CN202975210U - Shielding effectiveness test device for low-frequency magnetic field - Google Patents
Shielding effectiveness test device for low-frequency magnetic field Download PDFInfo
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- CN202975210U CN202975210U CN 201220702629 CN201220702629U CN202975210U CN 202975210 U CN202975210 U CN 202975210U CN 201220702629 CN201220702629 CN 201220702629 CN 201220702629 U CN201220702629 U CN 201220702629U CN 202975210 U CN202975210 U CN 202975210U
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Abstract
The utility model discloses a shielding effectiveness test device for a low-frequency magnetic field, comprising a voltage-stabilized power supply capable of providing a voltage of 110-220 V, a low-frequency signal generator capable of generating an electromagnetic signal of 5-30 MHz, a magnetic field generator, a tester and a magnetic shielding box, wherein the voltage-stabilized power supply can be used for generating a constant current and outputting the constant current to the low-frequency signal generator; the low-frequency signal generator is used for generating a low-frequency signal and outputting the low-frequency signal to the magnetic field generator; the magnetic field generator is placed in the magnetic shielding box and used for generating a balanced low-frequency magnetic field; and a small window is formed in one surface of the magnetic shielding box, and thus the shielding effectiveness test device for a low-frequency magnetic field is obtained. The utility model provides a shielding effectiveness test device for a low-frequency magnetic field, which can be used for performing a shielding effectiveness test on various low-frequency magnetic shielding materials, and then effectively evaluating the various low-frequency magnetic shielding materials, and guiding research, development and production for the low-frequency magnetic shielding materials.
Description
Technical field
The utility model relates to a kind of electromagnetic shielding performance testing device, particularly a kind of low frequency magnetic field shield effectiveness proving installation.
Background technology
Along with improving constantly of electronic technology and infotech, the various impalpable electromagnetic signals of cannot see have been full of in people's living environment, they are bringing us the various whiles easily, brought a lot of negative impacts also inevitably for our work and life, wherein the harm of low frequency magnetic field is especially remarkable.such as the power transmission line in our daily life, the converter of steel plant and many household electrical appliance and electronic devices and components all can produce low frequency magnetic field, these low frequency magnetic fields can cause interference to machinery and equipment on the one hand, affect the normal operation program of instrument, also can bring adverse influence to the health of human body on the other hand, so the step that people research and develop the shielding material of low frequency magnetic field never stopped, but up to the present, not preparing effective low-frequency magnetic shielding proving installation measures accurately and assesses the magnetic shielding material shield effectiveness of research and development.
The utility model content
In view of this, the purpose of this utility model is to provide a kind of low frequency magnetic field shield effectiveness proving installation, can carry out the shield effectiveness test to various low-frequency magnetic shielding materials, thereby it is made effective assessment, instructs research and development and the production of low-frequency magnetic shielding material.
The purpose of this utility model is achieved through the following technical solutions: low frequency magnetic field shield effectiveness proving installation, comprise stabilized voltage supply, low frequency generator, magnetic field generator, measuring instrument and magnetic shielding case, described stabilized voltage supply can produce constant electric current, export low frequency generator to, described low frequency generator is for generation of low frequency signal, export magnetic field generator to, described magnetic field generator is positioned in the magnetic shielding case, for generation of the low frequency magnetic field of equilibrium.
Further, described magnetic shielding case is the rectangular parallelepiped with magnetic field shielding usefulness.
Further, have a wicket on the one side of described magnetic shielding case.
Further, described wicket is shaped as quadrilateral or triangle or circle or polygon.
Further, described wicket is quadrilateral, and each length of side of wicket is 10cm-15cm.
Further, described measuring instrument is over against wicket.
Further, the 1cm-5cm place, edge, both sides of described wicket is provided with respectively the baffle plate of same material preparation, baffle plate is vertically fixed on the magnetic shielding case and the baffle plate top is 1cm-5cm apart from the vertical height of shielded box outside surface, at the two ends of baffle plate, a clamp nut is arranged respectively.
Further, the both sides of described wicket are opposite side.
Further, described magnetic field generator is helmholtz coil generator or solenoid generator.
The beneficial effects of the utility model are:
1. a kind of low frequency magnetic field shield effectiveness of the utility model proving installation, can carry out the shield effectiveness test to various low-frequency magnetic shielding materials, thereby the shielding properties of material is made effective assessment, instructs research and development and the production of magnetic shielding material.
