CN114019251A - Magnetic shielding detector - Google Patents
Magnetic shielding detector Download PDFInfo
- Publication number
- CN114019251A CN114019251A CN202111295990.2A CN202111295990A CN114019251A CN 114019251 A CN114019251 A CN 114019251A CN 202111295990 A CN202111295990 A CN 202111295990A CN 114019251 A CN114019251 A CN 114019251A
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- light emitting
- emitting diode
- transmitting antenna
- signal
- shielding box
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- 238000001514 detection method Methods 0.000 description 3
- 238000005286 illumination Methods 0.000 description 2
- 238000000691 measurement method Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000011897 real-time detection Methods 0.000 description 1
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- 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
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- 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
- G01R29/0864—Measuring electromagnetic field characteristics characterised by constructional or functional features
- G01R29/0871—Complete apparatus or systems; circuits, e.g. receivers or amplifiers
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
Abstract
The invention discloses a magnetic shielding detector, which comprises: the device comprises a shielding box body, a signal detector, a signal generator and a transmitting antenna, wherein a tested piece and the signal detector are arranged in the shielding box body, the signal generator is arranged outside the shielding box body, the transmitting antenna penetrates through the tested piece and then is connected with the signal generator through a coaxial cable, and the signal detector is used for acquiring a signal transmitted by the transmitting antenna. The transmitting antenna is arranged in the detected piece, the transmitting antenna is connected with the signal generator by the coaxial cable, and the signal detector detects the electromagnetic signal sent by the transmitting antenna in the detected piece, so that the magnetic shielding performance of the detected piece is directly detected.
Description
Technical Field
The invention relates to the field of industrial electromagnetic detection, in particular to a magnetic shielding detector.
Background
At present, electronic devices are more and more miniaturized, the anti-interference performance of the electronic devices is more and more applied, and no device can be used for directly detecting the magnetic shielding performance of small pieces. Because the internal space of the small electronic device is very small, various sensors cannot be placed, and therefore the shielding effect of the small electronic device cannot be directly detected. The magnetic shielding detection method can only measure parameters by using a contrast measurement method or an indirect measurement method, and then the parameters are obtained by calculation.
Disclosure of Invention
The invention provides a magnetic shielding detector which is used for solving the technical problem that the magnetic shielding performance of the conventional small electronic device cannot be directly detected.
In order to achieve the above object, the present invention provides a magnetic shield detecting instrument, comprising: the device comprises a shielding box body, a signal detector, a signal generator and a transmitting antenna, wherein a tested piece and the signal detector are arranged in the shielding box body, the signal generator is arranged outside the shielding box body, the transmitting antenna penetrates through the tested piece and then is connected with the signal generator through a coaxial cable, and the signal detector is used for acquiring a signal transmitted by the transmitting antenna.
Furthermore, the device also comprises a bracket, wherein the bracket is provided with a limiting device for limiting the movement of the measured piece, and the limiting device is used for limiting the movement of the measured piece.
Furthermore, the light-emitting device penetrates through and is fixed on the side wall of the shielding box body, the light-emitting device is used for illuminating the inside of the shielding box body, and the light-emitting device is electrically connected with the battery.
Further, the light emitting device is specifically a plurality of light emitting diodes connected in series and/or in parallel.
Further, the light emitting device specifically includes a first light emitting diode, a second light emitting diode, a third light emitting diode, and a fourth light emitting diode, a negative electrode of the first light emitting diode and a negative electrode of the third light emitting diode are connected to a negative electrode of the battery, a positive electrode of the first light emitting diode is connected to a negative electrode of the second light emitting diode, a positive electrode of the third light emitting diode is connected to a negative electrode of the fourth light emitting diode, and a positive electrode of the second light emitting diode and a positive electrode of the fourth light emitting diode are connected to a positive electrode of the battery.
Furthermore, the tested part comprises an upper shell and a lower shell which can be separated, a small wire passing hole is formed in the lower shell, and the connecting end of the transmitting antenna penetrates through the small wire passing hole of the tested part and is connected with the coaxial cable.
Furthermore, the shielding box further comprises a camera, and the camera penetrates through and is fixed on the side wall of the shielding box body.
