CN203465355U - Resonant cavity test device for material dielectric constant test - Google Patents
Resonant cavity test device for material dielectric constant test Download PDFInfo
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- CN203465355U CN203465355U CN201320594415.7U CN201320594415U CN203465355U CN 203465355 U CN203465355 U CN 203465355U CN 201320594415 U CN201320594415 U CN 201320594415U CN 203465355 U CN203465355 U CN 203465355U
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Abstract
The utility model discloses a resonant cavity test device for material dielectric constant test, which comprises a resonant cavity made of oxide ceramics or nitride ceramics. A piston made of oxide ceramics or nitride ceramics is arranged at the cavity tube opening of the resonant cavity; a coupling hole is opened in the side wall of the resonant cavity; a waveguide tube made of oxide ceramics or nitride ceramics is corresponding to the coupling hole and is connected with the resonant cavity; and the inner wall of the cavity tube of the resonant cavity, the inner wall of the waveguide tube and the surface of the piston are all coated with conductive metal layers. According to the resonant cavity test device for material dielectric constant test, the structure is simple, high-temperature dielectric constant test can be carried out in air atmosphere, the actual use condition of the material can be reflected, errors of the test result can be avoided, and the test device can be greatly simplified; and as the consumption of noble metal is little, the cost of the device is greatly reduced.
Description
Technical field
The utility model relates to material dielectric constant technical field of measurement and test, especially, relates to a kind of resonator cavity proving installation for material dielectric constant test.
Background technology
Dielectric material microwave electromagnetic parameter measurement at high temperature seems extremely important in some cases, when selecting the head radar antenna cover material of high-speed aircraft.High-speed aircraft is due to Aerodynamic Heating, head antenna house can reach very high temperature (often over 1000 ℃), guarantee that antenna house has enough microwave transmissions, must obtain in advance various materials electromagnetic parameter at high temperature, thereby select correct material to build antenna house.
The method of test material complex permittivity mainly contains transmission reflectometry resonant cavity method.Transmission reflectometry incides reflection, the transmission coefficient after material surface by test microwave, then solves complex permittivity and magnetic permeability.Resonant-cavity Method is that sample is put into resonator cavity, solves complex permittivity and the magnetic permeability of material according to the variation of putting into sample front and back resonance frequency and quality factor.Resonant-cavity Method is particularly suitable for the electromagnetic parameter testing of low-loss material, has very high measuring accuracy, and low-loss material is widely used in radome.
Document " < < aerospace material technique > > Aerospace Material & Technology Inst. sponsors; the 2nd phase in 2011, the electromagnetic wave transparent material high temperature dielectric properties evaluation of being delivered by Chen Conghui, He Fengmei, Li En and Li Qi characterizes ".In document, describe the present Research of electromagnetic wave transparent material high-temperature dielectric constant test in detail: the 70-80 age in 20th century, the NASA LRC (Langley Research Center) of the U.S. has tested the specific inductive capacity at 1200 ℃ of wave transparent window candidate materials, adopted terminal short circuit, rectangular waveguide is as microwave transmission line, bibliographical information select platinum-rhodium alloy (1800 ℃ of maximum operation (service) temperatures) to make microwave device, but do not carry out test error analysis.Britain adopts graphite (3650 ℃ of sublimation temperatures) to make rectangular waveguide and has tested 7.5GHz-40GHz frequency range material from the complex permittivity of room temperature to 2000 ℃.Canada R.M.Hutcheon adopts cylinder resonator to carry out testing research to material room temperature to 1500 ℃ specific inductive capacity.Russia adopts high Q resonant cavity to set up X-band material dielectric constant test macro in the eighties in 20th century, and probe temperature can reach 1200 ℃.The enforcement period of the ninth five-year plan, domestic Aerospace Material & Technology Inst. combines with University of Electronic Science and Technology and has carried out 2GHz-18GHz, room temperature to 1200 ℃ low-loss material resonator cavity measuring technology and systematic research.
