CN103712962A - Laser probe analyzer based on aerosolization and resonance excitation - Google Patents
Laser probe analyzer based on aerosolization and resonance excitation Download PDFInfo
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Abstract
The invention discloses a laser probe component analyzer. The laser probe component analyzer comprises a Nd. YAG (neodymium-doped yttrium aluminum garnet) laser system, a wavelength tunable laser system, an aerosolization system, a spectrum collection system and a computer, wherein the aerosolization system is used for producing an aerosol from a solution to be analyzed; the Nd. YAG laser is used for producing a high-energy laser beam and focusing the laser beam on the aerosol to excite plasma flame; the wavelength tunable laser system is used for producing a pumped laser beam with required resonance excitation wavelength and focusing the laser beam on the plasma flame to produce a resonance excitation effect; and the spectrum collection system is used for collecting characteristic spectral signals produced after resonance excitation, converting the spectral signals to electric signals and then transmitting the electric signals to the computer to analyze substance components in the solution. The system can overcome the shortcomings of the prior art, greatly improve the detection sensitivity of an LIBS (laser induced breakdown spectroscopy) technology in detection of trace elements in the solution, achieve the requirements of actual applications in the fields of environmental monitoring and the like and simultaneously perform online precise qualitative and quantitative analysis of substances in a liquid.
Description
Technical field
The invention belongs to constituent analysis and detection technique field, be specially a kind of laser probe analytical instrument based on aerosolization, be mainly used in the accurate qualitative and quantitative analysis of material composition in solution.
Background technology
Laser probe technology, be Laser-induced Breakdown Spectroscopy (Laser-Induced breakdown Spectroscopy, be called for short LIBS) technology, it is a kind of novel atomic emission spectrum technology, it utilizes the laser beam bombardment analyte of high-energy-density to produce plasma, by gathering the characteristic spectrum of plasma emission and it being analyzed, and then obtain a kind of novel elemental analysis technology of the contained element kind of analyte and content.LIBS technology have without sample pretreatment, multielement detect simultaneously and can be online, in real time, the advantage such as remote detection, since being born, paid close attention to widely so far always.Important achievement in research has all been obtained in the fields such as it is explored in biomedical research, military security, cosmic space, industrial processes flow process is controlled, environmental pollution detection in real time.
LIBS technology has obtained many great achievements when detecting solid sample, and this important solid sample form stable that is can keep stable for a long time when with laser interaction.But when utilizing LIBS technology to detect analysis to the element in solution, also there are following 4 problems: 1,, when laser action arrives liquid surface, easily produce liquid sputter, pollute optical measuring system; 2, the fluid behaviour of liquid self makes the shock wave producing in laser and the interactional process of liquid can make liquid level produce ripple, affects the accuracy of laser focusing focal length, has reduced the repeatability of test; 3, the sputter liquid producing after laser excitation can absorb or block the light that plasma emission goes out, the accuracy that impact is surveyed; 4, laser pulse can produce bubble at liquid internal, and these bubbles can change the characteristic of the plasma that laser excitation produces at liquid surface.
Chinese patent literature < < gas, liquid coupling Laser-induced Breakdown Spectroscopy pick-up unit and detection method > > (publication number is CN102914522A, and open day is on February 6th, 2013) disclose a kind of gas, liquid coupling Laser-induced Breakdown Spectroscopy pick-up unit that overcomes the problems that cause because of liquid self character.Its structure is: gas-liquid coupling chamber, gas liquid two purpose pump and high-pressure atomization pump, gas-liquid coupling chamber comprises the housing that is inlaid with taper gas-liquid recirculatory pipe in base plate, gas-liquid recirculatory pipe is provided with the aperture communicating with enclosure interior, the other end communicates with outside, case top has air intake opening and atomizer, on adjacent two sidewalls of housing, is separately installed with into light pipe and photometry pipe; Enter light pipe axis and photometry tubular axis line perpendicular and be positioned at same level, two axial lines intersection point and atomizer axes intersect; Connect high-pressure atomization pump and atomizer.This device is for analyzing the content of liquids and gases and dust granules thing element, also can real time and on line monitoring environment water pollute and but atmospheric pollution this device still exist that following some is not enough: 1, this apparatus structure complexity, easily produces unpredictable pollution to sample; 2, the gasoloid producing is not carried out to effectively constraint and control, this can cause the fluctuation of breakdown point, thereby causes repeatability and the accuracy of experiment not high; 3, cannot overcome the not high problem of monopulse LIBS technology for detection sensitivity, be difficult to be applied in reality.
