CN110487773A - SF based on femtosecond laser guidance electrion6Decomposition mechanism experimental provision and method - Google Patents
SF based on femtosecond laser guidance electrion6Decomposition mechanism experimental provision and method Download PDFInfo
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- G01N21/66—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light electrically excited, e.g. electroluminescence
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Abstract
The present invention provides a kind of SF based on femtosecond laser guidance electrion6Decomposition mechanism experimental provision, it includes gas supply system, laser conduction system, gas reaction system and digital data recording system, wherein gas supply system includes air accumulator and supply air line, laser conduction system includes femtosecond laser, prism, lens and beam dump, gas reaction system includes electric discharge guide device and gas reaction pond, electric discharge guide device includes that high voltage power supply, high-field electrode include spherical lens, spectrometer and ICCD to, adjustable current-limiting resistance and conducting wire, digital data recording system.It realizes that the time of discharge process and space are controllable using femtosecond laser guidance electrion, and then passes through the SF after being discharged6Plasma spectrum studies the changing rule and SF of its ingredient6Decomposition product generation mechanism is realized to SF during electrion6The dynamic detection of decomposition product.
Description
Technical field
The present invention relates to a kind of SF based on femtosecond laser guidance electrion6Decomposition mechanism experimental provision and method belong to
In photoelectric detection technology field.
Background technique
With SF6Gas is widely used as insulation and the arc-extinguishing medium of high-voltage switch gear, SF6The decomposition mechanism of gas is ground
Study carefully personnel's concern.Researcher is to SF6The decomposition of gas is studied, and produces multiple shelf depreciation and one in 20kV or less
Secondary alternating current arc electric discharge, the decomposition product of generation may be low-fluorine sulfide.SF6Gas is under discharge process, is easily decomposed and is produced
Raw SF4、SF2And S2F2Etc. a variety of low-fluorine sulfides.If SF6Gas is free from foreign meter, and decomposing gas can composite reduction be quickly SF6。
But SF in actual running equipment6Gas contains the impurity such as micro air, moisture and mineral oil, above-mentioned low-fluorine sulfide property
It is relatively active, it is easily reacted again with oxygen, moisture etc., generates corresponding gas and solid decomposition product.
After the nineties, to SF6Component of the gas under shelf depreciation effect has carried out systematic research, and it is anti-to propose region
Model is answered, which thinks in corona discharging area SF6SF can be decomposed into4、SF5And F atom, SF4It can be with oxygen existing in gas chamber
Gas and moisture, which further react, generates SO2F2With HF etc..Researcher has studied SF under arcing6Gas component predominantly detects
To SOF2、H2S and SO2、CS2Etc. multiple gases, and confirm SOF2SO can be generated with moisture slow reaction existing in gas chamber2。
Although having carried out part SF mainly for the product design of air insulating device both at home and abroad6The simulated experiment of gas decomposition product is ground
Study carefully, obtained some qualitative conclusions, provides guidance for the insulating Design and structure optimization of equipment.But it is not run from field device
Management is set out, and SF is not obtained6The corresponding relationship of gas decomposition product and equipment fault fails to propose SF under various failure situations6
The reaction model and its feature decomposition product of gas, it is difficult to realize to SF6The comprehensive assessment of air insulating device operating status and
Maintenance, thus need to carry out deeper into comprehensive experimental study.
In recent years, the project team that China Electric Power Research Institute took the lead to GIS device gas component and its influence factor,
Such as strength of discharge, whether there is or not adsorbents and fault mode to be studied, and discovery shelf depreciation can rapidly result in SF6Gas decomposes
Generate SOF2And SO2Equal decomposition products, and decomposition product content can continue linearly to increase with discharge time.North China Power Telecommunication Network
Company establishes GIS experiment porch, to SF under local discharge scenario6Gas component is studied, and devise spine electric discharge and
Poor contact discharge test detects H in shelf depreciation2S、SO2It is main component with HF, but these measurements are all
It is that gas componant is obtained using the measurement of the methods of mass spectrum-chromatography by extracting decomposition product, can't realizes to electrion process
Middle SF6The dynamic detection of decomposition product, in order to deeper into research electrion SF6Decomposition product generation mechanism is studied under electrion
SF6Decomposition product evolution process be it is highly important, the present invention using femtosecond laser guidance electrion realize discharge process when
Between and space it is controllable, and then the SF after being discharged can be passed through6Plasma spectrum studies the changing rule and SF of its ingredient6
Decomposition product generation mechanism.
