CN102706850A - Calibration method and device based on laser induced plasma spectroscopy and method and device for measuring equivalent ratio of combustible gas to oxidant - Google Patents
Calibration method and device based on laser induced plasma spectroscopy and method and device for measuring equivalent ratio of combustible gas to oxidant Download PDFInfo
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Abstract
The invention relates to a calibration method and a calibration device and a method and a device for measuring equivalent ratio of combustible gas to oxidant, in particular to a calibration method and a calibration device based on laser induced plasma spectroscopy and a method and a device for measuring equivalent ratio of combustible gas to oxidant, aiming at improving the calibration accuracy of the existing calibration method, improving the measuring accuracy of the equivalent ratio of fuel to oxidant in the existing combustion system and improving the convenience in measurement of equivalent ratio of mixed fuel gas. Since plasma fluorescence signal intensity is high, the signal-to-noise ratio is high and the response sensitivity of an ICCD (intensified charge coupled device) which is used as light signal receiving equipment in a spectrograph is high, the measuring accuracy of the method provided by the invention is higher than the measuring accuracy of other existing equivalent ratio measuring method. Since the method is a non-contact measuring method, laser beam and fluorescence signal receiving equipment are not limited by spatial positions and the signals are convenient and rapid to process at a later stage, the method can satisfy the requirement on real-time online measurement. The technical scheme is suitable for the calibration method and the calibration device based on laser induced plasma spectroscopy and the measurement of equivalent ratio of combustible gas to oxidant.
Description
Technical field
The present invention relates to the square law device of calibrating method and device and measurement inflammable gas and oxygenant equivalent proportion.
Background technology
Equivalent proportion is meant the ratio of required oxidant content when the effective supply oxidant content is with fuel perfect combustion in the combustion system.The equivalent proportion of fuel and oxygenant is a very important parameter in the combustion field; Can reactive fuel and the mix of oxygenant; The equivalent proportion at diverse location place is different in the diffusion flame of reality; Be difficult to judge the size of each point equivalent proportion, yet have only under the suitable situation of equivalent proportion, could guarantee fully burning.Therefore, the accurate measurement of equivalent proportion is of great significance for the development of combustion technology.
In the combustion system of reality, like Aero-Space engine, internal combustion engine, industrial burner etc., inflammable gas and oxygenant are injected in the firing chamber and mix, light a fire and burn.Mixed process is crucial, and it is that burning can take place and stable necessary condition.If it is bad that inflammable gas mixes with oxygenant; Do not reach suitable equivalent proportion; Then be difficult to realize igniting and smooth combustion; Therefore, fuel and the mixed process of oxygenant real-time, online to inflammable gas and oxygenant equivalent proportion, that measure for research and control combustion system fast, accurately are very important.
The method of measuring equivalent proportion mainly comprises measuring method and non-optical measuring method.Non-optical measuring method mainly contains the ratio of direct measurement fuel and oxygenant and the gas componant of measuring tail gas indirectly.The deficiency of direct measuring method is that what to obtain is the equivalent proportion before the mixing and burning, can not reflect the equivalent proportion of the fuel and the oxygenant of actual mixing and burning process, and error is bigger.Indirectly measure the method for tail gas, reflection be the equivalent proportion of the integral body of fuel and oxygenant after the combustion process, can not reflect the space and the time regularity of distribution of fuel and oxygenant in the firing chamber.In addition, these two kinds of methods all can't be accomplished real-time online measuring.Measuring method comprises Raman scattering, LIF (LIF) etc.Raman scattering method method signal is weak, signal to noise ratio (S/N ratio) is low, energy of lasers is required high.The LIF method has strict restriction to optical maser wavelength, and complex equipments is expensive, difficult the realization.This shows that how accurate, real-time, online, equivalent proportion that measure fuel and oxygenant easily becomes the active demand of correlative study.
Summary of the invention
The present invention is the measuring accuracy for fuel and oxygenant equivalent proportion in the precision of the calibration that improves existing calibrating method, the existing combustion system of raising; And improve the convenient degree that the air mixture equivalent proportion is measured, thereby provide a kind of based on laser induced plasma spectral measurement inflammable gas and oxygenant equivalent proportion method and realize the device of this method.