Critical piece in high temperature microwave proving installation is high temperature resistant microwave device, and these devices comprise waveguide, resonator cavity etc., and from prior art, the material of preparing high temperature resistant microwave device mainly contains graphite, platinum-rhodium alloy etc.But adopt the high temperature resistant microwave device of graphite, platinum-rhodium alloy manufacture to there is following deficiency:
1, the high temperature resistant microwave device of graphite manufacture can not carry out the test of high-temperature dielectric constant under oxidizing atmosphere, need under the environment of vacuum state or inert gas shielding, carry out the test of high-temperature dielectric constant, causes that proving installation is complicated, cost is high.
2, the high temperature resistant microwave device of graphite manufacture can not carry out the test of high-temperature dielectric constant in air, can not the real service condition of reaction material.
3, the high temperature resistant microwave device that graphite is manufactured can produce distillation in high-temperature atmosphere, and Contamination measurement sample, causes test result to occur error.
4, use platinum-rhodium alloy to manufacture high temperature resistant microwave device, the use amount of platinum-rhodium alloy is many, causes equipment cost expensive.
For this phenomenon, the patent No. is that 200710050347.7 Chinese patent discloses " a kind of cylindrical high Q resonant cavity for microwave test under high temperature ", prior art has been made to improvement, the cavity that adopts the resistant to elevated temperatures precious metal material of thin layer to make cylindrical high Q resonant cavity is disclosed in patent, and adopt exotic material to support noble metal cavity, propping material adopts graphite, and noble metal adopts platinum-rhodium alloy.This kind of structure, is used graphite as propping material, and resonator cavity adopts platinum-rhodium alloy, have certain reduction, but the platinum-rhodium alloy consumption of resonator cavity is still larger for cost; Meanwhile, the problem that graphite material can not be used in oxidizing atmosphere is not resolved yet.
Utility model content
The utility model object is to provide a kind of resonator cavity proving installation for material dielectric constant test, to solve the high temperature resistant microwave device of graphite manufacture in prior art, can not under oxidizing atmosphere, carry out the test of high-temperature dielectric constant, cause test result to occur error; Platinum-rhodium alloy is manufactured the technical matters of high temperature resistant microwave device cost costliness.
For achieving the above object, according to an aspect of the present utility model, a kind of resonator cavity proving installation for material dielectric constant test is provided, comprise: the resonator cavity that oxide ceramics or nitride ceramics are made, the chamber cylinder opening part of resonator cavity is provided with the piston that oxide ceramics or nitride ceramics are made, sidewall at resonator cavity offers coupling aperture, and the corresponding coupling aperture of waveguide that oxide ceramics or nitride ceramics are made is connected with resonator cavity; On the chamber of resonator cavity cylinder inwall, the inwall of waveguide and the surface of piston, be all coated with conductive metal layer.
Further, resonator cavity is that aluminium oxide, zirconia, silicon dioxide, mullite or silicon nitride ceramic material are made.
Further, piston is that aluminium oxide, zirconia, silicon dioxide, mullite or silicon nitride ceramic material are made.
Further, waveguide is that aluminium oxide, zirconia, silicon dioxide, mullite or silicon nitride ceramic material are made.
Further, chamber cylinder inwall, the inwall of waveguide and the conductive metal layer of piston face of resonator cavity are the conductive metal layer of platinum, iridium or platinum-rhodium alloy.
Further, the thickness of conductive metal layer is greater than 1 μ m, and surface resistance is less than 0.1 ohm.
Further, be provided with threaded hole on resonator cavity, the screw that waveguide adopts oxide ceramics or nitride ceramics to make is connected with resonator cavity.
Further, screw is that aluminium oxide, zirconia, silicon dioxide, mullite or silicon nitride ceramic material are made.
