
One positive octupole and a reverse octupole form ten most basic sextupole units "+--+- ++ -- ++ -+--+", repeatedly it is multiple this
The symmetrical coiling of ten sextupoles can be completed in the coiling of ten sextupole units.
5. a kind of multipolarization optical fibre gyro of winding method using multipolarization optical fibre gyro ring according to claim 1
Ring winding structure, it is characterised in that: step (4) described one 30 two-level structure of coiling method particularly includes: introduce reverse
Ten sextupole structures, wherein reverse ten sextupoles structure, arrangement and step (3) the ten sextupole Structural assignments on the contrary, for "-++-
+ -- ++ --+- ++-", with ten sextupole of forward direction and reverse ten sextupole form 32 most basic pole units "+--+-+
+ -- ++ -+--+- ++ -+-- ++ --+- ++-", the coiling for repeating this multiple 32 pole unit can be completed 32 extremely symmetrically
Coiling.
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| CN107860380A (en) * | 2017-10-30 | 2018-03-30 | 中国电子科技集团公司第四十六研究所 | A kind of high-precision polarization maintaining optical fibre ring winding method |
| CN108168576A (en) * | 2017-12-15 | 2018-06-15 | 中国船舶重工集团公司第七0七研究所 | One kind is used for the symmetrical coiling method of optical fibre gyro ring tail optical fiber |
| CN110160556B (en) * | 2019-05-17 | 2023-01-24 | 中北大学 | Framework and symmetrical cross winding method of fiber-optic gyroscope sensitive coil ring |
| CN111220140B (en) * | 2020-02-17 | 2022-04-05 | 北京航空航天大学 | Cross sixteen-pole symmetric looping method for ultrahigh-precision fiber-optic gyroscope |
| CN112504259B (en) * | 2020-12-18 | 2022-07-01 | 重庆华渝电气集团有限公司 | Optical fiber ring winding method with bidirectional temperature inhibition effect |
| CN117383820B (en) * | 2023-10-25 | 2024-09-13 | 重庆微敏科技有限公司 | Method, device and medium for winding frameless optical fiber |
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| US5475774A (en) * | 1991-11-25 | 1995-12-12 | Honeywell Inc. | Optical fiber sensor coil using reverse quadrupoles and method of winding same |
| CN101221047A (en) * | 2008-01-25 | 2008-07-16 | 浙江大学 | Optical fiber sensor coil winding method implementing depolarization |
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|---|---|---|---|---|
| US5475774A (en) * | 1991-11-25 | 1995-12-12 | Honeywell Inc. | Optical fiber sensor coil using reverse quadrupoles and method of winding same |
| CN101221047A (en) * | 2008-01-25 | 2008-07-16 | 浙江大学 | Optical fiber sensor coil winding method implementing depolarization |
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| 光纤陀螺温度误差及其抑制方法研究;王玥泽;《中国优秀硕士学位论文全文数据库 工程科技Ⅱ辑》;20130515(第5期);正文第34-44页 * |
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