In a word, existing LIBS technology is when analyzing component in solution, and the unfavorable factors such as the undulatory property of solution and splashing property make that spectral signal is extremely unstable, the life-span of plasma shortens dramatically.Repeatability, accuracy and the detection sensitivity of experiment are all not high.
Summary of the invention
The invention provides a kind of laser microprobe analysis instrument based on aerosolization and resonance excitation, object is to overcome the drawback of prior art, significantly improve the detection sensitivity of LIBS technology trace element in detecting solution, to reach the requirement of the practical application in the fields such as environmental monitoring, can also carry out online accurate qualitative and quantitative analysis to the material in liquid simultaneously.
A kind of laser probe analytical instrument provided by the invention, the analysis for solution material composition, is characterized in that, it comprises Nd.YAG Optical Maser System, wavelength tunable laser system, aerosolization system, spectra collection system and computing machine; Aerosolization system is for making solution to be analyzed produce gasoloid; Nd.YAG Optical Maser System is for generation of high energy laser beam, and focuses on described gasoloid and make it inspire plasma flame; Wavelength tunable laser system is for generation of the laser pulse of specific wavelength, for the characteristic spectral line of required analytical element is carried out to resonance excitation enhancing; The physical dimension of the hot spot of this laser pulse need be greater than the physical dimension of plasma, can cover whole plasma; The characteristic spectrum signal that spectra collection system produces afterwards for gathering resonance excitation, and after being converted into electric signal, be transferred to computing machine, the material composition of the spectral signal analytical solution that computing machine receives for basis.
Particularly, the present invention has following technical characterstic:
(1) first feature of the present invention adopts aerosolization system, solution can be transformed into gasoloid.When traditional LIBS technology detects analysis to the element in solution, the shock wave producing not only easily makes liquid splash pollute optical lens, easily make liquid level occur fluctuation, beating appears in the focus that makes to focus, and has a strong impact on accuracy and the repeatability of spectra collection simultaneously.When laser and solution effects, laser energy major part is used to the vaporization of solution, only have the energy of small part to be used to produce plasma, in laser and the interactional process of solution, there will be Quenching that the life-span of the plasma of generation is shortened dramatically simultaneously, characteristic spectrum decay is too fast, extremely unfavorable to the collection of characteristic spectrum.
When solution is become to gasoloid, when laser and gasoloid interact, effectively overcome and splashed and pollution optical lens that wave phenomenon is brought and the problem of beating of breakdown point, improved accuracy and the repeatability surveyed; In addition because liquid under the effect of assist gas has been shredded into tiny gasoloid, become vaporificly, improved laser utilization factor, avoided Quenching simultaneously, extended the life-span of plasma.The present invention has utilized this technical characterstic just, adopts the existing LIBS system of aerosolization system supplymentary, and the gasoloid that atomizer changes into solution aerosol sprays along fixing direction under the guiding of assist gas, has formed a tiny gasoloid post.When laser and gasoloid interact, effectively overcome the adverse effect that solution sputter and fluctuation bring, meanwhile, due to aerocolloidal molecule, more abundant to the absorption of laser, laser utilization factor greatly improves.Quenching disappears substantially, and the life-span of plasma has obtained effective prolongation.
(2) second feature of the present invention is to adopt fixed wave length pulsed laser to combine with Wavelength tunable laser.Traditional LIBS technology for detection sensitivity is not high, and accuracy and repeatability are also undesirable.One of the main reasons is the interference from matrix element and high-load element spectral line, strong many of spectral line that the spectrum that matrix element and high-load element produce produces with respect to the element of low content, to such an extent as to the spectral line that Minor element is produced is covered; It is former therefore that two to be different elements different to the absorption efficiency of the LASER Light Source of Same Wavelength, make some element to the absorption of laser energy lacking extremely, thereby the spectral line producing too a little less than, the spectral line of being launched by other elements is covered.
