CN102809577A - Device and method for measuring radar reflection characteristic of plasma coating material - Google Patents
Device and method for measuring radar reflection characteristic of plasma coating material Download PDFInfo
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- CN102809577A CN102809577A CN2012102571427A CN201210257142A CN102809577A CN 102809577 A CN102809577 A CN 102809577A CN 2012102571427 A CN2012102571427 A CN 2012102571427A CN 201210257142 A CN201210257142 A CN 201210257142A CN 102809577 A CN102809577 A CN 102809577A
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Abstract
The invention discloses a device and a method for measuring the radar reflection characteristic of a plasma coating material. The device comprises a large-area uniform unmagnetized plasma generation unit, a radar cross section measurement mechanism, a microwave unreflected chamber, a supporting guide rail, a supporting sliding block, a measured material plate and a wave-absorbing material, wherein the large-area uniform unmagnetized plasma generation unit and the radar cross section measurement mechanism are fixed in the microwave unreflected chamber; the large-area uniform unmagnetized plasma generation unit is surrounded in a space by the wave-absorbing material; and the wave-absorbing material is provided with a window, so that the measured material plate of the large-area uniform unmagnetized plasma generation unit directly faces the radar cross section measurement mechanism. By the device and the method, plasma can be coated on the surface of a measured material, and the adjustment of the thickness of the plasma and the weakening of the radar echo reflection of a body are further realized, so that the development of the experimental measurement of the radar reflection characteristic of the plasma coating material is met.
Description
Technical field
The invention belongs to microwave/The radar exploration technique field, relate to a kind of radar reflect property measurement mechanism and method of plasma clad material, can be used for measured material is evenly coated plasma, and its radar reflect property is measured.
Background technology
Plasma has unique absorption, reflection, scattering properties as a kind of special dispersive medium to electromagnetic wave, and is huge with various conventional material differences.The process that targets such as common all kinds of spacecraft, bullet reenter atmosphere at a high speed can produce plasma self is coated because of friction high temperature; Its surface equivalence is the isoionic compound substance of a kind of covering, thereby changes the radar reflect property (normally weakening radar return) of target itself.Therefore, article on plasma coats material down, the research of target property, in recoverable spacecraft observing and controlling, to reenter fields such as target detection, missile warning defence and interception, aircraft be stealthy all be to study focus.
Target property uses RCS (RCS) to characterize usually.For the target of routine, obtaining the RCS parameter has two kinds of approach: the one, and experimental method places whole target (or scale model) in the microwave dark room, directly obtains the RCS parameter thereby measure its each azimuthal radar echo intensity; The 2nd, numerical algorithm under the prerequisite of the radar reflect property of the material of prior known target and every kind of material, obtains the RCS of whole object through Electromagnetic Calculation.
For the target that plasma coats, the difficult point that obtains RCS is to be coated with the character of surface of plasma.Because at the plasma of the true Flow Field Distribution of full-scale target surface integral coating and carry out rcs measurement and still can not realize under the technical conditions at present, if utilize scale model to experimentize and can be difficult to the anti-full scale model that is pushed into because of the nonlinear effect of dispersion of plasma.So; Feasible approach is to carry out the part experiment earlier at present; Promptly evenly cover the plasma of different-thickness, different densities at the various surfacings of target; The radar reflect property of all types of target surfacing under measurement is covered by plasma carries out Target Modeling and plasma jet field distribution modeling again, and the means of calculating through electromagnetism at last obtain the RCS of whole object.
Therefore, measuring all types of target surfacing at the radar reflect property that is coated with different-thickness and density plasma, is the crucial prerequisite that calculating plasma coats target RCS.The method that can produce the plasma that is coated on target or material surface at present mainly is divided into two big types:
The first kind is based on the high speed pneumatic principle and produces plasma, is representative with ballistic range and shock tube.Wherein ballistic range can accelerate to reentry velocity with small-sized bullet, with free air friction generates plasma bullet is coated; The shock tube internal object is fixed, and the shock wave driving that test gas is exploded and produces is tried target with the reentry velocity bump.This class methods produce the Physical Mechanism of plasma with truly reentry body is identical, extremely lack (hundred microsecond levels) and be difficult to carry out experiment but shortcoming is a test period, and blast, high velocity air have destructiveness, are difficult to place all kinds of microwave test equipment at experimental section.
