CN106706601A - Laser-induced breakdown fluorescence spectrum analysis system based on optical fiber waveguide cyclic excitation - Google Patents

Laser-induced breakdown fluorescence spectrum analysis system based on optical fiber waveguide cyclic excitation Download PDF

Info

Publication number
CN106706601A
CN106706601A CN201611143484.0A CN201611143484A CN106706601A CN 106706601 A CN106706601 A CN 106706601A CN 201611143484 A CN201611143484 A CN 201611143484A CN 106706601 A CN106706601 A CN 106706601A
Authority
CN
China
Prior art keywords
laser
optical fiber
fibre
induced breakdown
fiber
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CN201611143484.0A
Other languages
Chinese (zh)
Other versions
CN106706601B (en
Inventor
郭连波
易荣兴
李嘉铭
杨新艳
周冉
李祥友
陆永枫
曾晓雁
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Huazhong University of Science and Technology
Original Assignee
Huazhong University of Science and Technology
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Huazhong University of Science and Technology filed Critical Huazhong University of Science and Technology
Priority to CN201611143484.0A priority Critical patent/CN106706601B/en
Publication of CN106706601A publication Critical patent/CN106706601A/en
Application granted granted Critical
Publication of CN106706601B publication Critical patent/CN106706601B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E30/00—Energy generation of nuclear origin
    • Y02E30/10—Nuclear fusion reactors

Landscapes

  • Health & Medical Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Plasma & Fusion (AREA)
  • Optics & Photonics (AREA)
  • Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Investigating, Analyzing Materials By Fluorescence Or Luminescence (AREA)

Abstract

The invention discloses a laser-induced breakdown fluorescence spectrum analysis system based on optical fiber waveguide cyclic excitation. The analysis system comprises a laser generation module, a resonance excitation module and an acquisition module, wherein the laser generation module comprises a laser total-reflection mirror, a focusing lens and an Nd:YAG laser; the laser total-reflection mirror and the Nd:YAG laser are positioned on a same horizontal optical path, and the focusing lens is positioned under the laser total-reflection mirror; the resonance excitation module comprises an OPO (optical parametric oscillator) laser, a multi-core optical fiber, an optical fiber output shaping module and two optical fiber couplers, two input ends of the multi-core optical fiber are connected with the two optical fiber couplers, and an output end is connected with the optical fiber output shaping module; and the acquisition module comprises an optical fiber acquisition head, an enhancement type CCD (charge coupled device) and a computer, one end of the optical fiber acquisition head aims at a sample ablation point, the other end of the optical fiber acquisition head is connected with the enhancement type CCD through a grating spectrograph, and the enhancement type CCD is connected with the computer. The system is simple in structure and can improve an enhancement effect of resonance excitation, thereby improving the detection limit of LIBS (Laser-induced Breakdown Spectroscopy).

