CN105784640A - Optical method for measuring component concentration distribution of mixed gas flow field - Google Patents
Optical method for measuring component concentration distribution of mixed gas flow field Download PDFInfo
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- CN105784640A CN105784640A CN201610310835.6A CN201610310835A CN105784640A CN 105784640 A CN105784640 A CN 105784640A CN 201610310835 A CN201610310835 A CN 201610310835A CN 105784640 A CN105784640 A CN 105784640A
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- concentration distribution
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- moire fringe
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- 230000003287 optical effect Effects 0.000 title claims abstract description 48
- 238000000034 method Methods 0.000 title abstract description 7
- 238000003384 imaging method Methods 0.000 claims description 11
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 239000007789 gas Substances 0.000 description 76
- 238000005259 measurement Methods 0.000 description 9
- 239000000523 sample Substances 0.000 description 7
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000004313 glare Effects 0.000 description 2
- 241000931526 Acer campestre Species 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000002372 labelling Methods 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 241000894007 species Species 0.000 description 1
- 238000003325 tomography Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/41—Refractivity; Phase-affecting properties, e.g. optical path length
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- Pathology (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
The invention provides an optical method for measuring component concentration distribution of a mixed gas flow field. The mixed gas flow field comprises a first known gas and a second known gas which are mutually mixed together. The optical method for measuring the component concentration distribution of the mixed gas flow field comprises the following steps of a, transmitting laser with single wavelength to the mixed gas flow field; b, in an optical module for forming moire fringes, using laser passed through the mixed gas flow field to form the moire fringes; c, calculating by using a reconstruction algorithm according to the moire fringes to obtain three-dimensional refractive index distribution of the mixed gas flow field; d, calculating according to the three-dimensional refractive index distribution to obtain three-dimensional concentration distribution of the first known gas and the second known gas. The optical method provided by the invention has the beneficial effect that according to the optical method for measuring the component concentration distribution of the mixed gas flow field, the component concentration distribution of the mixed gas flow field with double components is obtained in a real-time, stable and non-contact way.
Description
Technical field
The invention belongs to optical detector technology field, more particularly to a kind of optical means measuring mixing gas group of flow fields point CONCENTRATION DISTRIBUTION.
Background technology
At present, mixing gas flowfield concentration of component distribution measurement, a lot of fields are all seemed particularly basis and crucial.But, this problem is not yet well solved so far.
Therefore, it is necessary to provide one to have the features such as real-time, stable, noncontact, it is possible to provide the optical means of the concentration of component distribution measuring mixing gas flowfield of 3-D CONCENTRATION DISTRIBUTION.
Summary of the invention
It is an object of the invention to provide one and there is the features such as real-time, stable, noncontact, it is possible to provide the optical means of the concentration of component distribution measuring mixing gas flowfield of 3-D CONCENTRATION DISTRIBUTION.
Technical scheme is as follows: the optical means of a kind of concentration of component distribution measuring mixing gas flowfield, described mixing gas flowfield includes being mutually mixed the first known gas together and the second known gas, and the optical means of the described concentration of component distribution measuring mixing gas flowfield comprises the steps: a, launches the laser of Single wavelength to described mixing gas flowfield；B, being used for being formed in the optical module of Moire fringe, utilize and form Moire fringe by the laser after described mixing gas flowfield；C, utilize algorithm for reconstructing to calculate according to described Moire fringe to obtain the three-dimensional index distribution of described mixing gas flowfield；D, calculate according to described three-dimensional index distribution and obtain described first known gas and the three-dimensional CONCENTRATION DISTRIBUTION of described second known gas.
Preferably, step c comprises the steps:
Adopt imageing sensor to gather described Moire fringe, and described Moire fringe is sent to computer；
Described computer is utilized to calculate the three-dimensional index distribution of described mixing gas flowfield according to algorithm for reconstructing.
Preferably, in step d, calculate the CONCENTRATION DISTRIBUTION of described first known gas according to equation below:
Wherein, μ is the CONCENTRATION DISTRIBUTION of the first known gas, ntIt is the refractive index measuring the described mixing gas flowfield obtained, n1And n2It is described first known gas and the refractive index of described second known gas respectively.
Preferably, the CONCENTRATION DISTRIBUTION of described second known gas is 1-μ.
