CN104849592A - Radio telescope broadband electromagnetic shielding effectiveness detection system and detection method thereof - Google Patents
Radio telescope broadband electromagnetic shielding effectiveness detection system and detection method thereof Download PDFInfo
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Abstract
The present invention discloses a radio telescope broadband electromagnetic shielding effectiveness detection system and a detection method thereof. The detection system comprises a transmitting module and a receiving module. The transmitting module comprises a signal source and a transmitting antenna. The signal source is used for emitting an electrical signal with specified frequency and the electrical signal is emitted by the transmitting antenna. The receiving module comprises a spectrum analyzer and a receiving antenna which is used for receiving the electrical signal emitted by the signal source and transmitting the received electrical signal to the spectrum analyzer. The spectrum analyzer is electrically coupled to the signal source to ensure the synchronization of sending and receiving the electrical signal. The spectrum analyzer receives electrical signals emitted before and after the signal source is placed into a shielding body, and thus the shielding performance of the shielding body is calculated. The detection system can detect a plurality of frequency points in a frequency band, the detection efficiency is high, the influence of a manual test on a tester is avoided, a detection result report is generated automatically, and time and labor are saved.
Description
Technical field
The present invention relates to electromagnet shield effect detection field, particularly relate to a kind of radio telescope wideband electromagnetic shield effectiveness detection system and detection method.
Background technology
Radio astronomical telescope is observed from the very faint radio signal in universe, and reception frequency range can cover the frequency range from tens MHz to GHz up to a hundred.Because radio telescope has high sensitivity, very easily receive from extraneous and own radio interference, thus the normal operation of impact and Scientific output.For national major science and technology infrastructure projects 500 meters of bore spherical radio telescopes (FAST), its frequency of operation is at 70MHz-3000MHz, the radio telescope of maximum caliber in the world will be become after building up, sensitivity is very high, also very high to platform location periphery electromagnetic environment requirements, the radio interference from ground can affect the work of radio astronomical telescope.Therefore, propose to the electromagnetic shielding chamber in the FAST station, shielding cabinet the requirement that 70MHz-3000MHz frequency inner screening usefulness is greater than 120dB, this just needs to carry out strict electromagnet shield effect test.
The existing method of testing to shield electromagnet shield effect normally with manual test, single-frequency point test, manual record, arrange and carry out accordance and be judged as main; There are the following problems for it:
1, testing result is imperfect; Because radio telescope observing frequency scope is very wide, if select limited Frequency point to detect, frequency as conventionally test only surveys 100MHz, 450MHz, 950MHz, 3GMHz tetra-frequencies in 70MHz-3GMHz, cause test result imperfect, occur that some frequency can not meet the demands, thus the normal operation of interference radio telescope.
2, testing efficiency is low; Owing to needing the shield of test more, if increase test frequency, the workload of manual test will roll up, and testing efficiency is low.
3, the health of radiation effect tester; Because tester's manual operation will be exposed in radiation field, unfavorable to the health of tester.
4, test result arranges wastes time and energy; Owing to making testing journal sheet's length consuming time by hand, and easily cause the not objective of test result.
Therefore, become if solved the problem the technical matters that those skilled in the art need solution badly.
Summary of the invention
For Problems existing in background technology, the object of the present invention is to provide a kind of radio telescope wideband electromagnetic shield effectiveness detection system and detection method, the application can detect multiple frequencies in frequency band, detection efficiency high, avoid manual test to the impact of tester and automatically generate testing result form, time saving and energy saving.
The object of the invention is to be achieved through the following technical solutions:
A kind of radio telescope wideband electromagnetic shield effectiveness detection system, described detection system comprises transmitter module and receiver module; Described transmitter module comprises signal source and emitting antenna, and described signal source is for sending the electric signal of assigned frequency and sending through described emitting antenna; Described receiver module comprises frequency spectrograph and receiving antenna, the electric signal that described receiving antenna sends for receiving described signal source, and the electric signal transmission extremely described frequency spectrograph that will receive; Described frequency spectrograph and described signal source electric coupling, to ensure that the two sends and receive the synchronous of electric signal; Described frequency spectrograph receives described signal source respectively and puts into the electric signal sent before and after shield, and then calculates the shield effectiveness of shield.
Further, described frequency spectrograph and described signal source realize electric coupling by optical fiber, connect therebetween without metal, to avoid the impact of metal connection on shield effectiveness test accuracy.