Second type is ionic plasma, is representative with plasma stealth technology and plasma jet flow technology.Its ionic medium stealth technology utilization intersection is inserted and is referred to that electrode is covered in material surface; Utilize glow discharge that plasma is covered in material or target surface; This technology is inapplicable in this area, because the metal electrode that the surface spreads all over has changed raw-material character of surface; Means ionized gases such as plasma jet flow techniques make use microwave, electric arc produce plasma; Utilize again high pressure draught with plasma jet in material surface; Be usually used in the material ablation test, its high temperature of following has destructiveness, and is difficult to obtain even, stable thickness and density.
To sum up, present existing plasma produces means still can not satisfy material radar reflect property measurement demand fully, and the plasma that satisfies the demands produces equipment should possess following characteristic:
1) plasma large tracts of land, even can be covered in material surface;
2) long-time continuing;
3) to not had destructiveness by examination material, experimental facilities;
4) density, thickness can be regulated continuously;
5) generation device itself is to little by the added influence of examination material radar characteristic;
Patent " even unmagnetized plasma generation device of large tracts of land and method " (publication number: 102361531A) disclose and a kind ofly utilize the glow discharge of ring network electrode as plasma source; And under the effect of low-pressure gas diffusional effect; Obtain unmagnetized, hollow, large tracts of land evenly, controllable density, nondestructive plasma generation device, be used for the Propagation Characteristics of electromagnetic wave in gas ions; The type device solves plasma continue and large tracts of land even two big crucial difficult point problems for a long time, thereby can satisfy the demand of above-mentioned part, but, also have following 3 weak points if be applied to plasma clad material ELECTROMAGNETIC REFLECTION feature measurement:
1) plasma can't be covered in the measured material surface.The plasma that the type device is produced is positioned at vacuum cavity inside, and front and back stop has quartzy view window, and plasma coated that can't it is inner is in material surface.
2) plasma thickness is unadjustable.Plasma is under the infrabar diffusion in such device, and evenly whole cavity is filled in diffusion, and plasma thickness can not be regulated arbitrarily by the intrinsic size decision of cavity.
3) device itself is strong radar reflection source.The cavity metal material of such device constitutes, and itself is the reflected radar echo consumingly, floods the radar return of material.
Summary of the invention
The purpose of this invention is to provide and a kind ofly can coat plasma on measured material surface; And realize that further plasma thickness radar return adjustable and the weakening body reflects, thereby satisfy the radar reflect property measurement mechanism and the method for the plasma clad material of the radar reflect property experiment measuring of carrying out the plasma clad material.
For realizing above-mentioned purpose; The objective of the invention is to realize like this; The radar reflect property measurement mechanism of plasma clad material; It is characterized in that: comprising: large tracts of land is spared unmagnetized plasma generation unit, RCS measuring mechanism, microwave dark room, supporting guide, support slipper, measured material plate, absorbing material; The even unmagnetized plasma generation unit of large tracts of land, RCS measuring mechanism are fixed in the microwave dark room; The even unmagnetized plasma generation unit of large tracts of land is enclosed in the space by absorbing material, and absorbing material has a window, makes the measured material plate of the even unmagnetized plasma generation unit of large tracts of land face the RCS measuring mechanism directly.
Described measured material plate is fixed in the cavity of the even unmagnetized plasma generation unit of large tracts of land by supporting guide, back-up block; The even unmagnetized plasma generation unit of large tracts of land portion within it produces the large tracts of land homogeneous plasma, and the even unmagnetized plasma generation unit of large tracts of land measured material plate is divided into two parts; Absciss layer that waits of incident wave direction is worked to electromagnetic wave.
Described support slipper is processed by the tetrafluoroethene material; The groove of thickness 6mm is arranged at top; Sandwich the measured material plate of a slice thickness 5-6mm, and fixed by clamping screw, the dovetail tangs of bottom cooperates with the dovetail groove of supporting guide; Insert in the dovetail groove of supporting guide, the position of measured material plate can be regulated front and back in the even unmagnetized plasma generation unit of large tracts of land.
Described absorbing material is inhaled the ripple plate for the pyramid type foam.
Said supporting guide is processed by polytetrafluoroethylmaterial material, long 18cm, and wide 3cm, high 2cm, the dark dovetail groove of 1cm is carved with on top, and the bottom is installed on the inside of the mesh electrode in the even unmagnetized plasma generation unit of large tracts of land with screw, and a slide rail is provided.
Compare existing similar techniques, the present invention has following beneficial effect:
1. the measured material among the present invention is immersed in uniform large-area plasma inside fully, has realized the homogeneous plasma on measured material surface is coated.