Steps A, inflammable gas, oxygen and nitrogen fed mix gas tank, form mixed gas, and control the flow of said inflammable gas, oxygen and nitrogen respectively;
Step B, the mixed gas that forms in the steps A is fed the quartz glass pipe, and said mixed gas is flowed out from the mouth of pipe of quartz glass pipe;
Step C, employing laser instrument send laser beam, and said laser beam is focused on nozzle position described in the step B, puncture the mixed gas that the mouth of pipe flows out, and produce plasma, and said plasma sends fluorescence signal;
Step D, plasma described in the step C sent fluorescence signal adopt condenser lens to focus on the inlet of optical fiber, this optical fiber with the optical signal transmission of its inlet incident to spectrometer; The fluorescence signal that adopts the Computer Analysis spectrometer to gather obtains plasma spectrometry;
H characteristic peak described in step e, the obtaining step D in the plasma spectrometry and O characteristic peak, and calculate the intensity rate of said H characteristic peak and O characteristic peak;
Step F, the described inflammable gas of change steps A, oxygen and nitrogen flow and mixed gas equivalent proportion M time, repeated execution of steps A obtains the intensity rate of M H characteristic peak and O characteristic peak respectively to step e after each the change;
According to M+1 the H characteristic peak that obtains and the intensity rate acquisition spectral intensity ratio of O characteristic peak and the linear relationship of equivalent proportion, completion is based on the calibration of laser induced plasma spectrum; M is the integer greater than 2.
The laser of laser instrument output is that monopulse or repetition frequency are the multi-pulse laser of 1-1000Hz among the step C, and the output laser center wavelength is 532nm; Laser pulse width is 10ns; Laser energy is between 3mJ to 10mJ.
The response wave band of spectrometer is 200nm to 1000nm among the step D; The electrooptical device that uses in the said spectrometer is ICCD, and said ICCD adopts laser pulse to carry out the triggering collection signal, and its gate-width time is 10ns ~ 500ns.
Each scope that changes the mixed gas equivalent proportion is between 0.2 to 2.0 in the step F.
Realize the robot scaling equipment based on laser induced plasma spectrum of said method, it comprises fuel gas cylinder, oxygen gas cylinder, nitrogen gas cylinder, a flowmeter, No. two flowmeters, No. three flowmeters, mixed gas tank, quartz glass pipe, a laser instrument, a condenser lens, No. two condenser lenses, an optical fiber, a spectrometer and computing machines;
Charge into inflammable gas in the fuel gas cylinder, charge into oxygen in the oxygen gas cylinder, charge into nitrogen in the nitrogen gas cylinder; The gas outlet of the gas outlet of the gas outlet of said fuel gas cylinder, oxygen gas cylinder and nitrogen gas cylinder is communicated with three air intake openings of mixed gas tank respectively; A flowmeter, No. two flowmeters and No. three flowmeters are separately positioned on the gas outlet of fuel gas cylinder, the gas outlet of oxygen gas cylinder and the place, gas outlet of nitrogen gas cylinder; The gas outlet of mixing gas tank is communicated with the terminal air intake opening of quartz glass pipe;
The laser beam that laser instrument sends is incident to condenser lens No. one, focuses to the mouth of pipe of quartz glass pipe through condenser lens, is used to puncture the mixed gas that this mouth of pipe flows out, and produces plasma, and said gas ions is sent fluorescence signal;
No. two condenser lenses of fluorescence signal warp that said plasma sends focus to an end of an optical fiber, and the other end of an optical fiber is connected with the light signal receiving end of a spectrometer; The spectral signal output terminal of a said spectrometer is connected with the spectral signal input end of a computing machine.
Based on the method for laser induced plasma spectral measurement inflammable gas and oxygenant equivalent proportion, it is realized by following steps:
Step 1, employing laser instrument send laser beam, and this laser beam is focused in the target combustion device, puncture inflammable gas to be measured and oxygenant in the target combustion device, produce plasma; Said plasma sends fluorescence signal;
H characteristic peak described in step 3, the obtaining step two in the plasma spectrometry of inflammable gas to be measured and oxygenant and O characteristic peak; Calculate said H characteristic peak and O characteristic peak intensity rate, and obtain the equivalent proportion of gas to be measured according to the linear relationship of spectral intensity ratio and equivalent proportion.
Inflammable gas to be measured described in the step 1 is hydrocarbon fuel or hydrogen fuel.