Description

Based on the laser-induced breakdown spectrofluorimetry system that fibre-optic waveguide circulation is excited
Technical field
The invention belongs to plasma physics and spectrum analysis field, excited more particularly, to based on fibre-optic waveguide circulation Laser-induced breakdown spectrofluorimetry system.
Background technology
Laser microprobe technology, i.e. LIBS (Laser-Induced breakdown Spectroscopy, abbreviation LIBS), it is a kind of fast component analytical technology of great prospect, its principle is close using high power Degree pulse laser ablation sample to be analysed surface, moment produces degree high temperature up to ten thousand, forms plasma, and plasma is cooled Outside radiation feature spectrum in journey, by gather its characteristic spectrum just can analyze obtain sample to be analysed in heterogeneity and its Content.Because there are LIBS n.s to pre-process, multielement simultaneously detect and can on-line checking the features such as, in recent years, the skill Art obtains the very big concern of academic and industrial circle.However, LIBS is about to the detectable limit of most elements at present 10ppm, causes it to be difficult to meet micro, particularly trace element detection requirement.Therefore, the further wide of the technology is hindered General application, particularly in the popularization and application in the field such as environmental protection and food security.
To improve the sensitivity of laser microprobe, the method for current main flow is that Laser Plasma Emission Spectrum is increased By force, space constraint enhancing, magnetic confinement enhancing, microwave enhancing, dipulse enhancing, dipulse resonant excitation Enhancement Method are mainly included Deng.These methods can to a certain extent strengthen the intensity of emission spectra of plasma, and the detection for improving laser microprobe is sensitive Degree, wherein again the most notable with dipulse resonant excitation enhancing method effect.Chinese patent CN101782517A discloses a kind of base In the component analyzer for laser probe micro-area of resonant excitation double laser light source, patent utilization the first beam laser ablation sample is produced Plasma, then resonant excitation is carried out by the particle of element to be measured in the second beam tunable wave length laser plasma, from And component spectrum intensity to be measured is improved tens of to hundreds times.In current existing document, using the double arteries and veins of above-mentioned tunable laser Rush excitation technique, can farthest enhanced spectrum intensity, while typically the detectable limit of detected element can be brought up to 1ppm magnitudes.
However, huge to the market of trace element analysis in world wide at present, the detectable limit of 1ppm can not meet The safety standards such as soil, food.By taking China as an example, the content according to China for heavy metal in most of grains and biological products Standard, its GB content is general in below 1ppm.Therefore, LIBS is used for fast qualitative and the accurate quantitative analysis inspection of trace element Survey field, there is provided one kind can further enhance LIBS technology spectral intensities, so that the system for improving its detectable limit is essential.
The content of the invention
For the disadvantages described above or Improvement requirement of prior art, excited based on fibre-optic waveguide circulation the invention provides one kind Laser-induced breakdown spectrofluorimetry system, it passes through to recycle the tunable wave length based on optical parametric oscillator and swashs The resonance laser of light device (OPO lasers) output, to increase the pulsewidth of resonance laser, realizes the thorough of trace element ground state particle Excite, improve traditional dipulse resonance excitation technique, while improving laser microprobe to the detectivity of trace element and determining Amount analysis precision, it is adaptable to the detection to trace heavy metals in grain and biological sample.
To achieve the above object, the present invention proposes a kind of laser-induced breakdown fluorescence excited based on fibre-optic waveguide circulation Spectroscopic analysis system, it includes that laser occurs module, resonant excitation module and acquisition module, wherein：
The laser occurs module to be included laser total reflective mirror, condenser lens and makes sample to be analyzed for emission pulse laser The Nd of product ablated surface：YAG laser, the laser total reflective mirror and the Nd：The light-emitting window of YAG laser is located at same level light Lu Zhong, the condenser lens is vertical with the horizontal optical path with the line of laser total reflective mirror, and the underface of the condenser lens is set There is the electricity driving displacement platform for placing sample to be analysed；
The resonant excitation module include OPO lasers, double-width grinding Single-end output broadband multi-core fiber and with it is described The light-emitting window of OPO lasers is located at the first fiber coupler being arranged in order, optical fiber output sizing die in same level light path Block and the second fiber coupler, two inputs of the double-width grinding Single-end output broadband multi-core fiber respectively with first optical fiber Coupler and the second fiber coupler are connected, and output end is connected with the optical fiber output Shaping Module；
The acquisition module includes collecting fiber head, grating spectrograph, enhanced CCD and computer, the collecting fiber One end of head is directed at the ablation point in the sample to be analysed, and the other end is by gathering optical fiber, grating spectrograph with the enhancing Type CCD is connected, and the enhanced CCD is connected with the computer.
For traditional at present pulse and the not good problem of resonant excitation laser microprobe sensitivity, the invention provides upper Technical scheme is stated, by recycling the resonance laser that OPO lasers are exported, the pulse that on the one hand can increase resonance laser is wide Degree；On the other hand can plasma carry out lasting resonant excitation, to realize element ground state particle to be measured in plasma Thoroughly excite, improve tunable laser utilization ratio, so as to greatly improve the double laser light source based on resonant excitation swash The detectable limit of light probe.