Preferably, in step d, in described optical module, described laser sequentially passes through grating assembly, imaging lens arrangement and Moire fringe receiving screen, thus forming described Moire fringe on described Moire fringe receiving screen.
Preferably, described imaging lens arrangement includes the first lens and the second lens that relative spacing is arranged, and is additionally provided with wave filter between described first lens and described second lens, and described wave filter is arranged with optical axis with described first lens and described second lens.
The beneficial effects of the present invention is: the described optical means measuring mixing gas group of flow fields point CONCENTRATION DISTRIBUTION can in real time, stable, obtain the concentration of component with bi-component mixing gas flowfield non-contactly and be distributed；And, the experimental provision that the described optical means measuring mixing gas group of flow fields point CONCENTRATION DISTRIBUTION adopts is simple, simple operation, is suitable for the detection of the mixing gas flowfield concentration of certain scale.
Accompanying drawing explanation
The Fig. 1 structural representation measuring the measurement apparatus that mixing gas group of flow fields divides the optical means of CONCENTRATION DISTRIBUTION relevant for providing to the embodiment of the present invention；
Fig. 2 measures, for what embodiments of the invention provided, the FB(flow block) that mixing gas group of flow fields divides the optical means of CONCENTRATION DISTRIBUTION.
Detailed description of the invention
In order to make the purpose of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein is only in order to explain the present invention, is not intended to limit the present invention.
The description of specific distinct unless the context otherwise, element in the present invention and assembly, the form that quantity both can be single exists, it is also possible to multiple forms exists, and this is not defined by the present invention.Although the step in the present invention has arranged with label, but being not used to limit the precedence of step, the order of step or the execution of certain step need based on other steps unless expressly stated, and otherwise the relative rank of step is adjustable in.It is appreciated that term "and/or" used herein relates to and contain the one or more of any and all possible combination in the Listed Items being associated.
Please refer to the structural representation measuring the measurement apparatus that mixing gas group of flow fields divides the optical means of CONCENTRATION DISTRIBUTION relevant for providing to the embodiment of the present invention of Fig. 1 and Fig. 2, Fig. 1；Fig. 2 measures, for what embodiments of the invention provided, the FB(flow block) that mixing gas group of flow fields divides the optical means of CONCENTRATION DISTRIBUTION.
Described measurement apparatus 100 includes along the probe source 10 of optical axis successively linear array, beam-expanding collimation device 20, mixes gas flowfield 30, optical module 40 and the imageing sensor 50 being connected with compunication.Wherein, described mixing gas flowfield 30 is to include being mutually mixed the first known gas together and the second known gas, for instance the mixing gas flowfield being made up of oxygen and argon.And, in the work process of described measurement apparatus 100, the light beam that described probe source 10 provides passes sequentially through described beam-expanding collimation device 20, described mixing gas flowfield 30 and described optical module 40.
Described probe source 10 provides the laser of Single wavelength for described measurement apparatus 100.Preferably, described probe source 10 is the laser acquisition light source launching Single wavelength laser.Selectively, the optical maser wavelength that described probe source 10 provides can be adjusted according to gaseous species to be measured difference, and this is not limited by the present invention.
Described beam-expanding collimation device 20 can provide the light beam of the circular light spot that the depth of parallelism is higher over long distances, and make spot size keep being basically unchanged when distance changes.In the present embodiment, described beam-expanding collimation device 20 is adjusted for the laser that described probe source 10 is provided, and the laser ensured in described mixing gas flowfield 30 has the high depth of parallelism and the feature of low divergence.
Described optical module 40 can utilize the laser after by described mixing gas flowfield 30 to generate Moire fringe.In the present embodiment, described optical module 40 includes along the grating assembly 41 of described optical axis successively linear array, imaging lens arrangement 42 and Moire fringe receiving screen 43.Wherein, described grating assembly 41 includes the first grating 411 and the second grating 412 that relative spacing is arranged, and described imaging lens arrangement 42 includes the first imaging len 421 and the second imaging len 422 that relative spacing is arranged.Preferably, in order to obtain the clear distribution of Moire fringe accurately, described optical module 40 is typical 4-f system.
And, in described optical module 40, in order to remove the veiling glare impact on Moire fringe, being additionally provided with the wave filter 44 for eliminating veiling glare between described first imaging len 421 and the second imaging len 422, described wave filter 44 is arranged with optical axis with described first lens 421 and described second lens 422.
