CN106198491A - The apparatus and method of the breakdown point distance of improving laser induction air breakdown - Google Patents
The apparatus and method of the breakdown point distance of improving laser induction air breakdown Download PDFInfo
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- CN106198491A CN106198491A CN201610524102.2A CN201610524102A CN106198491A CN 106198491 A CN106198491 A CN 106198491A CN 201610524102 A CN201610524102 A CN 201610524102A CN 106198491 A CN106198491 A CN 106198491A
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- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/62—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light
- G01N21/71—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light thermally excited
- G01N21/718—Laser microanalysis, i.e. with formation of sample plasma
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Abstract
A kind of apparatus and method of the breakdown point distance of improving laser induction air breakdown, first with light combination mirror, a branch of femto-second laser pulse and a branch of nanosecond laser pulses are closed bundle, by the time delay between regulation two-beam, make femtosecond laser prior to the nanosecond laser regular hour, with concave mirror mirror, two-beam focusing is produced induced breakdown in atmosphere.First bundle femtosecond laser is focused on unlike common laser-induced breakdown by the method in advance, form preionization in atmosphere, the electronics produced reduces the aerial breakdown threshold of nanosecond laser, the breakdown point distance making nanosecond laser generation induced breakdown is farther compared with traditional method, and the development of long-range atmospheric sounding techniques is laid a good foundation by farther breakdown point distance.The present invention has important meaning for the gas componant in remote probe atmospheric environment and content.
Description
Technical field
The present invention relates to laser spectrum tech field, the breakdown point distance of a kind of improving laser induction air breakdown
Apparatus and method, atmospheric environment remote probe is had important meaning.
Background technology
LIBS in air is the spectrum detection technique of a kind of advanced person, and its concrete principle is: profit
With in high energy pulse laser focusing to air, form high temperature, highdensity plasma, measure Plasma-Atomic and molecule
Line wavelength in emission spectrum and intensity, thus chemical element contained in air is carried out qualitative and quantitative analysis.Due to height
The plurality of advantages such as sensitivity, remote nature, it is mutual with gaseous matter that LIBS has become as Study of Laser
The important tool of effect.
Traditional air-breathing laser induced breakdown spectroscopy is to utilize single bundle nanosecond laser to focus on formation in air to puncture
Spectrum, but be as the increase of condenser lens focal length, i.e. the increase of breakdown point distance, the laser intensity of focal point reduces, until
Plasma cannot be formed in atmosphere, thus limit the development of air medium-long range Detection Techniques.
Summary of the invention
It is desirable to provide the apparatus and method of the breakdown point distance of a kind of improving laser induction air breakdown, there is letter
Single, effective feature.
The technical solution of the present invention is as follows:
The device of the breakdown point distance of a kind of improving laser induction air breakdown, including nanosecond laser and concave reflection
Mirror, it is characterised in that also include femto-second laser, delay controller, light combination mirror, convex lens and spectrogrph, described femtosecond laser
The trigger output signal end of device is connected with the input of described delay controller, and the outfan of this delay controller is with described
The triggering input of nanosecond laser is connected, and the femto-second laser pulse of described femto-second laser output is saturating through described light combination mirror
Forming transmission light after penetrating, the nanosecond laser pulses of described nanosecond laser output forms reflection after described light combination mirror reflection
After light, this transmission light and reflection combiner, inject described concave mirror, and focus on shape in air through this concave mirror
Becoming induced breakdown spectroscopy, the fluorescence spectrum of generation is in convex lens collects spectrogrph.
Utilize the method that the device of the breakdown point distance of above-mentioned improving laser induction air breakdown carries out laser-induced breakdown,
Comprise the steps of
1. by delay controller, the trigger output signal of femto-second laser is accessed nanosecond laser through certain time-delay
Triggering input；
2. regulate light path, make the femto-second laser pulse from femto-second laser output form transmission light through light combination mirror transmission, from
The nanosecond laser pulses of nanosecond laser output reflects to form reflection light through light combination mirror, regulates femto-second laser pulse, nanosecond laser
Pulse and light combination mirror make reflection light overlap with transmission light, and femto-second laser pulse and nanosecond laser pulses after ECDC bundle are anti-through concave surface
Penetrate mirror to focus in air；
3. with convex lens, the LIBS produced in air is focused in spectrogrph.Finely tune described time delay control
The time delay of device processed, when spectrogrph display photoluminescence spectrum intensity value maximum, is the delay positions that can reach farthest breakdown point.