When the electronics intrinsic transition energy of the laser photon energy for exciting and detected element approaches, the probability of this intrinsic transition can be large by jumbo change, this is the effect due to stimulated radiation, it is that laser resonant excites that this process becomes laser-induced fluorescence spectroscopy, certificate of the present invention has utilized this technical characterstic of resonance excitation, adopting tunable laser, as the second excitation source, the plasma being produced by the first fixed wave length LASER Light Source is carried out to secondary optionally excites, for the element of analyzing, carry out optionally resonance excitation, the spectral line of its transmitting is significantly strengthened, this by the reduction of maximum possible the interference of matrix element and high-load element spectral line, thereby improved greatly the detection limit of laser probe in solution.And then can carry out accurate qualitative and quantitative analysis to the element in solution.
(3) recovery system is interior with condenser pipe, can not collect not giving to condense with the interactional gasoloid of laser pulse, by conduit, is back in planchet, can improve the utilization factor of solution example; Because liquid aerosolization process time is very short, perfectly in harmony with the fast detecting characteristic of laser probe, both have fabulous compatibility again.
(4) recovery system has guaranteed that solution can not volatilize or be splashed in air, when the element that ought will analyze is like this poisonous element, and the operating instrument that experimenter can be safe, and do not worry poisoning.Thereby guaranteed laboratory technician's safety.This detection that is those poisonous elements provides detection method safely and effectively.
In sum, compare with the laser probe equipment of element in current analytical solution, the present invention has following advantage: (1) is used aerosolization system, solution is become to aerocolloidal form, got rid of due to solution fluctuation and splash the pollution optical lens bringing and the problem of beating that focuses on focus, Quenching disappears substantially, and laser utilization factor greatly improves, and the life-span of plasma has obtained effective prolongation; (2) use tunable wavelength laser instrument to carry out secondary excitation, can effectively strengthen the element spectral line that needs analysis, improve signal to noise ratio (S/N ratio), improved greatly detection sensitivity; (3) can reclaim sample, can realize fast, real-time online detection simultaneously.(4) avoided the harm of poisonous element to laboratory technician.
Accompanying drawing explanation
Fig. 1 is the structural representation of the first embodiment of laser microprobe analysis instrument provided by the invention;
The position enlarged drawing of Fig. 1 in Fig. 2;
Fig. 3 is the structural representation of the second embodiment of laser microprobe analysis instrument provided by the invention;
Fig. 4 is the structural representation of the third embodiment of laser microprobe analysis instrument provided by the invention;
Fig. 5 is the structural representation of the 4th kind of embodiment of laser microprobe analysis instrument provided by the invention;
In figure, 1.Nd:YAG laser instrument; 2. Wavelength tunable laser; 3. atomizer; 4. grating spectrograph; 5. enhancement mode CCD; 6. digital delay generator; 7. display; 8. computing machine; 9. planchet; 10. catheter; 11. recovery systems; 12. sources of the gas; 13. collection heads; 14. first workbenches; 15. second workbenches; 16. diaphragms; 17. diaphragms; 18. focusing objective lens; 19. focusing objective lens; 20. semi-transparent semi-reflecting lens; 21. optical fiber; 22. control cables; 23. control cables; 24. control cables; 25. control cables; 26. trestle tables; 27. catheters; 28. wireways; 29. control cables; 30. operation valves; 31. catheters; 32. condenser pipes; 33. taper wireways; 34. filter absorption mesh; 35. exhaust fans.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described further.At this, it should be noted that, for the explanation of these embodiments, be used for helping to understand the present invention, but do not form limitation of the invention.In addition,, in each embodiment of described the present invention, involved technical characterictic just can not combine mutually as long as do not form each other conflict.
As shown in Figure 1, the laser probe analytical instrument that example of the present invention provides mainly comprises Nd.YAG laser instrument 1, Wavelength tunable laser 2, atomizer 3, grating spectrograph 4, enhancement mode CCD5, recovery system 11 and computing machine 8 etc.
Nd.YAG laser instrument 1 light-emitting window, aperture 16 and semi-transparent semi-reflecting lens 20 in same level light path, semi-transparent semi-reflecting lens 20 becomes miter angle to place with horizontal optical path direction, be fixed on trestle table 26.
The light-emitting window of Wavelength tunable laser 2, aperture 17 and focusing objective len 18 are in same level light path.
The injection port of atomizer 3 is connected with peristaltic pump 7 by catheter 27, and peristaltic pump 7 is connected with sample cell 9 by catheter 31.Air intake opening is connected with gas cylinder 12 by wireway 28.
