CN110174628A - A kind of portable very fast transient high frequency magnetic field measuring system - Google Patents
A kind of portable very fast transient high frequency magnetic field measuring system Download PDFInfo
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Abstract
The present invention provides a kind of portable very fast transient high frequency magnetic field measuring systems, for measuring to GIS substation high frequency transient magnetic field.The measuring system includes: electromagnetic wave receiving antenna, for receiving the very fast transient high frequency magnetic field signal of GIS switch release；Synchronous triggering device, input terminal are connect with the tail end of electromagnetic wave receiving antenna, for the reception signal of electromagnetic wave receiving antenna within the preset frequency range in the case where, export trigger signal；Signal processing circuit, input terminal are also connect with the tail end of electromagnetic wave receiving antenna, for being digital signal by the reception signal processing of electromagnetic wave receiving antenna；Signal processor is separately connected with synchronous triggering device and signal processing circuit, and is configured to be started according to trigger signal, to handle digital signal.Since signal processor starts according to synchronous triggering signal, reduce power consumption, and save memory space, to save memory capacity needed for measuring system.
Description
Technical field
The present invention relates to field of measurement technique of electrical equipment, more particularly to a kind of portable very fast transient high frequency magnetic field
Measuring system.
Background technique
As GIS (Gas Insulated Switchgear, Cubicle Gas-Insulated Switchgear) substation is at me
State's power grid using more and more extensive, smart grid level is higher and higher, and problem of substation electromagnetic compatibility is more and more prominent.By
It is located near switch yard primary equipment in secondary devices such as Intelligent substation merging unit, intelligent terminals, loses relay protection room
Shielding protection, thus these low power electronics devices based on Principles of Microcomputers substation occur switch operation, system short-circuit or
Person is by the space transient electromagnetic field TEM (Transient for being easy to be generated by electromagnetic interference, especially switch operation when being struck by lightning
Electromagnetic filed), have a significant impact to the safe and reliable operation tool of substation.Therefore, a kind of needle is developed
The measuring device for the fast high frequency transient electromagnetic field of express train that operation generates is switched to reliable, the safety for guaranteeing intelligent substation to GIS
Operation is of great significance to.
The magnetic field that GIS switching operation in substation generates is that occur a kind of express fast along with switch operation electro-magnetic transient
The features such as transient high frequency magnetic field has magnetic field pulse rising edge steep, and amplitude variation is quickly, frequency is high, the key technical indexes parameter
Are as follows: frequency is mainly distributed on 1MHz~60MHz, and field strength (peak-to-peak value) range is 80A/m~110A/m, very fast transient high frequency
These features in magnetic field make existing magnetic field measurement technology and device not be able to satisfy its measurement request.
Summary of the invention
It is an object of the present invention to provide a kind of to meet the portable of GIS substation high frequency transient magnetic-field measurement requirement
Very fast transient high frequency magnetic field measuring system.
A further object of the present invention is to memory capacity needed for measuring system to be saved.
The essence of the radiation field measurement generated when another further object of the present invention is to improve to GIS switch motion
True property.
Another further object of the present invention is to measuring system structure to be made is more compact, portability is improved.
Particularly, the present invention provides a kind of portable very fast transient high frequency magnetic field measuring systems, comprising:
Electromagnetic wave receiving antenna, for receiving the very fast transient high frequency magnetic field signal of GIS switch release；
Synchronous triggering device, input terminal are connect with the tail end of electromagnetic wave receiving antenna, in electromagnetic wave receiving antenna
Reception signal within the preset frequency range in the case where, export trigger signal；
Signal processing circuit, input terminal are also connect with the tail end of electromagnetic wave receiving antenna, for electromagnetic wave to be received day
The reception signal processing of line is digital signal；
Signal processor is separately connected with synchronous triggering device and signal processing circuit, and is configured to be believed according to triggering
Number starting, to handle digital signal.