As it is further preferred that the Nd：YAG laser (2) positioned at the top of OPO lasers, pacify by the OPO lasers On optical table.
As it is further preferred that the laser total reflective mirror is fixed with condenser lens by fixed support.
Used as it is further preferred that the analysis system also includes digital delay pulse generator, it is used to controlling described OPO lasers and Nd：Time delay between the shoot laser of YAG laser, while for controlling the enhanced CCD collections spectrum Time delay.
Used as it is further preferred that the output waveband of the OPO lasers is in 200-400nm, pulse width is 5-10ns Magnitude, commonly uses ultraviolet band laser energy in 0.5-10mJ, and laser repetition rate is 1-20Hz.
As it is further preferred that the grating spectrograph and enhanced CCD are gathered since the OPO lasers light extraction Spectrum, until plasma cools down stopping collection completely, acquisition time is 20-1000ns magnitudes.
As it is further preferred that the double-width grinding Single-end output broadband multi-core fiber be used for laser circulation excite, its Service band is ultraviolet to visible light wave range for 200nm-400nm's, fibre core number 8 cores and more than.
As it is further preferred that the broadband multi-core fiber is staggered structure, its two input B1, B2By multicore Optical fiber is constituted, and for collecting resonance laser, its output terminals A is by input B1, B2Collect and form, and the fibre core of output terminals A is pressed B1B2B1B2It is this to be mingled with pattern every one and be staggered.
As it is further preferred that it is described collection optical fiber input be M × N rectangular arrangeds, output end be longitudinal direction 1 × (M × N) word order.
In general, possess following compared with prior art, mainly by the contemplated above technical scheme of the present invention Technological merit：
1. the present invention conducts resonance laser using the optical fiber of double-width grinding Single-end output structure by first input end, and In output end output, then in the resonance laser unnecessary with second input " recovery " of output end same straight line, will pass through The resonance laser of plasma is collected again, and by output end, imports resonant excitation light path again, the structure can make it is a branch of can Tuning laser is lasting in time domain to carry out resonant excitation to specific atoms, to recycle resonance laser, so as to be lifted adjustable The utilization rate of humorous laser, is obviously improved the detectable limit of system, compared to traditional laser-induced breakdown fluorescence spectroscopy technique Speech, the fluorescence time of the invention, to μ s magnitudes, greatly improves from 10ns magnitudes (OPO laser device lasers pulsewidth) maximum extension The utilization rate of OPO laser, so as to improve single Nd：The fluorescence intensity that resonant excitation is produced after YAG laser ablations.
2. light path system of the invention devises the broadband multi-core fiber of staggered structure to ensure output end laser Uniformity, first band optical fiber by the resonance laser of different wave length, can increase the versatility of the system；Secondly because resonance Laser can cause, this optic fibre input end B uneven by the light distribution after plasma by plasma absorption1And B2By many Core fibre is constituted, and for collecting resonance laser, output terminals A is by input B1And B2Collect and form, and fibre core presses B1B2B1B2It is this It is mingled with pattern every one to be staggered, this staggered structure can believe first input end and the laser of the second input input Number it is evenly distributed in output end face, it is ensured that by the uniformity of the tunable laser of heating region, and make plasma By resonance laser all standing.
3. the present invention is spatially had uneven using the collection optical fiber with spatial resolving power due to plasma The characteristic of distribution, the collection optical fiber that the system is designed is M × N rectangular arrangeds (space as needed for of M, N value here for input Resolution ratio determines that M, N value more large space resolution ratio are higher, and the smaller spatial resolution of M, N value is lower), output end is longitudinal direction 1 × (M × N) word orders so that plasma is longitudinally split in output end, so that can be reciprocity under conditions of single acquisition Gas ions carry out spatial discrimination research, obtain plasma fluorescent space distribution situation, the energy state of particle point in plasma Guidance is made in the research of cloth.
Brief description of the drawings
Fig. 1 is the laser-induced breakdown spectrofluorimetry excited based on fibre-optic waveguide circulation provided in an embodiment of the present invention The structural representation of system；
Fig. 2 is the structural representation of double-width grinding Single-end output broadband multi-core fiber；
Fig. 3 is collection fiber end face schematic diagram；
Fig. 4 swashs for conventional laser induced breakdown spectroscopy, tunable laser dipulse spectral technique and single cycle Photoinduction punctures the spectrum comparison diagram of fluorescence spectroscopy technique.
Specific embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, it is right below in conjunction with drawings and Examples The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and It is not used in the restriction present invention.As long as additionally, technical characteristic involved in invention described below each implementation method Not constituting conflict each other can just be mutually combined.
