CN110082342A - Utilize the method and apparatus of laser spectrum measurement Combustion Flow Field material composition concentration - Google Patents
Utilize the method and apparatus of laser spectrum measurement Combustion Flow Field material composition concentration Download PDFInfo
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- 238000002485 combustion reaction Methods 0.000 title claims abstract description 46
- 238000001228 spectrum Methods 0.000 title claims abstract description 44
- 238000005259 measurement Methods 0.000 title claims abstract description 43
- 238000000034 method Methods 0.000 title claims abstract description 35
- 239000000203 mixture Substances 0.000 title claims abstract description 15
- 239000000463 material Substances 0.000 title claims abstract description 13
- 230000003595 spectral effect Effects 0.000 claims abstract description 21
- 230000003993 interaction Effects 0.000 claims abstract description 15
- 238000011088 calibration curve Methods 0.000 claims abstract description 13
- 238000009826 distribution Methods 0.000 claims abstract description 10
- 230000000694 effects Effects 0.000 claims abstract description 9
- 238000012545 processing Methods 0.000 claims description 9
- 238000010223 real-time analysis Methods 0.000 claims description 7
- 238000002347 injection Methods 0.000 claims description 4
- 239000007924 injection Substances 0.000 claims description 4
- 239000000470 constituent Substances 0.000 claims description 2
- 238000000295 emission spectrum Methods 0.000 claims 1
- 101000694017 Homo sapiens Sodium channel protein type 5 subunit alpha Proteins 0.000 abstract 1
- 238000005516 engineering process Methods 0.000 description 9
- 230000003287 optical effect Effects 0.000 description 8
- 238000002536 laser-induced breakdown spectroscopy Methods 0.000 description 6
- 239000000446 fuel Substances 0.000 description 5
- 239000000126 substance Substances 0.000 description 5
- 238000000041 tunable diode laser absorption spectroscopy Methods 0.000 description 5
- 238000004458 analytical method Methods 0.000 description 4
- 238000001069 Raman spectroscopy Methods 0.000 description 3
- 230000015556 catabolic process Effects 0.000 description 3
- 230000000875 corresponding effect Effects 0.000 description 3
- 238000000691 measurement method Methods 0.000 description 3
- 239000007800 oxidant agent Substances 0.000 description 3
- 230000001590 oxidative effect Effects 0.000 description 3
- 230000035945 sensitivity Effects 0.000 description 3
- 238000004611 spectroscopical analysis Methods 0.000 description 3
- 238000000862 absorption spectrum Methods 0.000 description 2
- 238000003384 imaging method Methods 0.000 description 2
- 239000004615 ingredient Substances 0.000 description 2
- 238000001499 laser induced fluorescence spectroscopy Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 230000005461 Bremsstrahlung Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000002596 correlated effect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000003745 diagnosis Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000010494 dissociation reaction Methods 0.000 description 1
- 230000005593 dissociations Effects 0.000 description 1
- 238000004993 emission spectroscopy Methods 0.000 description 1
- 238000000911 femtosecond laser-induced breakdown spectroscopy Methods 0.000 description 1
- 238000001506 fluorescence spectroscopy Methods 0.000 description 1
- 239000008246 gaseous mixture Substances 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 230000001869 rapid Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000000790 scattering method Methods 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
- 230000005472 transition radiation Effects 0.000 description 1
- 238000012800 visualization Methods 0.000 description 1
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- 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
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Abstract
The present invention relates to Combustion Flow Field material composition measurement of concetrations, to realize that multicomponent, in real time, online, accurately one-dimensional concentration of component precise measurement, spatial resolution are good；Measurement range is wide.Thus, the method and apparatus that the present invention measures Combustion Flow Field material composition concentration using laser spectrum, utilize femtosecond laser self-focusing Filament effect, silk is introduced to the Combustion Flow Field of known concentration of component, and with molecule, atomic interaction in flow field and the spectral line of emission, optic spectrum line is divided via the ICCD cameras record with image intensifying function by spectrometer and is transferred to computer, is obtained the relationship between concentration of component information and equivalent proportion and optic spectrum line intensity rate, is obtained calibration curve；Plasma filament is introduced into Combustion Flow Field to be measured later, and with molecule, atomic interaction in flow field and the spectral line of emission, compareed to obtain the one-dimensional concentration distribution of Combustion Flow Field and equivalent proportion information with calibration curve.Present invention is mainly applied to Combustion Flow Field material composition measurement of concetrations.
