CN104198975B - Extremely-low-frequency radio wave shielding test device - Google Patents
Extremely-low-frequency radio wave shielding test device Download PDFInfo
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- CN104198975B CN104198975B CN201410465527.1A CN201410465527A CN104198975B CN 104198975 B CN104198975 B CN 104198975B CN 201410465527 A CN201410465527 A CN 201410465527A CN 104198975 B CN104198975 B CN 104198975B
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Abstract
Disclosed is an extremely-low-frequency radio wave shielding test device. The device comprises a radio wave shielding cylinder and an in-cylinder test coil, the in-cylinder test coil is located in the radio wave shielding cylinder, the radio wave shielding cylinder comprises a first cylinder end cover, a second cylinder end cover, a thick-wall metal tube, screws, a dual hole cover and a shielding cover, the first cylinder end cover, the thick-wall metal tube and the second cylinder end cover are fixed into a whole through the screws to form a shielding cavity body portion of the extremely-low-frequency radio wave shielding test device, a disc support supporting a test solenoidal coil, a protective casing located outside the test solenoidal coil, the test solenoidal coil and a round tube used for winding of the test solenoidal coil are distributed in the in-cylinder test coil from outside to inside, a tube support and a test tube are arranged in a hole of the round tube, and the tube support is used for supporting the test tube. The extremely-low-frequency radio wave shielding test device is wide in shielding range, integrally airtight and high in shielding properties, good in shielding effect on medium and low frequency band radio waves, and applicable to professional laboratories.
Description
Technical field
The present invention relates to wave shield field, more particularly, to a kind of extremely low frequency wave shield test device is low as satellite
The electromagnetic detection screening test of each coil component on the three-dimensional search coil pickoff of frequency electromagnetic waves detector.
Background technology
Low frequency radio shield technology refers to: using high conductivity both equivalent potential screen bulk properties of good conductive material, shape
Become the area of space of electromagnetism relative clean, let out for shielding the electric wave that the outside alternation electric wave of certain spatial areas produces to its inside
The interference such as leakage.For the extremely low frequency electric wave of 10hz magnitude, due to electro magnetic in shielded conductor layer within skin depth obvious
Increase or the surface current layer substantially unfavorable factor such as thickening, now, radio wave shield not only will have to usual exchange shield very
The conventional measure such as good ground structure and extremely low earth resistance, also needs using the shield wall of multilamellar or thickening and high
The wall conductive material of electrical conductivity, to avoid the thicker low frequency skin surface current layer that becomes to penetrate into inside shield.Atomic detecting
Weak low frequency radio, especially with high magnetic conduction soft magnetic core solenoid measure faint low frequency radio when, such radio wave shield
Particularly important.
When satellite spatial detects, due to magnetosphere space wave to be detected extremely faint it is desirable to the low-frequency electrical that adopts
Wave detector possesses the strict technical parameters and performance such as high electromagnetic susceptibilty, resolution and long-term working stability.
Therefore in each link of detector device development process or in the stage, need for disparity items, type and performance requirement to spy
Survey device carries out many-side and strictly detects and parameter calibration.But, in current test room environmental, it is difficult to simulate outer space
Real physical environment and low interference physical background, and the severe specifications detection reaching higher standard is increasingly difficult.Low with background
Frequency electromagnetic noise is less than 10-5nt/(hz)1/2Environment as a example, tight in order to realize the low frequency radio detector device to this wave band
The detection of lattice ground and demarcation, need to have extremely low frequency electric wave to be carried out shield and the sensor search coil of detector can be made simultaneously again
The device of basic test, screening and demarcation, can only adopt unconventional metallic shield cylinder side wall to thicken at present in the lab
Screen method carrys out the spatial environmentss that simulated implementation meets this electromagnetism index.
Content of the invention
It is an object of the invention to, overcome noise background in laboratory actual environment that highly sensitive low frequency radio is detected
The interference that in device detection simulation space, Extremely Low Frequency Electromagnetic signal causes, thus provide a kind of extremely low frequency wave shield test device.