As shown in figure 1, the laser-induced breakdown fluorescence light excited based on fibre-optic waveguide circulation provided in an embodiment of the present invention Spectral analysis system, it includes that laser occurs module, resonant excitation module and acquisition module, and wherein laser occurs module is used to produce Plasma simultaneously makes sample to be analysed ablation, and resonant excitation module carries out resonant excitation for plasma, improves characteristic light Spectral intensity, acquisition module is used to gather the characteristic spectrum signal that transition is produced after resonant excitation.By the phase of above-mentioned modules Mutually coordinate, be capable of achieving the thorough utilization ratio for exciting, improving tunable laser of element ground state particle to be measured in plasma, So as to greatly improve the detectable limit of the laser microprobe of the double laser light source based on resonant excitation.The system simple structure, can be with The utilization ratio of the raising tunable wave length laser of geometry multiple, so as to improve the enhancing effect of resonant excitation, final raising is swashed The detectable limit of photoinduction breakdown spectral technology (LIBS) so that LIBS technologies can be detected in grain security, biological heavy metal-polluted The trace analysis fields such as dye are applied.
Below more specific detail will be one by one carried out to modules.
As shown in figure 1, laser occurs module includes laser total reflective mirror 4, condenser lens 8 and Nd：YAG laser 2, Nd：YAG The Main Function of laser 2 is emission pulse laser produces plasma on the surface of sample to be analysed 7, and the plasma makes to treat point Analyse the ablated surface of sample 7, the laser total reflective mirror 4 and Nd：The light-emitting window of YAG laser 2 is located in same level light path, is used for By Nd：YAG laser reflects to vertically downward direction, and condenser lens 8 is located at the underface of laser total reflective mirror 4, for focusing on Nd： YAG laser, it is vertical with horizontal optical path with the line of laser total reflective mirror 4, and the underface of the condenser lens 8 is provided with electricity driving displacement Platform 6, the electricity driving displacement platform 6 is used to place sample to be analysed 7.Specifically, laser total reflective mirror 4 and condenser lens 8 are all by solid Fixed rack 23 is fixed.During analysis test, Nd：The laser of the transmitting of YAG laser 2 reflects through laser total reflective mirror 4 successively, condenser lens 8 focus on, and eventually arrive at the surface of sample to be analysed 7, produce plasma.
As shown in figure 1, resonant excitation module include OPO lasers 1, double-width grinding Single-end output broadband multi-core fiber 10, First fiber coupler 3, the fiber coupler 9 of optical fiber output Shaping Module 5 and second, wherein, OPO lasers 1 are based on optics The Wavelength tunable laser of parametric oscillator (Optical Parametric Oscillator, abbreviation OPO), its effect master If to Nd：The plasma that YAG laser 2 is inspired carries out resonant excitation, improves characteristic spectrum intensity, specifically, OPO swashs Light device 1 is located at Nd：The lower section of YAG laser 2, it is arranged on optical table 22.And double-width grinding Single-end output broadband multicore Optical fiber 10 is used for laser circulation and excites, and it carries out pulsewidth and widens in time domain to the resonance laser that OPO lasers 1 send so that Single ablation plasma can further improve characteristic spectrum in the range of the longer time by the humidification of resonant excitation light Intensity.First fiber coupler 3, the fiber coupler 9 of optical fiber output Shaping Module 5 and second are arranged in order, and swash with OPO The light-emitting window of light device 1 be located at same level light path on, during work whole horizontal optical path by sample to be analysed 7 surface, it is double Two inputs of end input Single-end output broadband multi-core fiber 10 respectively with the first fiber coupler 3 and the second fiber coupler 9 It is connected, output terminals A is connected with optical fiber output Shaping Module 5.
Specifically, as shown in Fig. 2 being friendship for the double-width grinding Single-end output broadband multi-core fiber 10 that laser circulation is excited Wrong arrangement architecture, two input B1And B2Constituted by multi-core fiber, for collecting OPO laser (resonate laser), fibre core Number 8 cores and more than, its output terminals A is by input B1, B2Collect and form, and the fibre core of output terminals A presses B1Fibre core, B2Fibre core, B1 Fibre core, B2Fibre core is this to be mingled with pattern and is staggered every one, and the service band of broadband multi-core fiber 10 is the purple of 200nm-400nm Outward to visible light wave range, compared to single-core fiber, a plurality of core diameter of double-width grinding Single-end output broadband multi-core fiber 10 can be most The laser that the uniform output terminals A of limits is exported, improves overall stability.
Further, fiber coupler and the horizontal positioned of OPO lasers 1, the laser wherein the first fiber coupler 3 will resonate The first input end coupling that (by controlling the OPO crystal angle tunable lasers wavelength in OPO lasers) passes through multi-core fiber 10 Close into multi-core fiber 10, resonance laser by after the multi-core fiber 10 for laser temporal broadening again by the port of its output end Output, after then passing through heating region, the multi-core fiber 10 for laser temporal broadening is entered through the second fiber coupler 9 The second input port, and exported by output end port again, by heating region, so repeatedly, until laser Energy attenuation is to minimum.
Further, in 200-400nm, pulse width is 5-10ns magnitudes, laser energy to the output waveband of OPO lasers 1 In 0.5-10mJ, laser repetition rate is 1-20Hz；Optical fiber output Shaping Module 5 focuses on microscope group by a face beam expanding lens and one side Into its Main Function is control resonance laser beam divergence, it is ensured that resonance laser just covers heating region.
