CN108508242B - Flange coaxial device for testing shielding effectiveness of material - Google Patents
Flange coaxial device for testing shielding effectiveness of material Download PDFInfo
- Publication number
- CN108508242B CN108508242B CN201810718717.8A CN201810718717A CN108508242B CN 108508242 B CN108508242 B CN 108508242B CN 201810718717 A CN201810718717 A CN 201810718717A CN 108508242 B CN108508242 B CN 108508242B
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- 239000000463 material Substances 0.000 title claims abstract description 51
- 238000012360 testing method Methods 0.000 title claims abstract description 39
- 239000004020 conductor Substances 0.000 claims description 42
- 230000005540 biological transmission Effects 0.000 claims description 7
- 239000000523 sample Substances 0.000 description 16
- 239000013074 reference sample Substances 0.000 description 5
- 238000000691 measurement method Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 239000007769 metal material Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 229910052755 nonmetal Inorganic materials 0.000 description 3
- -1 polytetrafluoroethylene Polymers 0.000 description 3
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 3
- 239000004810 polytetrafluoroethylene Substances 0.000 description 3
- 230000007704 transition Effects 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 238000005553 drilling Methods 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910001369 Brass Inorganic materials 0.000 description 1
- 239000004677 Nylon Substances 0.000 description 1
- 239000011358 absorbing material Substances 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000010951 brass Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000005672 electromagnetic field Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 238000001028 reflection method Methods 0.000 description 1
- 238000007655 standard test method Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/02—General constructional details
- G01R1/04—Housings; Supporting members; Arrangements of terminals
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
- G01R29/08—Measuring electromagnetic field characteristics
- G01R29/0807—Measuring electromagnetic field characteristics characterised by the application
- G01R29/0814—Field measurements related to measuring influence on or from apparatus, components or humans, e.g. in ESD, EMI, EMC, EMP testing, measuring radiation leakage; detecting presence of micro- or radiowave emitters; dosimetry; testing shielding; measurements related to lightning
- G01R29/0835—Testing shielding, e.g. for efficiency
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/001—Measuring interference from external sources to, or emission from, the device under test, e.g. EMC, EMI, EMP or ESD testing
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Sampling And Sample Adjustment (AREA)
- Testing Electric Properties And Detecting Electric Faults (AREA)
Abstract
The invention provides three support screws (3) on a chassis (1), which provide three application points with space symmetry for clamping a tested material sample (8), can provide uniform and stable support, effectively reduce the gap between the tested material sample and a flange, improve the accuracy of a test result, and the like.
Description
Technical Field
The invention relates to the field of material shielding effectiveness test, in particular to a flange coaxial device for material shielding effectiveness test.
Background
Electromagnetic shielding or wave absorbing materials are widely applied to military and civil fields such as electromagnetic pulse protection, electromagnetic compatibility and the like, and the shielding effectiveness is a key index for representing the shielding property of the materials. The current standards for the material shielding effectiveness test method are as follows: GB/T30142-2013 shielding effectiveness measurement method of planar electromagnetic shielding material, GB/T25471-2010 shielding effectiveness measurement method of electromagnetic shielding paint, GJB 6190-2008 shielding effectiveness measurement method of electromagnetic shielding material, SJ 20524-1995 shielding effectiveness measurement method of material, wherein the flange coaxial devices adopted by the several standards are all from D4935 standard (Standard Test Method for Measuring the Electromagnetic Shielding Effectiveness of Planar Materials, latest edition 2010) of American Society for Testing and Materials (ASTM). The device requires that the material sample to be tested is assembled inside the flange coaxial device and fixed with nylon screws (see GB/T30142-2013 annex A), or clamped between two opening flanges with a specific guide rail clamp (see GB/T30142-2013 annex B), and the application is wider because the test frequency range (30 MHz-3 GHz) for the latter covers the former (30 MHz-1.5 GHz), and the drilling of the sample is not required (many material samples do not meet the drilling condition). However, in practical use, the device has been found to have the following problems:
(1) because the sliding guide rail can only be installed at the bottom end of the flange support, when the material sample is clamped by the guide rail clamp, the force application point can only be at the side, close to the flange base, of the material sample, and the other side, far away from the flange base, cannot be clamped, so that an air gap is easy to appear, and the accuracy of a test result is affected. This problem is particularly pronounced when testing samples of material having a relatively large thickness;
(2) the sliding guide rail clamp is designed with only one force application point, so that a flange plate with larger size cannot be installed because the coaxial central axis of the flange is closer to the guide rail to ensure clamping force;
(3) the sliding guide rail clamp is designed with only one force application point, so that the guide rail clamp is made of metal materials in actual manufacturing to ensure clamping force, and the accuracy of the coaxial test result of the opening flange is adversely affected;
(4) although the rail clamp can be horizontally placed, in order to mount the reference sample in actual test, the rail clamp must be vertically placed, and therefore, a device capable of being vertically fixed and the like must be additionally designed.