Description
Technical field
The present invention relates to Combustion Flow Field material composition measurement of concetration technologies, and in particular to utilizes laser spectrum measurement burning stream
The method of field material composition concentration.
Background technique
The component of substance and corresponding concentration of component are the Important Parameters for studying flow field movement among flow field.For burning
Flow field, concentration of component and the fuel to air equivalence ratio of combustion process are (when the mass ratio of actual fuel and oxidant is divided by completely burned
The mass ratio of fuel and oxidant) be Important Parameters in mixed gas system, real-time and accurately obtain concentration of component and
Equivalent proportion has great importance for premix, diffusion, igniting and the simulation analysis etc. of studying air mixture.Currently, for
The concentration of component of flow field substance and the measurement of equivalent proportion mainly have non-optical means and optical instrument.
Non-optical measurement means include the gas componant of direct measurement fuel, the ratio of oxidant and measurement tail gas.It adopts
When with direct measurement means, bigger error will cause in the case where the consumption of fuel is not very big.And tail gas is used to survey
Amount means, need to increase some additional device such as gas sensors and analyzer, and price is more expensive.And the above method is not
It can measure to obtain the concentration information of flow field different location in real time.Laser-diagnose technology as a kind of non-intervention type optical instrument,
With possess the advantages such as noiseless, high-resolution, high-precision, visualization, have become research Combustion Flow Field component distribution and it is dense
One of the important means of degree.
The concentration of component and equivalent proportion main method of optical instrument measurement Combustion Flow Field have Raman scattering [1] etc., and laser lures
Lead fluorescence [2] (Laser Induced Fluorescence, LIF), tunable diode laser absorption spectroscopy [3]
(Tunable Diode Laser Absorption Spectroscopy, TDLAS), laser induced breakdown spectroscopy [4]
(Laser-Induced Breakdown Spectroscopy, LIBS).When measuring concentration using Raman scattering method, signal-to-noise ratio is not
Be it is very high, sensitivity is poor, to realize that preferable measurement effect needs laser to provide higher power.Using induced with laser
When fluorescence spectroscopy technique measurement burning field concentration, and incident laser energy decaying can be encountered and the problems such as fluorescent quenching to quantitatively calibrating
It impacts, and has strict requirements to laser output wavelength.It is surveyed using tunable diode laser absorption spectroscopy
There are two types of methods when amount: direct absorption spectrum measuring method and Wavelength modulation spectroscopy measurement method.Direct absorption spectrum measurement side
Method noise is smaller, is affected by system noise and external factor, gas pressure intensity is higher or the trap of gas compared with
Hour, it cannot achieve the accurate adjustment of reference signal, biggish measurement error can be caused；Wavelength modulation spectroscopy measurement method needs
Complicated calibration process, and many parameters are relied on, parameter can have an impact the accuracy of calibration.
Laser induced breakdown spectroscopy (LIBS) is a kind of atomic spectroscopic analysis technology.It utilizes high intensity pulses laser
It focuses and generates transient state plasma, pass through the position and signal strength of atom and ion emission spectroscopy spectral line in analysis plasma
To obtain the ingredient and concentration information of substance.This method experimental system is simple, and analysis speed is fast, high sensitivity, to laser
It is required that it is relatively low, multicomponent, precise measurement in real time, online, in situ may be implemented.But conventional laser induced breakdown spectroscopy
Technology uses nanosecond laser, and nanosecond laser will form a point after condenser lens focuses, therefore, nanosecond laser induction
Breakdown spectral technology can only realize that zero dimension point measures, and spatial resolution is not high when this method measures, and while measuring has laser
The interference of bremsstrahlung.
[1] Liu Jiansheng, Liu Jingru measure the concentration of component and temperature [J] Acta Optica of combustion field using Raman scattering,
2000, 20(9):1263-1267.
[2] yuxin, Peng Jiangbo, Yang Zhen, Li Xiaohui, Fan Rongwei, Lu Wei, Chen Deying, Li Xudong, Dong Zhiwei, Zhang Yali, merchant
Rich sun obtains the black dragon of method [P] of OH concentration space distribution based on planar laser-induced fluorescence imaging device and using the device
River: CN103344619A, 2013-10-09.