Optionally, signal processing circuit includes:
Received antenna signal circuit, input terminal are connect with the tail end of electromagnetic wave receiving antenna, for receiving to electromagnetic wave
The reception signal of antenna carries out signal condition；
Electrooptic modulator is connect with the output end of received antenna signal circuit, for by the defeated of received antenna signal circuit
Signal modulation is optical signal out；
First transmission fiber is connect with the light output mouth of electrooptic modulator, is used for output optical signal；
First photoelectric conversion circuit is connect, for converting optical signals to electric signal with the first transmission fiber；
Sample circuit is connect with photoelectric conversion circuit and signal processor, for sampling to electric signal, is counted
Word signal.
Optionally, optical signal output circuit is provided in synchronous triggering device, optical signal output circuit is predetermined frequency model
The antenna enclosed receives signal triggering, the trigger signal of output light form；
Above-mentioned measuring system further include: the second transmission fiber, and optical signal output circuit, for exporting trigger signal；The
Two photoelectric conversion circuits are connect with the second transmission fiber, for trigger signal to be converted to electric trigger signal, to signal processor
It provides.
Optionally, above-mentioned measuring system further include: shielding shell, interior forming member installation cavity, received antenna signal electricity
Road, electrooptic modulator, synchronous triggering device are installed in component installation cavity；First transmission fiber, the second transmission fiber, Yi Ji electricity
Magnetic wave receiving antenna is pierced by from shielding shell.
Optionally, shielding shell is aluminum box, and passes through ground connection, and the first transmission fiber, the second transmission light
Fine and electromagnetic wave receiving antenna is provided with waterproof sealing structure from the position for being pierced by shielding shell.
Optionally, electromagnetic wave receiving antenna be loop aerial, frequency reception signal range be configured to 10kHz~
500MHz。
Optionally, received antenna signal circuit includes the quick FET amplifier of high input resistance, and the non-inverting input terminal of amplifier connects
A PIN limiter is connect, the inverting input terminal of amplifier is connected as voltage follower, and the output end of amplifier connects electrooptic modulator.
Optionally, electrooptic modulator includes:
Laser, for emitting laser beams, the optical parameter of laser beam change with the output signal of received antenna signal circuit；
The polarizer is transformed to linearly polarized light after laser beam is incident for making；
Lithium columbate crystal, for linearly polarized light to be decomposed into two vertical components；
Postpone slide, for making two vertical components generate the phase difference set by delay；And
Analyzer, output generate the optical signal of phase difference.
Optionally, above-mentioned measuring system further include:
Display screen is connect with signal processor, the high frequency transient field waveform for being restored according to digital signal；
External memorizer interface, connect with signal processor, for connecting external memory, for data output.
Optionally, the first photoelectric conversion circuit, the second photoelectric conversion circuit, signal processor, synchronous triggering device, display
Screen, external memorizer Interface integration are on one piece of pcb board.
Portable very fast transient high frequency magnetic field measuring system of the invention, electromagnetic wave receiving antenna receive GIS switch and release
The very fast transient high frequency magnetic field signal put, synchronous triggering device can preset in the reception signal of electromagnetic wave receiving antenna
In frequency range in the case where (field frequency is set when the frequency range is acted according to GIS, can be higher-frequency), output triggering letter
Number, the response time improves anti-electromagnetic interference capability up to nanosecond, using the synchronous triggering mode of multiple spot optical signal, so that at signal
Reason device starts according to synchronous triggering signal, and the reception signal processing of electromagnetic wave receiving antenna is number letter by signal processing circuit
Number；Signal processor starts according to trigger signal, to handle digital signal.Since signal processor is triggered according to synchronous
Signal enabling reduces power consumption, and saves memory space, to save memory capacity needed for measuring system.
Further, portable very fast transient high frequency magnetic field measuring system of the invention, electromagnetic wave receiving antenna receive
The very fast transient high frequency magnetic field signal of GIS switch release, very fast transient high frequency magnetic field signal is through received antenna signal circuit
After receiving signal progress signal condition, optical signal is modulated to by electrooptic modulator.First photoelectric conversion circuit turns optical signal
It is changed to electric signal；Sample circuit samples electric signal, and signal processor is for handling and storing sampled data.Pass through hardware
Optimization, so that measuring system can satisfy the measurement request in GIS substation high frequency transient magnetic field.Due to using optical signal transmission,
It also avoids interfering and decaying in transmission process, so that measurement precision is provided, to assess GIS substation electromagnetic compatibility
Level provides support.