Disclosure of Invention
In order to overcome the defects in the background art, the invention provides a flange coaxial device for testing the shielding effectiveness of materials.
In order to achieve the aim of the invention, the invention adopts the following technical scheme:
the utility model provides a coaxial device of flange for material shielding effectiveness test, includes chassis, supporting screw, well dish, upper disc, lower flange coaxial and upper flange coaxial the upper interval on chassis is equipped with three supporting screw and forms the screw rod group, is equipped with the external screw thread on the outer fringe face of every supporting screw, is equipped with well dish in the well lower part of screw rod group be equipped with down the coaxial on well dish, be equipped with upper flange coaxial in the top of well dish, be equipped with the upper disc on the upper flange coaxial, lower flange coaxial, well dish be the concentric setting, be equipped with the material sample of being surveyed between upper flange coaxial and the lower flange coaxial, the coaxial device of flange that is arranged in the coaxial and lower flange coaxial of upper flange N type coaxial connector is connected vector network analyzer through coaxial transmission line respectively and is formed the coaxial device of flange for material shielding effectiveness test.
The three supporting screws are uniformly distributed on the chassis at equal intervals in a triangular shape.
The lower ends of the three supporting screws are connected with the internal threads on the chassis through threads and are locked and fixed through the positioning nuts.
The flange coaxial device for testing the shielding effectiveness of the material comprises an upper flange, a lower flange, a support ring, an inner conductor and an N-type coaxial connector, wherein the support ring is arranged in the middle of the outer flange, the inner conductor is arranged in the middle of the support ring, and the N-type coaxial connector is arranged at the upper end of the inner conductor.
The flange coaxial device for testing the shielding effectiveness of the material comprises a lower flange, an outer conductor flange, a supporting ring, an inner conductor and an N-type coaxial connector, wherein the supporting ring is arranged in the middle of the outer conductor flange, the inner conductor is arranged in the middle of the supporting ring, and the N-type coaxial connector is arranged at the lower end of the inner conductor.
The flange coaxial device for testing the shielding effectiveness of the materials is characterized in that three through holes are formed in the middle plate and are uniformly and equidistantly arranged in a triangular shape, the hole distances and the hole diameters of the three through holes are consistent with the distance and the diameter of the three supporting screws, and supporting ring perforation holes are formed in the middle of the middle plate.
The flange coaxial device for testing the shielding effectiveness of the materials is characterized in that three through holes are formed in the upper disc, the three through holes are uniformly and equidistantly arranged in a triangular shape, the hole distances and the hole diameters of the three through holes are consistent with the distance and the diameter of the three supporting screws, and supporting ring perforation is formed in the middle of the upper disc.
The flange coaxial device for testing the shielding effectiveness of the materials is characterized in that a first group of positioning nuts are respectively arranged at the middle lower part of each supporting screw in the screw group, a middle plate is arranged on the positioning nuts, a second group of positioning nuts are respectively arranged on the outer edge surface of each supporting screw above the middle plate, an upper plate is arranged on the second group of positioning nuts, and a third group of positioning nuts are respectively arranged on the outer edge surface of each supporting screw above the upper plate.