The center of the Pen Yangkou center of atomizer 3 and the entrance of recovery system 11 is in being same as on surface level.
Nd:YAG laser instrument 1, Wavelength tunable laser 2 and enhancement mode CCD5 are connected with digital delay generator 6 by control cables 23, control cables 24, control cables 22 respectively.
Semi-transparent semi-reflecting lens 20, focusing objective len 19, collection head 13 are separately fixed on trestle table 26.
Nd:YAG laser instrument 1 can be launched the laser pulse of four kinds of wavelength, is respectively 1064nm, 532nm, 355nm, 266nm, can select one of them to use according to different samples.The Main Function of Nd:YAG laser instrument 1 is transmitting High Power Laser Pulses, focuses in the gasoloid being ejected by atomizer 3 and inspires plasma; Wavelength tunable laser 2 used can be launched the laser pulse of any wavelength between 200nm～2000nm, its Main Function is to carry out optionally resonance excitation to focused on the element of the required analysis in the plasma inspiring in gasoloid by Nd:YAG laser instrument 1, resonance excitation can make the spectral line that will analyze significantly be strengthened, signal to noise ratio (S/N ratio) is greatly improved, thereby gets rid of the interference of other elements to required analytical element spectral line signal.
The effect of aperture 16 and aperture 17 is that the laser pulse of respectively Nd:YAG laser instrument 1 and Wavelength tunable laser 2 being launched carries out spatial filtering, eliminate the high-order mode in laser pulse, retain its low-order mode, make the plasma of generation more stable.
The effect of focusing objective len 18 is that the laser pulse that Wavelength tunable laser is launched focuses on.
Focusing objective len 19 has two effects, and one is that the laser pulse that Nd:YAG laser instrument 1 is launched focuses on; It makes spectral information can enter smoothly collection head two for collecting the spectral information launched by plasma flame.
The laser pulse that semi-transparent semi-reflecting lens 20 is launched for reflecting Nd:YAG laser instrument 1, the spectrum of its all band of transmission simultaneously except laser pulse.
Atomizer 3 can adopt concentric high-purity quartz atomizer.Atomizer 3 links together the wireway of different bores by X-over, then is connected to gas cylinder 12.Gas cylinder 12 can adopt argon gas or other gas, specifically according to experiment demand, selects.The argon bottle that this example mesohigh gas cylinder 12 adopts with pressurizing valve and micro-flowmeter.Atomizer 3 is connected with planchet 9 by the peristaltic pump 7 of adjustable solution flow rate.The argon gas that argon bottle provides, carrying out atomization from the solution example of peristaltic pump 7 supplies, ejects gasoloid, controls the flow velocity of argon gas by the argon gas reduction valve in adjusting argon bottle, when the gasoloid amount producing reaches maximal value, keeps the flow velocity of argon gas constant.
Single gasoloid being ejected by atomizer is awl type and disperses, not only unstable, and distribution does not have rule very much yet, here can be by regulating the control valve on the taper wireway 33 in recovery system 11 to regulate the size of air intake opening and the characteristic of controlling gasoloid post by the velocity of rotation of adjusting exhaust fan 35, make the gasoloid can be more stable, can form gasoloid post, this gasoloid post can be very stable under the effect of contraction of exhaust fan suction existence, when being adjusted to suitable time, can become reducing-pitch thread by original distributing, being conducive to laser pulse focuses on and punctures it, can effectively overcome the not high problem of experimental repeatability causing because focusing on focus fluctuation, like this, when laser pulse and gasoloid interaction, the plasma producing will be very stable.Detection limit be can effectively improve, accuracy and the repeatability of experiment improved.
Digital delay pulse producer 6 is mainly used in controlling the time delay of Nd:YAG laser instrument 1 and Wavelength tunable laser 2 outgoing beams, controls the time delay that enhancement mode CCD5 accepts spectroscopic data simultaneously;
The concrete operation step of the laser probe liquor analysis instrument of said structure is as follows:
1. open exhaust fan and control software, and check whether the variable valve of adjusting taper wireway 33 can normally work.After guaranteeing normally to work, enter following operation.