Further, the detection method based on described detection system comprises the steps:
1) use Fiber connection frequency spectrograph and signal source, makes described signal source send signal and described frequency spectrograph Received signal strength is synchronous, and frequency spectrograph is connected with receiving antenna, and signal source is connected with emitting antenna;
2) described signal source is controlled according to the power set and frequency output signal;
3) frequency controlling described frequency spectrograph Received signal strength is consistent with the frequency that described signal source sends signal;
4) described frequency spectrograph receives described signal source respectively and puts into the electric signal sent before and after shield, and the data that autostore receives;
5) utilize step 4) in data and calculate the shield effectiveness of shield according to shield effectiveness.
Further, described step 3) be specially: the output power first arranging the initial frequency that will detect frequency band and the detection frequency number stopped in frequency, frequency band and signal source, then controls described signal source according to the power set and frequency output signal.
Further, described detection method also comprises step 6): automatic generating masking usefulness form after calculating the shield effectiveness of shield.
The present invention has following positive technique effect:
The application can detect multiple frequencies in frequency band, detection efficiency high, avoid manual test to the impact of tester and automatically generate testing result form, time saving and energy saving.
Accompanying drawing explanation
Fig. 1 is the structural representation of detection system of the present invention;
Fig. 2 is the structural representation that transmitter module of the present invention puts into shield inside.
Embodiment
Below, with reference to accompanying drawing, the present invention is more fully illustrated, shown in the drawings of exemplary embodiment of the present invention.But the present invention can be presented as multiple multi-form, and should not be construed as the exemplary embodiment being confined to describe here.But, these embodiments are provided, thus make the present invention comprehensively with complete, and scope of the present invention is fully conveyed to those of ordinary skill in the art.
For ease of illustrating, here can use such as " on ", the space relative terms such as D score " left side " " right side ", for illustration of the element of shown in figure or the feature relation relative to another element or feature.It should be understood that except the orientation shown in figure, spatial terminology is intended to comprise device different azimuth in use or operation.Such as, if the device in figure is squeezed, be stated as the element being positioned at other elements or feature D score will be positioned at other elements or feature " on ".Therefore, exemplary term D score can comprise upper and lower both orientation.Device can otherwise be located (90-degree rotation or be positioned at other orientation), and space used here illustrates relatively can correspondingly explain.
Electromagnet shield effect test ultimate principle is as follows:
Shielding utilizes shield to stop or reduces a kind of measure of transmission of electromagnetic energy.Shield is a kind of restraining barrier in order to close equipment or device.
The performance of shield represents with shield effectiveness.The definition of shield effectiveness is: when shielding given external source, certain a bit on shield lay before and after electric field intensity or the ratio of magnetic field intensity, that is:
SE in formula---shield effectiveness, multiple;
E0---any electric field intensity or magnetic field intensity during unshielded body;
E1---lay electric field or the magnetic field intensity of same point after shield.
According to the definition of above shield effectiveness, as long as under keeping the condition of same incident field power, measure the field intensity before and after same point shielding respectively, its ratio is exactly shield effectiveness, usually represents with decibel:
It is difficult for measuring certain any absolute field strength.In shield effectiveness is measured, often need the corresponding probe of character selection of the size according to tested shield, shielding, and this kind of probe is generally uncertified, even if use electromagnetic interference measuring apparatus to make indicating instrument.Also induced voltage can only be recorded.
The probe being generally used for shield EMC measurement all belongs to linear unit, and the induced voltage of namely popping one's head in is directly proportional to extraneous field intensity, and survey measurements is:
U
0＝KE
0U
1＝KE
1
U0 in formula---the induced voltage before shielding on probe;
U1---the induced voltage after shielding on probe;
K---relevant with probe parameter is normal.
Such shield effectiveness can represent with the ratio of the inductive voltage value before and after shielding on probe, that is:
The indicating graduation of voltage disturbance measuring instrument is that shield effectiveness is in units of dB μ V:
SE
dB＝U
0dB-U
1dB
Therefore, shield effectiveness is the difference of the decibel counting before and after shielding on electromagnetic interference measuring apparatus.