The technique effect of the present invention:
A branch of femtosecond, on the basis of tradition list bundle nanosecond laser focuses on induction air breakdown, is swashed by the present invention with light combination mirror
Light and a branch of nanosecond laser close bundle, and control described femtosecond laser and described nanosecond laser with certain time-delay first with delay controller
Focus on by concave mirror and produce induced with laser air breakdown.By said apparatus and method so that at tradition list Shu Namiao
Laser focusing cannot form the distance of plasma and successfully induce air breakdown, thus extends the distance of breakdown point.In experiment,
Use above-mentioned apparatus and method so that the breakdown point distance of induced with laser air breakdown is three times of traditional method.
Accompanying drawing explanation
Fig. 1 is the device index path of the breakdown point distance of improving laser induction air breakdown；
Wherein: 1 is femto-second laser, 2 is delay controller, and 3 is light combination mirror, and 4 is nanosecond laser, and 5 is concave reflection
Mirror, 6 is convex lens, and 7 is spectrogrph.
Detailed description of the invention
Below in conjunction with embodiment and accompanying drawing, the invention will be further described, but should not limit the protection model of the present invention with this
Enclose.
First refer to Fig. 1, for the index path being embodied as of improving laser induced breakdown spectroscopy operating distance.Such as figure
Shown in, the femto-second laser pulse centre wavelength that femto-second laser 1 sends is 800nm, and pulse width is about 40fs, and repetition rate is
1kHz, the nanosecond laser pulses centre wavelength that nanosecond laser 4 sends is 10.6 μm, and pulse width is about 120ns, repetition rate
For 10Hz.The trigger output signal of femto-second laser 1 is connected with the input of delay controller 2, the outfan of delay controller 2
It is connected with the triggering input of nanosecond laser 4.Open femto-second laser 1 and nanosecond laser 4, will by delay controller 2
The trigger output signal of femto-second laser 1 accesses the triggering input of nanosecond laser 4 through certain time-delay (the most hundreds of nanosecond).
Along femtosecond laser outbound course, light path sets gradually light combination mirror 3 and concave mirror 5, regulate light path, make to swash from femtosecond
The femto-second laser pulse of light device 1 output forms transmission light through light combination mirror transmission；The nanosecond laser arteries and veins of regulation nanosecond laser 4 output
Punching so that it is reflect to form reflection light through light combination mirror, with the scraps of paper that are in the light respectively near light combination mirror 3 with at concave mirror 5
Observing two hot spots, regulation femto-second laser pulse, nanosecond laser pulses and described light combination mirror 3 make two hot spots equal two positions
Overlap, thus realize closing bundle and equidirectional propagation；Adjust concave mirror 5 so that light beam focuses on focus；Will with convex lens 6
The LIBS produced in air focuses in spectrogrph 7, finely tunes the time delay of described delay controller 2, works as spectrum
Instrument 7 shows that when photoluminescence spectrum intensity value is optimized to maximum, (now regulating time delay to different directions, the fluorescence that spectrogrph shows is strong
Angle value all can reduce), reach the delay positions of farthest breakdown point.
Claims (2)
1. a device for the breakdown point distance of improving laser induction air breakdown, including nanosecond laser (4) and concave reflection
Mirror (5), it is characterised in that also include femto-second laser (1), delay controller (2), light combination mirror (3), convex lens (6) and spectrogrph
(7), the trigger output signal end of described femto-second laser (1) is connected with the input of described delay controller (2), and this prolongs
Time controller (2) outfan be connected with the triggering input of described nanosecond laser (4), described femto-second laser (1)
The femto-second laser pulse of output forms transmission light after described light combination mirror (3) transmission, and described nanosecond laser (4) exports
After nanosecond laser pulses forms reflection light, this transmission light and reflection combiner after described light combination mirror (3) reflection, inject described
Concave mirror (5), and focus in air formation induced breakdown spectroscopy, the fluorescence light of generation through this concave mirror (5)
Spectrum is in convex lens (6) collects spectrogrph (7).