Summary of the invention
In order to overcome the drawbacks of the prior art, the present invention provides a kind of SF based on femtosecond laser guidance electrion6Point
Mechanism experiment device and method is solved, realizes that the time of discharge process and space are controllable using femtosecond laser guidance electrion,
And then pass through the SF after being discharged6Plasma spectrum studies the changing rule and SF of its ingredient6Decomposition product generation mechanism, it is real
Now to SF during electrion6The dynamic detection of decomposition product.
In order to achieve the above object, the present invention is achieved by the following technical solutions:
Specifically, the present invention provides a kind of SF based on femtosecond laser guidance electrion6Decomposition mechanism experimental provision,
Including gas supply system, laser conduction system, gas reaction system and digital data recording system；
The gas supply system reacts required gas for providing, and the gas supply system includes air accumulator, flow
Meter and supply air line, gas are flowed out from air accumulator, flow through flowmeter control flow through supply air line, then pass through gas reaction system
In air inlet pipe enter gas reaction system；
The laser conduction system is used to guiding laser beam into gas reaction pond specified spatial position, and forms light
Silk, the laser conduction system include femtosecond laser, prism, lens and beam dump, and femtosecond laser generates short-pulse laser,
Short-pulse laser changes transmission direction through prism, then passes through lens focus laser beam so that short-pulse laser is in gas reaction system
Chevilled silk is formed in the gas reaction pond of system, what beam dump was emitted in the gas reaction pond for absorbing gas reaction system swashs
Light；
The gas reaction system is for realizing SF6Decomposition of the gas under electrion environment, the gas reaction system
System includes electric discharge guide device and gas reaction pond, and the electric discharge guide device includes high voltage power supply, high-field electrode to, adjustable limit
Leakage resistance and conducting wire, electric discharge guide device form closed circuit and generate high-voltage electricity, and the adjustable current-limiting resistance is for accurately controlling
Discharge energy processed, the high voltage power supply pass through conducting wire in the point of high-field electrode pair for generating direct current nanosecond pulse high pressure
End part generates electric discharge, the SF in gas reaction pond6Gas will decompose in such circumstances；
The digital data recording system for recording data, the digital data recording system include spherical lens, spectrometer and
ICCD, the spherical lens is for collecting SF6Gas decomposition product spectral signal, the spectrometer and ICCD are for recording SF6Deng from
The spectral signature of daughter；
When experiment, air inlet pipe valve is opened, the gas of gas supply system supply is passed through gas reaction pond by air inlet pipe,
The high-voltage electricity that electric discharge guide device generates is guided the specified sky to gas reaction pond by the chevilled silk that laser conduction system generates
Meta position puts electricity, after digital data recording system completes data collection, opens outlet tube valve, is passed through SF6Gas is by the gas after reaction
Body is discharged through escape pipe.
Preferably, the supply air line is silicone tube, and the silicone tube includes the first silicone tube and the second silicone tube.
Preferably, the air accumulator includes the first air accumulator and the second air accumulator, and the flowmeter includes first flowmeter
And second flowmeter, the gas outlet of first air accumulator connect first flowmeter, second storage by means of the first silicone tube
The gas outlet of gas tank connects second flowmeter by means of the second silicone tube, the first flowmeter and second flowmeter by means of into
Tracheae connects the entrance in the gas reaction pond, and close gas reaction pond inlet is provided with air inlet pipe in the air inlet pipe
Valve.
Preferably, the exit in the gas reaction pond is connected with escape pipe, and the escape pipe is close to the gas reaction
Pond exit is provided with outlet tube valve.