The Moire fringe receiving screen 43 of the corresponding described optical module 40 of described imageing sensor 50 is arranged, for recording the Moire fringe that described Moire fringe receiving screen 43 surface is formed.In the present embodiment, described imageing sensor 50 is ccd image sensor.
And, the described Moire fringe collected also is sent to computer by described imageing sensor 50, and is obtained the three-dimensional index distribution of described mixing gas flowfield 30 according to the algorithm set by described computer.
It should be noted that for the mixing gas flowfield with bi-component, the relation between its refractive index and CONCENTRATION DISTRIBUTION is as follows:
Remember that the refractive index of measured mixing gas flowfield 30 is designated as nt, remember the first known gas of described mixing gas flowfield 30 and the refractive index respectively n of the second known gas1And n2.The concentration assuming described first known gas is μ, then described second known gas concentration is (1-μ).Therefore, it can to have:
nt-1=μ (n1-1)+(1-μ)(n2-1)
=μ n1-μ+(1-μ)n2-(1-μ)
=μ n1-μ+n2-μn2-1+μ
=μ n1+n2-μn2-1
=μ (n1-n2)+n2-1
Based on above-mentioned formula, as long as experiment records the three-dimensional index distribution n of described mixing gas flowfield 30t, then the CONCENTRATION DISTRIBUTION of described first known gas and described second known gas can be obtained in that
The CONCENTRATION DISTRIBUTION of described first known gas:
The CONCENTRATION DISTRIBUTION of described second known gas: 1-μ.
Further, the mixing gas group of flow fields of measuring based on described measurement apparatus 100 that the embodiment of the present invention provides divides the optical means 200 of CONCENTRATION DISTRIBUTION, and it comprises the steps:
Step S1, to described mixing gas flowfield launch Single wavelength laser.
Specifically, by described probe source 10 to the laser launching Single wavelength in described mixing gas flowfield 30.And, described laser enters in described mixing gas flowfield 30 after the collimation adjustment of described beam-expanding collimation device 20.
Step S2, being used for being formed in the optical module of Moire fringe, utilize and form Moire fringe by the laser after described mixing gas flowfield.
Specifically, described laser is directly entered in described optical module 40 after described mixing gas flowfield 30.And, in described optical module 40, described laser sequentially passes through grating assembly 41, imaging lens arrangement 42 and Moire fringe receiving screen 43, thus forming described Moire fringe on described Moire fringe receiving screen 43.
Step S3, utilize algorithm for reconstructing to calculate according to described Moire fringe to obtain the three-dimensional index distribution of described mixing gas flowfield.
Specifically, described step S3 comprises the steps:
Adopt imageing sensor 50 to gather described Moire fringe, and described Moire fringe is sent to computer；
Described computer is utilized to calculate the three-dimensional index distribution of described mixing gas flowfield according to algorithm for reconstructing.
It should be noted that when described Moire fringe is sent to described computer by described imageing sensor 50, described computer utilizes More's deflection tomography technique construction algorithm for reconstructing, and calculates the three-dimensional index distribution obtaining described mixing gas flowfield 30.
Step S4, calculate according to described three-dimensional index distribution and obtain described first known gas and the three-dimensional CONCENTRATION DISTRIBUTION of described second known gas.
Specifically, in described step S4, calculate the CONCENTRATION DISTRIBUTION of described first known gas according to equation below:
Wherein, μ is the CONCENTRATION DISTRIBUTION of the first known gas, ntIt is the refractive index measuring the described mixing gas flowfield obtained, n1And n2It is described first known gas and the refractive index of described second known gas respectively.
Further, the CONCENTRATION DISTRIBUTION of described second known gas is 1-μ.
That is, three-dimensional index distribution according to the described mixing gas flowfield 30 obtained in step S2, described first known gas and the three-dimensional CONCENTRATION DISTRIBUTION of described second known gas can be obtained by step by step calculation, thus realizing the measurement operation of described mixing gas flowfield 30 concentration of component distribution.
Compared to prior art, the optical means of measurement mixing gas group of flow fields point CONCENTRATION DISTRIBUTION provided by the invention can obtain the concentration of component distribution with bi-component mixing gas flowfield in real time, stably, non-contactly；And, the experimental provision that the described optical means measuring mixing gas group of flow fields point CONCENTRATION DISTRIBUTION adopts is simple, simple operation, is suitable for the detection of the mixing gas flowfield concentration of certain scale.