2. the present invention has adopted guide rail and slide block structure, makes the measured material plate removable in plasma, under the constant prerequisite of plasma general thickness, has realized the adjusting of measured material incident wave surface plasma thickness.
3. the present invention has adopted absorbing material to eliminate the reflection wave of plasma apparatus itself, makes the radar return feature measurement of plasma clad material more accurate.
Description of drawings
Below in conjunction with the embodiment accompanying drawing the present invention is described further:
Fig. 1 is the radar scattering characteristic measuring system example structure figure of plasma clad material of the present invention;
Fig. 2 is in the radar scattering characteristic measuring system of plasma clad material of the present invention, the detail view of supporting guide and support slipper;
Fig. 3 is that method flow diagram is surveyed in the radar scattering characteristic test of plasma clad material of the present invention.
Among the figure, 1, the even unmagnetized plasma generation unit of large tracts of land; 2, RCS measuring mechanism; 3, microwave dark room; 4, supporting guide; 5, support slipper; 6, measured material plate; 7, mesh electrode; 8, absorbing material; 51, clamping screw.
Embodiment
Embodiment 1
The radar reflect property measurement mechanism of plasma clad material; Comprise: large tracts of land is spared unmagnetized plasma generation unit 1, RCS measuring mechanism 2, microwave dark room 3, supporting guide 4, support slipper 5, measured material plate 6, absorbing material 8; The even unmagnetized plasma generation unit of large tracts of land 1, RCS measuring mechanism 2 are fixed in the microwave dark room 3; The even unmagnetized plasma generation unit 1 of large tracts of land is enclosed in the space by absorbing material 8; Absorbing material 8 has a window, makes the measured material plate 6 of the even unmagnetized plasma generation unit 1 of large tracts of land face RCS measuring mechanism 2 directly.
Embodiment 2
With reference to Fig. 1; The radar reflect property measurement mechanism of plasma clad material; Comprise: large tracts of land is spared unmagnetized plasma generation unit 1, RCS measuring mechanism 2, microwave dark room 3, supporting guide 4, support slipper 5, measured material plate 6, absorbing material 8; The even unmagnetized plasma generation unit of large tracts of land 1, RCS measuring mechanism 2 are fixed in the microwave dark room 3; The even unmagnetized plasma generation unit 1 of large tracts of land is enclosed in the space by absorbing material 8; Absorbing material 8 has a window, makes the measured material plate 6 of the even unmagnetized plasma generation unit 1 of large tracts of land face RCS measuring mechanism 2 directly, and measured material plate 6 is fixed in the cavity of the even unmagnetized plasma generation unit 1 of large tracts of land by supporting guide 4, back-up block 5; The even unmagnetized plasma generation unit 1 of large tracts of land portion within it produces the large tracts of land homogeneous plasma, and the even unmagnetized plasma generation unit 1 measured material plate 6 of large tracts of land is divided into two parts; Wherein only there is absciss layer that waits of incident wave direction that electromagnetic wave is worked, realized evenly covering certain thickness plasmasphere, and the thickness of plasmasphere can preestablishes through moving support slipper 5 in the place ahead of plate of material.The electromagnetic wave that RCS measuring mechanism 2 sends is injected and is coated with isoionic measured material plate 6, and measures its reflection echo intensity, draws its radar return characteristic.The even unmagnetized plasma generation unit 1 of large tracts of land adopts patent " even unmagnetized plasma generation device of large tracts of land and method " (publication number: 102361531A) the even unmagnetized plasma generation device of disclosed large tracts of land.RCS measuring mechanism 2 is the RCS surveying instrument, belongs to parts known in this field.
As shown in Figure 2; Support slipper 5 is processed by the tetrafluoroethene material, and the groove of thickness 6mm is arranged at top, sandwiches the measured material plate 6 of a slice thickness 5-6mm; And it is fixing by clamping screw 51; The dovetail tangs of bottom cooperates with the dovetail groove of supporting guide 4, inserts in the dovetail groove of supporting guide 4, and the position of measured material plate 6 can be regulated front and back in the even unmagnetized plasma generation unit 1 of large tracts of land; Metal surface and electric wave transmission plane attach foam pyramid absorbing material 8, prevent that radio wave attenuation from disturbing.
As shown in Figure 3, supporting guide 4 is processed long 18cm by polytetrafluoroethylmaterial material; Wide 3cm, high 2cm, the dark dovetail groove of 1cm is carved with on top; The bottom is installed on the inside of the mesh electrode 7 in the even unmagnetized plasma generation unit 1 of large tracts of land with screw, and a slide rail is provided.