Preferably, the prism includes the first prism and the second prism, and first prism and the second prism are right angle
The right angle of prism, first prism and the second prism is oppositely arranged and is located in a straight line.
Preferably, the lens are spherical lens.
Preferably, the high-field electrode is to including the first high-field electrode and the second high-field electrode, first high-field electrode
The positive and negative anodes of high voltage power supply are separately connected with the second high-field electrode, to form closed circuit, the first high-field electrode and second high
The distance between piezoelectricity pole is greater than free striking distance.
Preferably, the distance between first high-field electrode and the second high-field electrode are 5-20mm.
Preferably, the present invention also provides a kind of SF based on femtosecond laser guidance electrion6Decomposition mechanism experimental provision
Experimental method comprising following steps:
S1: opening air inlet pipe valve and outlet tube valve, controls reaction gas by flowmeter and is passed through gas with constant flow rate
Air inlet pipe valve and outlet tube valve are closed after gas is full of reaction tank in precursor reactant pond；
S2: opening femtosecond laser, and femtosecond laser generates short-pulse laser, and by the first prism, the second prism and lens
Chevilled silk is formed in gas reaction pond, reaches beam dump later；
S3: opening digital data recording system, and waiting step S4 electric discharge records SF after starting6Plasma light spectrum signature；
S4: opening high voltage power supply, adjustable current-limiting resistance control discharge energy is adjusted, by the first high-field electrode and the second high pressure
Electrode is horizontally placed near chevilled silk, and the tip of the first high-field electrode and the second high-field electrode, which is easy to guide as close as possible to chevilled silk, puts
Electricity, the distance between the first high-field electrode and the second high-field electrode are greater than free striking distance；
S5: outlet tube valve is opened after experiment and is passed through SF6By the gas discharge after reaction；
S6: spherical lens collects SF6Gas decomposition product spectral signal, spectrometer and ICCD are for recording SF6Plasma
After spectral signature, spectral signal and spectral signature are analyzed.
Preferably, spectrograph slit and chevilled silk are placed in parallel in step S6, one-dimensional space resolved spectroscopy can be obtained.
Compared with prior art, the invention has the following advantages:
(1) present invention using femtosecond laser have it is unique at silk feature and at silk generate weak plasma channel draw
Electrion is led, realizes that the time of electrion and space are controllable；
(2) present invention realizes SF during electrion6The dynamic of decomposition product measures.
Detailed description of the invention
Fig. 1 is the SF of femtosecond laser guidance electrion of the invention6Decomposition mechanism experimental provision system block diagram；
Fig. 2 is the SF of femtosecond laser guidance electrion of the invention6Decomposition mechanism experimental provision system schematic；
Fig. 3 a is the free discharge schematic diagram in embodiment；
Fig. 3 b is the electrion schematic diagram in embodiment under femtosecond laser guidance；And
Fig. 4 is the SF under electrion state of the invention6Decomposition product spectrum.
In figure, part appended drawing reference is as follows:
The first high-field electrode of 1-；12-the second high-field electrode；2-escape pipes；3-outlet tube valves；4-gas reactions
Pond；5-lens；The first prism of 6-, the 7-the second prism；8-femtosecond lasers；9-high voltage power supplies；10-adjustable current-limiting resistances；
11-conducting wires；13-beam dumps；14-air inlet pipe；The first silicone tube of 15-, the 19-the second silicone tube；16- first flow
Meter；20-second flowmeters；The first air accumulator of 17-；The second air accumulator of 21-；18-air inlet pipe valves；22-spherical lenses；
23-spectrometers；24—ICCD.
Specific embodiment
Below with reference to the attached drawing exemplary embodiment that the present invention will be described in detail, feature and aspect.It is identical attached in attached drawing
Icon note indicates element functionally identical or similar.Although the various aspects of embodiment are shown in the attached drawings, unless special
It does not point out, it is not necessary to attached drawing drawn to scale.