As shown in figure 1, acquisition module include collecting fiber first 11, grating spectrograph 12, enhanced CCD13 (as ICCD, It adds image intensifier in CCD camera front end, so as to obtain the ability of SECO and signal enhancing) and computer 14, One end of collecting fiber first 11 is directed at Nd：Ablation point of the laser that YAG laser 2 sends on sample 7, the other end is passed sequentially through Collection optical fiber 21, grating spectrograph 12 are connected with enhanced CCD13, and the enhanced CCD13 is connected with computer 14, and it passes through the One coaxial cable 16 is realized communicating with computer 14.Wherein, the effect of grating spectrograph 12 is the plasma spectrum that will be collected Signal resolves into the characteristic spectrum of different elements by optical grating diffraction；The effect of enhanced CCD13 is the door of control collection spectrum Width, and photon to collecting carries out quantity multiplication.Computer 14 has been internally integrated spectral analysis software, laser control software With displacement platform control software, with spectrum analysis, the function such as data processing, it is coaxial by the 5th with electricity driving displacement platform 6 Cable 20 is connected.Specifically, grating spectrograph 12 and enhanced CCD13, gather spectrum since the light extraction of OPO lasers 1, until Plasma cools down stopping collection completely, and acquisition time is 20-1000ns magnitudes.
Specifically, the service band of the collection optical fiber 21 for gathering plasma emission spectroscopy is 190nm-800nm, its Input fibre core is M × N rectangular arrangeds, and output end is 1 × (M × N) word order of longitudinal direction, for example, input fibre core is 2 × 3 Arrangement, output end is 1 × 6 arrangement, and compared to single-core fiber, this optical fiber can realize plasma space resolving acquisition.
Additionally, analysis system also include digital delay pulse generator 15, its respectively with Nd：YAG laser, OPO laser Device and enhanced CCD communication connections, for controlling OPO lasers 1 and Nd：Time delay between the shoot laser of YAG laser 2, Enhanced CCD13 is controlled to gather the time delay of spectrum simultaneously.Specifically, enhanced CCD13, Nd：YAG laser 2 and OPO lasers 1 respectively by the second coaxial cable 17, the coaxial cable 19 of triaxial cable 18 and the 4th and digital delay pulse generator 15 It is connected.
Below to the above-mentioned laser-induced breakdown spectrofluorimetry system excited based on fibre-optic waveguide circulation of the invention Specific operation process be described in detail, its concrete operations is as follows：
(1) it is analysed to sample 7 first and polishes be positioned on electricity driving displacement platform 6, the height of regulation electricity driving displacement platform 6, So that the light extraction that sample surfaces highly reach OPO lasers 1 is highly located；
(2) Nd is opened:YAG laser 2, OPO lasers 1, while according to element species in sample to be analysed, adjusting OPO The output wavelength of laser 1；
(3) electricity driving displacement platform 6 is opened, motor pattern is set, it is ensured that be independent of each other between each ablation point；
(4) time delay of digital delay impulse generator 15 is set, when between two lasers of control and enhanced CCD13 Order relation, digital delay impulse generator 15 sends three trigger signals, and Nd is opened in triggering respectively in chronological order:YAG laser 2 light extractions, the light extraction of OPO lasers 1 and enhanced CCD13 collection spectrum；Nd:The reflected mirror of ablative laser that YAG laser 2 sends 4, plus lens 8 focuses on sample surfaces and produces plasma；The resonance laser that OPO lasers 1 send is by the first fiber coupling Device 3 is coupled into the B1 ports of double-width grinding Single-end output broadband multi-core fiber 10, and defeated by the shaping of optical fiber output Shaping Module 5 Go out, be radiated on generation plasma, element-specific atomic resonance is excited, the laser of transmission is by the coupling of the second fiber coupler 9 The B2 ports of the broadband multi-core fiber 10 for entering double-width grinding Single-end output are closed, and again by the shaping of optical fiber output Shaping Module 5 Output, is radiated on generation plasma, and element-specific atomic resonance is excited, and such iterative cycles are repeatedly to same plasma Body carries out resonant excitation；
(5) the characteristic spectrum signal that transition is produced after resonant excitation is collected through collecting fiber first 11 and enters optical fiber 21, afterwards It is conducted into grating spectrograph 12 by grating beam splitting；
(6) optical signal after wavelength dispersion is acquired on enhanced CCD13 by the time delay and gate-width of setting, complete afterwards Into photoelectric conversion, the electric signal output comprising spectral information is formed, gained signal passes to computer 14 by control cable 16；
(7) computer 14 is analyzed by spectral analysis software to the spectrum for collecting, and the result that will be obtained is scheming Piece is exported.
Fig. 4 is that collection spectrum is right with common LIBS and LIBS-LIF system acquisitions spectrum after the system single time domain is superimposed Than figure, spectral intensity is obviously improved when being as can be seen from the figure analyzed test using system of the invention.
In general, the present invention passes through to improve the light path of resonance laser and action of plasma, using the thing of resonant excitation Reason principle, line broadening is entered in time domain to resonance laser, recycles resonance laser so that same plasma can be longer Excited by resonance laser resonant in time range, be obviously improved the detectable limit of system, improve the enhancing effect of resonant excitation； And using broadband multi-core fiber so that the versatility of system becomes strong, and ensure that the stability of tunable laser output, enhances The performance of equipment, the guarantee of stability and the raising of spectral intensity enable laser microprobe technology in grain and biological products with much money Category detection field is applied, and has promoted the range of application of laser microprobe technology.
As it will be easily appreciated by one skilled in the art that the foregoing is only presently preferred embodiments of the present invention, it is not used to The limitation present invention, all any modification, equivalent and improvement made within the spirit and principles in the present invention etc., all should include Within protection scope of the present invention.