2. the solution that will analyze is poured in planchet 9, catheter 27 is inserted in solution, opening peristaltic pump makes it in running order, keep the unimpeded of catheter 27, slowly open the argon gas reduction valve on gas cylinder 12, until see when the outlet of atomizer has sprayed gasoloid, regulate the rotating speed of peristaltic pump 7, control the flow velocity of solution, when the gasoloid producing is more stable, stop regulating argon gas reduction valve and peristaltic pump 7 on gas cylinder 12.
3. according to the element in the solution that will analyze, determine most suitable optical maser wavelength (one of 1064nm, 532nm, 355nm, 266nm tetra-wavelength), install the frequency-doubling crystal module on the corresponding Nd:YAG laser instrument 1 of required optical maser wavelength, open Nd:YAG laser instrument 1, the high energy laser beam of this Laser output is successively by diaphragm 16, semi-transparent semi-reflecting lens 20 and focusing objective len, focus on the gasoloid post being produced by atomizer, inspire plasma flame.
4. according to the element that will analyze, determine needed resonance excitation wavelength, open the pumping of Wavelength tunable laser 2, the output wavelength of this laser instrument is adjusted to the wavelength of needed resonance excitation, by predefined delay time, digital delay generator 6 sends a trigger pip to Wavelength tunable laser 2, make it by adjusted good wavelength outgoing laser beam, by aperture 17 and focusing objective len 18, focus on the plasma being produced by Nd:YAG laser instrument 1 successively, carry out resonance excitation effect.
5. the characteristic spectrum signal that plasma produces after resonance excitation is transformed into directional light after by focusing objective len 19 and enters collection head 13 by semi-transparent semi-reflecting lens 20, then is sent in grating spectrograph 4 by optical fiber 21.
6. the characteristic spectrum signal that 4 pairs of grating spectrographs receive decomposes, spectral signal after decomposing is sent to enhancement mode CCD5, enhancement mode CCD5 gathers spectral signal with gate-width and the time delay setting, and the spectral signal that collects is amplified and is converted into electric signal and is transferred to computing machine 8 by data line.
7. computing machine 8 carries out qualitative and quantitative analysis by the spectral analysis software carrying to the spectral signal collecting, and by control cables 25, is connected to display 30 and shows.
8. by above-mentioned steps, complete and quantitative test qualitative to the high precision of component in solution.
Fig. 2 is the details enlarged drawing in Fig. 1.Fig. 2 is the details enlarged drawing in Fig. 1.Can see clearly the structure of recovery system 11 in the drawings.Recovery system comprises taper wireway 33, condenser pipe 32, exhaust fan 35, the screen pack 34 with bore variable valve.Aerocolloidal characteristic is mainly by regulating taper wireway 33 bore variable valve and exhaust fan 35 to control.The sample being condensed flows out by the fluid guidance port of taper wireway 33.
The present invention can also adopt the embodiment shown in Fig. 3, the difference of itself and Fig. 1, be to have replaced coaxial acquisition mode with paraxonic acquisition mode, implementation process, for collection head is moved to the position angled with vertical optical path, changes total reflective mirror 36 into semi-transparent semi-reflecting lens 20 simultaneously.This mode is due to the process gathering, and the characteristic spectrum information that plasma emission goes out does not need by semi-transparent semi-reflecting lens 20, and some wave band can be by filtering, and the spectrum of collection is eager to excel a lot.
For simplified structure, the present invention can also adopt structure shown in Fig. 4, the key distinction of itself and Fig. 1, Fig. 3 is the light path coaxial of the light path of Nd:YAG laser instrument 1 and Wavelength tunable laser, wherein omitted focusing objective len 19, increased a completely reflecting mirror 36, it is compacter that design can make laser probe equipment like this, is convenient to carrying.
In addition, the present invention can also adopt the structure shown in Fig. 5, wherein, in the bright dipping light path of Nd.YAG laser instrument 1, is placed with semi-transparent semi-reflecting lens 20, and semi-transparent semi-reflecting lens 20 becomes miter angle to place with horizontal optical path direction; On the transmitted light path of semi-transparent semi-reflecting lens 20, be furnished with focusing objective len 18; In the bright dipping light path of Wavelength tunable laser 2, be provided with the total reflective mirror parallel with semi-transparent semi-reflecting lens 20 36;
The injection port of atomizer 3 is connected with peristaltic pump 7 by catheter 27, and the air intake opening of atomizer 3 is connected with gas cylinder 12 by wireway 28; Recovery system 11 is connected with planchet 9 by catheter 10; The spray sample mouth of atomizer 3 is positioned at the top of the entrance of recovery system 11; Collection head 13 is paraxonic acquisition mode.The maximum of this structure is characterised in that an aerosolization system has become vertical placement with recovery system, and focused light passages has become horizontal positioned, and this structure is in a kind of improvement project of having considered that gasoloid is proposed by the impact of gravity.