SF based on femtosecond laser guidance electrion of the invention6The system block diagram of decomposition mechanism experimental provision, such as Fig. 1
It is shown comprising gas supply system 100, laser conduction system 101, electric discharge guide device 102, gas reaction pond 4 and data
Record system 103, wherein electric discharge guide device 102 and gas reaction pond 4 collectively constitute gas reaction system.Gas supply system
System 100 reacts required gas for providing；Laser conduction system 101 is used to specify spatial position to be formed in gas reaction pond 4
Chevilled silk；Guide device 102 of discharging is used to generate electric discharge in gas reaction pond 4；Gas reaction pond 4 is used as gas reaction place；
Digital data recording system 103 is used for spectra re-recorded information.
As shown in Fig. 2, wherein gas supply system include the first silicone tube 15, the second silicone tube 19, first flowmeter 16,
Second flowmeter 20, the first air accumulator 17 and the second air accumulator 21.
First flowmeter 16 and second flowmeter 20 are stored up for controlling gas flow, gas from the first air accumulator 17 and second
Gas tank 21 flows out, and flows through first flowmeter 16 through the first silicone tube 15 and the second silicone tube 19 respectively and second flowmeter 20 controls
Flow, then gas reaction system is entered by the air inlet pipe 14 in gas reaction system.Air inlet pipe 14 and escape pipe 2 are silica gel
Pipe.
Laser conduction system 101 includes femtosecond laser 8, the first prism 6 and the second prism 7, lens 5 and beam dump
13。
Gas reaction system includes electric discharge guide device 102, gas reaction pond 4, air inlet pipe 14, escape pipe 2, air inlet pipe valve
Door 18 and outlet tube valve 3.
Femtosecond laser 8 changes transmission direction through the second prism 7 and the first prism 6 for generating short-pulse laser, laser, then
By 5 focused laser beam of lens so that short-pulse laser forms chevilled silk in gas reaction pond；Beam dump 13 is for inhaling
The laser being emitted in getter precursor reactant pond.
Wherein, the first prism 6 and the second prism 7 are right-angle prism；The right angle of first prism and the second prism is oppositely arranged
And it is located in a straight line.Lens 5 are spherical lens.
Gas reaction pond 4 is quartz material, and shape is cuboid, having a size of 15cm × 15cm × 10cm, quartzy gas cell
Inside it is filled with SF6Equal reaction gas.
Guide device 102 of discharging includes high voltage power supply 9, the first high-field electrode 1 and the second high-field electrode 12, adjustable current limliting electricity
Resistance 10 and conducting wire 11, electric discharge guide device forms closed circuit, for generating high-voltage electricity, wherein adjusting adjustable current-limiting resistance 10 can
Accurate control discharge energy；High voltage power supply 9 passes through conducting wire 11 in the first high-voltage electricity for generating direct current nanosecond pulse high pressure
The tip portion of pole 1 and the second high-field electrode 12 generates electric discharge, the SF in gas reaction pond 46Gas will occur in such circumstances
It decomposes.
First high-field electrode 1 and the second high-field electrode 12 are located inside gas reaction pond.First high-field electrode 1 and second is high
Piezoelectricity pole 12 is separately connected the positive and negative anodes of high voltage power supply, so that closed circuit is formed, the first high-field electrode 1 and the second high-field electrode
The distance between 12 are greater than free striking distance.
Digital data recording system 103 includes spherical lens 22, spectrometer 23 and ICCD24.Spherical lens 22 is for collecting SF6
Gas decomposition product signal.Spectrometer 23 and ICCD24 are for recording SF6Plasma light spectrum signature, by spectrograph slit and chevilled silk
It can be obtained one-dimensional space resolved spectroscopy in parallel.ICCD is to pass through optical fiber and the board-like image intensifier phase of electron tube or microchannel
CCD camera even.
Gas reaction system realizes SF6Decomposition of the gas under electrion environment when experiment, opens air inlet pipe valve
18, the SF of gas supply system supply6Gas is passed through gas reaction pond 4, the height that electric discharge guide device generates by air inlet pipe 14
Piezoelectricity, which is guided by the chevilled silk that laser conduction system generates to designated position, to discharge, and after digital data recording system completes data collection, beats
Tracheae valve 3 is outputed, SF is passed through6Gas after reaction is discharged through escape pipe 2.