It is empty that the device of the breakdown point distance of improving laser the most according to claim 1 induction air breakdown carries out induced with laser
The method that gas punctures, it is characterised in that the method comprises the steps of
1. by delay controller (2), the trigger output signal of femto-second laser (1) is accessed nanosecond laser through certain time-delay
The triggering input of device (4)；
2. regulate light path, make the femto-second laser pulse exported from femto-second laser (1) form transmission light through light combination mirror (3) transmission,
The nanosecond laser pulses exported from nanosecond laser (4) reflects to form reflection light through light combination mirror (3), regulation femto-second laser pulse,
Nanosecond laser pulses and light combination mirror (3) make reflection light overlap with transmission light, the femto-second laser pulse after ECDC bundle and nanosecond laser
Pulse focuses in air through concave mirror (5)；
3. with convex lens (6), the LIBS produced in air is focused in spectrogrph (7), finely tune described time delay
The time delay of controller (2), when spectrogrph (7) display photoluminescence spectrum intensity value maximum, reaches the delay positions of farthest breakdown point.
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| CN201610524102.2A CN106198491B (en) | 2016-07-06 | 2016-07-06 | The device and method that improving laser induces the breakdown point distance of air breakdown |
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| CN106198491A true CN106198491A (en) | 2016-12-07 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107953027A (en) * | 2018-01-15 | 2018-04-24 | 哈尔滨工业大学 | A kind of femtosecond of pulse combined-nanosecond laser system of processing and processing method |
| CN111413515A (en) * | 2020-03-05 | 2020-07-14 | 天津大学 | Laser-induced multipoint breakdown marking speed measuring method |
| CN111432544A (en) * | 2020-04-01 | 2020-07-17 | 中国航空制造技术研究院 | Combined laser plasma back-conduction system and method |
| WO2021143818A1 (en) * | 2020-01-16 | 2021-07-22 | 安徽省东超科技有限公司 | Air ionization display device |
| CN113433708A (en) * | 2021-06-22 | 2021-09-24 | 安徽省东超科技有限公司 | Air ionization display device and control method thereof |
| CN114019326A (en) * | 2021-11-03 | 2022-02-08 | 国网安徽省电力有限公司电力科学研究院 | Laser induced discharge method and system for generating long-distance controllable high-voltage discharge |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107953027A (en) * | 2018-01-15 | 2018-04-24 | 哈尔滨工业大学 | A kind of femtosecond of pulse combined-nanosecond laser system of processing and processing method |
| CN107953027B (en) * | 2018-01-15 | 2019-09-20 | 哈尔滨工业大学 | A kind of femtosecond of pulse combined-nanosecond laser system of processing and processing method |
| WO2021143818A1 (en) * | 2020-01-16 | 2021-07-22 | 安徽省东超科技有限公司 | Air ionization display device |
| CN111413515A (en) * | 2020-03-05 | 2020-07-14 | 天津大学 | Laser-induced multipoint breakdown marking speed measuring method |
| CN111432544A (en) * | 2020-04-01 | 2020-07-17 | 中国航空制造技术研究院 | Combined laser plasma back-conduction system and method |
| CN113433708A (en) * | 2021-06-22 | 2021-09-24 | 安徽省东超科技有限公司 | Air ionization display device and control method thereof |
| WO2022267780A1 (en) * | 2021-06-22 | 2022-12-29 | 安徽省东超科技有限公司 | Air ionization display device and control method therefor |
| CN114019326A (en) * | 2021-11-03 | 2022-02-08 | 国网安徽省电力有限公司电力科学研究院 | Laser induced discharge method and system for generating long-distance controllable high-voltage discharge |
| CN114019326B (en) * | 2021-11-03 | 2023-09-26 | 国网安徽省电力有限公司电力科学研究院 | Laser-induced discharge method and system for generating long-distance controllable high-voltage discharge |
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