CN103105541A - Near field probe used for detecting electromagnetic interference radiation performance and application method thereof - Google Patents
Near field probe used for detecting electromagnetic interference radiation performance and application method thereof Download PDFInfo
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- CN103105541A CN103105541A CN2013100361734A CN201310036173A CN103105541A CN 103105541 A CN103105541 A CN 103105541A CN 2013100361734 A CN2013100361734 A CN 2013100361734A CN 201310036173 A CN201310036173 A CN 201310036173A CN 103105541 A CN103105541 A CN 103105541A
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Abstract
The invention provides a near field probe used for detecting electromagnetic interference radiation performance. The near field probe used for detecting electromagnetic interference radiation performance comprises an electric field/magnetic field sensor, a photoelectricity conversion module and optical fibers, the electric field/magnetic field sensor comprises a three-hole optical fiber inserting core, three electric light/magnetic light crystals with different polarization directions, and a protective sleeve, three optical fibers drawn from the photoelectricity conversion module are respectively connected with the three electric light/magnetic light crystals with different polarization directions through the three-hole optical fiber inserting core, and the photoelectricity conversion module comprises a laser device, a 1*3 optical fiber beam splitter, three photoelectricity detectors, three optical fiber circulators, three optical polarization controllers and three radiofrequency output interfaces. The invention further provides an application method of the near field probe used for detecting electromagnetic interference radiation performance. The near field probe used for detecting electromagnetic interference radiation performance and the application method of the near field probe used for detecting electromagnetic interference radiation performance have the advantages that a circumscribed light source and the photoelectricity detector are unnecessary, a traditional radiofrequency output interface is used for outputting, measuring and application methods are compatible with an existing electromagnetic interference measuring system, and an electricity probe can be directly replaced to conduct electromagnetic interference test.
Description
Technical field
The present invention relates to a kind of near field probes for detection of the electromagnetic interference (EMI) emissions performance and using method thereof, belong to electromagnetic field near field measurement field.
Background technology
Electromagnetic interference (EMI) is an important content in electromagnetic compatibility field, and is more and more higher along with the dominant frequency of electronic product, wiring density is increasing and the use of many level and ground cutting techniques, exists a large amount of radiation interference on circuit board.Be to solve from the design source electromagnetic interference problem of product, just need to measure the space distribution of the electromagnetic interference (EMI) of circuit board, this just need to use the near-field measurement technique of electromagnetic field.The tradition near field probes adopts electrical method more, has defective at aspects such as bandwidth, antijamming capability and invasive measurements.For overcoming the problems referred to above, the optics electromagnetic field measuring device of employing electric light/magneto-optic memory technique has been arranged.A kind of electric field/magnetic field probe as described in patent CN201080029283.2, the characteristic that the refractive index of utilizing laser to enter into material and material changes corresponding to the intensity of electric field/magnetic field is by obtaining the information in respective electric field/magnetic field to the measurement of light signal.This technology is being expanded the probe bandwidth, and improving measurement space resolution aspect has huge advantage, has a extensive future.But the present problem of this technology is, probe front end sensing area complex structure, and labile factor is many, and measuring uncertainty is large; Need external laser instrument and photodetector, with the poor compatibility of existing near-field measurement system.
Summary of the invention
Technical matters to be solved by this invention is to provide a kind of near field probes for detection of the electromagnetic interference (EMI) emissions performance and using method thereof, and this sonde configuration is simple, can be compatible with existing near-field measurement system, and Measurement sensibility is high.
the present invention adopts following technological means to solve the problems of the technologies described above: a kind of near field probes of the radiance for detection of electromagnetic interference (EMI), comprise the electric field/magnetic field sensor, photoelectric conversion module, and optical fiber, described electric field/magnetic field sensor comprises three hole fiber stubs, electric light/the magneto-optical crystal of three different polarised directions, protecting pipe, three optical fiber that photoelectric conversion module is drawn are connected from the electric light/magneto-optical crystal of three different polarised directions respectively via three hole fiber stubs, the optical fiber of electric light/magneto-optical crystal and introducing three hole fiber stubs all is fixed on three hole fiber stubs,
described photoelectric conversion module comprises laser instrument, 1 * 3 fiber optic splitter, three photodetectors, three optical fiber circulators, three optical fiber polarization controllers and three radio frequency output interface, 1 * 3 fiber optic splitter is divided into three tunnel first ports that enter respectively three identical optical fiber circulators with one road laser of laser instrument output, all be connected by optical fiber between laser instrument and 1 * 3 fiber optic splitter and between 1 * 3 fiber optic splitter and optical fiber circulator, second port of each optical fiber circulator is connected with the electric field/magnetic field sensor by optical fiber respectively, the 3rd port of each optical fiber circulator is connected with a photodetector by an optical fiber polarization controller respectively, each photodetector is connected with a radio frequency output interface.