For achieving the above object, the extremely low frequency wave shield test device of the present invention includes:
Wave shield cylinder 1 and cylinder build-in test coil 2, described cylinder build-in test coil 2 is located in described wave shield cylinder 1；
Described wave shield cylinder 1 includes: first end cap 1-1, second end cap 1-2, thick-wall metal pipes 1-3, screw rod 1-
4th, dual port lid 1-5 and screening cover 1-57；Described first end cap 1-1 and described second end cap 1-2 is located at described heavy wall gold
Belong to the two ends of pipe 1-3；Described dual port lid 1-5 closes described second end cap 1-2, and described screening cover 1-57 is used for covering closing
Described dual port lid 1-5；By described first end cap 1-1, described thick-wall metal pipes 1-3 and described second end cap 1-2 pass through
Described screw rod 1-4 is integrally fixed, and forms the shielding cavity body part of extremely low frequency wave shield test device；
Described cylinder build-in test coil 2 is distributed with from outside to inside and supports the disc carrier 2-2 of test solenoid coil 2-1, is located at
Protection sleeve pipe 2-7 outside test solenoid coil 2-1, test solenoid coil 2-1, the described test solenoid coil 2- of winding
1 pipe 2-6；It is used for supporting the pipe holder 2-5 and testing tube 2-4 of testing tube 2-4 positioned at described pipe 2-6 in the hole；Described survey
The length of test tube 2-4 is more than the length of described test solenoid coil 2-1.
In technique scheme, described first end cap 1-1 along central axis be provided with from inside to outside round basin connected in star 1-11,
Annular groove 1-12, screw 1-13；Described second end cap 1-2 is provided with through hole 1-21, first annular groove 1-22, hole from inside to outside
1-23；The yardstick of described annular groove 1-12 and shape are determined by the end geometry of described thick-wall metal pipes 1-3, described ring
The depth of groove of connected in star 1-12 is not less than the 1/2 of described thick-wall metal pipes 1-3 wall thickness dimension.
In technique scheme, described dual port lid 1-5 includes: first order port lid 1-51 and second level port lid 1-55；Institute
State and first order port lid through hole 1-53 is offered on first order port lid 1-51, first order port lid top 1-52 is provided around first order hole
The second cannelure 1-54 of lid through hole 1-53；Described second level port lid 1-55 is provided with signal string holes 1-56.
In technique scheme, the side wall of described screening cover 1-57 has fairlead 1-58；Described first order port lid top
Portion 1-52 is provided with u-shaped handle 1-59, is provided with knob 1-510 and middle part screw 1-511 in the middle part of described u-shaped handle 1-59；Described
Knob 1-510 is used for compressing screening cover 1-57.
In technique scheme, described second level port lid 1-55 is used for closing described first order port lid through hole 1-53, described
Screening cover 1-57 is used for covering the described second level port lid 1-55 of closing；It is provided with coaxial line at two footing of described u-shaped handle 1-59
Axis hole, described first order port lid top 1-52 is cylinder, and its side wall radially opens up two screws, and this two screws are coaxial
Line, the line of centres of two screws is intersected with described first order port lid 1-51 central axis upright, and this two screws are used for installing
Run through the fixing bolt 1-512 of axis hole at described u-shaped handle 1-59 two footing, described first order port lid top 1-52 opens vertically
If the through hole penetrating for described second level port lid 1-55.
In technique scheme, described first order port lid 1-51 is used for directly blocking described through hole 1-21, the described first order
Port lid top 1-52 is with diameter greater than the 1/3 of described through hole 1-21 diameter；Described first order port lid 1-51 and described second level port lid
1-55 is all to become the not isometrical cylinder of the coaxial line of t shape to constitute by its structure along the section of central axis, by directly blocking perforate
Rectangle buckle fastening in interior small-diameter circular cylinder section.
In technique scheme, described test solenoid coil 2-1 body end and described first end cap 1-1 and described
Between second end cap 1-2 inwall, spacing is not less than the 1/2 of described test solenoid coil 2-1 body diameter；The described first order
The external diameter with diameter greater than described protection sleeve pipe 2-7 for the port lid through hole 1-53.
The invention has the advantages that:
1st, the extremely low frequency wave shield test device reasonable in design of the present invention, quilt that is easy and simple to handle, being suitable to long yardstick
Survey line shaft detection；
2nd, the extremely low frequency wave shield test device population structure quality of fit of the present invention is high, electromagnetic sealing is good, part
Hole leakage is little, it is easy to accomplish the high precision test of ten hertz of level low frequency light current ripples；
3rd, the extremely low frequency wave shield test device shield ranges width of the present invention, Integral sealing and shielding propertiess are strong, especially
Centering low-frequency range wave shield effect is good, and suitable specialized laboratory uses.