Absorbing material is inhaled the ripple plate for the pyramid type foam, is attached at all metal surfaces of device and electric wave transmission plane equably, realizes the radar return absorption of metal parts and the absorption of transmitted wave are prevented secondary reflection.
Principle of work of the present invention is: the measured material plate of installing on the supported guide rail of the even unmagnetized plasma of large tracts of land 4, the support slipper 56 is divided into two parts; Wherein only there is absciss layer that waits of incident wave direction that electromagnetic wave is worked, realized evenly covering certain thickness plasmasphere, and the thickness of plasmasphere can be regulated through moving support slipper 5 shift positions in the place ahead of plate of material.The electromagnetic wave that RCS measuring mechanism 2 sends is injected and is coated with isoionic measured material plate 6, and measures its reflection echo intensity, draws its radar return characteristic.
With reference to Fig. 3, embodiment of the invention measuring method comprises the steps:
(1) removes the measured material plate of installing on supported guide rail 4, the support slipper 56, with the even unmagnetized plasma background reflection of RCS measuring mechanism measurement large tracts of land intensity;
(2) at support slipper 5 measured material plate 6 is installed, is regulated the distance of incident wave to measured material plate 6;
(3) open plasma source, be adjusted to required electron density;
(4) be coated with the reflection strength behind the plasma with the measurement of RCS measuring mechanism;
(5) the background reflection intensity that records in reflection strength that records in the step (4) and the step (1) is subtracted each other, draw the radar reflect property of plasma clad material.
Parts that present embodiment is not described in detail and structure belong to well-known components and the common structure or the conventional means of the industry, here not narration one by one.
Claims (6)
1. the radar reflect property measurement mechanism of plasma clad material; It is characterized in that: comprising: large tracts of land is spared unmagnetized plasma generation unit (1), RCS measuring mechanism (2), microwave dark room (3), supporting guide (4), support slipper (5), measured material plate (6), absorbing material (8); The even unmagnetized plasma generation unit of large tracts of land (1), RCS measuring mechanism (2) are fixed in the microwave dark room (3); The even unmagnetized plasma generation unit of large tracts of land (1) is enclosed in the space by absorbing material (8); Absorbing material (8) has a window, makes the measured material plate (6) of the even unmagnetized plasma generation unit of large tracts of land (1) face RCS measuring mechanism (2) directly.
2. the radar reflect property measurement mechanism of plasma clad material according to claim 1; It is characterized in that: described measured material plate (6) is fixed in the cavity of the even unmagnetized plasma generation unit of large tracts of land (1) by supporting guide (4), back-up block (5); The even unmagnetized plasma generation unit of large tracts of land (1) portion within it produces the large tracts of land homogeneous plasma, and the even unmagnetized plasma generation unit of large tracts of land (1) measured material plate (6) is divided into two parts; Absciss layer that waits of incident wave direction is worked to electromagnetic wave.
3. the radar reflect property measurement mechanism of plasma clad material according to claim 1; It is characterized in that: described support slipper (5) is processed by the tetrafluoroethene material; The groove of thickness 6mm is arranged at top; Sandwich the measured material plate (6) of a slice thickness 5-6mm, and fixing by clamping screw (51), and the dovetail tangs of bottom cooperates with the dovetail groove of supporting guide (4); Insert in the dovetail groove of supporting guide (4), the position of measured material plate (6) can be regulated front and back in the even unmagnetized plasma generation unit of large tracts of land (1).
4. the radar reflect property measurement mechanism of plasma clad material according to claim 1 is characterized in that: described absorbing material (8) is inhaled the ripple plate for the pyramid type foam.
5. the radar reflect property measurement mechanism of plasma clad material according to claim 1; It is characterized in that: described supporting guide (4) is processed by polytetrafluoroethylmaterial material, long 18cm, wide 3cm; High 2cm; The dark dovetail groove of 1cm is carved with on top, and the bottom is installed on the inside of the mesh electrode (7) in the even unmagnetized plasma generation unit of large tracts of land (1) with screw, and a slide rail is provided.