[3] online multicomponent gas concentration detection system [J] instrumental technique of Sun Lingfang, the Yu Hong based on TDLAS technology
With sensor, 2017 (03): 73-77.
[4]Kiefer J,Li Z,Alden M.Laser-induced breakdown spectroscopy in a
partially premixed turbulent jet flame[J].Measurement Science and Technology,
2013,24(7):075205。
Summary of the invention
In order to overcome the deficiencies of the prior art, the present invention is directed to propose the method for measurement Combustion Flow Field material composition concentration, is surveyed
Signal strength is high when amount, and noise jamming is smaller, there is preferable signal-to-noise ratio；The present invention may be implemented multicomponent, in real time, it is online,
Accurate one-dimensional concentration of component precise measurement, there is good spatial resolution；In addition, present invention can apply to laminar flows and rapids
One-dimensional concentration of component measurement is carried out in stream, measurement range is wide.For this reason, the technical scheme adopted by the present invention is that utilizing laser spectrum
It is dense to be introduced main constituent using femtosecond laser self-focusing Filament effect by the method for measuring Combustion Flow Field material composition concentration for silk
The Combustion Flow Field of degree, and with molecule, atomic interaction in flow field and the spectral line of emission, optic spectrum line by spectrometer light splitting via
ICCD (Intensified Charge-Coupled Detector and Charge-Injection with image intensifying function
Detector) cameras record and it is transferred to computer, real-time analysis processing is carried out to data by computer, obtains concentration of component letter
Breath and the relationship between equivalent proportion and optic spectrum line intensity rate, obtain calibration curve, as calibration process；It is later to measure
Plasma filament is introduced Combustion Flow Field to be measured by journey, and simultaneously the spectral line of emission, spectrum are composed with molecule, atomic interaction in flow field
Line information is divided via ICCD cameras record by spectrometer and is transferred to computer, is analyzed in real time by computer data
Processing, obtains optic spectrum line intensity rate and is compareed to obtain the one-dimensional concentration distribution of Combustion Flow Field and equivalent with calibration curve
Compare information.
Utilize the device of laser spectrum measurement Combustion Flow Field material composition concentration, femto-second laser, spectrometer, ICCD camera
It is formed with computer；Femto-second laser generates laser and has self-focusing Filament effect, and silk is introduced to the burning stream of known concentration of component
, and simultaneously the spectral line of emission, optic spectrum line are divided by spectrometer via with image intensifying with molecule, atomic interaction in flow field
ICCD (the Intensified Charge-Coupled Detector and Charge-Injection of function
Detector) cameras record and it is transferred to computer, real-time analysis processing is carried out to data by computer, obtains concentration of component letter
Breath and the relationship between equivalent proportion and optic spectrum line intensity rate, obtain calibration curve, as calibration process；It is later to measure
Plasma filament is introduced Combustion Flow Field to be measured by journey, and simultaneously the spectral line of emission, spectrum are composed with molecule, atomic interaction in flow field
Line information is divided via ICCD cameras record by spectrometer and is transferred to computer, is analyzed in real time by computer data
Processing, obtains optic spectrum line intensity rate and is compareed to obtain the one-dimensional concentration distribution of Combustion Flow Field and equivalent with calibration curve
Compare information.
The features of the present invention and beneficial effect are:
The present invention is the concentration of component and equivalent proportion realized using femtosecond laser breakdown spectral technology for Combustion Flow Field
Measurement, this method have a non-intruding, the features such as sensitivity is strong, relative to other optical method for measuring combustion components concentration distributions with
And equivalent proportion, the present invention is there are also spatial resolution height, the advantages that quantitatively calibrating process is simple, may be implemented multicomponent, in real time,
Line, accurate one-dimensional concentration of component precise measurement, and the present invention is also applied to the complex environments such as laminar flow and turbulent flow
Among measurement.
Detailed description of the invention:
Fig. 1 Combustion Flow Field apparatus for measuring concentration schematic diagram.
Show that this method measuring system is divided into 5 parts in figure, various pieces title and abbreviated functional description are as follows:
1 femto-second laser, the light source as measuring system；
2 computers, for storing and handling data；
The optical signal being collected into is divided by 3 spectrometers；
4ICCD camera captures luminous spectral signal, imaging；
5 flow fields to be measured.
