CN106198491B - The device and method that improving laser induces the breakdown point distance of air breakdown - Google Patents
The device and method that improving laser induces the breakdown point distance of air breakdown Download PDFInfo
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- CN106198491B CN106198491B CN201610524102.2A CN201610524102A CN106198491B CN 106198491 B CN106198491 B CN 106198491B CN 201610524102 A CN201610524102 A CN 201610524102A CN 106198491 B CN106198491 B CN 106198491B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- 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 device and method of the breakdown point distance of improving laser induction air breakdown, a branch of femto-second laser pulse and a branch of nanosecond laser pulses are first closed into beam with light combination mirror, by adjusting the delay between two-beam, so that two-beam focusing is generated induced breakdown prior to the nanosecond laser regular hour, with concave mirror mirror by femtosecond laser in air.This method is with common laser-induced breakdown the difference is that in advance focusing the first beam femtosecond laser, preionization is formed in air, the electronics of generation reduces the aerial breakdown threshold of nanosecond laser, so that the breakdown point distance that nanosecond laser generates induced breakdown is farther compared with conventional method, farther breakdown point distance lays a good foundation to the development of long-range atmospheric sounding techniques.The present invention in remote probe atmospheric environment gas componant and content have important meaning.
Description
Technical field
The present invention relates to laser spectrum tech field, especially a kind of breakdown point distance of improving laser induction air breakdown
Device and method, have important meaning to atmospheric environment remote probe.
Background technique
Laser induced breakdown spectroscopy in air is a kind of advanced spectrum detection technique, concrete principle are as follows: benefit
It is focused in air with high energy pulse laser, forms high temperature, highdensity plasma, measure Plasma-Atomic and molecule
Line wavelength and intensity in emission spectrum, to carry out qualitative and quantitative analysis to chemical element contained in air.Due to height
Many advantages, such as sensitivity, remote nature, it is mutual with gaseous matter that laser induced breakdown spectroscopy has become Study of Laser
The important tool of effect.
Traditional air-breathing laser induced breakdown spectroscopy is to focus on to form breakdown in air using single beam nanosecond laser
Spectrum, but with the increase of condenser lens focal length, the i.e. increase of breakdown point distance, the laser intensity of focal point reduces, until
Plasma can not be formed in air, to limit the development of air medium-long range Detection Techniques.
Summary of the invention
The present invention is intended to provide a kind of device and method of the breakdown point distance of improving laser induction air breakdown, have letter
Single, effective feature.
Technical solution of the invention is as follows:
A kind of device of the breakdown point distance of improving laser induction air breakdown, including nanosecond laser and concave reflection
Mirror, it is characterised in that further include femto-second laser, delay controller, light combination mirror, convex lens and spectrometer, the femtosecond laser
The trigger output signal end of device is connected with the input terminal of the delay controller, the output end of the delay controller and described
The triggering input terminal of nanosecond laser is connected, and the femto-second laser pulse of the femto-second laser output is saturating through the light combination mirror
Transmitted light is formed after penetrating, the nanosecond laser pulses of the nanosecond laser output form reflection after the light combination mirror reflection
After light, the transmitted light and reflection combiner, the concave mirror is injected, and focus on shape in air through the concave mirror
At induced breakdown spectroscopy, the fluorescence spectrum of generation is collected into spectrometer by convex lens.
The method for carrying out laser-induced breakdown using the device of the breakdown point distance of above-mentioned improving laser induction air breakdown,
It comprises the steps of
1. the trigger output signal of femto-second laser is accessed nanosecond laser by certain time-delay by delay controller
Triggering input terminal；
2. adjusting optical path, the femto-second laser pulse exported from femto-second laser is made to transmit to form transmitted light through light combination mirror, from
The nanosecond laser pulses of nanosecond laser output reflect to form reflected light through light combination mirror, adjust femto-second laser pulse, nanosecond laser
Pulse and light combination mirror are overlapped reflected light with transmitted light, and the femto-second laser pulse and nanosecond laser pulses after economic cooperation beam are anti-through concave surface
Mirror is penetrated to focus in air；
3. the laser induced breakdown spectroscopy generated in air is focused in spectrometer with convex lens.Finely tune the delay control
The delay of device processed is the delay positions that can achieve farthest breakdown point when spectrometer shows photoluminescence spectrum intensity value maximum.
Technical effect of the invention:
The present invention is swashed a branch of femtosecond with light combination mirror on the basis of traditional single beam nanosecond laser focuses induction air breakdown
Light and a branch of nanosecond laser close beam, and control the femtosecond laser and the nanosecond laser with delay controller with certain time-delay elder generation
It is focused by concave mirror and generates induced with laser air breakdown.By above-mentioned apparatus and method, so that in traditional list Shu Namiao
The distance that laser focusing can not form plasma successfully induces air breakdown, to extend the distance of breakdown point.In experiment,
With above-mentioned apparatus and method, so that the breakdown point distance of induced with laser air breakdown is three times of conventional method.
Detailed description of the invention
Fig. 1 is the device index path for the breakdown point distance that improving laser induces air breakdown；
Wherein: 1 is femto-second laser, and 2 be delay controller, and 3 be light combination mirror, and 4 be nanosecond laser, and 5 be concave reflection
Mirror, 6 be convex lens, and 7 be spectrometer.
Specific embodiment
Below with reference to embodiment and attached drawing, the invention will be further described, but protection model of the invention should not be limited with this
It encloses.