By adopting the technical scheme, the invention has the following advantages:
according to the invention, three supporting screws are arranged on the chassis, three spatially symmetrical force application points are provided for clamping the tested material sample, uniform and stable support can be provided, the gap between the tested material sample and the flange is effectively reduced, the accuracy of a test result is improved, and the like.
Drawings
FIG. 1 is a schematic perspective view of the present invention;
FIG. 2 is a schematic diagram of an exploded construction of the present invention;
FIG. 3 is a schematic illustration of the coaxial construction of the middle flange of the present invention;
FIG. 4 is a schematic diagram of the connection of the present invention to a vector network analyzer;
in the figure: 1. a chassis; 2. positioning a nut; 3. a support screw; 4. a middle plate; 5. a top plate; 6. the lower flange is coaxial; 7. the upper flange is coaxial; 8. a sample of the material being tested; 9. an outer conductor flange; 10. a support ring; 11. an inner conductor; 12. an N-type coaxial connector.
Detailed Description
The present invention will be explained in more detail by the following examples, which are not intended to limit the scope of the invention;
it should be noted that, in describing the structure, the directions or positional relationships indicated by "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of description and simplification of description, and do not indicate or imply that the apparatus or element to be referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.
The flange coaxial device for testing the shielding effectiveness of materials comprises a chassis 1, supporting screws 3, a middle plate 4, an upper plate 5, a lower flange coaxial 6 and an upper flange coaxial 7, wherein three supporting screws 3 are arranged on the chassis 1 at intervals to form a screw group, the three supporting screws 3 are uniformly distributed on the chassis 1 at equal intervals in a triangular mode, lower end wires of the three supporting screws 3 are connected with internal threads on the chassis 1 and are locked and fixed through positioning nuts 2, external threads are arranged on the outer edge surface of each supporting screw 3, a middle plate 4 is arranged at the middle lower part of the screw group, the position of the middle plate 4 can be arranged on the upper part of the screw group, the position of the middle plate is required to be provided with an operating space only when the lower flange 6 is required to be connected with a coaxial transmission line, the lower flange coaxial 6 is arranged on the middle plate 4, the upper flange coaxial 7 is arranged on the upper flange coaxial 7, the upper plate 5 is arranged on the upper flange coaxial 7, the lower flange 5 is connected with the upper flange coaxial 7, the lower flange 6 is provided with a coaxial flange coaxial 4, a coaxial flange is arranged on the lower flange coaxial 7, a coaxial flange is connected with a coaxial flange device for testing the coaxial meter coaxial 4, and a coaxial flange is arranged between the lower flange coaxial flange 6 and a coaxial flange coaxial device for testing the coaxial flange is required to be connected with a coaxial flange device for testing a coaxial meter coaxial material, and a coaxial meter coaxial 4 is arranged between the upper flange and a coaxial meter coaxial flange 6 and a coaxial meter coaxial device for testing a coaxial meter is arranged between the flange 6 and a coaxial meter coaxial flange is required to be connected with a coaxial flange device.
The middle plate 4 and the upper plate 5 have the same structure, and are only used for installing the lower flange coaxial 6 and compacting the upper flange coaxial 7 respectively, and simultaneously, the upper flange coaxial 7 and the lower flange coaxial 6 are guaranteed to be aligned in the axial center after being installed, the upper flange coaxial 7 and the lower flange coaxial 6 have the same structure, the upper flange coaxial 7 comprises an outer conductor flange 9, a supporting ring 10, an inner conductor 11 and an N-type coaxial connector 12 (female), the middle part of the outer conductor flange 9 is provided with the supporting ring 10, the middle part of the supporting ring 10 is provided with the inner conductor 11, the upper end of the inner conductor 11 is provided with the N-type coaxial connector 12, and the inner conductor 11 and the outer conductor flange 9 are both in conical transition sections (the structure is identical with the flange coaxial adopted in the standards of GB/T30142-2013). The lower flange coaxial 6 comprises an outer conductor flange 9, a support ring 10, an inner conductor 11 and an N-type coaxial connector 12, wherein the support ring 10 is arranged in the middle of the outer conductor flange 9, the inner conductor 11 is arranged in the middle of the support ring 10, the N-type coaxial connector 12 is arranged at the lower end of the inner conductor 11, and the inner conductor 11 and the outer conductor flange 9 are both in conical transition sections (the structure is the same as that of the flange coaxial used in the standards of GB/T30142-2013 and the like).