The laser of laser instrument output is that monopulse or repetition frequency are the multi-pulse laser of 1-1000Hz in the step 1, and the output laser center wavelength is 532nm; Laser pulse width is 10ns; Laser energy is between 3mJ to 10mJ (3mJ punctures the threshold value that produces plasma).
The electrooptical device that uses in the said spectrometer is ICCD, and said ICCD adopts laser pulse to carry out the triggering collection signal, and its gate-width time is 10ns ~ 500ns.
Realize the measurement inflammable gas of said apparatus and the device of oxygenant equivalent proportion; It comprises No. two laser instruments, No. three condenser lenses, burner, No. four condenser lenses, No. two optical fiber, No. two spectrometers and No. two computing machines, charges into inflammable gas to be measured and oxygenant in the burner;
The laser beam that No. two laser instruments go out is incident to condenser lens No. three, focuses to burner through No. three condenser lenses, and punctures inflammable gas to be measured and oxygenant in the burner, produces plasma; Said plasma sends fluorescence signal;
Fluorescence signal that said plasma sends focuses to an end of No. two optical fiber through No. four condenser lenses, and the other end of No. two optical fiber is connected with light signal receiving end to No. two spectrometers; The spectral signal output terminal of said No. two spectrometers is connected with the spectral signal input end of No. two computing machines.
Beneficial effect: calibration precision of the present invention is high; And, propose to measure the method for equivalent proportion through measuring above-mentioned plasma light spectral intensity based on the inflammable gas of calibration acquisition and the linear relationship of isoionic characteristic spectrum intensity of the breakdown generation of oxygenant and equivalent proportion.Because the plasma fluorescence signal is strong, signal to noise ratio (S/N ratio) is high, and the CCD response as the light signal receiving equipment in the spectrometer is sensitive high, so this method measuring accuracy is higher than other existing equivalent proportion measuring methods.This method is a contactless measurement, and laser beam and fluorescence signal receiving equipment are not limited by the locus, and the later stage convenient signal treatment is quick, so this method can satisfy the requirement of real-time online measuring; The laser induced plasma process does not have the available common commercial lasers device of strict demand to optical maser wavelength; The plasma fluorescence signal is strong; Spectrometer and detector are not had specific (special) requirements, and equivalent proportion and fluorescence signal are linear, and signal Processing is simple; So this method is more convenient than other measuring methods, cost is lower.
Description of drawings
Fig. 1 is the structural representation of the robot scaling equipment based on laser induced plasma spectrum of the present invention; Fig. 2 is the structural representation of the device of measurement inflammable gas of the present invention and oxygenant equivalent proportion; Fig. 3 is the theoretical model synoptic diagram that equivalent proportion of the present invention is measured.
Embodiment
Embodiment one, based on the calibrating method of laser induced plasma spectrum, it is realized by following steps:
Steps A, inflammable gas, oxygen and nitrogen fed mix gas tank, form mixed gas, and control the flow of said inflammable gas, oxygen and nitrogen respectively;
Step B, the mixed gas that forms in the steps A is fed the quartz glass pipe, and said mixed gas is flowed out from the mouth of pipe of quartz glass pipe;
Step C, employing laser instrument send laser beam, and said laser beam is focused on nozzle position described in the step B, puncture the mixed gas that the mouth of pipe flows out, and produce plasma, and said plasma sends fluorescence signal;
Step D, plasma described in the step C sent fluorescence signal adopt condenser lens to focus on the inlet of optical fiber, this optical fiber with the optical signal transmission of its inlet incident to spectrometer; The fluorescence signal that adopts the Computer Analysis spectrometer to gather obtains plasma spectrometry;
H characteristic peak described in step e, the obtaining step D in the plasma spectrometry and O characteristic peak, and calculate the intensity rate of said H characteristic peak and O characteristic peak;
Step F, the described inflammable gas of change steps A, oxygen and nitrogen flow and mixed gas equivalent proportion M time, repeated execution of steps A obtains the intensity rate of M H characteristic peak and O characteristic peak respectively to step e after each the change;
According to M+1 the H characteristic peak that obtains and the intensity rate acquisition spectral intensity ratio of O characteristic peak and the linear relationship of equivalent proportion, completion is based on the calibration of laser induced plasma spectrum; M is the integer greater than 2.