2. apparatus structure of the present utility model is simple, easy operating.
Other advantages of the present utility model, target and feature will be set forth to a certain extent in the following description, and to a certain extent, based on being apparent to those skilled in the art to investigating hereinafter, perhaps can be instructed from practice of the present utility model.Target of the present utility model and other advantages can realize and obtain by following instructions.
Description of drawings
In order to make the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with accompanying drawing, the utility model is described in further detail, wherein:
Fig. 1 is the schematic diagram of a kind of low frequency magnetic field shield effectiveness of the utility model proving installation;
Embodiment
Hereinafter with reference to accompanying drawing, preferred embodiment of the present utility model is described in detail.Should be appreciated that preferred embodiment only for the utility model is described, rather than in order to limit protection domain of the present utility model.
As shown in Figure 1, low frequency magnetic field shield effectiveness proving installation comprises the stabilized voltage supply that 110V-220V voltage can be provided, the low frequency generator that can produce 5-30MHz electromagnetic signal, magnetic field generator, measuring instrument and magnetic shielding case.Stabilized voltage supply provides constant power supply to low-frequency signal emitter, low-frequency signal emitter produces stable low frequency signal and is input in magnetic field generator, magnetic field generator will produce constant low frequency magnetic field, because being in, magnetic field generator only have one side to have in the magnetic shielding casing of a wicket, therefore this low frequency magnetic field can only leak from this wicket, and measuring instrument is measured the magnetic induction density that wicket leaks.The shape of wicket can be the various shapes such as circle, square and triangle, and the utility model adopts square.
Be provided with respectively the baffle plate of same material preparation apart from each 1cm of upper lower limb of wicket-5cm place at the shielded box outside surface, baffle plate vertically is fixed on the shielded box outside surface and the baffle plate top is 1cm-5cm apart from the vertical height of shielded box outside surface, at two of baffle plate, a clamp nut is arranged respectively.
Can change according to the actual requirements baffle plate to the distance of little window edge, also can change according to the actual needs the size on each limit of wicket, the present embodiment adopts 10cm-15cm.
When carrying out the test of low frequency magnetic field shield effectiveness, at first measuring instrument is placed on the outside of magnetic shielding case wicket, the magnetic induction density when obtaining there is no the shielding material sealing is designated as H
0, and then shielding material is prepared into length and width is of a size of 10.5 ± 0.4cm, thickness is placed between the wicket of baffle plate and magnetic shielding case less than the sample of 1cm, tightens the nut on baffle plate, and shielding material is sealed the wicket of magnetic shielding case fully.Also can change according to the actual requirements the size of sample.
Under identical Parameter Conditions, surveying instrument is placed on the identical position, outside of shielded box wicket again, the magnetic induction density after being shielded is designated as H
1At last, according to formula, can obtain the low frequency magnetic field shield effectiveness value of this shielding material.
Explanation is at last, above embodiment is only unrestricted in order to the technical solution of the utility model to be described, although with reference to preferred embodiment, the utility model is had been described in detail, those of ordinary skill in the art is to be understood that, can modify or be equal to replacement the technical solution of the utility model, and not breaking away from aim and the scope of the technical program, it all should be encompassed in the middle of claim scope of the present utility model.
Claims (9)
1. low frequency magnetic field shield effectiveness proving installation, it is characterized in that: comprise stabilized voltage supply, low frequency generator, magnetic field generator, measuring instrument and magnetic shielding case, described stabilized voltage supply can produce constant electric current, export low frequency generator to, described low frequency generator is for generation of low frequency signal, export magnetic field generator to, described magnetic field generator is positioned in the magnetic shielding case, for generation of the low frequency magnetic field of equilibrium.
2. low frequency magnetic field shield effectiveness proving installation according to claim 1, it is characterized in that: described magnetic shielding case is the rectangular parallelepiped with magnetic field shielding usefulness.
3. low frequency magnetic field shield effectiveness proving installation according to claim 1, is characterized in that: have a wicket on the one side of described magnetic shielding case.
4. low frequency magnetic field shield effectiveness proving installation according to claim 3 is characterized in that: described wicket be shaped as quadrilateral or triangle or circle or polygon.
5. low frequency magnetic field shield effectiveness proving installation according to claim 4, it is characterized in that: described wicket is quadrilateral, each length of side of wicket is 10cm-15cm.