Further, in portable very fast transient high frequency magnetic field measuring system of the invention, sample circuit (including A/
D conversion function) connection signal processor, and by the first photoelectric conversion circuit, the second photoelectric conversion circuit, signal processor, same
Trigger device, display screen, external memorizer Interface integration are walked on one piece of pcb board, reduces system bulk, improving can be portable
Property.
According to the following detailed description of specific embodiments of the present invention in conjunction with the accompanying drawings, those skilled in the art will be brighter
The above and other objects, advantages and features of the present invention.
Detailed description of the invention
Some specific embodiments of the present invention is described in detail by way of example and not limitation with reference to the accompanying drawings hereinafter.
Identical appended drawing reference denotes same or similar part or part in attached drawing.It should be appreciated by those skilled in the art that these
What attached drawing was not necessarily drawn to scale.In attached drawing:
Fig. 1 is the schematic diagram of portable very fast transient high frequency magnetic field measuring system according to an embodiment of the invention；
Fig. 2 is signal processing in portable very fast transient high frequency magnetic field measuring system according to an embodiment of the invention
The schematic diagram of circuit；
Fig. 3 is aerial signal in portable very fast transient high frequency magnetic field measuring system according to an embodiment of the invention
Receive the schematic diagram of circuit；
Fig. 4 is Electro-optical Modulation in portable very fast transient high frequency magnetic field measuring system according to an embodiment of the invention
The schematic diagram of device；
Fig. 5 is the first photoelectricity in portable very fast transient high frequency magnetic field measuring system according to an embodiment of the invention
The schematic diagram of conversion circuit；And
Fig. 6 is synchronous triggering in portable very fast transient high frequency magnetic field measuring system according to an embodiment of the invention
The schematic diagram of device.
Specific embodiment
Fig. 1 is the signal of portable very fast transient high frequency magnetic field measuring system 10 according to an embodiment of the invention
Figure.The portable very fast transient high frequency magnetic field measuring system 10 is generally can include: electromagnetic wave receiving antenna 110 synchronizes
Trigger device 140, signal processing circuit 300, signal processor 340.
Portable very fast transient high frequency magnetic field measuring system 10 can also have shielding shell 150.It shields in shell 150
Forming member installation cavity.Shielding shell 150 can be with aluminum box, and passes through ground connection, and a kind of preferred embodiment is outer for shielding
For shell 150 using with a thickness of 3mm metal aluminium material, size can be 100 × 100 × 75mm, meet electromagnetic shielding requirements and safety
It is required that.
Electromagnetic wave receiving antenna 110 is used to receive the very fast transient high frequency magnetic field signal of GIS switch release.Electromagnetic wave connects
The diameter of loop aerial can be can determine that according to the amplitude-frequency characteristic in magnetic field to be measured using ring structure is used by receiving antenna 110.This
Selection antenna diameter in a kind of one embodiment of the portable very fast transient high frequency magnetic field measuring system 10 provided is invented to take
250mm, can measure field frequency range is 100kHz~150MHz.
The input terminal of synchronous triggering device 140 is connect with the tail end of electromagnetic wave receiving antenna 110, for receiving in electromagnetic wave
The reception signal of antenna 110 within the preset frequency range in the case where, export trigger signal.
The input terminal of signal processing circuit 300 is also connect with the tail end of electromagnetic wave receiving antenna 110, for connecing electromagnetic wave
The reception signal processing for receiving antenna 110 is digital signal.