6. the radar reflect property measuring method of plasma clad material is characterized in that: comprise following method:
(1) removes the upward measured material plate (6) of installation of supported guide rail (4), support slipper (5), measure the even unmagnetized plasma background reflection of large tracts of land intensity with the RCS measuring mechanism;
(2) at support slipper (5) measured material plate (6) is installed, is regulated the distance of incident wave to measured material plate (6);
(3) open plasma source, be adjusted to required electron density;
(4) be coated with the reflection strength behind the plasma with the measurement of RCS measuring mechanism;
(5) the background reflection intensity that records in reflection strength that records in the step (4) and the step (1) is subtracted each other, draw the radar reflect property of plasma clad material.
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106249213A (en) * | 2016-10-11 | 2016-12-21 | 中国民航大学 | A kind of indoor barrier reflection removal system for radar experiment porch |
| CN106950433A (en) * | 2017-02-24 | 2017-07-14 | 北京航天长征飞行器研究所 | A kind of low electromagnetic scattering background environment implementation method for adapting to condition of high vacuum degree |
| CN107995765A (en) * | 2017-10-19 | 2018-05-04 | 上海无线电设备研究所 | A kind of plasma chamber testing background removing method |
| CN108037173A (en) * | 2017-12-06 | 2018-05-15 | 上海无线电设备研究所 | A kind of test system and method for hypersonic two dimension plasma sheath |
| CN108614251A (en) * | 2016-12-11 | 2018-10-02 | 南京理工大学 | The radar cross section Visual calculation method of computing of multi-coated targets with RAM |
| CN109661094A (en) * | 2018-12-19 | 2019-04-19 | 中国人民解放军空军工程大学 | A kind of microwave interference diagnosis based on fluid model |
| CN110398721A (en) * | 2018-04-25 | 2019-11-01 | 成都飞机工业（集团）有限责任公司 | A kind of radar absorbing blocks screen shaping method |
| CN111638569A (en) * | 2020-07-17 | 2020-09-08 | 中国人民解放军空军工程大学 | Radio frequency inductive coupling plasma superposition phase gradient super-surface wave-absorbing structure |
| CN111766453A (en) * | 2020-06-12 | 2020-10-13 | 中国航发北京航空材料研究院 | Radar scattering cross section test system and method of heating element |
| CN111999713A (en) * | 2020-08-20 | 2020-11-27 | 北京环境特性研究所 | Pit, RCS microwave camera comprising pit and method for replacing support in camera |
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| CN106249213A (en) * | 2016-10-11 | 2016-12-21 | 中国民航大学 | A kind of indoor barrier reflection removal system for radar experiment porch |
| CN108614251A (en) * | 2016-12-11 | 2018-10-02 | 南京理工大学 | The radar cross section Visual calculation method of computing of multi-coated targets with RAM |
| CN106950433B (en) * | 2017-02-24 | 2019-05-24 | 北京航天长征飞行器研究所 | A kind of low electromagnetic scattering background environment implementation method adapting to condition of high vacuum degree |
| CN106950433A (en) * | 2017-02-24 | 2017-07-14 | 北京航天长征飞行器研究所 | A kind of low electromagnetic scattering background environment implementation method for adapting to condition of high vacuum degree |
| CN107995765A (en) * | 2017-10-19 | 2018-05-04 | 上海无线电设备研究所 | A kind of plasma chamber testing background removing method |
| CN108037173A (en) * | 2017-12-06 | 2018-05-15 | 上海无线电设备研究所 | A kind of test system and method for hypersonic two dimension plasma sheath |
| CN110398721A (en) * | 2018-04-25 | 2019-11-01 | 成都飞机工业（集团）有限责任公司 | A kind of radar absorbing blocks screen shaping method |
| CN109661094A (en) * | 2018-12-19 | 2019-04-19 | 中国人民解放军空军工程大学 | A kind of microwave interference diagnosis based on fluid model |
| CN111766453A (en) * | 2020-06-12 | 2020-10-13 | 中国航发北京航空材料研究院 | Radar scattering cross section test system and method of heating element |
| CN111766453B (en) * | 2020-06-12 | 2023-03-14 | 中国航发北京航空材料研究院 | Radar scattering cross section test system and method of heating element |
| CN111638569A (en) * | 2020-07-17 | 2020-09-08 | 中国人民解放军空军工程大学 | Radio frequency inductive coupling plasma superposition phase gradient super-surface wave-absorbing structure |
| CN111999713A (en) * | 2020-08-20 | 2020-11-27 | 北京环境特性研究所 | Pit, RCS microwave camera comprising pit and method for replacing support in camera |
| CN111999713B (en) * | 2020-08-20 | 2023-06-09 | 北京环境特性研究所 | Pit, RCS microwave darkroom comprising pit and method for replacing bracket in darkroom |
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