6. low frequency magnetic field shield effectiveness proving installation according to claim 1, it is characterized in that: described measuring instrument is over against wicket.
7. low frequency magnetic field shield effectiveness proving installation according to claim 4, it is characterized in that: the 1cm-5cm place, edge, both sides of described wicket is provided with respectively the baffle plate of same material preparation, baffle plate is vertically fixed on the magnetic shielding case and the baffle plate top is 1cm-5cm apart from the vertical height of shielded box outside surface, at the two ends of baffle plate, a clamp nut is arranged respectively.
8. low frequency magnetic field shield effectiveness proving installation according to claim 4, it is characterized in that: the both sides of described wicket are opposite side.
9. low frequency magnetic field shield effectiveness proving installation according to claim 1, it is characterized in that: described magnetic field generator is helmholtz coil generator or solenoid generator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220702629 CN202975210U (en) | 2012-12-18 | 2012-12-18 | Shielding effectiveness test device for low-frequency magnetic field |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220702629 CN202975210U (en) | 2012-12-18 | 2012-12-18 | Shielding effectiveness test device for low-frequency magnetic field |
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| Publication Number | Publication Date |
|---|---|
| CN202975210U true CN202975210U (en) | 2013-06-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220702629 Expired - Lifetime CN202975210U (en) | 2012-12-18 | 2012-12-18 | Shielding effectiveness test device for low-frequency magnetic field |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103760438A (en) * | 2014-01-08 | 2014-04-30 | 宋晓蕾 | Testing device and testing method for shielding effectiveness of low-frequency magnetic shielding fabric |
| CN107003369A (en) * | 2014-09-19 | 2017-08-01 | 德国尤里希研究中心 | Device and method for measuring the light current magnetic signal from sample at low frequencies |
| CN108802544A (en) * | 2018-08-20 | 2018-11-13 | 中国工程物理研究院应用电子学研究所 | A kind of flexible adjustable electromagnetic shielding performance testing device of test window size |
| CN109116124A (en) * | 2018-08-20 | 2019-01-01 | 中国工程物理研究院应用电子学研究所 | A kind of movable type multi output electromagnetic shielding performance testing device |
| CN109239469A (en) * | 2018-08-16 | 2019-01-18 | 江苏赛诺格兰医疗科技有限公司 | The device and method for detecting magnetic shielding material Magnetic Shielding Effectiveness under downfield |
| CN109406899A (en) * | 2018-11-12 | 2019-03-01 | 中国科学院长春光学精密机械与物理研究所 | Active light transmission shielding membrane shield effect test method, apparatus and system |
-
2012
- 2012-12-18 CN CN 201220702629 patent/CN202975210U/en not_active Expired - Lifetime
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103760438A (en) * | 2014-01-08 | 2014-04-30 | 宋晓蕾 | Testing device and testing method for shielding effectiveness of low-frequency magnetic shielding fabric |
| CN107003369A (en) * | 2014-09-19 | 2017-08-01 | 德国尤里希研究中心 | Device and method for measuring the light current magnetic signal from sample at low frequencies |
| CN109239469A (en) * | 2018-08-16 | 2019-01-18 | 江苏赛诺格兰医疗科技有限公司 | The device and method for detecting magnetic shielding material Magnetic Shielding Effectiveness under downfield |
| CN109239469B (en) * | 2018-08-16 | 2021-11-02 | 江苏赛诺格兰医疗科技有限公司 | Device and method for detecting magnetic shielding effect of magnetic shielding material under low magnetic field |
| CN108802544A (en) * | 2018-08-20 | 2018-11-13 | 中国工程物理研究院应用电子学研究所 | A kind of flexible adjustable electromagnetic shielding performance testing device of test window size |
| CN109116124A (en) * | 2018-08-20 | 2019-01-01 | 中国工程物理研究院应用电子学研究所 | A kind of movable type multi output electromagnetic shielding performance testing device |
| CN109116124B (en) * | 2018-08-20 | 2020-09-25 | 中国工程物理研究院应用电子学研究所 | Movable multi-output electromagnetic shielding effectiveness testing device |
| CN109406899A (en) * | 2018-11-12 | 2019-03-01 | 中国科学院长春光学精密机械与物理研究所 | Active light transmission shielding membrane shield effect test method, apparatus and system |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130605 |
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| CX01 | Expiry of patent term |