In a word, the present invention can carry out high-precision qualitative and quantitative analysis to the material of solution morphology.First, owing to having adopted aerosolization system, liquid rotating has been changed into aerocolloidal form, effectively overcome liquid splash and polluted optical lens, liquid fluctuating and affect the problems such as the stability of spectral signal, plasma lifetime that Quenching causes is too short, improve to a great extent the detection limit of laser microprobe analysis solution material, improved accuracy and the repeatability of experiment; Secondly, adopt resonance excitation auxiliary laser probe analysis solution material, reduced the interference of matrix element, so improved the signal to noise ratio (S/N ratio) of analytical element spectral line, improved greatly the detection limit of laser probe at analytical solution material.
The above is preferred embodiment of the present invention, but the present invention should not be confined to the disclosed content of this embodiment and accompanying drawing.So every, do not depart from the equivalence completing under spirit disclosed in this invention or revise, all falling into the scope of protection of the invention.
Claims (9)
1. a laser probe analytical instrument, the analysis for solution material composition, is characterized in that, it comprises Nd.YAG Optical Maser System, wavelength tunable laser system, aerosolization system, spectra collection system and computing machine; Aerosolization system is for making solution to be analyzed produce gasoloid; Nd.YAG Optical Maser System is for generation of high energy laser beam, and focuses on described gasoloid and make it inspire plasma flame; Wavelength tunable laser system is for generation of the laser pulse of specific wavelength, for the characteristic spectral line of required analytical element is carried out to resonance excitation enhancing; The physical dimension of the hot spot of this laser pulse is greater than the physical dimension of plasma, can cover whole plasma; The characteristic spectrum signal that spectra collection system produces afterwards for gathering resonance excitation, and after being converted into electric signal, be transferred to computing machine, the material composition of the spectral signal analytical solution that computing machine receives for basis.
2. laser probe analytical instrument according to claim 1, it is characterized in that, described aerosolization system comprises atomizer (3), recovery system (11), peristaltic pump (7) and with the source of the gas (12) of operation valve, the injection port of atomizer (3) is connected with peristaltic pump (7) by catheter (27), and peristaltic pump (7) is for regulating the interior solution flow rate of planchet (9); Air intake opening is connected with source of the gas (12) by wireway (28), and recovery system (11) is communicated with planchet (9) by pipeline, for reclaiming unnecessary aerocolloidal recovery system (11); The entrance of the spray sample mouth of atomizer (3) and recovery system (11) is in being same as on surface level.
3. laser probe analytical instrument according to claim 1, is characterized in that, recovery system (11) comprises taper wireway (32), condenser pipe (31), exhaust fan (34), the screen pack (33) with variable valve; One end of condenser pipe (31) is connected with the taper wireway (32) with bore variable valve, and the other end is provided with exhaust fan (34), between condenser pipe (31) and exhaust fan (34), is provided with screen pack (33); By controlling the size of air intake opening of taper wireway (32) and the characteristic that the velocity of rotation of adjusting exhaust fan (34) can be controlled gasoloid post, make gasoloid more stable, form gasoloid post.
4. laser probe analytical instrument according to claim 1, is characterized in that, described spectra collection system comprises collection head (13), grating spectrograph (4) and enhancement mode CCD (5); Collection head (13) is connected with grating spectrograph (4) by optical fiber (21), and grating spectrograph (4) is connected with enhancement mode CCD (5), and enhancement mode CCD (5) is connected with spectroscopic analysis system electric signal; Collection head (13) is paraxonic acquisition mode or coaxial acquisition mode.