It is more than the ultimate principle that shield effectiveness is measured.But for the shield of different size, different according to electric-field sensor difference, emissive source and the receiving equipment selected, its measuring method is discrepant.The domestic shield effectiveness measurement for screened room or small-sized shielding case body at present respectively has standard:
Large-scale screened room: GB/T 12190-2006
Small-sized shielded box: GJB 5185-2003, GB/T 18663.3-2007
As shown in Figure 1-2, a kind of radio telescope wideband electromagnetic shield effectiveness detection system of the application, this detection system comprises transmitter module and receiver module; Wherein, transmitter module comprises signal source and emitting antenna, and signal source is for sending the electric signal of assigned frequency and sending through emitting antenna; Receiver module comprises frequency spectrograph and receiving antenna, and receiving antenna is used for the electric signal that Received signal strength source sends, and by the electric signal transmission of reception to frequency spectrograph; Frequency spectrograph and signal source electric coupling, to ensure that the two sends and receive the synchronous of electric signal; The electric signal sent before and after shield put into by frequency spectrograph respectively Received signal strength source, and then calculates the shield effectiveness of shield.Wherein, Agilent N9020A (instrument carries Windows XP operating system, so configure computer for controlling no longer separately) selected by frequency spectrograph; Windows XP operating system: realize hardware driving management, file operation process and network communication services, for Matlab software provides base layer support.Matlab: the Core Feature realizing wideband electromagnetic shield effectiveness Auto-Test System, comprises signal source control, frequency spectrograph control, test data process, algorithm, data sheet automatic generation function.Signal source selects Agilent N5181B.
Preferably, described frequency spectrograph and described signal source realize electric coupling by optical fiber, connect therebetween without metal, to avoid the impact of metal connection on shield effectiveness test accuracy.Frequency spectrograph and signal source collaborative work.Signal source is positioned in screened room, and frequency spectrograph is positioned over outside screened room.Both utilize fiber optic network communication, without metal contact wires, can ensure the true shield effectiveness of not interference shielding room.Frequency spectrograph and signal source all support LXI (LAN eXtension for instrumentation) agreement, run on Ethernet, use Ethernet protocol completely in network layer, make it possible to simple reformation and become the general networking based on optical fiber to link, command transfer postpones to be less than 1ms.
Frequency spectrograph itself runs an operating system, is equivalent to a computing machine, can uses LXI protocol integrated test system frequency spectrograph itself and signal source simultaneously, can high speed collaborative work both making.Meanwhile, completed integrated for the work needing frequency spectrograph, signal source, computer for controlling three instruments to complete by two instruments.
Utilize network communication can change the frequency of signal source fast, after setting a frequency, and then use frequency spectrograph to measure the power received at this frequency place.Measure a Frequency point required time about 3 seconds, much smaller than classic method.
For FAST service band: He Ne laser 100 frequencies, are approximated to Geometric Sequence, can covering 70MHz to the 3GHz wave band of very dense, and Measuring Time used is less than 5 minutes.Frequency number and start to terminate frequency and can carry out free adjustment according to concrete testing requirement.100MHz, 450MHz, 950MHz, 3GHz tetra-frequencies are only measured, more comprehensively and cover FAST wave band fast relative to classic method.After automatically measuring generated frequency point, measure an environmental interference, the interference frequency being subject to the frequency ranges such as mobile communication is removed.Get final product intensive coverage test frequency range like this, environmental interference can be reduced to again minimum.
Test with the first step datum power received again to deduct shield effectiveness and test the power received, namely obtain shield effectiveness.Because be relative measurement, there is another convenience: cable decay and amplifier all need not strictly be demarcated, and only need to use identical cable and amplifier simultaneously.
Preferably, the detection method based on detection system comprises the steps:
1) use Fiber connection frequency spectrograph and signal source, makes signal source send signal and frequency spectrograph Received signal strength is synchronous, and frequency spectrograph is connected with receiving antenna, and signal source is connected with emitting antenna;
2) control signal source is according to the power set and frequency output signal;
3) frequency controlling frequency spectrograph Received signal strength is consistent with the frequency that signal source sends signal;
4) frequency spectrograph puts into the electric signal sent before and after shield in Received signal strength source respectively, and the data that autostore receives;
5) utilize step 4) in data and calculate the shield effectiveness of shield according to shield effectiveness.
Preferably, step 3) be specially: the output power first arranging the initial frequency that will detect frequency band and the detection frequency number stopped in frequency, frequency band and signal source, then controls described signal source according to the power set and frequency output signal.
Preferably, detection method also comprises step 6): automatic generating masking usefulness form after calculating the shield effectiveness of shield.
The source code of the application is as follows:
Radio telescope wideband electromagnetic shield effectiveness Auto-Test System obtains embody rule in FAST engineering EMC tests, and has carried out the repeatedly measurement of shield effectiveness.In Dec, 2014 is here carry out the application example of shield effectiveness measurement at great Wo Dang scene.
