CN109444458A - A kind of device and method based on femtosecond laser guidance discharge measuring flow field velocity - Google Patents
A kind of device and method based on femtosecond laser guidance discharge measuring flow field velocity Download PDFInfo
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- CN109444458A CN109444458A CN201811401161.6A CN201811401161A CN109444458A CN 109444458 A CN109444458 A CN 109444458A CN 201811401161 A CN201811401161 A CN 201811401161A CN 109444458 A CN109444458 A CN 109444458A
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- flow field
- measured
- laser
- plasma channel
- chevilled silk
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P5/00—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft
- G01P5/26—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft by measuring the direct influence of the streaming fluid on the properties of a detecting optical wave
Abstract
A kind of device and method based on femtosecond laser guidance discharge measuring flow field velocity of the present invention, device includes flow field to be measured, femto-second laser, high voltage power supply, condenser lens, slr camera and computer, the laser of the femto-second laser outgoing is incident to flow field to be measured after the condenser lens forms chevilled silk, the high voltage power supply is drawn just, negative electrode is placed in the chevilled silk both ends in flow field to be measured, the slr camera is placed in flow field side to be measured for shooting luminous signal, the computer finally obtains flow field velocity to be measured to carry corresponding software progress photo processing.The invention belongs to non-contact optical speed measurement methods, solve the problems such as signal is weaker, and measurement scale is smaller when some measuring methods measure；By thousands of times of measuring signal enhanced strength, the measurement range of this technology is improved, and then the flow field situation in some complexity can be applied.
Description
Technical field
The invention belongs to flow field, electrion and laser technology fields, and in particular to a kind of to be drawn using femtosecond laser at silk
Lead the technology of electrion measurement flow field velocity.
Background technique
Speed is the Important Parameters for describing flow field, and the measurement method of speed can substantially be divided into two kinds: traditional speed is surveyed
Amount method mainly has Pitot tube to test the speed [1] and hot-wire anemometer [2] two ways.Probe need to be placed in tested flow field by such method
It in the middle, is typical contact type measurement, the main problem of contact type measurement is that meeting stream field generates interference, secondly multiple in high temperature etc.
It is difficult to apply under heterocycle border.With the development of laser technology, the contactless velocity measuring technique based on laser is rapidly developed.Swash
Optical tests technology can be applied in many special environment, for example, combustion flame field, acutely chemically reacts air-flow and high intensity
Turbulent flow etc..
Molecular Tracing test the speed (Molecular Tagging Velocimetry, MTV) [3] be common non-intrusion type swash
Light velocity measuring technique, MTV technology need to usually introduce seed molecule in flow field, or utilize two beam laser, and beam of laser label shows
Track molecule, another beam of laser are labeled molecule after reading certain time interval, are displaced by calculating tracer molecule in certain time
To obtain velocity information.This flow field speed testing mode needs two sets of laser light sources, and system is complex.In recent years, femtosecond laser
Electron excitation labelling technique (Femtosecond Laser Electronic Excitation Tagging, FLEET) [4] hair
Exhibition is got up, and FLEET can only realize the function of label and reading with beam of laser.Likewise, there is also some for FLEET technology
Problem, the fluorescence signal after molecule is excited is too weak, and the duration is shorter, so that FLEET technology is needed using with increasing
The ICCD camera of strong device can just take fluorescence signal, and fluorescence signal duration short-range missile causes the technology to be only applicable to high speed
Flow field.
Under atmospheric pressure, the plasma that electrion generates can replace the molecule for being laser marked excitation, apply
Field [5] are tested the speed in tracer.But electric discharge time and spatial position can not determine, so only rely on electric discharge test the speed by
To very big limitation.The present invention proposes a kind of novel speed testing mode: femtosecond laser guides electrion speed-measuring method.Femtosecond laser
Self-focusing effect can produce diameter in the chevilled silk of hundred micron dimensions, and chevilled silk can make the air ionization on its path, and then form one
The weak plasma channel of item.When high-field electrode is close to chevilled silk, i.e., bootable high-voltage electricity discharges along at the Silk Road diameter, generation length length,
The strong plasma channel of signal.By the general camera without booster it is the displacement of recordable plasma channel, and pushes away
Export velocity information.