Further, described electric field/magnetic field sensor also comprises protecting pipe, and three hole fiber stubs are fixed on protecting pipe inside.
Further, described laser instrument, 1 * 3 fiber optic splitter, optical fiber circulator, photodetector and optical fiber polarization controller all are fixed in metal screen case.
the present invention also provides a kind of using method of near field probes of the radiance for detection of electromagnetic interference (EMI) as above, comprise: at first described laser instrument and photodetector are connected with power interface, provide operating voltage by outside D.C. regulated power supply, the laser instrument Output of laser is divided into three the tunnel by 1 * 3 fiber optic splitter and enters the electric field/magnetic field sensor by three fiber optical circulators respectively, then return to fiber optical circulator, the 3rd port output by fiber optical circulator enters photodetector through optical fiber polarization controller, photodetector is converted to electric signal with light signal and exports by radio frequency output interface.
The invention has the advantages that: laser instrument is built in probe, and complete the conversion of photosignal in the inside of popping one's head in by photodetector, need not external light source and photodetector, export by the conventional radio frequency output interface, measurement and use-pattern and existing electromagnetic interference measurement, EMI measurement system compatible can directly be replaced the electricity probe and carry out Electromagnetic Interference Test.
Description of drawings
Fig. 1 is structural representation of the present invention.
Fig. 2 is the structure for amplifying schematic diagram of electric field/magnetic field sensor of the present invention.
Embodiment
Below in conjunction with accompanying drawing, invention is described in detail:
Please consult simultaneously illustrated in figures 1 and 2ly, a kind of near field probes of the radiance for detection of electromagnetic interference (EMI) comprises electric field/magnetic field sensor 10, photoelectric conversion module 3, optical fiber 6.
Described electric field/magnetic field sensor 10 comprises electric light/magneto-optical crystal 12, the protecting pipe 13 of three hole fiber stubs 11, three different polarised directions.Three optical fiber 6 that photoelectric conversion module 3 is drawn are connected from the electric light/magneto-optical crystal 12 of three different polarised directions respectively via three hole fiber stubs 11, electric light/magneto-optical crystal 12 and the optical fiber 6 of introducing three hole fiber stubs 11 all are fixed on three hole fiber stubs 11, and three hole fiber stubs 11 are fixed on protecting pipe 13 inside.
Described photoelectric conversion module 3 comprises laser instrument 2,1 * 3 fiber optic splitter 4, three photodetectors 7, three optical fiber circulators 8, three optical fiber polarization controllers 9 and three radio frequency output interface 5.1 * 3 fiber optic splitter 4 is divided into three tunnel first ports that enter respectively three identical optical fiber circulators 8 with one road laser of laser instrument 2 output, all be connected by optical fiber 6 between laser instrument 2 and 1 * 3 fiber optic splitter 4 and between 1 * 3 fiber optic splitter 4 and optical fiber circulator 8, second port of each optical fiber circulator 8 is connected with electric field/magnetic field sensor 10 by optical fiber 6 respectively.The 3rd port of each optical fiber circulator 8 is connected with a photodetector 7 by an optical fiber polarization controller 9 respectively, and each photodetector 7 is connected with a radio frequency output interface 5.Therefore, each optical fiber circulator 8 is corresponding to the different polarization components detection channels of electric field/magnetic field, three radio frequency output interface 5, three polarization components of corresponding electric field/magnetic field respectively.Described radio frequency output interface 5 is used traditional radio frequency output interface.
During use, described laser instrument 2 and photodetector 7 are connected with power interface 1, provide operating voltage by outside D.C. regulated power supply.Laser instrument 2 Output of lasers are divided into three the tunnel by 1 * 3 fiber optic splitter 4 and enter electric field/magnetic field sensor 10 by three fiber optical circulators 8 respectively, then return to fiber optical circulator 8, the 3rd port output by fiber optical circulator 8 enters photodetector 7 through optical fiber polarization controller 9, and photodetector 7 is converted to electric signal by radio frequency output interface 5 outputs with light signal.
The opticses such as laser instrument 2,1 * 3 fiber optic splitter 4, optical fiber circulator 8, photodetector 7 and optical fiber polarization controller 9 all are fixed in metal screen case 20.