Signal processor 340 is separately connected with synchronous triggering device 140 and signal processing circuit 300, and is configured to root
Start according to trigger signal, to handle digital signal.The portable very fast transient high frequency magnetic field of the present embodiment measures system
In system 10, electromagnetic wave receiving antenna 110 receives the very fast transient high frequency magnetic field signal of GIS switch release, synchronous triggering device
140 can be in the reception signal within the preset frequency range (when the frequency range is acted according to GIS of electromagnetic wave receiving antenna 110
Field frequency setting, can be higher-frequency) in the case where, trigger signal is exported, the response time up to nanosecond, is believed using multiple spot light
Number synchronous triggering mode improves anti-electromagnetic interference capability, so that signal processor 340 starts according to synchronous triggering signal, at signal
It is digital signal that circuit, which is managed, by the reception signal processing of electromagnetic wave receiving antenna；Signal processor 340 starts according to trigger signal,
To handle digital signal.Since signal processor 340 starts according to synchronous triggering signal, reduce power consumption, and
And memory space is saved, thus memory capacity needed for saving measuring system 10.
Fig. 2 is in portable very fast transient high frequency magnetic field measuring system 10 according to an embodiment of the invention at signal
Manage the schematic diagram of circuit 300.
Portable very fast transient high frequency magnetic field measuring system 10 can also have shielding shell 150.It shields in shell 150
Forming member installation cavity.Shielding shell 150 can be with aluminum box, and passes through ground connection, and a kind of preferred embodiment is outer for shielding
For shell 150 using with a thickness of 3mm metal aluminium material, size can be 100 × 100 × 75mm, meet electromagnetic shielding requirements and safety
It is required that.
Electromagnetic wave receiving antenna 110 can be installed on shielding shell 150 outside, and tail end penetrates component installation cavity, with letter
Received antenna signal circuit 120 in number processing circuit 300 is connected.In measurement, portable very fast transient high frequency magnetic field is surveyed
Amount system 10, in measurement, makes electromagnetic wave receiving antenna 110 perpendicular to ground for being arranged in magnetic-field measurement region.
Signal processing circuit 300 may include: received antenna signal circuit 120, the transmission light of electrooptic modulator 130, first
Fine 210, first photoelectric conversion circuit 310, sample circuit 330.
Received antenna signal circuit 120 is installed in component installation cavity, the tail of input terminal and electromagnetic wave receiving antenna 110
End connection carries out signal condition for the reception signal to electromagnetic wave receiving antenna 110.Fig. 3 is an implementation according to the present invention
The schematic diagram of received antenna signal circuit 120 in the portable very fast transient high frequency magnetic field measuring system 10 of example.Aerial signal
The quick FET amplifier OP1 (field effect transistor operational amplifier) that circuit 120 includes high input resistance is received, amplifier OP1's is same
Phase input terminal connects a PIN limiter (diode clipper), and the inverting input terminal of amplifier OP1 is connected as voltage follower, transports
Put the output end connection electrooptic modulator 130 of OP1.The FET of model ADA4817 can be selected to transport in an alternative embodiment
It puts.
Electrooptic modulator 130 is also installed in component installation cavity.Electrooptic modulator 130 and received antenna signal circuit 120
Output end, for the output signal of received antenna signal circuit 120 to be modulated to optical signal.Fig. 4 is one according to the present invention
The schematic diagram of electrooptic modulator 130 in the portable very fast transient high frequency magnetic field measuring system 10 of embodiment.Electrooptic modulator
130 include: laser 131, the polarizer 132, lithium columbate crystal 133, delay slide 134 and analyzer 135.Laser 131 is used
Change in the optical parameter of transmitting laser beam, laser beam with the output signal of received antenna signal circuit 120.Such as modulated signal can
Change the optical parameter of the laser beam by modulator with signal on the modulator that acts on outside laser 131.The polarizer
132 are transformed to linearly polarized light after laser beam is incident for making.Lithium columbate crystal 133 is used to for linearly polarized light being decomposed into two vertically
Component；The phase difference that delay slide 134 is used to make two vertical components generate setting by delay；And analyzer 135 exports
Generate the optical signal of phase difference.For example, transmission situation of the signal in electrooptic modulator 130 are as follows: pass through the laser beam of modulator
Optical parameter change with signal, the incident light that laser 131 generates becomes linearly polarized light by the polarizer 132, into niobic acid
Two vertical components are decomposed into after crystalline lithium 133, postponing slide 134 using one 1/4 is that the pi/2 that two components generate is solid
Phase bit is poor, most exports modulation light through analyzer 135 afterwards.Furthermore electrooptic modulator 130 can also use collimator to believe as light
Number output interface.