The present invention also provides a kind of SF based on femtosecond laser guidance electrion6The experiment side of decomposition mechanism experimental provision
Method comprising following steps:
S1: opening air inlet pipe valve and outlet tube valve, controls reaction gas by flowmeter and is passed through gas with constant flow rate
Air inlet pipe valve and outlet tube valve are closed after gas is full of reaction tank in precursor reactant pond；
S2: opening femtosecond laser, and femtosecond laser generates short-pulse laser, and by the first prism, the second prism and lens
Chevilled silk is formed in gas reaction pond, reaches beam dump later；
S3: opening digital data recording system, and waiting step S4 electric discharge records SF after starting6Plasma light spectrum signature；
S4: opening high voltage power supply, adjustable current-limiting resistance control discharge energy is adjusted, by the first high-field electrode and the second high pressure
Electrode is horizontally placed near chevilled silk, and the tip of the first high-field electrode and the second high-field electrode, which is easy to guide as close as possible to chevilled silk, puts
Electricity, the distance between the first high-field electrode and the second high-field electrode are greater than free striking distance；
S5: outlet tube valve is opened after experiment and is passed through SF6By the gas discharge after reaction；
S6: spherical lens collects SF6Gas decomposition product spectral signal, spectrometer and ICCD are for recording SF6Plasma
After spectral signature, spectral signal and spectral signature are analyzed.
Below to use apparatus of the present invention to SF6It is illustrated for the mechanism study under oxygen atmosphere:
Device is as shown in Fig. 2, the first air accumulator 17 stores SF6Gas, the second air accumulator 21 store gas O2, open air inlet
Tube valve 18 and outlet tube valve 3 control SF using first flowmeter 166Enter gas reaction pond 4 with the flow velocity of 0.1L/min,
O is controlled using second flowmeter 20 simultaneously2Enter gas reaction pond 4 with the flow velocity of 0.01L/min, finally closes air inlet pipe valve
18 and outlet tube valve 3.
Femtosecond laser is opened, femtosecond laser fundamental wave output wavelength is 800nm, pulse duration 45fs, pulse energy
It is set as 6.36mJ, laser successively changes transmission direction through the second prism 7 and the first prism 6, then passes through 5 (f=of spherical lens
It 300mm) focuses in gas reaction pond 4 and forms chevilled silk, finally get on line receiver 13.
It opens spectrometer 23 and ICCD24 waiting tests after starting and records information.
High voltage power supply 9, supply voltage 12kV, frequency 10Hz, rising edge and failing edge 50ns are opened, adjustable current limliting electricity is passed through
11 control discharge energy of resistance, the first high-field electrode 1 in gas reaction pond 4 and the second high-field electrode 12 are placed near chevilled silk,
Away from 10mm is set as, in this way be easy guidance electric discharge and electrode to the distance between be greater than free striking distance, femtosecond laser guide
Electric discharge figure is as shown in Figure 3b；Spectrograph slit and chevilled silk are arranged in parallel, collect SF using spherical lens 22 (f=100mm)6Point
Object signal is solved, and image formation to spectrometer 23, spectrometer 23 and ICCD24 are recorded into the plasma spectrometry after electric discharge is decomposed
Feature；Outlet tube valve 3 is finally opened, SF is passed through6Gas after reaction is discharged by escape pipe 2.
Similarly, when not being passed through O2When gas, pure SF can be carried out6Gas electrolysis research.
Fig. 3 a is the free discharge schematic diagram in the present embodiment, and as can be seen from the figure discharging has randomness in space,
Fig. 3 b is the electrion schematic diagram in the present embodiment under femtosecond laser guidance, and electric discharge occurs to swash in femtosecond as we can see from the figure
Near light light beam.The electrion room and time demonstrated under femtosecond laser guidance is controllable therefore stable in spatial position
The plasma spectrum of discharge process can be observed under state with spectrometer 23.