4th, the extremely low frequency wave shield test device of the present invention contributes to producing high-quality spaceborne low frequency radio detection
Device, such detector is suitable for detecting extremely faint magnetosphere space wave.
Brief description
Fig. 1 is the 3-D view of the extremely low frequency wave shield test device of the present invention；
Fig. 2 is the 3-D view of the wave shield cylinder of extremely low frequency wave shield test device of the present invention；
Fig. 3 is the 3-D view of the cylinder build-in test coil of the extremely low frequency wave shield test device of the present invention；
Fig. 4 is the double-hole cover structural component 3-D view of the extremely low frequency wave shield test device of the present invention.
Accompanying drawing identifies:
12, wave shield cylinder build-in test coil 3 tube stent
Second end cap 1-3 thick-wall metal pipes of first end cap 1-2 of 1-1
1-4 screw rod 1-5 dual port lid 1-6 holding wire exit
3-1 cylinder 3-2 ground stud
1-11 justifies basin connected in star 1-12 annular groove 1-13 screw
1-21 through hole 1-22 first annular groove 1-23 hole
1-24 nut
1-51 first order port lid 1-52 first order port lid top 1-53 first order port lid through hole
1-54 the second cannelure 1-55 second level port lid 1-56 signal string holes
1-57 screening cover 1-58 fairlead 1-59u type handle
Screw 1-512 fixing bolt in the middle part of 1-510 knob 1-511
2-1 test solenoid coil 2-2 disc carrier 2-3 links screw rod
2-4 testing tube 2-5 pipe holder 2-6 pipe
2-7 protects sleeve pipe
Specific embodiment
With reference to the accompanying drawings and examples the extremely low wave shield test device of the present invention is described in detail, and passes through
Following technical proposals are achieved.
As shown in figures 1 and 3, extremely low wave shield test device according to an embodiment of the invention includes: electric wave
Shielding cylinder 1 and cylinder build-in test coil 2, wherein cylinder build-in test coil 2 are located in wave shield cylinder 1.
As shown in Figure 1 and Figure 4, wave shield cylinder 1 includes: first end cap 1-1, second end cap 1-2, thick-wall metal pipes
1-3, screw rod 1-4, dual port lid 1-5 and screening cover 1-57；Described first end cap 1-1 and described second end cap 1-2 is located at
The two ends of described thick-wall metal pipes 1-3；Described dual port lid 1-5 closes described second end cap 1-2, and described screening cover 1-57 uses
Close described dual port lid 1-5 in covering；By described first end cap 1-1, described thick-wall metal pipes 1-3 and described second end
Lid 1-2 is integrally fixed by described screw rod 1-4, forms the shielding cavity body part of extremely low frequency wave shield test device；
First end cap 1-1, second end cap 1-2 and thick-wall metal pipes 1-3 are by the metal material of excellent conductive performance
Make；In the present embodiment, screw rod 1-4 has 6；The structure dimension of first end cap 1-1 and second end cap 1-2 is: long
95mm, external diameter is φ 350mm；The structure dimension of thick-wall metal pipes 1-3 is: long 1350mm, internal diameter φ 200mm, external diameter φ
280mm, wall thickness 40mm.
As shown in Fig. 2 first end cap 1-1 is provided with round basin connected in star 1-11, annular groove from inside to outside along central axis
1-12, screw 1-13；The yardstick of annular groove 1-12 and shape are determined by the end geometry of thick-wall metal pipes 1-3, annular
Groove 1-12 depth dimensions is not less than the 1/2 of thick-wall metal pipes 1-3 wall thickness dimension；Screw rod 1-4 passes through screw 1-13；In this enforcement
In example, the yardstick of annular groove 1-12 is: diameter phi 280mm, depth 25mm；Screw 1-13 has 6, a diameter of φ 16mm.
As shown in Fig. 2 second end cap 1-2 along central axis be provided with from inside to outside through hole 1-21, first annular groove 1-22,
Hole 1-23；Screw rod 1-4 is fixed through hole 1-23 by nut 1-24；In the present embodiment, through hole 1-21 yardstick is diameter phi 76mm；
Hole 1-23 has 6, and yardstick is diameter phi 16mm.
As shown in Figure 3 and Figure 4, dual port lid 1-5 includes: first order port lid 1-51, second level port lid 1-55；First order hole
First order port lid through hole 1-53 is offered, first order port lid top 1-52 is provided around first order port lid through hole 1-53 on lid 1-51
The second cannelure 1-54；Second level port lid 1-55 is provided with signal string holes 1-56.