Claims (9)

1. the laser-induced breakdown spectrofluorimetry system for being excited based on fibre-optic waveguide circulation, it is characterised in that including laser Generation module, resonant excitation module and acquisition module, wherein：
The laser occurs module to be included laser total reflective mirror (4), condenser lens (8) and makes for emission pulse laser to be analyzed The Nd of sample (7) ablated surface：YAG laser (2), the laser total reflective mirror (4) and the Nd：The light-emitting window of YAG laser (2) In same level light path, the condenser lens (8) is vertical with the horizontal optical path with the line of laser total reflective mirror (4), should The electricity driving displacement platform (6) for placing sample to be analysed (7) is provided with immediately below condenser lens (8)；
The resonant excitation module include OPO lasers (1), double-width grinding Single-end output broadband multi-core fiber (10) and with institute State OPO lasers (1) light-emitting window be located at same level light path on the first fiber coupler (3) being arranged in order, optical fiber it is defeated Go out Shaping Module (5) and the second fiber coupler (9), two inputs in double-width grinding Single-end output broadband multi-core fiber (10) It is connected with first fiber coupler (3) and the second fiber coupler (9) respectively, output end and the optical fiber output sizing die Block (5) is connected；
The acquisition module includes collecting fiber head (11), grating spectrograph (12), enhanced CCD (13) and computer (14), One end of the collecting fiber head (11) is directed at the ablation point on the sample to be analysed (7), and the other end is by gathering optical fiber (21), grating spectrograph (12) is connected with the enhanced CCD (13), the enhanced CCD (13) and the computer (14) phase Even.
2. it is as claimed in claim 1 that the laser-induced breakdown spectrofluorimetry system for exciting is circulated based on fibre-optic waveguide, its It is characterised by, the Nd：YAG laser (2) is positioned at the top of OPO lasers (1), and the OPO lasers (1) are flat installed in optics On platform (22).
It is 3. as claimed in claim 1 or 2 that the laser-induced breakdown spectrofluorimetry system for exciting is circulated based on fibre-optic waveguide, Characterized in that, the laser total reflective mirror (4) is fixed by fixed support (23) with condenser lens (8).
4. it is as claimed in claim 3 that the laser-induced breakdown spectrofluorimetry system for exciting is circulated based on fibre-optic waveguide, its It is characterised by, the analysis system also includes digital delay pulse generator (15), and it is used to control the OPO lasers (1) And Nd：Time delay between the shoot laser of YAG laser (2), while for controlling enhanced CCD (13) the collection spectrum Time delay.
5. it is as claimed in claim 4 that the laser-induced breakdown spectrofluorimetry system for exciting is circulated based on fibre-optic waveguide, its It is characterised by, in 200-400nm, pulse width is 5-10ns magnitudes, laser energy to the output waveband of the OPO lasers (1) In 0.5-10mJ, laser repetition rate is 1-20Hz.
6. it is as claimed in claim 5 that the laser-induced breakdown spectrofluorimetry system for exciting is circulated based on fibre-optic waveguide, its It is characterised by, the grating spectrograph (12) and enhanced CCD (13) gather spectrum since OPO lasers (1) light extraction, Until plasma cools down stopping collection completely, acquisition time is 20-1000ns magnitudes.
7. it is as claimed in claim 6 that the laser-induced breakdown spectrofluorimetry system for exciting is circulated based on fibre-optic waveguide, its It is characterised by, the double-width grinding Single-end output broadband multi-core fiber (10) excites for laser circulation, and its service band is 200nm-400nm's is ultraviolet to visible light wave range, fibre core number 8 cores and more than.
8. it is as claimed in claim 7 that the laser-induced breakdown spectrofluorimetry system for exciting is circulated based on fibre-optic waveguide, its It is characterised by, the broadband multi-core fiber (10) is staggered structure, two input B1And B2By multi-core fiber group Into for collecting OPO laser, its output terminals A is by input B1And B2Collect and form, and the fibre core of output terminals A presses B1Fibre core, B2 Fibre core, B1Fibre core, B2Fibre core is this to be mingled with pattern and is staggered every one.
9. the laser-induced breakdown spectrofluorimetry excited based on fibre-optic waveguide circulation as described in claim any one of 1-8 System, it is characterised in that the input of the collection optical fiber (21) is M × N rectangular arrangeds, output end is 1 × (M × N) of longitudinal direction Word order.
CN201611143484.0A 2016-12-13 2016-12-13 Laser-induced breakdown fluorescence spectrum analysis system based on optical fiber waveguide cyclic excitation Active CN106706601B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201611143484.0A CN106706601B (en) 2016-12-13 2016-12-13 Laser-induced breakdown fluorescence spectrum analysis system based on optical fiber waveguide cyclic excitation