The invention has the following beneficial effects:
according to the magnetic shielding detector, the detected piece, the transmitting antenna and the signal detector are arranged inside the shielding box body, the signal generator is arranged outside the shielding box body, so that external electromagnetic interference can be avoided, the transmitting antenna is arranged inside the detected piece, the transmitting antenna is connected with the signal generator through the coaxial cable, and the signal detector detects an electromagnetic signal sent by the transmitting antenna inside the detected piece, so that the magnetic shielding performance of the detected piece is directly detected.
In addition to the objects, features and advantages described above, other objects, features and advantages of the present invention are also provided. The present invention will be described in further detail below with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
fig. 1 is a schematic structural view of a magnetic shielding detector of the present invention.
Fig. 2 is a sectional view of a central axis of a bracket of the magnetic shielding detector of the invention.
Wherein the reference numbers are as follows: 1. a shielding box cover; 2. a shielding box body; 3. a measured piece; 4. a signal detector; 5. a support; 6. a light emitting diode; 7. a coaxial cable; 8. a camera; 9. a wire; 10. a signal generator; 11. a battery; 12. a power plug; 13. and a transmitting antenna.
Detailed Description
The embodiments of the invention will be described in detail below with reference to the drawings, but the invention can be implemented in many different ways as defined and covered by the claims.
As shown in fig. 1 and fig. 2, a magnetic shield detecting apparatus of the present embodiment includes: the device comprises a shielding box body 2, a signal detector 4, a signal generator 10 and a transmitting antenna 13 used for placing a tested piece 3, wherein the tested piece 3 and the signal detector 4 are arranged in the shielding box body 2, the signal generator 10 is arranged outside the shielding box body 2, and the transmitting antenna 13 penetrates through the tested piece 3 and is connected with the signal generator 10 through a coaxial cable 7.
For a small measured piece 3 with magnetic shielding requirements, the volume of the small measured piece 3 is usually smaller than that of a sensor for detection, so that the sensor cannot be placed in the measured piece, the magnetic shielding material has no directivity, the transmitting antenna 13 is tiny, the transmitting antenna 13 is arranged in the measured piece 3, and the sensor and reading equipment are placed outside the measured piece 3, so that the magnetic shielding performance of the measured piece 3 can be directly detected.
The tested piece 3 is usually a shell composed of two separable parts, and specifically comprises an upper shell and a lower shell which are separable, wherein a line passing small hole is formed in the lower shell, an insulated transmitting antenna 13 is arranged in the tested piece 3, the connecting end of the transmitting antenna 13 penetrates through the line passing small hole of the tested piece and is connected with one end of a coaxial cable 7, the other end of the coaxial cable 7 is connected with a signal generator 10, the signal generator 10 is connected with a mains supply through a power plug 12, and the signal generator 10 generates an electromagnetic signal through electrification to be sent to the inside of the tested piece 3 through the coaxial cable 7.
In the shielded box 2 was located to piece 3, transmitting antenna 13 and signal detector 4 to be surveyed, signal generator 10 located outside shielded box 2, shielded box 2 still was equipped with and is used for getting the shielding case lid 1 of putting piece 3 to be surveyed, when carrying out magnetic screen performance and detecting, closed shielding case lid 1, can completely cut off outside electromagnetic signal's interference through shielded box 2, the environment of guaranteeing in the box does not have electromagnetic pollution, it is true effective effectively to ensure test data
In the embodiment, the device further comprises a support 5, a limiting device for limiting the movement of the measured part 3 is arranged on the support 5 and used for limiting the movement of the measured part 3, and the middle part of the limiting device of the support 5 is hollow and used for connecting the transmitting antenna 13 with the coaxial cable 7.
Specifically, stop device on support 5 is a recess the same with 3 cross sectional shapes of measured, will be measured 3 and locate the recess in can restrict the lateral displacement of being measured 3 when testing, run through the central authorities of recess, when transmitting antenna 13 spreads out from the line aperture of crossing of being measured 3, can be at the hollow position lug connection coaxial cable 7 of support 5, furthest avoids electromagnetic signal's revealing.