As shown in Figure 1 and Figure 4, the side wall of screening cover 1-57 has fairlead 1-58；On first order port lid top 1-52
It is provided with u-shaped handle 1-59, in the middle part of u-shaped handle 1-59, be provided with knob 1-510 and the middle part with first order port lid 1-51 axis coaxle
Screw 1-511, knob 1-510 are used for compressing screening cover 1-57.
As shown in Figure 3 and Figure 4, port lid 1-55 in the second level is used for closing first order port lid through hole 1-53, and screening cover 1-57 covers
Lid closing second level port lid 1-55；It is provided with the axis hole of coaxial line, first order port lid top 1-52 at two footing of u-shaped handle 1-59
For cylinder, its side wall radially opens up two screws, this two screw coaxial lines, and the line of centres of two screws is central shaft
Line is intersected with first order port lid 1-51 central axis upright, and this two screws run through at u-shaped handle 1-59 two footing for installing
The fixing bolt 1-512 of axis hole, first order port lid top 1-52 opens up the through hole penetrating for second level port lid 1-55 vertically.
In the present embodiment, first order port lid top 1-52 yardstick is: external diameter φ 135mm, thickness 30mm；First order port lid
Through hole 1-53 yardstick is diameter phi 30mm；The yardstick of the second annular groove 1-54 is: diameter phi 70mm, depth 5mm；Second level hole
The yardstick of lid 1-55 top cap part is: external diameter φ 70mm, thickness 20mm；The yardstick of signal string holes 1-56 is diameter phi 5mm；Shielding
Lid 1-57 is drum type structure, and wall thickness is 25mm；The yardstick of the fairlead 1-58 on the side wall of screening cover 1-57 is diameter phi
5mm；The overall dimensions of u-shaped handle 1-59 are 148mm × 120mm × 16mm；The round shaft cap of knob 1-510 a size of φ 50mm
×12mm；Cross dimensions at the screw 1-511 position of middle part for the u-shaped handle 1-59 is 18mm × 16mm, and middle part screw 1-511 advises
Lattice are m12mm；At two footing of u-shaped handle 1-59, cross dimensions is 11mm × 16mm, coaxial line axis hole a size of φ 10mm.
As shown in figure 3, cylinder build-in test coil 2 is distributed with the disc carrier 2- supporting test solenoid coil 2-1 from outside to inside
2nd, the protection sleeve pipe 2-7 of protection test solenoid coil 2-1, test solenoid coil 2-1, winding test solenoid coil 2-1
Pipe 2-6；Positioned at pipe 2-6 in the hole for placing the testing tube 2-4 of test solenoid coil 2-1 and being used for supporting test
The pipe holder 2-5 of pipe 2-4；The length of testing tube 2-4 is more than the length of test solenoid coil 2-1.
In the present embodiment, test solenoid coil 2-1 yardstick is: long 1240mm, diameter phi 64mm；Disc carrier 2-2 is by 3
The disk composition of individual engineering plastic materials, disk is thick to be 20mm, and disc centre bore dia is φ 71mm, circumferentially 3, side fixation
A diameter of φ 12mm in hole；3 screw rod 2-3 of fixed disc and nut thereon are all the engineering plastics materials that specification is m12mm
The securing member of material；Testing tube 2-4 yardstick is: long 1390mm, internal diameter φ 30mm, wall thickness 5mm；Pipe 2-6 yardstick is: long
1280mm, external diameter φ 62mm, wall thickness 5mm；Protection sleeve pipe 2-7 yardstick is: long 1300mm, internal diameter φ 65mm, external diameter φ 70mm.
First order port lid 1-51 is mainly used in being convenient for changing test solenoid coil 2-1 and protection sleeve pipe 2-7；Use glass silicon
Disc carrier 2-2 is integrally attached on the appropriate location of thick-wall metal pipes 1-3 internal face the bonding agent of glue type；Open the first order
Port lid 1-51, by protect sleeve pipe 2-7 slides in the centre bore of disc carrier 2-2 to be placed or taken out solenoid coil 2-1 with
Protection sleeve pipe 2-7.Second level port lid 1-55 is mainly used in being placed or taken out bar-shaped coil to be tested, so that quickly and easily
Carry out the filler test work of the coil of big quantity, thus reduce filler test working strength, improve work efficiency.Low in needs
When the test environment of interference more effectively stops extraneous leakage interference, can increase on the more second level port lid 1-55 of hole
One layer of shielding, by the knob 1-510 in the middle part of u-shaped handle 1-59, screening cover 1-57 is pressed in the second cannelure 1-54.