The utlity model has following beneficial effect:
Resonator cavity, piston and waveguide adopt oxide ceramics or nitride ceramics, can in air atmosphere, carry out the test of high-temperature dielectric constant, do not need vacuum or inert gas shielding, test condition and behaviour in service approach, the real service condition of energy reaction material, and greatly simplify proving installation; Meanwhile, can in high-temperature atmosphere, can not produce distillation yet, thereby avoid test result to occur error; Resonator cavity proving installation only all covers conductive metal layer on the chamber of resonator cavity cylinder inwall, the inwall of waveguide and the surface of piston, and the consumption of noble metal is very few, greatly reduces equipment cost.
Except object described above, feature and advantage, the utility model also has other object, feature and advantage.Below with reference to figure, the utility model is described in further detail.
Accompanying drawing explanation
The accompanying drawing that forms the application's a part is used to provide further understanding of the present utility model, and schematic description and description of the present utility model is used for explaining the utility model, does not form improper restriction of the present utility model.In the accompanying drawings:
Fig. 1 is the structural representation of a kind of resonator cavity proving installation preferred embodiment for material dielectric constant test of the utility model;
Fig. 2 is the cross-sectional view of a kind of resonator cavity proving installation preferred embodiment for material dielectric constant test of the utility model; And
Fig. 3 is the enlarged diagram of a kind of resonator cavity proving installation preferred embodiment resonator cavity for material dielectric constant test of the utility model.
Description of reference numerals:
1, resonator cavity; 2, waveguide; 3, piston; 4, coupling aperture; 5, threaded hole; 6, chamber cylinder.
Embodiment
Below in conjunction with accompanying drawing, embodiment of the present utility model is elaborated, but the multitude of different ways that the utility model can be defined by the claims and cover is implemented.
Refer to Fig. 1 to Fig. 3, preferred embodiment of the present utility model provides a kind of resonator cavity proving installation for material dielectric constant test, comprise: the resonator cavity 1 that oxide ceramics or nitride ceramics are made, chamber cylinder 6 opening parts of resonator cavity 1 are provided with the piston 3 that oxide ceramics or nitride ceramics are made, sidewall at resonator cavity 1 offers coupling aperture 4, and the corresponding coupling aperture 4 of waveguide 2 that oxide ceramics or nitride ceramics are made is connected with resonator cavity 1; On the chamber of resonator cavity 1 cylinder 6 inwalls, the inwall of waveguide 2 and the surface of piston 3, be all coated with conductive metal layer.
While using above-mentioned resonator cavity proving installation, resonator cavity 1 is put into high temperature furnace, stretch out through the square hole of furnace wall respectively the end of two waveguides 2, external part is connected with testing tool (as vector network analyzer), sample is placed on piston 3, and with piston 3, is pushed in the chamber cylinder 6 of resonator cavity 1.When high temperature furnace heats resonator cavity 1, when the temperature in chamber cylinder 6 and the temperature in high temperature furnace reach balance, sample is carried out the test of specific inductive capacity.During test, microwave signal enters in the chamber cylinder 6 of resonator cavity 1 by a waveguide 2 wherein, and with sample effect, then test signal enters testing tool through another root waveguide 2.
Resonator cavity proving installation described in the utility model preferred embodiment, simple in structure, and resonator cavity 1, piston 3 all adopt oxide ceramics or nitride ceramics with waveguide 2, and oxide ceramics or nitride ceramics have high temperature resistant, the feature of stable in properties in oxidizing atmosphere; Resonator cavity proving installation described in the utility model preferred embodiment is compared with traditional high temperature resistant microwave device of graphite, resonator cavity proving installation described in the utility model preferred embodiment can carry out the test of high-temperature dielectric constant in air atmosphere, do not need vacuum or inert gas shielding, test condition and behaviour in service approach, the real service condition of energy reaction material, and greatly simplify proving installation; Meanwhile, can in high-temperature atmosphere, can not produce distillation yet, thereby avoid test result to occur error.Resonator cavity proving installation described in the utility model preferred embodiment is compared with traditional high temperature resistant microwave device of platinum-rhodium alloy, resonator cavity proving installation described in the utility model preferred embodiment only all covers conductive metal layer on the chamber of resonator cavity 1 cylinder 6 inwalls, the inwall of waveguide 2 and the surface of piston 3, the consumption of noble metal is very few, greatly reduces equipment cost.