In this embodiment, still include illuminator and battery 11, illuminator runs through and is fixed in on the lateral wall of shielding box 2, makes the light-emitting part be located inside shielding box 2, and the connection position is located the shielding box outside for shielding box 2 internal illumination, illuminator electricity connection battery 11, illuminator can be for arbitrary can be when carrying out the magnetic screen and detect the device that provides the illumination in for shielding box 2, for example: the light emitting device of the present embodiment is specifically a plurality of light emitting diodes 6 connected in series and/or in parallel, and the light emitting diodes 6 are connected through a wire 9.
Specifically, in this embodiment, the light emitting device includes four light emitting diodes 6, specifically, a first light emitting diode, a second light emitting diode, a third light emitting diode and a fourth light emitting diode, a cathode of the first light emitting diode and a cathode of the third light emitting diode are connected to a cathode of the battery 11, an anode of the first light emitting diode is connected to a cathode of the second light emitting diode, an anode of the third light emitting diode is connected to a cathode of the fourth light emitting diode, an anode of the second light emitting diode and an anode of the fourth light emitting diode are connected to an anode of the battery 11, and the four light emitting diodes 6 are used to illuminate the inside of the box after being powered on, so as to facilitate observation.
In this embodiment, still include camera 8, camera 8 runs through and is fixed in on the lateral wall of shielding box 2, and the position of making a video recording of camera 8 is located inside shielding box 2, and the connection position is located the shielding box outside, and camera 8 can detect through long-range magnetic screen performance of watching, the real-time condition in the shielding box can also be preserved the magnetic screen performance and detect the condition in the overall process shielding box.
The working principle of the embodiment is as follows: install transmitting antenna 13 in the inside of being surveyed piece 3, connect signal generator 10 through coaxial cable 7, after the magnetic shielding performance detects, signal generator 10 circular telegram produces electromagnetic signal, and carry to transmitting antenna 13, signal detector 4 real-time detection electromagnetic signal in the shield box 2, when signal detector 4 does not detect electromagnetic signal, or when detected electromagnetic signal is less than predetermined threshold value, then the magnetic shielding performance of being surveyed piece 3 is good, when signal detector 4 detects the electromagnetic signal that exceeds the threshold value, then the magnetic shielding performance of being surveyed piece 3 is relatively poor.
According to the magnetic shielding detector, the detected piece 3, the transmitting antenna 13 and the signal detector 4 are arranged inside the shielding box body 2, the signal generator 10 is arranged outside the shielding box body 2, so that the interference of external electromagnetism on the detected piece 3 can be avoided, the transmitting antenna 13 is arranged inside the detected piece 3, the transmitting antenna 13 is connected with the signal generator 10 through the coaxial cable 7, and the signal detector 4 detects an electromagnetic signal sent by the transmitting antenna 13 inside the detected piece 3, so that the magnetic shielding performance of the detected piece 3 can be directly detected.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. A magnetic shield detector, comprising: shielding box (2), signal detector (4), signal generator (10) and transmitting antenna (13), measured piece (3) with signal detector (4) are located in shielding box (2), signal generator (10) are located outside shielding box (2), transmitting antenna (13) run through and are connected through coaxial cable (7) behind measured piece (3) signal generator (10), signal detector (4) are used for acquireing the signal that transmitting antenna (13) sent.
2. Magnetic shield detector according to claim 1, characterized in that it further comprises a support (5), said support (5) being provided with a limiting device for limiting the movement of said measured member (3).
3. Magnetic shield detector according to claim 1, characterized in that it further comprises a light emitting device and a battery (11), said light emitting device being fixed through and on the side wall of said shielding box (2) for illuminating the interior of said shielding box (2), said light emitting device being electrically connected to said battery (11).
4. Magnetic shield detector according to claim 3, characterized in that said light-emitting means are embodied as a plurality of series and/or parallel connected light-emitting diodes (6).