Fig. 4 is the SF under the electrion state observed6Spectrum and tie element, top illustration are ICCD24 shooting
SF6The one-dimensional space resolved spectroscopy image reacted near chevilled silk, by SF6And SF6+O2Known to image comparison: by illustration observable
To SF6+O2Image compares pure SF at wavelength 777nm or so place6Color is deeper for image, illustrates the original generated after electric discharge is decomposed
Sub-light spectral intensity is higher.
The spectrogram of lower section is spectrogram after MATLAB data processing in Fig. 4, horizontal, ordinate respectively represent wavelength and
Intensity, as shown in Figure 4 SF6+O2Each atom spectrum intensity after electric discharge decomposition is than pure SF6Each atom spectrum after electric discharge decomposition
Intensity is high, this is completely the same with information shown in illustration in Fig. 4；And S atom is produced when wavelength is 464nm and 796nm, it was demonstrated that
SF6In O2By producing novel substance during femtosecond laser guidance electrion under environment.The experiment proves that apparatus of the present invention are carried out
Femtosecond laser guides electrion to study SF6The feasibility of decomposition mechanism.
Finally, it should be noted that above-described embodiments are merely to illustrate the technical scheme, rather than to it
Limitation；Although the present invention is described in detail referring to the foregoing embodiments, those skilled in the art should understand that:
It can still modify to technical solution documented by previous embodiment, or to part of or all technical features into
Row equivalent replacement；And these modifications or substitutions, it does not separate the essence of the corresponding technical solution various embodiments of the present invention technical side
The range of case.
Claims (10)
1. a kind of SF based on femtosecond laser guidance electrion6Decomposition mechanism experimental provision, it is characterised in that: it includes gas
Supply system, laser conduction system, gas reaction system and digital data recording system；
The gas supply system for provide react needed for gas, the gas supply system include air accumulator, flowmeter and
Supply air line, gas are flowed out from air accumulator, flow through flowmeter control flow through supply air line, then by gas reaction system
Air inlet pipe enters gas reaction system；
The laser conduction system is used to guiding laser beam into gas reaction pond specified spatial position, and forms chevilled silk,
The laser conduction system includes femtosecond laser, prism, lens and beam dump, and femtosecond laser generates short-pulse laser, short
Pulse laser changes transmission direction through prism, then passes through lens focus laser beam so that short-pulse laser is in gas reaction system
Gas reaction pond in form chevilled silk, beam dump be used to absorb be emitted in the gas reaction pond of gas reaction system it is sharp
Light；
The gas reaction system is for realizing SF6Decomposition of the gas under electrion environment, the gas reaction system include
It discharges guide device and gas reaction pond, the electric discharge guide device includes high voltage power supply, high-field electrode to, adjustable current-limiting resistance
And conducting wire, electric discharge guide device form closed circuit and generate high-voltage electricity, the adjustable current-limiting resistance is for accurately controlling electric discharge
Energy, the high voltage power supply pass through conducting wire in the tip portion of high-field electrode pair for generating direct current nanosecond pulse high pressure
Generate electric discharge, the SF in gas reaction pond6Gas will decompose in such circumstances；
For the digital data recording system for recording data, the digital data recording system includes spherical lens, spectrometer and ICCD, institute
Spherical lens is stated for collecting SF6Gas decomposition product spectral signal, the spectrometer and ICCD are for recording SF6Plasma
Spectral signature；
When experiment, air inlet pipe valve is opened, the gas of gas supply system supply is passed through gas reaction pond by air inlet pipe, discharges
The high-voltage electricity that guide device generates is guided by the chevilled silk that laser conduction system generates to the designated space position inside gas reaction pond
Electricity is put, after digital data recording system completes data collection, outlet tube valve is opened, is passed through SF6Gas passes through the gas after reaction
Escape pipe discharge.
2. the SF according to claim 1 based on femtosecond laser guidance electrion6Decomposition mechanism experimental provision, feature
Be: the supply air line is silicone tube, and the silicone tube includes the first silicone tube and the second silicone tube.
