CN105827358B - A kind of apparatus and system for shield effectiveness detection - Google Patents
A kind of apparatus and system for shield effectiveness detection Download PDFInfo
- Publication number
- CN105827358B CN105827358B CN201610388713.9A CN201610388713A CN105827358B CN 105827358 B CN105827358 B CN 105827358B CN 201610388713 A CN201610388713 A CN 201610388713A CN 105827358 B CN105827358 B CN 105827358B
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- signal
- module
- amplifier
- antenna
- shield effectiveness
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04K—SECRET COMMUNICATION; JAMMING OF COMMUNICATION
- H04K3/00—Jamming of communication; Counter-measures
- H04K3/20—Countermeasures against jamming
- H04K3/22—Countermeasures against jamming including jamming detection and monitoring
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04K—SECRET COMMUNICATION; JAMMING OF COMMUNICATION
- H04K3/00—Jamming of communication; Counter-measures
- H04K3/20—Countermeasures against jamming
- H04K3/22—Countermeasures against jamming including jamming detection and monitoring
- H04K3/222—Countermeasures against jamming including jamming detection and monitoring wherein jamming detection includes detecting the absence or impossibility of intelligible communication on at least one channel
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04K—SECRET COMMUNICATION; JAMMING OF COMMUNICATION
- H04K3/00—Jamming of communication; Counter-measures
- H04K3/60—Jamming involving special techniques
- H04K3/68—Jamming involving special techniques using passive jamming, e.g. by shielding or reflection
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
Abstract
The present invention provides a kind of signal projectors for shield effectiveness detection, including signal source, signal amplification module, antenna and power supply, wherein the signal amplification module is second amplifying circuit；The present invention also provides a kind of shield effectiveness detection systems, including above-mentioned signal projector, further include signal receiver；Signal projector is used to generate the radiofrequency signal that detection needs, and emits, which is received, and will feed back to user after the signal processing after being tested the decaying of shield by signal receiver；For shield effectiveness detection system provided by the present invention for the electromagnetic interference in 1MHz-100MHz frequency range, 100dB or more can be reached by detecting dynamic range.
Description
Technical field
The present invention relates to electromagnetic shielding testing field, in particular to a kind of apparatus and system for shield effectiveness detection.
Background technique
Mr imaging technique is a kind of current application widely medical image diagnostic techniques, and basic principle: being by people
Body is placed in special magnetic field, with hydrogen nuclei in radio frequency pulse excitation human body, causes hydrogen nuclei to resonate, and absorb
Energy.After stopping radio-frequency pulse, hydrogen nuclei issues electric signal by specific frequency, and the energy of absorption is released,
It is included by external recipient, is handled through electronic computer and obtain image, therefore in order to which inspection result is accurate, nuclear magnetic resonance
Room is generally made of electromagnetic shielding material, for shielding extraneous electromagnetic interference.
And with the development of electronics technology technology, the sensitivity of the receiver of nuclear magnetic resonance check is higher and higher, this is just right
More stringent requirements are proposed for the shield effectiveness of nuclear magnetic resonance room.In nuclear magnetic resonance check, the interference signal mainly shielded is low
Frequency electromagnetic signal, and in the prior art, the signal strength one of low frequency electromagnetic signals shield effectiveness detection below for 100MHz
As only 60-70dB, this is not able to satisfy the higher and higher shield effectiveness test request of shielding material already, it is therefore desirable to a kind of survey
Measure the big low-frequency range electromagnetic signal shield effectiveness detection system of dynamic range.
Summary of the invention
It is an object of the invention to overcome the shortage of prior art, provide it is a kind of for shield effectiveness detection device and be
System.