The laser of laser instrument output is that monopulse or repetition frequency are the multi-pulse laser of 1-1000Hz among the step C, and the output laser center wavelength is 532nm; Laser pulse width is 10ns; Laser energy is between 3mJ to 10mJ.
The response wave band of spectrometer is 200nm to 1000nm among the step D; The electrooptical device that uses in the said spectrometer is ICCD, and said ICCD adopts laser pulse to carry out the triggering collection signal, and its gate-width time is 10ns ~ 500ns.
ICCD (ICCD is enhancement mode CCD, is the electrooptical device in the used spectrometer) carries out the triggering collection signal by laser pulse, and the gate-width time is 10ns ~ 500ns.The setting of this gate-width can reach following effect: 1, the time-domain filtering denoising is effective; 2, guarantee enough hyperfluorescence signals; 3, guarantee real-time online property.
Each scope that changes the mixed gas equivalent proportion is between 0.2 to 2.0 in the step F.
Embodiment two, realize the robot scaling equipment based on laser induced plasma spectrum of embodiment one, it comprises fuel gas cylinder 1, oxygen gas cylinder 2, nitrogen gas cylinder 3, flowmeter 41, No. two flowmeters 42, No. three flowmeters 43, mixes gas tank 5, quartz glass pipe 6, laser instrument 71, condenser lens 81, No. two condenser lenses 82, optical fiber 91, a spectrometer 101 and a computing machine 111;
Charge into inflammable gas in the fuel gas cylinder 1, charge into oxygen in the oxygen gas cylinder 2, charge into nitrogen in the nitrogen gas cylinder 3; The gas outlet of the gas outlet of the gas outlet of said fuel gas cylinder 1, oxygen gas cylinder 2 and nitrogen gas cylinder 3 is communicated with three air intake openings of mixed gas tank 5 respectively; Flowmeter 41, No. two flowmeters 42 and No. three flowmeters 43 are separately positioned on the gas outlet of fuel gas cylinder 1, the gas outlet of oxygen gas cylinder 2 and the place, gas outlet of nitrogen gas cylinder 3; The gas outlet of mixing gas tank 5 is communicated with the terminal air intake opening of quartz glass pipe 6;
The laser beam that laser instrument 71 sends is incident to condenser lens 81 No. one, focuses to the mouth of pipe of quartz glass pipe 6 through condenser lens 81, is used to puncture the mixed gas that this mouth of pipe flows out, and produces plasma, and said gas ions is sent fluorescence signal; No. two condenser lenses 82 of fluorescence signal warp that said plasma sends focus to an end of an optical fiber 91, and the other end of an optical fiber 91 is connected with the light signal receiving end of a spectrometer 101; The spectral signal output terminal of a said spectrometer 101 is connected with the spectral signal input end of a computing machine 111.
Embodiment three, based on the method based on laser induced plasma spectral measurement inflammable gas and oxygenant equivalent proportion of embodiment one, it is realized by following steps:
Step 1, employing laser instrument send laser beam, and this laser beam is focused in the target combustion device, puncture inflammable gas to be measured and oxygenant in the target combustion device, produce plasma; Said plasma sends fluorescence signal;
H characteristic peak described in step 3, the obtaining step two in the plasma spectrometry of inflammable gas to be measured and oxygenant and O characteristic peak; Calculate said H characteristic peak and O characteristic peak intensity rate, and obtain the equivalent proportion of gas to be measured according to the linear relationship of spectral intensity ratio and equivalent proportion.
In the step 3: observe the plasma spectrometry of inflammable gas to be measured described in the step 2 and oxygenant, near the characteristic peak that 656.9nm, obviously exceeds is H
656nmSpectral line, near the characteristic peak that 777.9nm, obviously exceeds are O
777nmSpectral line; Read above-mentioned H
656nmAnd O
777nmArticle two, the spectral intensity of spectral line, and calculate said H
656nmAnd O
777nmArticle two, the intensity rate of spectral line; Obtain the equivalent proportion of gas to be measured according to the linear relationship of spectral intensity ratio and equivalent proportion.
Inflammable gas to be measured described in the step 1 is hydrocarbon fuel or hydrogen fuel.
The laser repetition rate of laser instrument output is 100Hz in the step 1, and the output laser center wavelength is 532nm; Laser energy is between 3mJ to 7mJ.
The response wave band of spectrometer is 200nm to 1000nm in the step 2, and the electrooptical device that uses in the said spectrometer is ICCD, and said ICCD adopts laser pulse to carry out the triggering collection signal, and its gate-width time is 10ns ~ 500ns.