5. A magnetic shielding detector according to claim 4, characterized in that said light emitting means comprises a first light emitting diode, a second light emitting diode, a third light emitting diode and a fourth light emitting diode, wherein the cathode of said first light emitting diode and the cathode of said third light emitting diode are connected to the cathode of said battery (11), the anode of said first light emitting diode is connected to the cathode of said second light emitting diode, the anode of said third light emitting diode is connected to the cathode of said fourth light emitting diode, and the anode of said second light emitting diode and the anode of said fourth light emitting diode are connected to the anode of said battery (11).
6. The magnetic shielding detector according to claim 1, wherein the tested member (3) comprises an upper shell and a lower shell which are separable, the lower shell is provided with a small through hole, and the connecting end of the transmitting antenna (13) passes through the small through hole of the tested member (3) and is connected with the coaxial cable (7).
7. Magnetic shield detector according to claim 1, characterized in that it further comprises a camera (8), said camera (8) being fixed through and to the side wall of said shielding box (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111295990.2A CN114019251A (en) | 2021-11-03 | 2021-11-03 | Magnetic shielding detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111295990.2A CN114019251A (en) | 2021-11-03 | 2021-11-03 | Magnetic shielding detector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114019251A true CN114019251A (en) | 2022-02-08 |
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ID=80060636
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111295990.2A Pending CN114019251A (en) | 2021-11-03 | 2021-11-03 | Magnetic shielding detector |
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| Country | Link |
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| CN (1) | CN114019251A (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101662078A (en) * | 2009-07-30 | 2010-03-03 | 北京大泽科技有限公司 | Small shielding body electromagnetic shielding performance testing device, system and method therefor |
| CN102944780A (en) * | 2012-11-06 | 2013-02-27 | 西安开容电子技术有限责任公司 | Testing method for shielding effectiveness of small-size shielding cavity |
| CN103884328A (en) * | 2014-03-27 | 2014-06-25 | 中国人民解放军军械工程学院 | Fiber-optic gyroscope magnetic shielding device |
| CN204007639U (en) * | 2014-08-15 | 2014-12-10 | 湖北航天技术研究院总体设计所 | A kind of optical fibre gyro ring body structurc |
| CN106940405A (en) * | 2017-03-24 | 2017-07-11 | 华北电力大学 | A kind of micro-wave screening takes shield effectiveness test system |
| US20170265339A1 (en) * | 2016-03-08 | 2017-09-14 | Samsung Electro-Mechanics Co., Ltd. | Shielded electronic device module and method of measuring shielding thereof |
| CN107589306A (en) * | 2016-07-07 | 2018-01-16 | 鸿富锦精密工业(武汉)有限公司 | Electronic equipment shielding performance testing device, system and method |
| CN208367106U (en) * | 2018-04-12 | 2019-01-11 | 石家庄铁路职业技术学院 | A kind of multipurpose assembly type electromagnetic shielding test box |
-
2021
- 2021-11-03 CN CN202111295990.2A patent/CN114019251A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101662078A (en) * | 2009-07-30 | 2010-03-03 | 北京大泽科技有限公司 | Small shielding body electromagnetic shielding performance testing device, system and method therefor |
| CN102944780A (en) * | 2012-11-06 | 2013-02-27 | 西安开容电子技术有限责任公司 | Testing method for shielding effectiveness of small-size shielding cavity |
| CN103884328A (en) * | 2014-03-27 | 2014-06-25 | 中国人民解放军军械工程学院 | Fiber-optic gyroscope magnetic shielding device |
| CN204007639U (en) * | 2014-08-15 | 2014-12-10 | 湖北航天技术研究院总体设计所 | A kind of optical fibre gyro ring body structurc |
| US20170265339A1 (en) * | 2016-03-08 | 2017-09-14 | Samsung Electro-Mechanics Co., Ltd. | Shielded electronic device module and method of measuring shielding thereof |
| CN107589306A (en) * | 2016-07-07 | 2018-01-16 | 鸿富锦精密工业(武汉)有限公司 | Electronic equipment shielding performance testing device, system and method |
| CN106940405A (en) * | 2017-03-24 | 2017-07-11 | 华北电力大学 | A kind of micro-wave screening takes shield effectiveness test system |
| CN208367106U (en) * | 2018-04-12 | 2019-01-11 | 石家庄铁路职业技术学院 | A kind of multipurpose assembly type electromagnetic shielding test box |
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