Preferably, for making resonator cavity proving installation have good high-temperature resistant result, resonator cavity 1, piston 3 all adopt the stupalith of aluminium oxide, zirconia, silicon dioxide, mullite or silicon nitride to make with waveguide 2.Content is 99.9% aluminium oxide, and its sintering temperature is 1650-1990 ℃; Pure zirconic fusing point is up to 2715 ℃; The fusing point of silicon dioxide is up to 1650 ± 75 ℃; The refractoriness of mullite is up to 1800 ℃; Silicon nitride, in the time of 1900 ℃, just can decompose; Therefore, resonator cavity 1, piston 3 and waveguide 2 adopt the stupalith of aluminium oxide, zirconia, silicon dioxide, mullite or silicon nitride, can make resonator cavity proving installation have good high-temperature resistant result.
Preferably, for guaranteeing that resonator cavity proving installation has good measuring accuracy, the conductive metal layer on chamber cylinder 6 inwalls of resonator cavity 1, the inwall of waveguide 2 and piston 3 surfaces is the conductive metal layer of platinum, iridium or platinum-rhodium alloy.The thickness of conductive metal layer is greater than 1 μ m, and surface resistance is less than 0.1 ohm.
Preferably, for reducing the preparation difficulty of resonator cavity 1, piston 3 and waveguide 2; The piston 3 of resonator cavity 1, oxide or the nitride ceramics of oxide or nitride ceramics is all compressing by dry-pressing formed machine with the waveguide 2 of oxide or nitride ceramics.Conductive metal layer can adopt the mode that plating or electroless plating are combined with plating to generate chamber cylinder 6 inwalls, the inwall of waveguide 2 and the surface of piston 3 to resonator cavity 1.
Preferably, for further simplifying the structure of resonator cavity proving installation, be provided with threaded hole 5 on resonator cavity 1, the screw that waveguide 2 adopts oxide or nitride ceramics to make is connected with resonator cavity 1.The screw of oxide or nitride ceramics is the screw of aluminium oxide, zirconia, silicon dioxide, mullite or silicon nitride ceramic material.
As can be seen from the above description, the utility model the above embodiments have realized following technique effect:
The foregoing is only preferred embodiment of the present utility model, be not limited to the utility model; For a person skilled in the art, the utility model can have various modifications and variations.All within spirit of the present utility model and principle, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection domain of the present utility model.
Claims (8)
1. for a resonator cavity proving installation for material dielectric constant test, it is characterized in that, comprising:
The resonator cavity that oxide ceramics or nitride ceramics are made (1), chamber cylinder (6) opening part of described resonator cavity (1) is provided with the piston (3) that oxide ceramics or nitride ceramics are made, sidewall at described resonator cavity (1) offers coupling aperture (4), and the corresponding described coupling aperture of the waveguide that oxide ceramics or nitride ceramics are made (2) (4) is connected with described resonator cavity (1); Chamber cylinder (6) inwall, the inwall of described waveguide (2) and the surface of described piston (3) at described resonator cavity (1) are all coated with conductive metal layer.
2. a kind of resonator cavity proving installation for material dielectric constant test according to claim 1, is characterized in that:
Described resonator cavity (1) is that aluminium oxide, zirconia, silicon dioxide, mullite or silicon nitride ceramic material are made.
3. a kind of resonator cavity proving installation for material dielectric constant test according to claim 1, is characterized in that:
Described piston (3) is that aluminium oxide, zirconia, silicon dioxide, mullite or silicon nitride ceramic material are made.
4. a kind of resonator cavity proving installation for material dielectric constant test according to claim 1, is characterized in that:
Described waveguide (2) is that aluminium oxide, zirconia, silicon dioxide, mullite or silicon nitride ceramic material are made.