First referring to Fig. 1, the index path of the specific implementation for improving laser induced breakdown spectroscopy operating distance.Such as figure
Shown, the femto-second laser pulse central wavelength that femto-second laser 1 issues is 800nm, and pulse width is about 40fs, and repetition rate is
1kHz, the nanosecond laser pulses central wavelength that nanosecond laser 4 issues 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 terminal of delay controller 2, the output end of delay controller 2
It is connected with the triggering input terminal of nanosecond laser 4.Femto-second laser 1 and nanosecond laser 4 are opened, it will by delay controller 2
Triggering input terminal of the trigger output signal of femto-second laser 1 by certain time-delay (about several hundred nanoseconds) access nanosecond laser 4.
Along femtosecond laser outbound course, light combination mirror 3 and concave mirror 5 are set gradually in optical path, adjusts optical path, make to swash from femtosecond
The femto-second laser pulse that light device 1 exports transmits to form transmitted light through light combination mirror；Adjust the nanosecond laser arteries and veins that nanosecond laser 4 exports
Punching, makes it reflect to form reflected light through light combination mirror, with the light-blocking scraps of paper respectively close to light combination mirror 3 and at concave mirror 5
Two hot spots are observed, adjusting femto-second laser pulse, nanosecond laser pulses and the light combination mirror 3 keeps two hot spots equal two positions
It is overlapped, closes beam and equidirectional propagation to realize；Concave mirror 5 is adjusted, so that light beam focuses on focus；It will with convex lens 6
The laser induced breakdown spectroscopy generated in air focuses in spectrometer 7, finely tunes the delay of the delay controller 2, works as spectrum
It (adjusts be delayed to different directions at this time, the fluorescence that spectrometer is shown is strong when instrument 7 shows that photoluminescence spectrum intensity value is optimized to maximum value
Angle value can all reduce), reach the delay positions of farthest breakdown point.
Claims (2)
1. a kind of device of the breakdown point distance of improving laser induction air breakdown, including nanosecond laser (4) and concave reflection
Mirror (5), it is characterised in that it further include femto-second laser (1), delay controller (2), light combination mirror (3), convex lens (6) and spectrometer
(7), the trigger output signal end of the femto-second laser (1) is connected with the input terminal of the delay controller (2), this prolongs
When controller (2) output end be connected with the triggering input terminal of the nanosecond laser (4), the femto-second laser (1)
The femto-second laser pulse of output forms transmitted light after light combination mirror (3) transmission, the nanosecond laser (4) output
Nanosecond laser pulses form reflected light after light combination mirror (3) reflection, after the transmitted light and reflection combiner, described in injection
Concave mirror (5), and focused on through the concave mirror (5) and form induced breakdown spectroscopy in air, the fluorescence light of generation
Spectrum is collected into spectrometer (7) by convex lens (6).
2. it is empty that the device of the breakdown point distance of improving laser induction air breakdown according to claim 1 carries out induced with laser
The method of gas breakdown, it is characterised in that this method comprises the steps of
1. the trigger output signal of femto-second laser (1) is accessed nanosecond laser by certain time-delay by delay controller (2)
The triggering input terminal of device (4)；
2. adjusting optical path, the femto-second laser pulse exported from femto-second laser (1) is made to form transmitted light through light combination mirror (3) transmission,
The nanosecond laser pulses exported from nanosecond laser (4) reflect to form reflected light through light combination mirror (3), adjust femto-second laser pulse,
Nanosecond laser pulses and light combination mirror (3) are overlapped reflected light with transmitted light, femto-second laser pulse and nanosecond laser after economic cooperation beam
Pulse focuses in air through concave mirror (5)；
3. being focused on the laser induced breakdown spectroscopy generated in air in spectrometer (7) with convex lens (6), the delay is finely tuned
The delay of controller (2) reaches the delay positions of farthest breakdown point when spectrometer (7) show photoluminescence spectrum intensity value maximum.
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| CN106198491B true CN106198491B (en) | 2019-02-26 |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN113433708B (en) * | 2021-06-22 | 2022-10-25 | 安徽省东超科技有限公司 | Air ionization display device and control method thereof |
| 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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| US5847825A (en) * | 1996-09-25 | 1998-12-08 | Board Of Regents University Of Nebraska Lincoln | Apparatus and method for detection and concentration measurement of trace metals using laser induced breakdown spectroscopy |
| CN101620183A (en) * | 2009-07-28 | 2010-01-06 | 华南理工大学 | Photoelectric double-pulse laser induced breakdown spectrograph and spectral analysis method |
| CN105242280A (en) * | 2014-07-08 | 2016-01-13 | 中国科学院理化技术研究所 | Correlated imaging device and correlated imaging method based on optical parametric process |
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2016
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Patent Citations (3)
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|---|---|---|---|---|
| US5847825A (en) * | 1996-09-25 | 1998-12-08 | Board Of Regents University Of Nebraska Lincoln | Apparatus and method for detection and concentration measurement of trace metals using laser induced breakdown spectroscopy |
| CN101620183A (en) * | 2009-07-28 | 2010-01-06 | 华南理工大学 | Photoelectric double-pulse laser induced breakdown spectrograph and spectral analysis method |
| CN105242280A (en) * | 2014-07-08 | 2016-01-13 | 中国科学院理化技术研究所 | Correlated imaging device and correlated imaging method based on optical parametric process |
Non-Patent Citations (1)
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| 共线双脉冲激光诱导等离子体膨胀动力学研究;王绩勋;《中国优秀硕士学位论文全文数据库 信息科技辑》;20160315(第03期);第20-25页、图3.8-图3.13 * |
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