3. the SF according to claim 2 based on femtosecond laser guidance electrion6Decomposition mechanism experimental provision, feature
Be: the air accumulator includes the first air accumulator and the second air accumulator, and the flowmeter includes first flowmeter and second flow
The gas outlet of meter, first air accumulator connects first flowmeter, the outlet of second air accumulator by means of the first silicone tube
Mouth connects second flowmeter by means of the second silicone tube, and the first flowmeter connects institute by means of air inlet pipe with second flowmeter
The entrance in gas reaction pond is stated, close gas reaction pond inlet is provided with air inlet pipe valve in the air inlet pipe.
4. the SF according to claim 3 based on femtosecond laser guidance electrion6Decomposition mechanism experimental provision, feature
Be: the exit in the gas reaction pond is connected with escape pipe, and the escape pipe is set close to gas reaction pond exit
It is equipped with outlet tube valve.
5. the SF according to claim 1 based on femtosecond laser guidance electrion6Decomposition mechanism experimental provision, feature
Be: the prism includes the first prism and the second prism, and first prism and the second prism are right-angle prism, and described the
The right angle of one prism and the second prism is oppositely arranged and is located in a straight line.
6. the SF according to claim 1 based on femtosecond laser guidance electrion6Decomposition mechanism experimental provision, feature
Be: the lens are spherical lens.
7. the SF according to claim 1 based on femtosecond laser guidance electrion6Decomposition mechanism experimental provision, feature
Be: the high-field electrode is to including the first high-field electrode and the second high-field electrode, first high-field electrode and the second high pressure
Electrode is separately connected the positive and negative anodes of high voltage power supply, so that closed circuit is formed, between the first high-field electrode and the second high-field electrode
Distance be greater than free striking distance.
8. the SF according to claim 6 based on femtosecond laser guidance electrion6Decomposition mechanism experimental provision, feature
Be: the distance between first high-field electrode and the second high-field electrode are 5-20mm.
9. a kind of SF based on femtosecond laser guidance electrion6The experimental method of decomposition mechanism experimental provision, it is characterised in that:
Itself the following steps are included:
S1: opening air inlet pipe valve and outlet tube valve, and controlling reaction gas by flowmeter, with constant flow rate to be passed through gas anti-
Ying Chi closes air inlet pipe valve and outlet tube valve after gas is full of reaction tank；
S2: opening femtosecond laser, and femtosecond laser generates short-pulse laser, and by the first prism, the second prism and lens in gas
Chevilled silk is formed in precursor reactant pond, reaches beam dump later；
S3: opening digital data recording system, and waiting step S4 electric discharge records SF after starting6Plasma light spectrum signature；
S4: opening high voltage power supply, adjustable current-limiting resistance control discharge energy is adjusted, by the first high-field electrode and the second high-field electrode
It being horizontally placed near chevilled silk, the tip of the first high-field electrode and the second high-field electrode is easy to guide electric discharge as close as possible to chevilled silk,
The distance between first high-field electrode and the second high-field electrode are greater than free striking distance；
S5: outlet tube valve is opened after experiment and is passed through SF6By the gas discharge after reaction；
S6: spherical lens collects SF6Gas decomposition product spectral signal, spectrometer and ICCD are for recording SF6The spectrum of plasma
After feature, spectral signal and spectral signature are analyzed.
10. experimental method according to claim 8, it is characterised in that: in step S6 that spectrograph slit is parallel with chevilled silk
It places, one-dimensional space resolved spectroscopy can be obtained.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114689898A (en) * | 2022-03-30 | 2022-07-01 | 中国人民解放军国防科技大学 | Device and method for observing femtosecond laser filamentation impact cloud droplets |
| CN115598479A (en) * | 2022-10-26 | 2023-01-13 | 沈阳工业大学（Cn） | Arc three-dimensional high-speed imaging test device and method |
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| CN115598479A (en) * | 2022-10-26 | 2023-01-13 | 沈阳工业大学（Cn） | Arc three-dimensional high-speed imaging test device and method |
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