5. a kind of laser probe analytical instrument claimed in claim 1, it is characterized in that, its concrete structure comprises Nd.YAG laser instrument (1), Wavelength tunable laser (2), atomizer (3), grating spectrograph (4), enhancement mode CCD (5), recovery system (11) and computing machine (8);
The light-emitting window of Nd.YAG laser instrument (1), aperture (16) and semi-transparent semi-reflecting lens (20) are positioned in a horizontal optical path, and semi-transparent semi-reflecting lens (20) becomes miter angle to place with horizontal optical path direction; On the reflected light path of semi-transparent semi-reflecting lens (20), be furnished with focusing objective len (19);
The light-emitting window of Wavelength tunable laser (2), aperture (17) and focusing objective len (18) are positioned in another horizontal optical path;
The injection port of atomizer (3) is connected with peristaltic pump (7) by catheter (27), and peristaltic pump 7 is connected with sample cell 9 by catheter 31; The air intake opening of atomizer (3) is connected with source of the gas (12) by wireway (28); Recovery system (11) is connected with planchet (9) by catheter (10); The entrance of the spray sample mouth of atomizer (3) and recovery system (11) is in being same as on surface level;
Collection head (13) is coaxial acquisition mode, and it is connected with grating spectrograph (4) by optical fiber (21), and grating spectrograph (4) is connected with enhancement mode CCD (5), and enhancement mode CCD (5) is connected with computing machine (8);
Nd:YAG laser instrument (1), Wavelength tunable laser (2) and enhancement mode CCD (5) are connected with digital delay generator (6) electric signal respectively;
Collection head (13) and focusing objective len (19) are for gathering spectrum, the spectral information collecting is passed to grating spectrograph (4) by optical fiber (21), and grating spectrograph (4) and enhancement CCD (5) process spectral information;
Digital delay pulse producer (6) is mainly used in controlling the time delay of Nd:YAG laser instrument (1) and Wavelength tunable laser (2) outgoing beam, controls the time delay that enhancement mode CCD (5) accepts spectroscopic data simultaneously;
Computing machine (8) is worked for control figure delay pulse generator (6) and recovery system (11), and the signal of enhancement CCD (5) is carried out to analyzing and processing.
6. laser probe analytical instrument according to claim 5, is characterized in that, described semi-transparent semi-reflecting lens (20) replaces to total reflective mirror (36), and described collection head replaces with paraxonic acquisition mode.
7. a kind of laser probe analytical instrument claimed in claim 1, it is characterized in that, its concrete structure comprises Nd.YAG laser instrument (1), Wavelength tunable laser (2), atomizer (3), grating spectrograph (4), enhancement mode CCD (5), recovery system (11) and computing machine (8);
The light-emitting window of Nd.YAG laser instrument (1), aperture (16) and semi-transparent semi-reflecting lens (20) are positioned in a horizontal optical path, and semi-transparent semi-reflecting lens (20) becomes miter angle to place with horizontal optical path direction;
The light-emitting window of Wavelength tunable laser (2) and total reflective mirror (36) are positioned in another horizontal optical path; Total reflective mirror (35) is arranged in parallel with semi-transparent semi-reflecting lens (20), is furnished with focusing objective len (19) on their reflected light path;
The injection port of atomizer (3) is connected with peristaltic pump (7) by catheter (27), and the air intake opening of atomizer (3) is connected with source of the gas (12) by wireway (28); Recovery system (11) is connected with planchet (9) by catheter (10); The entrance of the spray sample mouth of atomizer (3) and recovery system (11) is in being same as on surface level;
Collection head (13) is paraxonic acquisition mode, collection head (13) is connected with grating spectrograph (4) by optical fiber (21), grating spectrograph (4) is connected with enhancement mode CCD (5), and enhancement mode CCD (5) is connected with computing machine (8);
Nd:YAG laser instrument (1), Wavelength tunable laser (2) and enhancement mode CCD (5) are connected with digital delay generator (6) electric signal respectively;
Collection head (13) and focusing objective len (19) are for gathering spectrum, the spectral information collecting is passed to grating spectrograph (4) by optical fiber (21), and grating spectrograph (4) and enhancement CCD (5) process spectral information;
Digital delay pulse producer (6) is mainly used in controlling the time delay of Nd:YAG laser instrument (1) and Wavelength tunable laser (2) outgoing beam, controls the time delay that enhancement mode CCD (5) accepts spectroscopic data simultaneously;
Computing machine (8) is worked for control figure delay pulse generator (6) and recovery system (11), and the signal of enhancement CCD (5) is carried out to analyzing and processing.