In a first aspect, the present invention provides a kind of signal projector for shield effectiveness detection, including signal source, signal
Amplification module, power supply and antenna composition；
Wherein, the signal source, the signal amplification module and the antenna are sequentially connected, the power supply respectively with it is described
Signal source is connected with the signal amplification module, for powering to the signal source and the signal amplification module；
The signal amplification module includes the first amplifier and the second amplifier, and first amplifier is put with described second
Big device forms second amplifying circuit, and the signal source is connected with the input terminal of first amplifier, second amplifier
Output end is connected with the antenna.
In an embodiment of the present invention, the signal source is swept signal source or point-frequency signal source, the swept signal source
For generating the radiofrequency signal of a band frequency consecutive variations, the point-frequency signal source is used to generate the radiofrequency signal of specific frequency.
Second aspect, the present invention also provides a kind of systems for shield effectiveness detection, including first aspect present invention
The signal projector further includes signal receiver；
Wherein, the signal receiver includes antenna, preamplifier, signal processing module and power module, the day
Line, the preamplifier and the signal processing module are sequentially connected, and the power module is used for the preamplifier
And the signal processing module power supply,
The signal projector is used to receive penetrating for the signal projector transmitting for emitting radiofrequency signal, the antenna
Frequency signal, and the radiofrequency signal received is sent to the preamplifier, what the preamplifier was used to receive
Radiofrequency signal amplifies processing, and amplified radiofrequency signal is sent to the signal processing module, the signal processing
Module feeds back to user after being handled the radiofrequency signal received.
The preamplifier is by the enhanced processing to reception signal, to reach the survey for adjusting the signal receiver
The purpose for measuring dynamic range, enables the measurement dynamic range of the signal receiver to reach 100dB or more.
In an embodiment of the present invention, the signal processing module includes control module, analysis module and display module, institute
Control module is stated for controlling the operating mode and working condition of the analysis module and the display module, the analysis module
For being analyzed and processed to the radiofrequency signal received, and by treated, data are sent to the display module, described aobvious
Show data feedback of the module for sending analysis module to user.
In an embodiment of the present invention, the power module includes dismountable external power supply, the preamplifier and
Both the external power supply can be used to power for the signal processing module, and also the dismountable external power supply, meets institute using other
State the power supply unit power supply of signal processing module power reguirements.
Beneficial effects of the present invention: shield effectiveness detection system provided by the present invention is compact-sized, can satisfy difference
The shield test request of volume, and low frequency signal of the system for frequency between 1MHz-100MHz, measurement dynamic range
Up to 100dB or more, the requirement of the higher and higher shield effectiveness testing requirements of shielding material is met.And due to signal projector
Can be using Sweep Source as signal source, therefore the shielding of shield all frequency points in the entire frequency range of test request can be imitated
It can be carried out judgement, keep the shield effectiveness assessment result of tested shield more accurate.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of signal projector provided by the present invention；
Fig. 2 is the structural schematic diagram of shield effectiveness detection system provided by the present invention；
Fig. 3 is the structural schematic diagram of signal processing module of the invention.
Specific embodiment
With reference to the accompanying drawing and specific embodiment the present invention will be further described, illustrative examples therein and
Illustrate only to be used to explain the present invention, but not as a limitation of the invention.
As shown in Figure 1, showing for a kind of structure of signal projector 10 for shield effectiveness detection provided by the present invention
It is intended to, including signal source 11, the first amplifier 12, the second amplifier 13, power supply 14 and antenna 15.Wherein, signal source 11 with
The input terminal of first amplifier 12 is connected, and the output end of the first amplifier 12 is connected with the input terminal of the second amplifier 13, and second
The output end of amplifier 13 is connected with antenna 15, and power supply 14 is used to supply to signal source 11, the first amplifier 12, the second amplifier 13
Electricity；Signal source 11 is sent to the first amplifier 12 for generating radiofrequency signal, and by the radiofrequency signal of generation, and the signal is by the
After one amplifier 12 and the second amplifier 13 amplify twice, emitted by antenna 15.