First transmission fiber 210 is connect with the light output mouth of electrooptic modulator 130, is used for output optical signal.First biography
Losing fibre 210 can be multimode fibre, and the junction of electrooptic modulator 130 is provided with waterproof sealing structure namely multimode
Fiber optic enclosure and interface have good waterproof seal.
First photoelectric conversion circuit 310 is connect with the first transmission fiber 210, for converting optical signals to electric signal；Fig. 5
It is the first photoelectric conversion circuit in portable very fast transient high frequency magnetic field measuring system 10 according to an embodiment of the invention
310 schematic diagram.It is defeated that the first transmission fiber 210 of PIN photodiode L1 reception can be used in first photoelectric conversion circuit 310
The modulated optical signal entered.Optionally, the electric signal after conversion is put using two cascade OPA658 amplifier OP2, OP3
Greatly, and by selecting suitable resistance value to adjust amplification factor.
Sample circuit 330 is connect with the first photoelectric conversion circuit 310, for sampling to electric signal, to realize A/
D (Analog-digital Converter) sampling functions, such as can select double 8 high-speed a/d converters, such as MXT2001, performance that should connect
Closely or reach the following conditions: 8 sampling precisions, sampling rate for each channel reach 1.3GS/s, it is preferred to use high-speed A/D conversion circuit
And digital self-calibration technique, guarantee the high speed and high dynamic characteristic of device.A/D device inside can integrated serial interface, support
User's control changes circuit parameter, to improve performance and meet system requirements.
Signal processor 340 is connect with sample circuit 330, for handling and storing sampled data.Signal processor 340
DSP (Digital Signal Processor, digital signal processor) can be selected, such as model can be selected
The DSP of TMS320DM8167SCYG4, for maximum clock frequency up to 1.2GHz, data RAM size is 64kB, wide data bus
Degree is 32bit.
The measuring system 10 of the present embodiment can satisfy the measurement in GIS substation high frequency transient magnetic field by hardware optimization
It is required that.Due to using optical signal transmission, also avoid interfering and decaying in transmission process, so that it is accurate to provide measurement
Property, support is provided for assessment GIS substation electromagnetic compatibility level.The specific device that the measuring system 10 of the present embodiment refers to
Model is to enumerate, and those skilled in the art can according to need that selection function is identical, performance is approximate or higher similar device.
Synchronous triggering device 140 is also installed in component installation cavity, and optical signal output circuit is arranged inside, and optical signal is defeated
The antenna that circuit is predetermined frequency range out receives signal triggering, the trigger signal of output light form；Measuring system 10 further includes
Second transmission fiber 220, and optical signal output circuit, for exporting trigger signal；And signal processing circuit 300 further include:
Second photoelectric conversion circuit 320 is connect with the second transmission fiber 220, for trigger signal to be converted to electric trigger signal, Xiang Xin
Number processor 340 provides.
Fig. 6 is synchronous touching in portable very fast transient high frequency magnetic field measuring system 10 according to an embodiment of the invention
The schematic diagram of transmitting apparatus 140.Synchronous triggering device 140 uses Multipoint synchronous triggering mode, when synchronous triggering device 140 receives
When the electromagnetic wave of higher frequency band, the triode Q1 in electro-optical conversion circuit can be connected in energy, and then drives multiple light-emitting diodes
Pipe L2 generates optical signal, and optical signal is coupled to the second transmission fiber 220 and is transmitted separately to the second photoelectric conversion circuit 320, by light
Signal is converted into electric signal, and then trigger processor 340 (DSP main control chip) is started to work.