Further, three through holes are formed in the middle plate 4, the three through holes are uniformly and equidistantly arranged in a triangular shape, the pitch and the aperture of the three through holes are consistent with those of the three supporting screws 3, a supporting ring perforation is formed in the middle of the middle plate 4, and a supporting ring 10 on the lower flange coaxial 6 penetrates through the supporting ring perforation from top to bottom and extends out of the lower surface of the middle plate 4. The upper disc 5 is provided with three through holes which are uniformly arranged at equal intervals in a triangular shape, the pitch and the aperture of the three through holes are consistent with those of the three supporting screws 3, the middle part of the upper disc 5 is provided with supporting ring perforation, and the supporting ring 10 on the upper flange coaxial 7 passes through the supporting ring perforation from bottom to top and extends out of the upper disc 5. In the implementation, the axes of the support ring perforation holes arranged in the middle of the middle disc 4 and the upper disc 5 are coincident, so that the concentricity of the upper flange coaxial 7 and the lower flange coaxial 6 after installation is reduced.
Further, a first set of positioning nuts 2 are respectively arranged at the middle lower part of each supporting screw 3 in the screw set, a middle disc 4 is arranged on the upper surface of each positioning nut 2, a second set of positioning nuts 2 are respectively arranged on the outer edge surface of each supporting screw 3 above the middle disc 4, an upper disc 5 is arranged on the second set of positioning nuts 2, and a third set of positioning nuts 2 are respectively arranged on the outer edge surface of each supporting screw 3 above the upper disc 5.
The invention comprises the following steps:
(1) three supporting screws 3 are fixed in three corresponding mounting holes of the chassis 1 and are fixed by positioning nuts 2 (if necessary, one positioning nut 2 can be correspondingly added on the back of the chassis 1, so that the mounting stability is improved).
(2) After the three supporting screws 3 are respectively provided with one positioning nut 2, the three supporting screws are placed into the middle plate 4, three mounting holes are reserved on the surface of the middle plate 4, the aperture is consistent with the supporting screws 3, a supporting ring perforation coaxial with a flange is reserved in the center of the surface of the plate, a leveling instrument is utilized after the middle plate 4 is placed, the surface of the plate is adjusted to be horizontal by matching with the three positioning nuts 2, and a hard nonmetal gasket is suggested to be added at the contact position of the three positioning nuts 2 and the middle plate 4 so as to improve the mounting stability.
(3) A lower flange coaxial 6 is installed at the perforation of the supporting ring in the middle of the middle disc 4, and a tested material sample 8 (or a reference sample) and an upper flange coaxial 7 are sequentially placed on the lower flange coaxial 6.
(4) After each of the three supporting screws 3 is provided with one positioning nut 2, the three supporting screws are placed into the upper disc 5, each positioning nut 2 is further provided with one positioning nut, and the tail part of the upper flange coaxial 7 penetrates out from the central positioning hole of the upper disc 5. The positions of the six positioning nuts 2 are adjusted so that the upper disc 5 can press the tested material sample 8 and the upper flange shaft 7, and it is recommended to add a hard nonmetallic gasket at the position where the six positioning nuts 2 are contacted with the upper disc 5 so as to improve the installation stability.
The upper flange coaxial 7 or the lower flange coaxial 6 shown in fig. 3 includes an outer conductor flange 9 and an inner conductor 11 made of metal material such as brass, a polytetrafluoroethylene support ring 10 filled between the inner and outer conductors, and an N-type coaxial connector (female) 12 mounted at the tail. The inner conductor and the outer conductor which are coaxial with the flange are both tapered transition sections, and the structure is coaxial and consistent with the flange adopted in GB/T30142-2013 and other standards.