The present invention also provides a kind of shield effectiveness detection systems, as shown in Fig. 2, include above-mentioned signal projector 10,
It further include signal receiver；Wherein, signal receiver includes antenna 20, preamplifier 30, signal processing module 40 and power supply
Module 50, antenna 20 are connected with the input terminal of preamplifier 30, the output end and signal processing module 40 of preamplifier 30
It is connected, power module 50 is used to power to preamplifier 30 and signal processing module 40.Signal projector 10 is for penetrating
Frequency signal, antenna 20 are used to receive the radiofrequency signal of the transmitting of signal projector 10, and before the radiofrequency signal received is sent to
Amplifier 30 is set, the radiofrequency signal received is amplified processing by preamplifier 30, and amplified radiofrequency signal is sent out
Signal processing module 40 is given, signal processing module 40 feeds back to user after being handled the radiofrequency signal received.
Wherein signal processing module 40, as shown in figure 3, including analysis module 41, display module 42 and control module 43,
In, the input terminal of analysis module 41 is connected with the output end of preamplifier 30, the output end and display module of analysis module 41
42 input terminal is connected, and control module 43 is used to control the working method and working condition of analysis module 41 and display module 42；
After the radiofrequency signal received is analyzed and processed by analysis module 41, analysis result is sent to display module 42, shows mould
Block 42 feeds back to user for result is analyzed.
In an embodiment of the present invention, signal processing module 40 is spectrum analyzer, and signal source 11 is swept signal source, electricity
Source module 50 is outside lithium battery, and the lithium battery power supply had both can be used in preamplifier 30 and spectrum analyzer 40, can also should
Lithium battery removes the power supply power supply for meeting power reguirements using other；The gain of first amplifier 12 and the second amplifier 13 is
The operating frequency range of the second amplifying circuit of 30dB, the first amplifier 12 and the second amplifier 13 composition is 1MHz-100MHz.
When being tested, signal projector 10, signal receiver one of them are placed in tested shielding cavity, and another one is placed in tested
Outside shielding cavity, swept signal source generates the radiofrequency signal of band frequency consecutive variations from 1MHz to 100MHz, frequency variation
Amplitude is 0.5MHz, after which is amplified twice by the first amplifier 12 and the second amplifier 13, is emitted by antenna 15
Out, signal is received by antenna 20 after the decaying of shielding cavity to be measured and is sent to preamplifier 30, preamplifier
The signal received is amplified processing by 30, and will be sent to spectrum analyzer, spectrum analyzer by amplified signal
Waveform diagram is generated on a display screen according to the signal received, reflects screen of the tested shield in 1MHz-100MHz frequency range
Cover efficiency.
Obviously, above-described embodiment is used for the purpose of clearer expression technical solution of the present invention example, rather than right
The restriction of embodiment of the present invention.To those skilled in the art, it can also make on the basis of the above description other
Various forms of variations or variation, without departing from the inventive concept of the premise, these are all within the scope of protection of the present invention.Cause
The scope of protection of the patent of the invention shall be subject to the appended claims for this.
Claims (4)
1. a kind of shield effectiveness detection system, which is characterized in that further include signal receiver including signal projector；
Wherein, the signal projector includes signal source, signal amplification module, power supply and antenna composition；
Wherein, the signal source, the signal amplification module and the antenna are sequentially connected, the power supply respectively with the signal
Source is connected with the signal amplification module, for powering to the signal source and the signal amplification module；
The signal amplification module includes the first amplifier and the second amplifier, first amplifier and second amplifier
Second amplifying circuit is formed, the input terminal of first amplifier is connected with the signal source, the output of second amplifier
End is connected with the antenna；
The signal receiver includes antenna, preamplifier, signal processing module and power module, the antenna, it is described before
It sets amplifier and the signal processing module is sequentially connected, the power module is used for the preamplifier and the signal
Processing module power supply；
The signal projector is used to receive the radio frequency letter of the signal projector transmitting for emitting radiofrequency signal, the antenna
Number, and the radiofrequency signal received is sent to the preamplifier, the preamplifier is used for the radio frequency that will be received
Signal amplifies processing, and amplified radiofrequency signal is sent to the signal processing module, the signal processing module
User is fed back to after the radiofrequency signal received is handled.