This near field probes can be measured by the electric light/magneto-optical crystal 12 of three different polarised directions three polarization components of electric field/magnetic field in use simultaneously, also can be separately by polarization components of an electric light/magneto-optical crystal 12 monitorings.
The inner integration laser 2 of this photoelectric conversion module 3, and complete the conversion of photosignal in the inside of popping one's head in by photodetector 7, by 5 outputs of conventional radio frequency output interface.Radio frequency output interface 5 is compatible with existing near-field measurement system, can directly replace traditional near field probes.
The above is only for the preferred embodiment of the invention; not in order to limit the invention; all in the invention spirit and principle within do any modification, be equal to and replace and improvement etc., within all should being included in the protection domain of the invention.
Claims (4)
1. near field probes for detection of the radiance of electromagnetic interference (EMI), comprise electric field/magnetic field sensor, photoelectric conversion module, and optical fiber, it is characterized in that: described electric field/magnetic field sensor comprises three hole fiber stubs, the electric light/magneto-optical crystal of three different polarised directions, protecting pipe, three optical fiber that photoelectric conversion module is drawn are connected from the electric light/magneto-optical crystal of three different polarised directions respectively via three hole fiber stubs, and the optical fiber of electric light/magneto-optical crystal and introducing three hole fiber stubs all is fixed on three hole fiber stubs;
described photoelectric conversion module comprises laser instrument, 1 * 3 fiber optic splitter, three photodetectors, three optical fiber circulators, three optical fiber polarization controllers and three radio frequency output interface, 1 * 3 fiber optic splitter is divided into three tunnel first ports that enter respectively three identical optical fiber circulators with one road laser of laser instrument output, all be connected by optical fiber between laser instrument and 1 * 3 fiber optic splitter and between 1 * 3 fiber optic splitter and optical fiber circulator, second port of each optical fiber circulator is connected with the electric field/magnetic field sensor by optical fiber respectively, the 3rd port of each optical fiber circulator is connected with a photodetector by an optical fiber polarization controller respectively, each photodetector is connected with a radio frequency output interface.
2. the near field probes of a kind of radiance for detection of electromagnetic interference (EMI) as claimed in claim 1, it is characterized in that: described electric field/magnetic field sensor also comprises protecting pipe, three hole fiber stubs are fixed on protecting pipe inside.
3. the near field probes of a kind of radiance for detection of electromagnetic interference (EMI) as claimed in claim 1, it is characterized in that: described laser instrument, 1 * 3 fiber optic splitter, optical fiber circulator, photodetector and optical fiber polarization controller all are fixed in metal screen case.
4. using method as the near field probes of claim 1 or 2 or 3 described radiances for detection of electromagnetic interference (EMI), it is characterized in that: at first described laser instrument and photodetector are connected with power interface, provide operating voltage by outside D.C. regulated power supply, the laser instrument Output of laser is divided into three the tunnel by 1 * 3 fiber optic splitter and enters the electric field/magnetic field sensor by three fiber optical circulators respectively, then return to fiber optical circulator, the 3rd port output by fiber optical circulator enters photodetector through optical fiber polarization controller, photodetector is converted to electric signal with light signal and exports by radio frequency output interface.
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Cited By (4)
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| CN105911531A (en) * | 2016-04-08 | 2016-08-31 | 中国电子科技集团公司第三十八研究所 | On-site calibration device for phased array antenna |
| CN110168385A (en) * | 2016-09-01 | 2019-08-23 | 阿妮塔·西尔维娅·茨威格-舒斯特 | For carrying out the device of EMC test measurement |
| CN110927499A (en) * | 2019-12-10 | 2020-03-27 | 中国民航大学 | Radio frequency integrated circuit near field electromagnetic compatibility test equipment and test method thereof |
| CN112198374A (en) * | 2020-09-30 | 2021-01-08 | 武汉大学 | High-frequency high-precision space electric field measurement system and method |
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| CN110927499A (en) * | 2019-12-10 | 2020-03-27 | 中国民航大学 | Radio frequency integrated circuit near field electromagnetic compatibility test equipment and test method thereof |
| CN112198374A (en) * | 2020-09-30 | 2021-01-08 | 武汉大学 | High-frequency high-precision space electric field measurement system and method |
| CN112198374B (en) * | 2020-09-30 | 2021-10-22 | 武汉大学 | High-frequency high-precision space electric field measurement system and method |
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