ICCD (ICCD is enhancement mode CCD, is the electrooptical device in the used spectrometer) carries out the triggering collection signal by laser pulse, and the gate-width time is 10ns ~ 500ns.The setting of this gate-width can reach following effect: 1, the time-domain filtering denoising is effective; 2, guarantee enough hyperfluorescence signals; 3, guarantee real-time online property.
Embodiment four, the measurement inflammable gas of realizing embodiment three and the device of oxygenant equivalent proportion; It is characterized in that: it comprises No. two laser instruments 72, No. three condenser lenses 83, burner 12, No. four condenser lenses 84, No. two optical fiber 92, No. two spectrometers 102 and No. two computing machines 112, charges into inflammable gas to be measured and oxygenant in the burner 12;
The laser beam that No. two laser instruments 72 send is incident to condenser lens 83 No. three, focuses to burner 12 through No. three condenser lenses 83, and punctures inflammable gas to be measured and oxygenant in the burner 12, produces plasma; Said plasma sends fluorescence signal;
Fluorescence signal that said plasma sends focuses to an end of No. two optical fiber 92 through No. four condenser lenses 84, and the other end of No. two optical fiber 92 is connected with light signal receiving end to No. two spectrometers 102; The spectral signal output terminal of said No. two spectrometers 102 is connected with the spectral signal input end of No. two computing machines 102.
Principle: suppose I
aAnd I
bBe respectively the spectral line of emission intensity of a and two kinds of elements of b, according to Boltzmann's law, strength ratio I
a/ I
bCan obtain through following equation:
Wherein, distribution function U (T) is provided by following formula:
In the formula: g
iExpression degeneracy or energy level E
iStatistical weight, expression formula is:
g
i=2J
i+1 （3）
J
iIt is angular quantum number; T is the electron temperature of plasma.
The experimental results shows, adopts laser breakdown to induce the plasma of generation to satisfy two conditions: 1. local thermodynamic equilibrium; 2. plasma optically is thin.Can think that based on these two conditions formula (1) ionic medium body electron temperature T is constant for confirming.
Therefore, if we obtain the strength ratio I of spectrum line through experiment measuring
a/ I
b, just can obtain population density through top formula (1) and compare N
a/ N
b
In premixed flame, the concentration ratio of fuel and oxygenant is relevant with equivalent proportion.Equivalent proportion be meant in the burning mixture actual fuel and oxygenant fuel and the mass ratio of oxygenant of mass ratio during divided by perfect combustion.Expression formula is:
Wherein, the m representation quality, η represents molal weight.The footmark st in the denominator lower right corner representes the result that obtains with stoichiometrical method.
If under the situation that in combustion furnace, does not have the reactant diffusion or leak, equivalent proportion φ can represent with the atomic particle number density.Expression formula is following:
Formula (5) substitution formula (1) can be got:
Wherein:
Be a constant, in the standard spectrum tables of data, can find.
Therefore formula (5) can abbreviation be:
Wherein:
Be constant;
In theory, utilize formula (8), can obtain model as shown in Figure 3.
Therefore; As can be seen from Figure 3; In theory, there are certain linear in equivalent proportion Φ and spectral line strength ratio
.
The present invention utilizes this relation exactly, recently studies equivalent proportion through the intensity of spectral line.
Claims (10)
1. based on the calibrating method of laser induced plasma spectrum, it is characterized in that: it is realized by following steps:
Steps A, inflammable gas, oxygen and nitrogen fed mix gas tank, form mixed gas, and control the flow of said inflammable gas, oxygen and nitrogen respectively;
Step B, the mixed gas that forms in the steps A is fed the quartz glass pipe, and said mixed gas is flowed out from the mouth of pipe of quartz glass pipe;
Step C, employing laser instrument send laser beam, and said laser beam is focused on nozzle position described in the step B, puncture the mixed gas that the mouth of pipe flows out, and produce plasma, and said plasma sends fluorescence signal;
Step D, plasma described in the step C sent fluorescence signal adopt condenser lens to focus on the inlet of optical fiber, this optical fiber with the optical signal transmission of its inlet incident to spectrometer; The fluorescence signal that adopts the Computer Analysis spectrometer to gather obtains plasma spectrometry;
H characteristic peak described in step e, the obtaining step D in the plasma spectrometry and O characteristic peak, and calculate the intensity rate of said H characteristic peak and O characteristic peak;
Step F, the described inflammable gas of change steps A, oxygen and nitrogen flow and mixed gas equivalent proportion M time, repeated execution of steps A obtains the intensity rate of M H characteristic peak and O characteristic peak respectively to step e after each the change;
According to M+1 the H characteristic peak that obtains and the intensity rate acquisition spectral intensity ratio of O characteristic peak and the linear relationship of equivalent proportion, completion is based on the calibration of laser induced plasma spectrum; M is the integer greater than 2.