Below the annexation of whole device is further detailed:
First order port lid 1-51 is used for directly blocking through hole 1-21, and first order port lid top 1-52 is with diameter greater than through hole 1-21
Diameter more than 1/3.First order port lid 1-51 is all to become t shape by its structure along the section of central axis with second level port lid 1-55
The not isometrical cylinder of coaxial line is constituted, and is fastened by the rectangle buckle in the small-diameter circular cylinder section directly blocking in perforate, tightly
Solid rectangle buckle be no less than 2 circle.
Test solenoid coil 2-1 and testing tube 2-4 all with thick-wall metal pipes 1-3 coaxial line；Test solenoid coil 2-1
All it is less than 1mm with testing tube 2-4 with thick-wall metal pipes 1-3 axiality.
Test solenoid coil 2-1 body end and first end cap 1-1 and second end cap 1-2 inwall between spacing not
Less than the 1/2 of test solenoid coil 2-1 body diameter, in this example, test a diameter of φ of solenoid coil 2-1 body
64mm, between test solenoid coil 2-1 end and first end cap 1-1 and second end cap 1-2 inwall, spacing is 35mm；
Testing tube 2-4 opening is close to the first port lid through hole 1-53；First order port lid through hole 1-53 is with diameter greater than test solenoid coil
The external diameter of 2-1, both differences are not less than 10 millimeters；The external diameter with diameter greater than protection sleeve pipe 2-7 for the first order port lid through hole 1-53, two
The difference of person is not less than 5 millimeters.
Additionally, as shown in figure 1, assembly of the invention also includes a pier shape tube stent 3, comprising: cylinder 3-1, ground connection
Stake 3-2, in this example, cylinder 3-1 body a diameter of φ 320mm, total height is 220mm, cylinder 3-1 top arc face
Radian is r140mm, arc surface vertical dimension is 90mm；Pier shape tube stent 3 is located at the middle part outer wall of thick-wall metal pipes 1-3, cylinder
The arc surface at body 3-1 top is supported on thick-wall metal pipes 1-3.
Claims (7)
1. a kind of extremely low frequency wave shield test device, this device includes: wave shield cylinder (1) and cylinder build-in test coil (2), institute
State a build-in test coil (2) to be located in described wave shield cylinder (1)；
Described wave shield cylinder (1) includes: first end cap (1-1), second end cap (1-2), thick-wall metal pipes (1-3), spiral shell
Bar (1-4), dual port lid (1-5) and screening cover (1-57)；Described first end cap (1-1) and described second end cap (1-2)
Two ends positioned at described thick-wall metal pipes (1-3)；Described dual port lid (1-5) closes described second end cap (1-2), described screen
Cover lid (1-57) for cover closing described dual port lid (1-5)；By described first end cap (1-1), described thick-wall metal pipes
(1-3) it is integrally fixed by described screw rod (1-4) with described second end cap (1-2), form the test of extremely low frequency wave shield
The shielding cavity body part of device；
Described cylinder build-in test coil (2) is distributed with disc carrier (2-2), the position supporting test solenoid coil (2-1) from outside to inside
Protection sleeve pipe (2-7) outside test solenoid coil (2-1), test solenoid coil (2-1), the described test helical of winding
The pipe (2-6) of pipeline circle (2-1)；It is used for supporting the pipe holder (2-5) of testing tube (2-4) positioned at described pipe (2-6) in the hole
With testing tube (2-4)；The length of described testing tube (2-4) is more than the length of described test solenoid coil (2-1).
2. extremely low frequency wave shield test device according to claim 1 is it is characterised in that described first end cap (1-
1) it is provided with round basin connected in star (1-11), annular groove (1-12) and screw (1-13) from inside to outside along central axis；Described second
Cylinder end cap (1-2) is provided with through hole (1-21), first annular groove (1-22) and hole (1-23) from inside to outside；Described annular groove (1-
12) yardstick and shape are determined by the end geometry of described thick-wall metal pipes (1-3), described annular groove (1-12) recessed
Groove depth is not less than the 1/2 of described thick-wall metal pipes (1-3) wall thickness dimension.