5. a kind of resonator cavity proving installation for material dielectric constant test according to claim 1, is characterized in that:
The conductive metal layer on chamber cylinder (6) inwall of described resonator cavity (1), the inwall of described waveguide (2) and described piston (3) surface is the conductive metal layer of platinum, iridium or platinum-rhodium alloy.
6. a kind of resonator cavity proving installation for material dielectric constant test according to claim 1 or 5, is characterized in that:
The thickness of described conductive metal layer is greater than 1 μ m, and surface resistance is less than 0.1 ohm.
7. a kind of resonator cavity proving installation for material dielectric constant test according to claim 1, is characterized in that:
On described resonator cavity (1), be provided with threaded hole (5), the screw that described waveguide (2) adopts oxide ceramics or nitride ceramics to make is connected with described resonator cavity (1).
8. a kind of resonator cavity proving installation for material dielectric constant test according to claim 7, is characterized in that:
Described screw is that aluminium oxide, zirconia, silicon dioxide, mullite or silicon nitride ceramic material are made.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103487666A (en) * | 2013-09-25 | 2014-01-01 | 长沙新图仪器有限公司 | Resonant cavity test device used for testing dielectric constant of materials |
| CN106680590A (en) * | 2015-11-11 | 2017-05-17 | 上海西门子线路保护系统有限公司 | Dielectric property test device |
| CN107490727A (en) * | 2017-08-17 | 2017-12-19 | 河南师范大学 | A kind of dielectric constant measurement method of composite microwave sensor and measured object |
| CN109696583A (en) * | 2019-02-26 | 2019-04-30 | 航天材料及工艺研究所 | Silicon nitride fiber sample, method for making sample and test method for dielectric properties test |
| CN109916967A (en) * | 2019-03-28 | 2019-06-21 | 中国科学院上海硅酸盐研究所 | A kind of resonant cavity test device for the test of material at high temperature dielectric properties |
| CN111257370A (en) * | 2020-03-05 | 2020-06-09 | 西北工业大学 | Device and method for measuring dielectric constant and metal conductivity of copper-clad plate |
-
2013
- 2013-09-25 CN CN201320594415.7U patent/CN203465355U/en not_active Expired - Lifetime
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103487666A (en) * | 2013-09-25 | 2014-01-01 | 长沙新图仪器有限公司 | Resonant cavity test device used for testing dielectric constant of materials |
| CN103487666B (en) * | 2013-09-25 | 2015-12-23 | 长沙新图仪器有限公司 | A kind of resonator cavity proving installation for material dielectric constant test |
| CN106680590A (en) * | 2015-11-11 | 2017-05-17 | 上海西门子线路保护系统有限公司 | Dielectric property test device |
| CN107490727A (en) * | 2017-08-17 | 2017-12-19 | 河南师范大学 | A kind of dielectric constant measurement method of composite microwave sensor and measured object |
| CN107490727B (en) * | 2017-08-17 | 2019-10-18 | 河南师范大学 | A kind of dielectric constant measurement method of composite microwave sensor and measured object |
| CN109696583A (en) * | 2019-02-26 | 2019-04-30 | 航天材料及工艺研究所 | Silicon nitride fiber sample, method for making sample and test method for dielectric properties test |
| CN109696583B (en) * | 2019-02-26 | 2021-07-13 | 航天材料及工艺研究所 | Silicon nitride fiber sample for dielectric property test, sample preparation method and test method |
| CN109916967A (en) * | 2019-03-28 | 2019-06-21 | 中国科学院上海硅酸盐研究所 | A kind of resonant cavity test device for the test of material at high temperature dielectric properties |
| CN111257370A (en) * | 2020-03-05 | 2020-06-09 | 西北工业大学 | Device and method for measuring dielectric constant and metal conductivity of copper-clad plate |
| CN111257370B (en) * | 2020-03-05 | 2021-03-23 | 西北工业大学 | Device and method for measuring dielectric constant and metal conductivity of copper-clad plate |
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Granted publication date: 20140305 |