Second transmission fiber 220 and the second photoelectric conversion circuit 320 can respectively with the first transmission fiber 210 and
One photoelectric conversion circuit 310 uses multimode fibre using identical scheme namely the second transmission fiber 220, and with shielding shell
150 junction is provided with waterproof sealing structure；Second photoelectric conversion circuit 320 uses two cascade OPA658 amplifiers pair
Electric signal after conversion amplifies, and by selecting suitable resistance value to adjust amplification factor.
The portable very fast transient high frequency magnetic field measuring system 10 of the present embodiment can also include: display screen 350, external
Memory interface 360.Display screen 350 is connect with signal processor 340, the high frequency transient magnetic for being restored according to sampled signal
Field wave shape；External memorizer interface 360 is connect with signal processor 340, for connecting external memory, for data output.
Display screen 350 can be used LCD (liquid crystal display), and signal processor 340 is to the processing result of signal (such as amplitude, frequency spectrum
Deng) can also be exported by display screen 350.SD card socket can be used in external memorizer interface 360, so as to copy data
Out.
The portable very fast transient high frequency magnetic field measuring system 10 of the present embodiment can also be including power module (in figure not
It shows).220V industrial-frequency alternating current can be carried out lowering and stabilizing blood pressure and each component is given to power again by power module, such as can be by 220V work
Frequency alternating current is depressured, inversion, pressure stabilizing, is exported after filtering and is stablized 3.3V, 5V direct current.
The portable very fast transient high frequency magnetic field measuring system 10 of the present embodiment can also include set/reset circuit,
Input module (being not shown in figure) etc..Set/reset circuit is for resetting measuring system 10, to occur in failure
When recovery system 10 normal measurement.Input module can be used for user and input operation instruction, such as carry out data copy, parameter
The operation of setting.
Using the present embodiment portable very fast transient high frequency magnetic field measuring system 10 when, tested sky should be placed horizontally at
In, electromagnetic wave receiving antenna 110 is perpendicular to ground, when GIS substation carries out the high frequency transient magnetic field quilt that switch operation generates
After electromagnetic wave receiving antenna 110 receives, signal is transmitted separately to 140 He of synchronous triggering device by received antenna signal circuit 120
Electrooptic modulator 130, when synchronous triggering device 140 receives the electromagnetic wave of higher frequency band, optical signal output can be connected in energy
Triode in circuit, and then multiple light emitting diodes is driven to generate optical signal, optical signal is coupled to multimode fibre and transmits respectively
To the multiple photoelectric conversion circuits in rear end, electric signal is converted optical signals into, and then trigger processor 340 is started to work, and is adopted
The analog electrical signal that photoelectric conversion circuit exports is converted into digital signal and is supplied to signal processor 340 carrying out by sample circuit 330
Processing finally generates high frequency transient field waveform on display screen 350, and collected data is stored into SD card.By
Test, the frequency range that the measuring system 10 of the present embodiment measures up to 100kHZ~150MHz, measure amplitude range up to 0~
150A/m can effectively measure the high frequency transient magnetic field of GIS switching operation in substation generation.
So far, although those skilled in the art will appreciate that present invention has been shown and described in detail herein multiple shows
Example property embodiment still without departing from the spirit and scope of the present invention, still can according to the present disclosure directly
Determine or deduce out many other variations or modifications consistent with the principles of the invention.Therefore, the scope of the present invention is understood that and recognizes
It is set to and covers all such other variations or modifications.
Claims (10)
1. a kind of portable very fast transient high frequency magnetic field measuring system, comprising:
Electromagnetic wave receiving antenna, for receiving the very fast transient high frequency magnetic field signal of GIS switch release；
Synchronous triggering device, input terminal are connect with the tail end of the electromagnetic wave receiving antenna, for receiving in the electromagnetic wave
The reception signal of antenna within the preset frequency range in the case where, export trigger signal；
Signal processing circuit, input terminal are also connect with the tail end of the electromagnetic wave receiving antenna, for connecing the electromagnetic wave
The reception signal processing for receiving antenna is digital signal；
Signal processor is separately connected with the synchronous triggering device and the signal processing circuit, and is configured to according to institute
Trigger signal starting is stated, to handle the digital signal.