In the invention, the upper flange coaxial 7 and the lower flange coaxial 6 are all required to be made of nonmetal materials (polytetrafluoroethylene, glass or the like can be adopted) so as to reduce the influence of electromagnetic reflection generated by metal objects on a test result. Meanwhile, the thickness of the tested material sample 8 is not more than 1/100 of the wavelength of the highest test frequency and not more than 1/3 of the radius of the outer conductor flange 9, and the radius of the outer conductor flange 9 is not less than 5 times of the radius of the inner conductor 11 so as to reduce the influence of the coaxial leakage electromagnetic field of the opening on the test result.
The method for testing the shielding effectiveness of the material comprises the following steps:
(1) the invention is put in place according to the procedure described above, taking care that now a reference sample (the requirements for which are as specified in GB/T30142-2013 "method for measuring shielding effectiveness of planar electromagnetic shielding materials") is installed between the upper flange coaxial 7 and the lower flange coaxial 6.
(2) The two tail end N-type coaxial connectors (female) 12 of the upper flange coaxial 7 and the lower flange coaxial 6 are respectively connected into coaxial transmission lines and are connected to two ports of a vector network analyzer for transmission calibration. A schematic diagram of the connection of the invention with a vector network analyzer is shown in FIG. 4.
(3) Slightly loosening the upper and lower positioning nuts 2 of the upper disc 5, taking out the reference sample, putting the reference sample into the measured material sample 8, and then re-fastening the positioning nuts 2; the shielding effectiveness of the test material sample 8 was tested.
Further, the transmission and reflection characteristics of the material sample are tested by means of a vector network analyzer (S 21 And S is 11 ) The dielectric constant and permeability of the material can also be calculated based on the Nicloson transmission/reflection method.
The beneficial effects of the invention are as follows:
(1) according to the invention, three supporting screws 3 and positioning nuts 2 are designed, three application points which are symmetrical in space are provided for clamping the material sample, uniform and stable support can be provided, the gap between the tested material sample and the flange is effectively reduced, and the accuracy of the test result is improved;
(2) the size of the middle disc 4 and the upper disc 5 of the invention can be much larger than that of the upper flange coaxial 7 and the lower flange coaxial 6, and enough space allowance is enough to enable the device to be suitable for installing flange coaxial with different sizes;
(3) the invention (except the coaxial of the division flange) can be made of non-metal materials such as glass or polytetrafluoroethylene, and the influence of unnecessary metal structures on test results can be greatly reduced;
(4) the invention adopts a self-stable vertical structure design, and a vertical fixing device is not required to be additionally designed.
The invention is not described in detail in the prior art.
The embodiments selected herein for the purposes of disclosing the present invention are presently considered to be suitable, however, it is to be understood that the present invention is intended to include all such variations and modifications as fall within the spirit and scope of the present invention.
Claims (6)
1. The utility model provides a coaxial device of flange for material shielding effectiveness test, includes chassis (1), supporting screw (3), well dish (4), goes up dish (5), lower flange coaxial (6) and goes up flange coaxial (7), characterized by: the upper surface of the chassis (1) is provided with three supporting screws (3) at intervals to form a screw group, the middle lower part of each supporting screw (3) in the screw group is respectively provided with a first group of positioning nuts (2), the middle part of each supporting screw (3) above the positioning nuts (2) is provided with a middle disc (4), the outer edge surface of each supporting screw (3) above the middle disc (4) is respectively provided with a second group of positioning nuts (2), the upper surface of each supporting screw (3) above the upper disc (5) is provided with an upper disc (5), the outer edge surface of each supporting screw (3) above the upper disc (5) is respectively provided with a third group of positioning nuts (2), the three supporting screws (3) are uniformly distributed on the chassis (1) at equal intervals in a triangular shape, the outer edge surface of each supporting screw (3) is provided with external threads, the middle disc (4) is arranged at the middle lower part of the screw group, the upper surface of each supporting screw (4) is provided with a lower flange coaxial (6), the upper flange coaxial (7) above the middle disc (4), the upper flange coaxial (7) is arranged on the upper flange coaxial (7), the upper flange (7) and the lower flange coaxial (7) are arranged on the upper flange coaxial (7), the upper flange coaxial (7) and the lower flange coaxial (6) are respectively connected with an N-type coaxial connector (12) through a coaxial transmission line to form the flange coaxial device for testing the shielding effectiveness of the material.