Testing apparatus is arranged: indoor emitting antenna and outdoor receiving antenna spacing 2 meters, same level height and polarization.The index coordinates of Fiber connection control signal source in 70-3000MHz test specification evenly chooses 100 measurement points.Frequency spectrograph synchronously receives test.
Rope drives 7H electric shield room shield effectiveness test result: this screened room design objective is that 70MHz-3000MHz is more than or equal to 120dB, and test display 200MHz-2GHz meets the demands.Tested person antenna limits, and 70-200MHz measurement sensistivity is inadequate, and change low-frequency antenna herein, 2GHz does not reach requirement with upper part due to reasons such as screened room weld seam and shield doors, need rectify and improve.
High dynamic range, wideband electromagnetic shield effectiveness Auto-Test System have dropped into the application of FAST actual measurement of engineering, and system is easy to use, test is efficient, can test the shield effectiveness of 120dB, test result is objective and accurate.Solve traditional shield effectiveness manual test Problems existing.Meet the electromagnet shield effect testing requirement of the broadband of radio astronomical telescope requirement, high dynamic range.
Described just in order to the present invention is described above, be construed as the present invention and be not limited to above embodiment, meet the various variants of inventive concept all within protection scope of the present invention.
Claims (5)
1. a radio telescope wideband electromagnetic shield effectiveness detection system, is characterized in that, described detection system comprises transmitter module and receiver module; Described transmitter module comprises signal source and emitting antenna, and described signal source is for sending the electric signal of assigned frequency and sending through described emitting antenna; Described receiver module comprises frequency spectrograph and receiving antenna, the electric signal that described receiving antenna sends for receiving described signal source, and the electric signal transmission extremely described frequency spectrograph that will receive; Described frequency spectrograph and described signal source electric coupling, to ensure that the two sends and receive the synchronous of electric signal; Described frequency spectrograph receives described signal source respectively and puts into the electric signal sent before and after shield, and then calculates the shield effectiveness of shield.
2. detection system according to claim 1, is characterized in that, described frequency spectrograph and described signal source realize electric coupling by optical fiber, connects therebetween without metal, to avoid the impact of metal connection on shield effectiveness test accuracy.
3. based on the detection method of detection system described in claim 1 or 2, it is characterized in that, described method comprises the steps:
1) use Fiber connection frequency spectrograph and signal source, makes described signal source send signal and described frequency spectrograph Received signal strength is synchronous, and frequency spectrograph is connected with receiving antenna, and signal source is connected with emitting antenna;
2) described signal source is controlled according to the power set and frequency output signal;
3) frequency controlling described frequency spectrograph Received signal strength is consistent with the frequency that described signal source sends signal;
4) described frequency spectrograph receives described signal source respectively and puts into the electric signal sent before and after shield, and the data that autostore receives;
5) utilize the data in step 4) and calculate the shield effectiveness of shield according to shield effectiveness.
4. detection method according to claim 3, it is characterized in that, described step 3) is specially: the output power first arranging the initial frequency that will detect frequency band and the detection frequency number stopped in frequency, frequency band and signal source, then controls described signal source according to the power set and frequency output signal.