2. the calibrating method based on laser induced plasma spectrum according to claim 1 is characterized in that the laser of laser instrument output among the step C is that monopulse or repetition frequency are the multi-pulse laser of 1-1000Hz, and the output laser center wavelength is 532nm; Laser pulse width is 10ns; Laser energy is between 3mJ to 10mJ.
3. the calibrating method based on laser induced plasma spectrum according to claim 1, the response wave band that it is characterized in that spectrometer among the step D is 200nm to 1000nm; The electrooptical device that uses in the said spectrometer is ICCD, and said ICCD adopts laser pulse to carry out the triggering collection signal, and its gate-width time is 10ns ~ 500ns.
4. the calibrating method based on laser induced plasma spectrum according to claim 1 is characterized in that each scope that changes the mixed gas equivalent proportion is between 0.2 to 2.0 in the step F.
5. realize the robot scaling equipment based on laser induced plasma spectrum of claim 1, it is characterized in that: it comprises fuel gas cylinder (1), oxygen gas cylinder (2), nitrogen gas cylinder (3), a flowmeter (41), No. two flowmeters (42), No. three flowmeters (43), mixes gas tank (5), quartz glass pipe (6), a laser instrument (71), a condenser lens (81), No. two condenser lenses (82), an optical fiber (91), a spectrometer (101) and a computing machine (111);
The fuel gas cylinder charges into inflammable gas in (1), and the oxygen gas cylinder charges into oxygen in (2), and the nitrogen gas cylinder charges into nitrogen in (3); The gas outlet of the gas outlet of the gas outlet of said fuel gas cylinder (1), oxygen gas cylinder (2) and nitrogen gas cylinder (3) is communicated with three air intake openings of mixed gas tank (5) respectively; A flowmeter (41), No. two flowmeters (42) and No. three flowmeters (43) are separately positioned on the gas outlet of fuel gas cylinder (1), the gas outlet of oxygen gas cylinder (2) and the place, gas outlet of nitrogen gas cylinder (3); The gas outlet of mixing gas tank (5) is communicated with the terminal air intake opening of quartz glass pipe (6);
The laser beam that a laser instrument (71) sends is incident to a condenser lens (81); Focus to the mouth of pipe of quartz glass pipe (6) through a condenser lens (81); Be used to puncture the mixed gas that this mouth of pipe flows out, produce plasma, said gas ions is sent fluorescence signal;
Fluorescence signal No. two condenser lenses of warp (82) that said plasma sends focus to an end of an optical fiber (91), and the other end of an optical fiber (91) is connected with the light signal receiving end of a spectrometer (101); The spectral signal output terminal of a said spectrometer (101) is connected with the spectral signal input end of a computing machine (111).
6. based on the method for laser induced plasma spectral measurement inflammable gas and oxygenant equivalent proportion, it is characterized in that: it is realized by following steps:
Step 1, employing laser instrument send laser beam, and this laser beam is focused in the target combustion device, puncture inflammable gas to be measured and oxygenant in the target combustion device, produce plasma; Said plasma sends fluorescence signal;
Step 2, the plasma in the step 1 is sent fluorescence signal adopt condenser lens to focus in the optical fiber; And through Optical Fiber Transmission to spectrometer; Adopt the fluorescence signal of Computer Analysis spectrometer collection, obtain the plasma spectrometry of inflammable gas to be measured and oxygenant;
H characteristic peak described in step 3, the obtaining step two in the plasma spectrometry of inflammable gas to be measured and oxygenant and O characteristic peak; Calculate said H characteristic peak and O characteristic peak intensity rate, and obtain the equivalent proportion of gas to be measured according to the linear relationship of spectral intensity ratio and equivalent proportion.