2. The flanged coaxial arrangement for material shielding effectiveness testing of claim 1, wherein: the lower ends of the three supporting screws (3) are connected with the internal threads on the chassis (1) through threads and are locked and fixed through the positioning nuts (2).
3. The flanged coaxial arrangement for material shielding effectiveness testing of claim 1, wherein: the upper flange coaxial (7) comprises an outer conductor flange (9), a support ring (10), an inner conductor (11) and an N-type coaxial connector (12), wherein the support ring (10) is arranged in the middle of the outer conductor flange (9), the inner conductor (11) is arranged in the middle of the support ring (10), and the N-type coaxial connector (12) is arranged at the upper end of the inner conductor (11).
4. The flanged coaxial arrangement for material shielding effectiveness testing of claim 1, wherein: the lower flange coaxial (6) comprises an outer conductor flange (9), a support ring (10), an inner conductor (11) and an N-type coaxial connector (12), wherein the support ring (10) is arranged in the middle of the outer conductor flange (9), the inner conductor (11) is arranged in the middle of the support ring (10), and the N-type coaxial connector (12) is arranged at the lower end of the inner conductor (11).
5. The flanged coaxial arrangement for material shielding effectiveness testing of claim 1, wherein: the middle plate (4) is provided with three through holes, the three through holes are uniformly arranged at equal intervals in a triangular shape, the pitch and the aperture of the three through holes are consistent with the pitch and the diameter of the three supporting screws (3), and the middle part of the middle plate (4) is provided with supporting ring perforations.
6. The flanged coaxial arrangement for material shielding effectiveness testing of claim 1, wherein: the upper disc (5) is provided with three through holes, the three through holes are uniformly arranged at equal intervals in a triangular shape, the pitch and the aperture of the three through holes are consistent with those of the three supporting screws (3), and the middle part of the upper disc (5) is provided with supporting ring perforations.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810718717.8A CN108508242B (en) | 2018-07-03 | 2018-07-03 | Flange coaxial device for testing shielding effectiveness of material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810718717.8A CN108508242B (en) | 2018-07-03 | 2018-07-03 | Flange coaxial device for testing shielding effectiveness of material |
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| Publication Number | Publication Date |
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| CN108508242A CN108508242A (en) | 2018-09-07 |
| CN108508242B true CN108508242B (en) | 2024-02-09 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201810718717.8A Active CN108508242B (en) | 2018-07-03 | 2018-07-03 | Flange coaxial device for testing shielding effectiveness of material |
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| CN (1) | CN108508242B (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109521458B (en) * | 2018-11-21 | 2023-11-24 | 中国标准化研究院 | Device and method for testing radiation protection performance |
| CN112731514B (en) * | 2020-12-22 | 2022-10-28 | 中国原子能科学研究院 | Base of measuring device |
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| CN104237575A (en) * | 2014-10-10 | 2014-12-24 | 天津工业大学 | Coaxial fixture for testing of electromagnetic property of material |
| CN205176171U (en) * | 2015-11-20 | 2016-04-20 | 上海市计量测试技术研究院 | Rectangular waveguide testing arrangement and system |
| CN107727489A (en) * | 2017-08-30 | 2018-02-23 | 中国航发北京航空材料研究院 | A kind of clamping and fixing device of sheet metal compression |
| CN208283438U (en) * | 2018-07-03 | 2018-12-25 | 中国人民解放军61489部队 | A kind of flange coaxial device for Materials ' Shielding Effectiveness test |
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