Specific embodiment
It is specifically a kind of to be lured using femtosecond laser the present invention relates to laser spectrum tech field and combustion diagnosis field
Breakdown spectral technology is led, the one-dimensional concentration of component of Combustion Flow Field and equivalent proportion information are obtained.
The invention belongs to the optical means of Combustion Flow Field concentration of component measurement, and the present invention is to solve existing some substances
The optical means of measurement of concetration noise jamming in measurement is big, and spatial resolution is not high enough and puts forward.The present invention is measuring
When signal strength it is high, noise jamming is smaller, there is preferable signal-to-noise ratio；Multicomponent, real-time, online, essence may be implemented in the present invention
True one-dimensional concentration of component precise measurement, there is good spatial resolution；In addition, present invention can apply to laminar flows and turbulent flow
Middle to carry out one-dimensional concentration of component measurement, measurement range is wide.
The present invention mainly utilizes femtosecond laser induced breakdown spectroscopy to realize Combustion Flow Field concentration of component and equivalent proportion
Measurement.Femtosecond laser is focused by condenser lens forms a plasma lines later, among the plasma and flow field
Molecule, atom have an effect and emit optic spectrum line, the position of optic spectrum line and signal strength be able to reflect substance ingredient and
Concentration information can be obtained by the concentration of component and equivalent proportion information in flow field using the information that spectrometer records the spectral line of emission.
The measurement of the one-dimensional concentration information of stream field may be implemented in this method, has good spatial resolution and signal-to-noise ratio, and can
To be applied among the measurement of laminar flow and field of turbulent flow.
The present invention focuses the hair that material effect generates in the plasma to be formed and Combustion Flow Field by recording femtosecond laser
Position and the strength information of spectrum are penetrated, to obtain the concentration information of flow field component.
Measuring device of the invention is made of femto-second laser, spectrometer, ICCD camera and computer.
Measurement method of the invention is carried out by following step: femtosecond laser has self-focusing Filament effect, and silk is introduced
The Combustion Flow Field of known concentration of component, and simultaneously the spectral line of emission, optic spectrum line pass through spectrum with molecule, atomic interaction in flow field
Instrument light splitting is via ICCD cameras record and is transferred to computer, carries out real-time analysis processing to data by computer, obtains component
Relationship between concentration information and equivalent proportion and optic spectrum line intensity rate obtains calibration curve, as calibration process.It is later
Plasma filament is introduced Combustion Flow Field to be measured by measurement process, and with molecule, atomic interaction in flow field and the spectral line of emission,
Optic spectrum line information is divided via ICCD cameras record by spectrometer and is transferred to computer, is carried out by computer to data real
When analysis handle, obtain optic spectrum line intensity rate and compareed to obtain the one-dimensional concentration distribution of Combustion Flow Field with calibration curve
With equivalent proportion information.
Working principle: the chevilled silk that femtosecond laser self-focusing is formed is introduced into Combustion Flow Field to be measured.Laser focuses generation
Plasma with mix atmosphere interaction and issue the optic spectrum line signal containing molecular atoms and ion information.The signal produces
Raw principle is that the plasma that focuses of femtosecond laser by the molecular dissociation in gaseous mixture and can be energized into upper energy level, part later
Atom be combined with each other and the downward transition radiation of the particle of upper energy level goes out the optic spectrum line of specific wavelength, optic spectrum line intensity with it is corresponding
The quantity of particle is positively correlated, thus the concentration of the available corresponding component of ratio using the intensity of spectral line.It will using spectrometer
Obtained scattered light signal is divided and uses the position of the spectral line of spectrum and strength information under ICCD cameras record, and the number that will be obtained
According to being transferred in computer, spectrum is analyzed and processed using the MATLAB software programming program in computer, can be obtained in real time
Obtain the concentration of component and equivalent proportion of Combustion Flow Field.
It is illustrated with reference to Fig. 1 a specific embodiment of the invention method.