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201611143484.0A CN106706601B (en) 2016-12-13 2016-12-13 Laser-induced breakdown fluorescence spectrum analysis system based on optical fiber waveguide cyclic excitation

Publications (2)

Publication Number Publication Date
CN106706601A true CN106706601A (en) 2017-05-24
CN106706601B CN106706601B (en) 2023-04-11

Family

ID=58937312

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201611143484.0A Active CN106706601B (en) 2016-12-13 2016-12-13 Laser-induced breakdown fluorescence spectrum analysis system based on optical fiber waveguide cyclic excitation

Country Status (1)

Country Link
CN (1) CN106706601B (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107764794A (en) * 2017-11-21 2018-03-06 江西农业大学 Utilize the device of tunable resonance LIBS detection pork heavy metal distribution
CN109444111A (en) * 2018-12-10 2019-03-08 西安交通大学 A kind of optical fiber LIBS detection system and method for optional double pulse modes
CN114235517A (en) * 2021-11-16 2022-03-25 北京科技大学 Method for automatically removing oxide layer of LIBS stokehole sample by nine-point surrounding

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101067603A (en) * 2007-06-05 2007-11-07 华南理工大学 Double-path resonance enhanced laser guidence breakdown spectral trace element analyser and method
CN103512868A (en) * 2013-09-10 2014-01-15 华中科技大学 Micro-domain laser probe component analyzer based on optical fiber waveguide