2. a kind of shield effectiveness detection system as described in claim 1, which is characterized in that the signal source is swept signal source
Or point-frequency signal source, the swept signal source are used to generate the radiofrequency signal of a band frequency consecutive variations, the point-frequency signal source
For generating the radiofrequency signal of specific frequency.
3. a kind of shield effectiveness detection system as described in claim 1, which is characterized in that the signal processing module includes control
Molding block, analysis module and display module, the control module are used to control the work of the analysis module and the display module
Operation mode and working condition, the analysis module are used to be analyzed and processed the radiofrequency signal received, and by treated
Data are sent to the display module, and the data feedback that the display module is used to send analysis module is to user.
4. a kind of shield effectiveness detection system as described in claim 1, which is characterized in that the power module includes detachable
External power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610388713.9A CN105827358B (en) | 2016-06-03 | 2016-06-03 | A kind of apparatus and system for shield effectiveness detection |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610388713.9A CN105827358B (en) | 2016-06-03 | 2016-06-03 | A kind of apparatus and system for shield effectiveness detection |
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| Publication Number | Publication Date |
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| CN105827358A CN105827358A (en) | 2016-08-03 |
| CN105827358B true CN105827358B (en) | 2019-02-26 |
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| CN201610388713.9A Active CN105827358B (en) | 2016-06-03 | 2016-06-03 | A kind of apparatus and system for shield effectiveness detection |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106680757A (en) * | 2017-01-03 | 2017-05-17 | 张涉应 | Detection device used for spherical enveloped anti-interference digital electric meter and using method of said device |
| CN111122987B (en) * | 2019-12-26 | 2020-12-04 | 华北电力大学 | Magnetic field shielding effectiveness prediction method and system |
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| CN102307052A (en) * | 2011-09-23 | 2012-01-04 | 长春卓尔信息安全产业股份有限公司 | Intelligent fixed-frequency interferometer |
| 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 |
| EP2780728A4 (en) * | 2011-10-27 | 2015-05-20 | Comsonics Inc | Shielding integrity testing for cable drop |
| CN104678190A (en) * | 2015-02-16 | 2015-06-03 | 第二炮兵工程设计研究院 | System and method for testing shielding efficacy |
| CN104849592A (en) * | 2015-05-12 | 2015-08-19 | 中国科学院国家天文台 | Radio telescope broadband electromagnetic shielding effectiveness detection system and detection method thereof |
| CN205792615U (en) * | 2016-06-03 | 2016-12-07 | 广州市诚臻电子科技有限公司 | A kind of Apparatus and system for shield effectiveness detection |
-
2016
- 2016-06-03 CN CN201610388713.9A patent/CN105827358B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102307052A (en) * | 2011-09-23 | 2012-01-04 | 长春卓尔信息安全产业股份有限公司 | Intelligent fixed-frequency interferometer |
| EP2780728A4 (en) * | 2011-10-27 | 2015-05-20 | Comsonics Inc | Shielding integrity testing for cable drop |
| 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 |
| CN104678190A (en) * | 2015-02-16 | 2015-06-03 | 第二炮兵工程设计研究院 | System and method for testing shielding efficacy |
| CN104849592A (en) * | 2015-05-12 | 2015-08-19 | 中国科学院国家天文台 | Radio telescope broadband electromagnetic shielding effectiveness detection system and detection method thereof |
| CN205792615U (en) * | 2016-06-03 | 2016-12-07 | 广州市诚臻电子科技有限公司 | A kind of Apparatus and system for shield effectiveness detection |
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| CN105827358A (en) | 2016-08-03 |
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