Calibration process first: femto-second laser 1 generate laser by self-focusing at silk to flow field 5 to be measured among；And
Scattered light signal is issued with the mixing atmosphere interaction in the Combustion Flow Field of known concentration of component, scattered light signal passes through spectrometer
Position and strength information after 3 light splitting by 4 spectra re-recorded spectral line of ICCD camera, and enter data into computer 2, it calculates
Machine 2 passes through the data analysis program editted and is analyzed and processed to signal collected, obtains Combustion Flow Field concentration of component
And the relationship between equivalent proportion and optic spectrum line intensity rate, obtain calibration curve.
Measurement process later: femto-second laser 1 generate laser by self-focusing at silk to flow field 5 to be measured among；And
Scattered light signal is issued with the mixing atmosphere interaction in Combustion Flow Field to be measured, after scattered light signal is divided by spectrometer 3
Position and strength information by 4 spectra re-recorded spectral line of ICCD camera, and enter data into computer 2, computer 2 passes through
The data analysis program editted is analyzed and processed signal collected, obtains the ratio of optic spectrum line intensity, by this
Ratio is compareed with calibration curve can be obtained by Combustion Flow Field one-dimensional concentration of component distribution and equivalent proportion information.
Claims (2)
1. a kind of method using laser spectrum measurement Combustion Flow Field material composition concentration, characterized in that certainly using femtosecond laser
Focus Filament effect, silk introduce to the Combustion Flow Field of known concentration of component, and with molecule, atomic interaction in flow field and emit
Spectral line, optic spectrum line are divided by spectrometer via ICCD (the Intensified Charge- for having image intensifying function
Coupled Detector and Charge-Injection Detector) cameras record and it is transferred to computer, by calculating
Machine carries out real-time analysis processing to data, obtains the pass between concentration of component information and equivalent proportion and optic spectrum line intensity rate
System, obtains calibration curve, as calibration process；Later it is measurement process, plasma filament is introduced into Combustion Flow Field to be measured, and with
Molecule, atomic interaction and the spectral line of emission in flow field, optic spectrum line information are divided by spectrometer via ICCD cameras record
And it is transferred to computer, real-time analysis processing is carried out to data by computer, obtains optic spectrum line intensity rate and bent with calibration
Line is compareed to obtain the one-dimensional concentration distribution of Combustion Flow Field and equivalent proportion information.
2. a kind of device using laser spectrum measurement Combustion Flow Field material composition concentration, characterized in that by femto-second laser, light
Spectrometer, ICCD camera and computer composition；Femto-second laser generates laser and has self-focusing Filament effect, and silk is introduced main constituent
The Combustion Flow Field of concentration, and simultaneously the spectral line of emission, optic spectrum line pass through spectrometer and are divided warp with molecule, atomic interaction in flow field
By ICCD (the Intensified Charge-Coupled Detector and Charge- for having image intensifying function
Injection Detector) cameras record and it is transferred to computer, real-time analysis processing is carried out to data by computer, is obtained
Relationship between concentration of component information and equivalent proportion and optic spectrum line intensity rate obtains calibration curve, as calibration process；It
Afterwards be measurement process, plasma filament introduced into Combustion Flow Field to be measured, and with molecule, atomic interaction in flow field and emission spectra
Line, optic spectrum line information are divided by spectrometer and via ICCD cameras record and are transferred to computer, by computer to data into
The real-time analysis processing of row, obtains optic spectrum line intensity rate and is compareed to obtain the one-dimensional concentration of Combustion Flow Field with calibration curve
Distribution and equivalent proportion information.
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Cited By (2)
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| CN112945935A (en) * | 2021-01-14 | 2021-06-11 | 西安交通大学 | Spray local equivalence ratio measuring system and method based on laser-induced breakdown spectroscopy |
| CN113533290A (en) * | 2021-08-18 | 2021-10-22 | 中国空气动力研究与发展中心超高速空气动力研究所 | High-enthalpy flow field atomic concentration calibration system and method |
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| CN113533290A (en) * | 2021-08-18 | 2021-10-22 | 中国空气动力研究与发展中心超高速空气动力研究所 | High-enthalpy flow field atomic concentration calibration system and method |
| CN113533290B (en) * | 2021-08-18 | 2023-03-21 | 中国空气动力研究与发展中心超高速空气动力研究所 | High-enthalpy flow field atomic concentration calibration system and method |
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| CN110082342B (en) | 2021-12-07 |
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