[1] Coleman La Leier Mark Lewis-Francis；Kai Erle Meier Wen Laerfu Pitot tube [P] China is specially
Benefit: CN86300285,1987-02-10.
[2] Liu Zutang, Zhao Minsheng, Li Futian hotting mask probe and its Jiangsu rating device [P]: CN85205583,1986-
11-26.
[3]Mainyu E A,láser.Molecular Tagging Velocimetry[M].Flow
Visualization:Techniques and Examples.2005:73-92.
[4]Michael J B,Edwards M R,Dogariu A,et al.Femtosecond laser
electronic excitation tagging for quantitative velocity imaging in air[J]
.Applied Optics,2011,50(26):5158-62.
[5]Sun Z W,Zhu J J,Li Z S,et al.Optical diagnostics of a gliding arc.
[J].Optics Express,2013,21(5):6028-44.
Summary of the invention
Purpose of the invention is to overcome the shortcomings in the prior art, provides a kind of based on femtosecond laser guidance electric discharge survey
The device and method of flow field velocity is measured, the invention belongs to non-contact optical speed measurement methods, solve some optical measurement
The problems such as signal is weaker when method measures, and measurement scale is smaller；By thousands of times of measuring signal enhanced strength, this technology is improved
Measurement range, and then the flow field situation in some complexity can be applied.
The purpose of the present invention is what is be achieved through the following technical solutions:
A kind of device based on femtosecond laser guidance discharge measuring flow field velocity, including flow field to be measured, femto-second laser, height
The laser of voltage source, condenser lens, slr camera and computer, the femto-second laser outgoing forms light through the condenser lens
Flow field to be measured is incident to after silk, the positive and negative electrode that the high voltage power supply is drawn is placed in the chevilled silk both ends in flow field to be measured, described
Slr camera is placed in flow field side to be measured and carries out photo to carry corresponding software for shooting luminous signal, the computer
Processing finally obtains flow field velocity to be measured.
A method of discharge measuring flow field velocity is guided based on femtosecond laser, comprising the following steps:
(1) laser of femto-second laser outgoing focuses to form chevilled silk and be incident to flow field to be measured by condenser lens, induces
Weak plasma channel is generated, is recorded by slr camera and using the position mark as the initial position of plasma channel；
(2) plasma channel that femtosecond laser focuses generation can be mobile with flow field, by set time t, plasma
Channel, which is passed by, is displaced S, a pair of positive and negative is drawn from high voltage power supply, along the chevilled silk two being placed in flow field to be measured at silk direction
End；
(3) high voltage power supply is opened, high pressure is passed through to positive and negative electrode, high-voltage electricity can be hit along the path of plasma channel
Atmospherical discharges are worn, the chevilled silk of an incandescent is formed, it is equivalent while generating incandescent chevilled silk by the electric discharge of slr camera recording electrode
The end position of plasma channel has been obtained in label；
(4) it is calibrated, is obtained using the position that Matlab software marks chevilled silk in slr camera photo in a computer
To the initial position of plasma channel and the space length of end position, the time interval that binding plasma channel moves is
The velocity information in flow field to be measured can be obtained.
Compared with prior art, the beneficial effects brought by the technical solution of the present invention are as follows:
1. the present invention is tested the speed using femtosecond laser guidance electrion, non-contact measurement is realized, and will
Optical signal intensity enhances thousands of times, increases the application range to test the speed.
2. the present invention can be used as signal collection device using the common slr camera without booster and realize tachometric survey.
Detailed description of the invention
Fig. 1 is structural schematic diagram of the invention.
Appended drawing reference: 1- femto-second laser, 2- high voltage power supply, 3- condenser lens, 4- slr camera, the flow field to be measured 5-
Specific embodiment
The invention will be further described with reference to the accompanying drawing.