3. extremely low frequency wave shield test device according to claim 2 is it is characterised in that described dual port lid (1-5)
Including: first order port lid (1-51) and second level port lid (1-55)；First order hole is offered on described first order port lid (1-51)
Lid through hole (1-53), first order port lid top (1-52) is provided around the second cannelure (1- of first order port lid through hole (1-53)
54)；Described second level port lid (1-55) is provided with signal string holes (1-56).
4. extremely low frequency wave shield test device according to claim 3 is it is characterised in that described screening cover (1-57)
Fairlead (1-58) is had on the wall of side；Described first order port lid top (1-52) is provided with u-shaped handle (1-59), described u-shaped handss
It is provided with knob (1-510) and middle part screw (1-511), described knob (1-510) is used for compressing described shielding in the middle part of handle (1-59)
Lid (1-57).
5. extremely low frequency wave shield test device according to claim 4 is it is characterised in that described second level port lid (1-
55) it is used for closing described first order port lid through hole (1-53), described screening cover (1-57) is used for covering closing described second level hole
Lid (1-55)；It is provided with the axis hole of coaxial line, described first order port lid top (1-52) at two footing of described u-shaped handle (1-59)
For cylinder, its side wall radially opens up two screws, this two screw coaxial lines, the line of centres of two screws and described the
One-level port lid (1-51) central axis upright intersects, and this two screws run through described u-shaped handle (1-59) two footing for installing
The fixing bolt (1-512) of place's axis hole, described first order port lid top (1-52) opens up vertically for described second level port lid (1-
55) through hole penetrating.
6. extremely low frequency wave shield test device according to claim 3 is it is characterised in that described first order port lid (1-
51) it is used for directly blocking described through hole (1-21), described first order port lid top (1-52) is with diameter greater than described through hole (1-21)
The 1/3 of diameter, described first order port lid (1-51) and described second level port lid (1-55) are all along central axis by its structure
Section becomes the not isometrical cylinder of the coaxial line of t shape to constitute, by the rectangle spiral shell in the small-diameter circular cylinder section directly blocking in perforate
Screw thread fastens.
7. extremely low frequency wave shield test device according to claim 3 is it is characterised in that described test solenoid coil
(2-1) between body end and described first end cap (1-1) and described second end cap (1-2) inwall spacing be not less than described
The 1/2 of test solenoid coil (2-1) body diameter；Described first order port lid through hole (1-53) is with diameter greater than described protection sleeve pipe
(2-7) external diameter.
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| CN201410465527.1A CN104198975B (en) | 2014-09-12 | 2014-09-12 | Extremely-low-frequency radio wave shielding test device |
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| CN201410465527.1A CN104198975B (en) | 2014-09-12 | 2014-09-12 | Extremely-low-frequency radio wave shielding test device |
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| CN104198975B true CN104198975B (en) | 2017-01-25 |
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| CN104866661B (en) * | 2015-05-14 | 2018-02-09 | 清华大学 | Very low frequencies signal detection and velocity estimation apparatus based on three fork decision trees |
| CN109597010A (en) * | 2018-12-04 | 2019-04-09 | 北京昆迈生物医学研究院有限公司 | A kind of high-performance magnetism screening arrangement and method based on Active Compensation |
| CN109658536A (en) * | 2018-12-19 | 2019-04-19 | 云教（北京）科技有限公司 | A kind of system that uninterrupted attendance is realized based on RFID technique |
| CN112748377B (en) * | 2020-12-16 | 2022-08-09 | 中国船舶重工集团有限公司第七一0研究所 | Satellite-borne induction type magnetometer field calibration device |
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| JPH05145271A (en) * | 1991-11-25 | 1993-06-11 | Bando Chem Ind Ltd | Cylindrical apparatus for shielding electromagnetic wave |
| CN2874722Y (en) * | 2005-09-23 | 2007-02-28 | 宝钢集团上海五钢有限公司 | Super low frequency electromagnet shielding device of multilay composite structure |
| CN101245925A (en) * | 2008-03-21 | 2008-08-20 | 美的集团有限公司 | Shielding structure of microwave electromagnetic field cavity opening aperture |
| CN201248228Y (en) * | 2008-05-19 | 2009-05-27 | 北京京地磁应用研究所 | Shielded chamber for restraining low frequency magnetic field interference of magnetostatic field |
| CN103472271B (en) * | 2012-06-08 | 2016-05-18 | 中国科学院空间科学与应用研究中心 | A kind of low-frequency band magnetic shielding cylinder |
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