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101067603A (en) * 2007-06-05 2007-11-07 华南理工大学 Double-path resonance enhanced laser guidence breakdown spectral trace element analyser and method
CN103512868A (en) * 2013-09-10 2014-01-15 华中科技大学 Micro-domain laser probe component analyzer based on optical fiber waveguide

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107764794A (en) * 2017-11-21 2018-03-06 江西农业大学 Utilize the device of tunable resonance LIBS detection pork heavy metal distribution
CN109444111A (en) * 2018-12-10 2019-03-08 西安交通大学 A kind of optical fiber LIBS detection system and method for optional double pulse modes
CN114235517A (en) * 2021-11-16 2022-03-25 北京科技大学 Method for automatically removing oxide layer of LIBS stokehole sample by nine-point surrounding

Also Published As

Publication number Publication date
CN106706601B (en) 2023-04-11

Similar Documents

Publication Publication Date Title
CN105548099B (en) The lossless three-dimensional imaging of historical relic based on two-photon fluorescence excitation and Components identification method
CN105973871B (en) A kind of the microcell scanning means and its microcell scan method of spectral detection Elemental redistribution
Anabitarte et al. Laser‐induced breakdown spectroscopy: fundamentals, applications, and challenges
CN101655459B (en) Element spectral line reverse-extracting method of laser induced breakdown spectrum
CN101995395B (en) Method for online detecting material by laser induction multiple spectrum united fingerprint network
CN101620183B (en) Photoelectric double-pulse laser induced breakdown spectrograph and spectral analysis method
CN105891144B (en) Terahertz scanning system and scan method
CN103512868B (en) A kind of microcell laser probe analytical instrument based on fibre-optic waveguide
CN106769971B (en) A kind of infrared spectroscopy system based on femtosecond pump probe
CN103983631A (en) Detection and extraction system of Raman signal based on synchronous multi-wavelength excitation
CN101196471A (en) Soil heavy metal pollution quantification detecting system and detecting method
CN106706601A (en) Laser-induced breakdown fluorescence spectrum analysis system based on optical fiber waveguide cyclic excitation
CN103822908A (en) Fluorescence, Raman and laser induced atomic emission spectroscopy combined system
CN100559163C (en) Double-path resonance enhanced laser guidence breakdown spectral trace element analyser and method
CN108362682A (en) A kind of multimode fibre LIBS detection device based on compound constant enhanced spectrum
CN105241864A (en) Laser-induce self-assembly method for preparing high-sensitivity optical fiber SERS probe
CN105866099A (en) Raman spectrum acquisition system with low-fluorescence background
CN105738315A (en) Terahertz device for real-time monitoring of biomolecule composition and content and measuring method thereof
CN107064111A (en) Gao Zhongying laser lift-off spark induced breakdown spectroscopy elemental analysis system and method
CN108872161A (en) A kind of laser microprobe molecular resonance excitation-detection method of isotope
CN104964952A (en) In-situ detection method and in-situ detection device for distribution of doping elements of optical fiber preforming bar
Kolesik et al. Effective three-wave-mixing picture and first Born approximation for femtosecond supercontinua from microstructured fibers
CN106706600B (en) A kind of long-range LIBS test macro having Multi probe optical signal collector unit
CN104374751A (en) Device for rapidly detecting nutrient elements of crops based on collinear laser-induced breakdown spectroscopy
CN109884035A (en) A kind of detection device of sample to be tested, detection method and false-proof detection method

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
CB03 Change of inventor or designer information

Inventor after: Guo Lianbo

Inventor after: Yi Rongxing

Inventor after: Li Jiaming

Inventor after: Yang Xinyan

Inventor after: Zhou Ran

Inventor after: Li Xiangyou

Inventor after: Zeng Xiaoyan

Inventor before: Guo Lianbo

Inventor before: Yi Rongxing

Inventor before: Li Jiaming

Inventor before: Yang Xinyan

Inventor before: Zhou Ran

Inventor before: Li Xiangyou

Inventor before: Lu Yongfeng

Inventor before: Zeng Xiaoyan

CB03 Change of inventor or designer information
GR01 Patent grant
GR01 Patent grant