As shown in Figure 1, a kind of device based on femtosecond laser guidance discharge measuring flow field velocity, including femto-second laser 1,
High voltage power supply 2, condenser lens 3, slr camera 4, flow field to be measured 5 and computer, what femto-second laser 1 was emitted in the present embodiment swashs
Light successively passes through refracting telescope and condenser lens 3, and laser is incident to flow field 5 to be measured, high voltage power supply after condenser lens 3 forms chevilled silk
2 positive and negative electrodes drawn are placed in the chevilled silk both ends in flow field 5 to be measured, and slr camera 4 is placed in flow field side to be measured for clapping
It takes the photograph and the displacement for recording the signal in the set time is tested the speed to realize.
The working principle of the device is as follows: the chevilled silk that femtosecond laser self-focusing is formed being introduced into flow field to be measured, self-focusing
Effect makes along being ionized to form a weak plasma channel at silk direction surrounding air, and plasma channel can be with flow field
Movement.I.e. in velocity measuring technique, femtosecond laser is focused into silk and is equivalent to the initial position for having marked plasma channel.Along at silk
Direction, the suitable position close to chevilled silk both ends arrange a pair of of high-field electrode.By one section of regular time, work as plasma channel
After moving a distance with flow field, high pressure is added to electrode, high-voltage electricity can puncture atmospherical discharges along the path of plasma channel,
Form the chevilled silk of an incandescent.I.e. in velocity measuring technique, the chevilled silk of the generation incandescent of electrode discharge, which is equivalent to, is marked plasma
The end position in body channel.It can recorde the spatial position twice of plasma channel using slr camera, and obtain space
The regular time of binding plasma channel movement, velocity information can be obtained in displacement information.
It is illustrated with reference to Fig. 1 a specific embodiment of the invention method.The laser that femto-second laser 1 issues passes through condenser lens
3 focusing form chevilled silk and it are made to pass through flow field 5 to be measured, and induced with laser generates weak plasma channel, the plasma channel
Position as initial position.This process is equivalent in velocity measuring technique, and femtosecond laser is focused to form chevilled silk and be marked and be tested the speed
Initial position.Femtosecond laser focuses the plasma channel generated can be mobile with flow field, and by set time t, plasma is logical
Road, which is passed by, is displaced S, draws a pair of positive and negative from high voltage power supply 2, along at silk direction, close to chevilled silk and is placed in into silk both ends,
Position as far as possible far from flow field to be measured, while paying attention to that chevilled silk is avoided directly to beat on the electrode.Add high pressure on the electrode at this time, it is high
Piezoelectricity can puncture atmospherical discharges along the path of plasma channel, form the chevilled silk of an incandescent.I.e. in velocity measuring technique, electricity
The chevilled silk of the generation incandescent of pole electric discharge is equivalent to the end position that plasma channel is marked.Chevilled silk is recorded using slr camera
Beginning, last bit set, on Matlab software in single-lens reflex camera photo chevilled silk mark position calibrate, obtain plasma channel
Begin, the space length that last bit is set, the velocity information in flow field to be measured can be obtained in the time interval of binding plasma channel movement.
The present invention is not limited to embodiments described above.Above the description of specific embodiment is intended to describe and say
Bright technical solution of the present invention, the above mentioned embodiment is only schematical, is not restrictive.This is not being departed from
In the case of invention objective and scope of the claimed protection, those skilled in the art may be used also under the inspiration of the present invention
The specific transformation of many forms is made, within these are all belonged to the scope of protection of the present invention.
Claims (2)
1. a kind of device based on femtosecond laser guidance discharge measuring flow field velocity, including flow field to be measured, which is characterized in that also wrap
Femto-second laser, high voltage power supply, condenser lens, slr camera and computer are included, the laser of the femto-second laser outgoing is through institute
It states after condenser lens forms chevilled silk and is incident to flow field to be measured, the positive and negative electrode that the high voltage power supply is drawn is placed in flow field to be measured
Interior chevilled silk both ends, the slr camera are placed in flow field side to be measured for shooting luminous signal, and the computer is to take
It carries corresponding software progress photo processing and finally obtains flow field velocity to be measured.