7. the method based on laser induced plasma spectral measurement inflammable gas and oxygenant equivalent proportion according to claim 6 is characterized in that inflammable gas to be measured described in the step 1 is hydrocarbon fuel or hydrogen fuel.
8. the method based on laser induced plasma spectroscopy measurement air mixture equivalent proportion according to claim 6; The laser that it is characterized in that laser instrument output in the step 1 is that monopulse or repetition frequency are the multi-pulse laser of 1-1000Hz, and the output laser center wavelength is 532nm; Laser pulse width is 10ns; Laser energy is between 3mJ to 10mJ.
9. the method based on laser induced plasma spectroscopy measurement air mixture equivalent proportion according to claim 6; The response wave band that it is characterized in that spectrometer in the step 2 is 200nm to 1000nm; The electrooptical device that uses in the said spectrometer is ICCD; Said ICCD adopts laser pulse to carry out the triggering collection signal, and its gate-width time is 10ns ~ 500ns.
10. realize the measurement inflammable gas of claim 6 and the device of oxygenant equivalent proportion; It is characterized in that: it comprises No. two laser instruments (72), No. three condenser lenses (83), burner (12), No. four condenser lenses (84), No. two optical fiber (92), No. two spectrometers (102) and No. two computing machines (112), and burner charges into inflammable gas to be measured and oxygenant in (12);
The laser beam that No. two laser instruments (72) send is incident to No. three condenser lenses (83), focuses to burner (12) through No. three condenser lenses (83), and punctures inflammable gas to be measured and oxygenant in the burner (12), produces plasma; Said plasma sends fluorescence signal;
Fluorescence signal that said plasma sends focuses to an end of No. two optical fiber (92) through No. four condenser lenses (84), and the other end of No. two optical fiber (92) is connected with light signal receiving end to No. two spectrometers (102); The spectral signal output terminal of said No. two spectrometers (102) is connected with the spectral signal input end of No. two computing machines (102).
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103063640A (en) * | 2012-12-28 | 2013-04-24 | 西北核技术研究所 | Laser-induced fluorescence combustion field parameter measuring device |
| CN103257135A (en) * | 2013-03-11 | 2013-08-21 | 上海交通大学 | Multicomponent fuel spray concentration and evaporativity test method and its implementation device |
| CN103615720A (en) * | 2013-11-27 | 2014-03-05 | 广东电网公司电力科学研究院 | Method for screening equivalence ratios of combustion gas of foamed ceramic burner |
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| CN110082342A (en) * | 2019-02-26 | 2019-08-02 | 天津大学 | Utilize the method and apparatus of laser spectrum measurement Combustion Flow Field material composition concentration |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06308029A (en) * | 1993-04-26 | 1994-11-04 | Mitsubishi Heavy Ind Ltd | Method and apparatus for measuring gas component concentration |
| JPH10132741A (en) * | 1996-11-05 | 1998-05-22 | Mitsubishi Heavy Ind Ltd | Technique and apparatus for measurement of trace component by using laser |
| CN102287349A (en) * | 2011-06-03 | 2011-12-21 | 哈尔滨工业大学 | Method for raising stable combustion limit of gas hydrocarbon fuels by femtosecond laser induced plasmas and device realizing same |
-
2012
- 2012-06-25 CN CN2012102094466A patent/CN102706850A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06308029A (en) * | 1993-04-26 | 1994-11-04 | Mitsubishi Heavy Ind Ltd | Method and apparatus for measuring gas component concentration |
| JPH10132741A (en) * | 1996-11-05 | 1998-05-22 | Mitsubishi Heavy Ind Ltd | Technique and apparatus for measurement of trace component by using laser |
| CN102287349A (en) * | 2011-06-03 | 2011-12-21 | 哈尔滨工业大学 | Method for raising stable combustion limit of gas hydrocarbon fuels by femtosecond laser induced plasmas and device realizing same |
Non-Patent Citations (2)
| Title |
|---|
| P.STAVROPOULOS M ET AL: "Laser-induced breakdown spectroscopy as an analytical tool for equivalence ratio measurement in methane-air premixed flames", 《SPECTROCHMICA ACTA PART B》 * |
| TRAN X. PHUOC*: "Laser-induced spark for simultaneous ignition and fuel-to-air ratio measurement", 《OPTICS AND LASERS IN ENGINEERING》 * |
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