5. detection method according to claim 3, is characterized in that, described detection method also comprises step 6): automatic generating masking usefulness form after calculating the shield effectiveness of shield.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105827358A (en) * | 2016-06-03 | 2016-08-03 | 广州市诚臻电子科技有限公司 | Device and system for shielding effectiveness detection |
| 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 |
| CN109116182A (en) * | 2018-06-13 | 2019-01-01 | 山东康威通信技术股份有限公司 | The device and method of communication cable-end shielding case shield effectiveness measurement |
| CN109239470A (en) * | 2018-09-04 | 2019-01-18 | 广州市诚臻电子科技有限公司 | A kind of screened room of draw and insert-type more switching test system |
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| CN112763818A (en) * | 2020-12-18 | 2021-05-07 | 北京无线电计量测试研究所 | Device and method for measuring broadband shielding effectiveness of small shield |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101052292A (en) * | 2007-05-13 | 2007-10-10 | 苏州沃野系统控制技术有限公司 | Electromagnetic compatible shield device and measuring method for electromagnetic shield effect |
| CN201196667Y (en) * | 2008-05-20 | 2009-02-18 | 常州雷宁电磁屏蔽设备有限公司 | Shielding performance detection apparatus of shield room |
| CN101813732A (en) * | 2010-05-10 | 2010-08-25 | 中国人民解放军理工大学 | Shielding effectiveness testing system for near-zone low-frequency strong magnetic field and testing method thereof |
| US20100233969A1 (en) * | 2007-09-20 | 2010-09-16 | University Of South Florida | Reconfigurable chamber for emulating multipath fading |
| CN103308798A (en) * | 2013-05-27 | 2013-09-18 | 华北电力大学 | Method for testing shielding effectiveness of electromagnetic shielding material |
| CN103630777A (en) * | 2013-11-19 | 2014-03-12 | 陕西海泰电子有限责任公司 | Electric equipment shielding effectiveness test system and method |
| CN104267265A (en) * | 2014-09-30 | 2015-01-07 | 中国科学院新疆天文台 | Evaluating system and method based on radio astronomical instrument device electromagnetic radiation |
| CN204613328U (en) * | 2015-05-12 | 2015-09-02 | 中国科学院国家天文台 | A kind of radio telescope wideband electromagnetic shield effectiveness detection system |
-
2015
- 2015-05-12 CN CN201510237882.8A patent/CN104849592B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101052292A (en) * | 2007-05-13 | 2007-10-10 | 苏州沃野系统控制技术有限公司 | Electromagnetic compatible shield device and measuring method for electromagnetic shield effect |
| US20100233969A1 (en) * | 2007-09-20 | 2010-09-16 | University Of South Florida | Reconfigurable chamber for emulating multipath fading |
| CN201196667Y (en) * | 2008-05-20 | 2009-02-18 | 常州雷宁电磁屏蔽设备有限公司 | Shielding performance detection apparatus of shield room |
| CN101813732A (en) * | 2010-05-10 | 2010-08-25 | 中国人民解放军理工大学 | Shielding effectiveness testing system for near-zone low-frequency strong magnetic field and testing method thereof |
| CN103308798A (en) * | 2013-05-27 | 2013-09-18 | 华北电力大学 | Method for testing shielding effectiveness of electromagnetic shielding material |
| CN103630777A (en) * | 2013-11-19 | 2014-03-12 | 陕西海泰电子有限责任公司 | Electric equipment shielding effectiveness test system and method |
| CN104267265A (en) * | 2014-09-30 | 2015-01-07 | 中国科学院新疆天文台 | Evaluating system and method based on radio astronomical instrument device electromagnetic radiation |
| CN204613328U (en) * | 2015-05-12 | 2015-09-02 | 中国科学院国家天文台 | A kind of radio telescope wideband electromagnetic shield effectiveness detection system |
Cited By (12)
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|---|---|---|---|---|
| CN105827358A (en) * | 2016-06-03 | 2016-08-03 | 广州市诚臻电子科技有限公司 | Device and system for shielding effectiveness detection |
| CN105827358B (en) * | 2016-06-03 | 2019-02-26 | 广州市诚臻电子科技有限公司 | A kind of apparatus and system for shield effectiveness detection |
| 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 |
| CN109116182A (en) * | 2018-06-13 | 2019-01-01 | 山东康威通信技术股份有限公司 | The device and method of communication cable-end shielding case shield effectiveness measurement |
| CN109239470A (en) * | 2018-09-04 | 2019-01-18 | 广州市诚臻电子科技有限公司 | A kind of screened room of draw and insert-type more switching test system |
| CN109239470B (en) * | 2018-09-04 | 2023-06-23 | 广州市诚臻电子科技有限公司 | Shielding room of extraction-insertion type replacement testing system |
| CN109991497A (en) * | 2019-04-11 | 2019-07-09 | 中国科学院新疆天文台 | A kind of dualbeam coolant receiver calibration method |
| CN112578190A (en) * | 2020-11-25 | 2021-03-30 | 中国科学院上海光学精密机械研究所 | FAST distributed optical fiber universe monitoring system |
| CN112578190B (en) * | 2020-11-25 | 2023-03-14 | 中国科学院上海光学精密机械研究所 | FAST distributed optical fiber universe monitoring system |
| CN112763818A (en) * | 2020-12-18 | 2021-05-07 | 北京无线电计量测试研究所 | Device and method for measuring broadband shielding effectiveness of small shield |
| CN112763818B (en) * | 2020-12-18 | 2023-10-13 | 北京无线电计量测试研究所 | Device and method for measuring broadband shielding effectiveness of small shielding body |
| CN117825849A (en) * | 2024-01-02 | 2024-04-05 | 北京航空航天大学 | Cooperative control system and test method for cable shielding effectiveness reverberation room test |
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