It is obvious to a person skilled in the art that the invention is not restricted to the details of above-mentioned one exemplary embodiment, and when without departing substantially from the spirit of the present invention or basic feature, it is possible to realize the present invention in other specific forms.Therefore, no matter from which point, embodiment all should be regarded as exemplary, and be nonrestrictive, the scope of the invention rather than described above limits, it is intended that all changes in the implication of the equivalency dropping on claim and scope included in the present invention.Any accompanying drawing labelling in claim should be considered as the claim that restriction is involved.
In addition, it is to be understood that, although this specification is been described by according to embodiment, but not each embodiment only comprises an independent technical scheme, this narrating mode of description is only for clarity sake, description should be made as a whole by those skilled in the art, and the technical scheme in each embodiment through appropriately combined, can also form other embodiments that it will be appreciated by those skilled in the art that.
Claims (6)
1. measuring an optical means for mixing gas group of flow fields point CONCENTRATION DISTRIBUTION, described mixing gas flowfield includes being mutually mixed the first known gas together and the second known gas, it is characterised in that comprise the steps:
A, to described mixing gas flowfield launch Single wavelength laser；
B, being used for being formed in the optical module of Moire fringe, utilize and form Moire fringe by the laser after described mixing gas flowfield；
C, utilize algorithm for reconstructing to calculate according to described Moire fringe to obtain the three-dimensional index distribution of described mixing gas flowfield；
D, calculate according to described three-dimensional index distribution and obtain described first known gas and the three-dimensional CONCENTRATION DISTRIBUTION of described second known gas.
2. mixing gas group of flow fields of measuring according to claim 1 divides the optical means of CONCENTRATION DISTRIBUTION, it is characterised in that: step c comprises the steps:
Adopt imageing sensor to gather described Moire fringe, and described Moire fringe is sent to computer；
Described computer is utilized to calculate the three-dimensional index distribution of described mixing gas flowfield according to algorithm for reconstructing.
3. mixing gas group of flow fields of measuring according to claim 1 divides the optical means of CONCENTRATION DISTRIBUTION, it is characterised in that: in step d, calculate the CONCENTRATION DISTRIBUTION of described first known gas according to equation below:
Wherein, μ is the CONCENTRATION DISTRIBUTION of the first known gas, ntIt is the refractive index measuring the described mixing gas flowfield obtained, n1And n2It is described first known gas and the refractive index of described second known gas respectively.
4. mixing gas group of flow fields of measuring according to claim 3 divides the optical means of CONCENTRATION DISTRIBUTION, it is characterised in that: the CONCENTRATION DISTRIBUTION of described second known gas is 1-μ.
5. mixing gas group of flow fields of measuring according to claim 1 divides the optical means of CONCENTRATION DISTRIBUTION, it is characterized in that: in step d, in described optical module, described laser sequentially passes through grating assembly, imaging lens arrangement and Moire fringe receiving screen, thus forming described Moire fringe on described Moire fringe receiving screen.
6. mixing gas group of flow fields of measuring according to claim 5 divides the optical means of CONCENTRATION DISTRIBUTION, it is characterized in that: described imaging lens arrangement includes the first lens and the second lens that relative spacing is arranged, and between described first lens and described second lens, it being additionally provided with wave filter, described wave filter is arranged with optical axis with described first lens and described second lens.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108152222A (en) * | 2017-10-31 | 2018-06-12 | 北京农业智能装备技术研究中心 | A kind of gas concentration field measurement method and apparatus |
| CN109883992A (en) * | 2019-01-02 | 2019-06-14 | 西安电子科技大学 | A kind of method for transformation of emulation flow field image RGB and refractive index field distribution |
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| CN108152222A (en) * | 2017-10-31 | 2018-06-12 | 北京农业智能装备技术研究中心 | A kind of gas concentration field measurement method and apparatus |
| CN109883992A (en) * | 2019-01-02 | 2019-06-14 | 西安电子科技大学 | A kind of method for transformation of emulation flow field image RGB and refractive index field distribution |
| CN109883992B (en) * | 2019-01-02 | 2021-06-25 | 西安电子科技大学 | Conversion method for simulating flow field image RGB and refractive index field distribution |
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