2. measuring system according to claim 1, wherein the signal processing circuit includes:
Received antenna signal circuit, input terminal are connect with the tail end of the electromagnetic wave receiving antenna, for the electromagnetic wave
The reception signal of receiving antenna carries out signal condition；
Electrooptic modulator is connect with the output end of the received antenna signal circuit, is used for the received antenna signal circuit
Output signal be modulated to optical signal；
First transmission fiber is connect, for exporting the optical signal with the light output mouth of the electrooptic modulator；
First photoelectric conversion circuit is connect with first transmission fiber, for the optical signal to be converted to electric signal；
Sample circuit is connect with the photoelectric conversion circuit and the signal processor, for adopting to the electric signal
Sample obtains the digital signal.
3. measuring system according to claim 2, wherein
Optical signal output circuit is provided in the synchronous triggering device, the optical signal output circuit is by the predeterminated frequency model
The antenna enclosed receives signal triggering, the trigger signal of output light form；
The measuring system further include:
Second transmission fiber, and the optical signal output circuit, for exporting the trigger signal；
Second photoelectric conversion circuit is connect with second transmission fiber, for the trigger signal to be converted to electricity triggering letter
Number, Xiang Suoshu signal processor provides.
4. measuring system according to claim 3, further includes:
Shield shell, interior forming member installation cavity, the received antenna signal circuit, the electrooptic modulator, the synchronization
Trigger device is installed in the component installation cavity；First transmission fiber, second transmission fiber and the electromagnetism
Wave receiving antenna is pierced by from the shielding shell.
5. measuring system according to claim 4, wherein
The shielding shell is aluminum box, and passes through ground connection, and first transmission fiber, the second transmission light
The fine and described electromagnetic wave receiving antenna is provided with waterproof sealing structure from the position for being pierced by the shielding shell.
6. measuring system according to claim 2, wherein
The electromagnetic wave receiving antenna is loop aerial, and frequency reception signal range is configured to 10kHz~500MHz.
7. measuring system according to claim 2, wherein
The received antenna signal circuit includes the quick FET amplifier of high input resistance, the non-inverting input terminal connection of the amplifier
One PIN limiter, the inverting input terminal of the amplifier are connected as voltage follower, and the output end of the amplifier connects the electric light
Modulator.
8. measuring system according to claim 2, wherein the electrooptic modulator includes:
Laser, for emitting laser beams, the optical parameter of the laser beam with the received antenna signal circuit output signal
Change；
The polarizer is transformed to linearly polarized light after the laser beam is incident for making；
Lithium columbate crystal, for the linearly polarized light to be decomposed into two vertical components；
Postpone slide, for making described two vertical components generate the phase difference set by delay；And
Analyzer, output generate the optical signal of the phase difference.
9. measuring system according to claim 3, further includes:
Display screen is connect with the signal processor, the high frequency transient field waveform for restoring according to the digital signal；
External memorizer interface is connect with the signal processor, for connecting external memory, for data output.
10. measuring system according to claim 9, wherein
First photoelectric conversion circuit, second photoelectric conversion circuit, the signal processor, the synchronous triggering dress
It sets, the display screen, the external memorizer Interface integration are on one piece of pcb board.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910538410.4A CN110174628B (en) | 2019-06-20 | 2019-06-20 | Portable ultra-fast transient high-frequency magnetic field measurement system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910538410.4A CN110174628B (en) | 2019-06-20 | 2019-06-20 | Portable ultra-fast transient high-frequency magnetic field measurement system |
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| Publication Number | Publication Date |
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| CN110174628A true CN110174628A (en) | 2019-08-27 |
| CN110174628B CN110174628B (en) | 2024-08-30 |
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| CN114019428A (en) * | 2021-11-09 | 2022-02-08 | 广东电网有限责任公司电力科学研究院 | GIL shell magnetic field measuring device |
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