8. a kind of laser probe analytical instrument based on aerosolization according to claim 1, it is characterized in that, it comprises Nd.YAG laser instrument (1), Wavelength tunable laser (2), atomizer (3), grating spectrograph (4), enhancement mode CCD (5), recovery system (11) and computing machine (8);
In the bright dipping light path of Nd.YAG laser instrument (1), be furnished with semi-transparent semi-reflecting lens (20), semi-transparent semi-reflecting lens (20) becomes (45) degree angle to place with horizontal optical path direction, be furnished with focusing objective len (18) on the transmitted light path of semi-transparent semi-reflecting lens (20);
The bright dipping light path parallel of the bright dipping light path of Wavelength tunable laser (2) and Nd.YAG laser instrument (1), and be furnished with the total reflective mirror (35) parallel with semi-transparent semi-reflecting lens (20);
The injection port of atomizer (3) is connected with peristaltic pump (7) by catheter (27), and the air intake opening of atomizer (3) is connected with source of the gas (12) by wireway (28); Recovery system (11) is connected with planchet (9) by catheter (10); The entrance of the spray sample mouth of atomizer (3) and recovery system (11) is in being same as on surface level;
Collection head (13), semi-transparent semi-reflecting lens (20) and focusing objective len (19) are located on same vertical optical path successively; Collection head (13) is connected with grating spectrograph (4) by optical fiber (21), and grating spectrograph (4) is connected with enhancement mode CCD (5), and enhancement mode CCD (5) is connected with computing machine (8);
Nd:YAG laser instrument (1), Wavelength tunable laser (2) and enhancement mode CCD (5) are connected with digital delay generator (6) electric signal respectively;
Collection head (13) and focusing objective len (19) are for gathering spectrum, the spectral information collecting is passed to grating spectrograph (4) by optical fiber (21), and grating spectrograph (4) and enhancement CCD (5) process spectral information;
Digital delay pulse producer (6) is mainly used in controlling the time delay of Nd:YAG laser instrument (1) and Wavelength tunable laser (2) outgoing beam, controls the time delay that enhancement mode CCD (5) accepts spectroscopic data simultaneously;
Computing machine (8) is worked for control figure delay pulse generator (6) and recovery system (11), and the signal of enhancement CCD (5) is carried out to analyzing and processing.
9. a kind of laser probe analytical instrument claimed in claim 1, it is characterized in that, its concrete structure comprises Nd.YAG laser instrument (1), Wavelength tunable laser (2), atomizer (3), grating spectrograph (4), enhancement mode CCD (5), recovery system (11) and computing machine (8);
In the bright dipping light path of Nd.YAG laser instrument (1), be placed with semi-transparent semi-reflecting lens (20), semi-transparent semi-reflecting lens (20) becomes miter angle to place with horizontal optical path direction; On the transmitted light path of semi-transparent semi-reflecting lens (20), be furnished with focusing objective len (18);
In the bright dipping light path of Wavelength tunable laser (2), be provided with the total reflective mirror (35) parallel with semi-transparent semi-reflecting lens (20);
The injection port of atomizer (3) is connected with peristaltic pump (7) by catheter (27), and the air intake opening of atomizer (3) is connected with source of the gas (12) by wireway (28); Recovery system (11) is connected with planchet (9) by catheter (10); The spray sample mouth of atomizer (3) is positioned at the top of the entrance of recovery system (11);
Collection head (13) is paraxonic acquisition mode, and it is connected with grating spectrograph (4) by optical fiber (21), and grating spectrograph (4) is connected with enhancement mode CCD (5), and enhancement mode CCD (5) is connected with computing machine (8);
Nd:YAG laser instrument (1), Wavelength tunable laser (2) and enhancement mode CCD (5) are connected with digital delay generator (6) electric signal respectively;
Collection head (13) and focusing objective len (19) are for gathering spectrum, the spectral information collecting is passed to grating spectrograph (4) by optical fiber (21), and grating spectrograph (4) and enhancement CCD (5) process spectral information;
Digital delay pulse producer (6) is mainly used in controlling the time delay of Nd:YAG laser instrument (1) and Wavelength tunable laser (2) outgoing beam, controls the time delay that enhancement mode CCD (5) accepts spectroscopic data simultaneously;
Computing machine (8) is worked for control figure delay pulse generator (6) and recovery system (11), and the signal of enhancement CCD (5) is carried out to analyzing and processing.
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