2. a kind of method based on femtosecond laser guidance discharge measuring flow field velocity, is based on claim 1 described device, feature
It is, comprising the following steps:
(1) laser of femto-second laser outgoing focuses to form chevilled silk and be incident to flow field to be measured by condenser lens, and induction generates
Weak plasma channel is recorded by slr camera and using the position mark as the initial position of plasma channel；
(2) plasma channel that femtosecond laser focuses generation can be mobile with flow field, by set time t, plasma channel
It passes by and is displaced S, a pair of positive and negative is drawn from high voltage power supply, along the chevilled silk both ends being placed in flow field to be measured at silk direction；
(3) high voltage power supply is opened, high pressure is passed through to positive and negative electrode, high-voltage electricity can puncture empty along the path of plasma channel
Gas electric discharge, forms the chevilled silk of an incandescent, while generating incandescent chevilled silk by the electric discharge of slr camera recording electrode, is equal to mark
The end position of plasma channel is remembered；
(4) it is calibrated, is obtained using the position that Matlab software marks chevilled silk in slr camera photo in a computer
The time interval of the initial position of plasma channel and the space length of end position, the movement of binding plasma channel can obtain
To the velocity information in flow field to be measured.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111812354A (en) * | 2020-06-16 | 2020-10-23 | 天津大学 | Flow field velocity measurement system based on high-voltage discharge |
| EP3767306A1 (en) * | 2019-07-15 | 2021-01-20 | The Boeing Company | Method and system for collecting air data using a laser-induced plasma channel |
| CN112525494A (en) * | 2020-11-24 | 2021-03-19 | 中国科学院上海光学精密机械研究所 | Device and method for improving and measuring pointing stability of high repetition frequency ultrafast laser filament |
| CN113009178A (en) * | 2021-02-18 | 2021-06-22 | 上海交通大学 | Flow velocity measurement system based on sliding electric arc |
| CN113640542A (en) * | 2021-08-10 | 2021-11-12 | 中国人民解放军国防科技大学 | Sliding arc discharge-based speed measurement device and method for scramjet engine combustion chamber |
| 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 |
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| CN105698687A (en) * | 2016-04-12 | 2016-06-22 | 中国科学院上海光学精密机械研究所 | Femtosecond laser plasma channel length measuring device and method |
| CN108761126A (en) * | 2018-03-16 | 2018-11-06 | 天津大学 | A kind of speed measuring device and method based on femtosecond laser photochemical luminescence |
| CN209132298U (en) * | 2018-11-22 | 2019-07-19 | 天津大学 | A kind of device based on femtosecond laser guidance discharge measuring flow field velocity |
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| CN108761126A (en) * | 2018-03-16 | 2018-11-06 | 天津大学 | A kind of speed measuring device and method based on femtosecond laser photochemical luminescence |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3767306A1 (en) * | 2019-07-15 | 2021-01-20 | The Boeing Company | Method and system for collecting air data using a laser-induced plasma channel |
| US20210018529A1 (en) * | 2019-07-15 | 2021-01-21 | The Boeing Company | Method and system for collecting air data using a laser-induced plasma channel |
| US11828771B2 (en) * | 2019-07-15 | 2023-11-28 | The Boeing Company | Method and system for collecting air data using a laser-induced plasma channel |
| CN111812354A (en) * | 2020-06-16 | 2020-10-23 | 天津大学 | Flow field velocity measurement system based on high-voltage discharge |
| CN111812354B (en) * | 2020-06-16 | 2021-12-03 | 天津大学 | Flow field velocity measurement system based on high-voltage discharge |
| CN112525494A (en) * | 2020-11-24 | 2021-03-19 | 中国科学院上海光学精密机械研究所 | Device and method for improving and measuring pointing stability of high repetition frequency ultrafast laser filament |
| CN113009178A (en) * | 2021-02-18 | 2021-06-22 | 上海交通大学 | Flow velocity measurement system based on sliding electric arc |
| CN113640542A (en) * | 2021-08-10 | 2021-11-12 | 中国人民解放军国防科技大学 | Sliding arc discharge-based speed measurement device and method for scramjet engine combustion chamber |
| 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 |
| CN114689898B (en) * | 2022-03-30 | 2024-01-12 | 中国人民解放军国防科技大学 | Device and method for observing femtosecond laser wire-forming impact cloud droplet |
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