CN204789239U - Angle of scattering is from maring whole audience rainbow measuring device based on dual wavelength - Google Patents
Angle of scattering is from maring whole audience rainbow measuring device based on dual wavelength Download PDFInfo
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- CN204789239U CN204789239U CN201520498415.6U CN201520498415U CN204789239U CN 204789239 U CN204789239 U CN 204789239U CN 201520498415 U CN201520498415 U CN 201520498415U CN 204789239 U CN204789239 U CN 204789239U
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Abstract
The utility model relates to a two -phase flow measures the field, aims at providing an angle of scattering is from maring whole audience rainbow measuring device based on dual wavelength. This measuring device is including spraying generation unit, laser emission unit, signal collector unit and signal processing unit four bibliographic categories branch, wherein the laser emission unit comprises at the beam splitter and the reflector platform system of swing offset bench different semiconductor laser, modulation element, the dresses of two wavelength, the signal collector unit is: the fourier imaging system who constitutes by visual field lens, aperture diaphragm and imaging lens to and colored CCD chip. The utility model has the characteristics of the structure is succinct, easy and simple to handle, exempt from extra high precision measurement instrument, be fit for extending that one -dimensional rainbow is measured and the industrialization is online uses etc.
Description
Technical field
The utility model relates to biphase gas and liquid flow fields of measurement, is specifically related to a kind of multiparameter such as particle diameter, refractive index, temperature of dual wavelength to spray droplet that adopt and distributes the whole audience rainbow measurement mechanism directly measured without any need for special calibration process.
Background technology
The atomization of liquid is the phenomenon that the industrial circle such as the energy, chemical industry extensively exists.Measure exactly and control the many kinds of parameters of spray droplet in complicated spray flow field, to reasonably organizing spray burning process, improving burning efficiency and reducing pollutant emission, there is important directive function.Traditional contact measurement method, the methods such as such as immersion method, tracing, sedimentation, freezing process, molten cured method and instantaneous sample method, maybe cannot go deep into the inner parameter of measuring object owing to destroying original measuring object and be difficult to adapt to current high-acruracy survey demand.And the advanced measuring method of non-interfering type, the methods such as such as laser Doppler vibration (LDV, LDA), light speckle velocity measuring technique (LSV), Particle Image Velocimetry (PIV, PTV), two-color laser induced fluorescence method (TLIF), induced with laser phosphorimetry (LIP), planar laser-induced fluorescence method (PLIF) be all difficult to realize the key parameters such as the particle diameter of atomized drop, concentration, component and temperature simultaneously, accurately, the measurement of multiple spot.Compared with above-mentioned measuring technique, rainbow measuring technique has accurately measures atomization droplets diameter and temperature (or component) feature simultaneously, can precision real time measuring atomized drop particle diameter, temperature (or composition) distribution and development law, the announcement for atomization gas liquid two-phase mechanism is significant.
Rainbow measuring technique needs to carry out primary system demarcation in the position of target measurement object in system process of establishing, namely determines that measurement point spray droplet mass-sends out the absolute scatter angle of scattered light and the internal relation of CCD pixel.Due to the inversion result of rainbow signal, as the parameter such as refractive index and domain size distribution is very responsive to scattering angle, therefore the precision of calibration process directly determines validity and the accuracy of rainbow signal inversion result.But existing catoptron standardization and fluid column standardization all need extra artificial demarcation.Therefore, cause extra gauging instrument (as universal stage, microscope scale etc.) accuracy requirement high, operating process is comparatively complicated, and light path slight change just needs again to build calibration system, be difficult to expansion and apply to one dimension rainbow measuring system, be unfavorable for the application on site of rainbow technology.
Utility model content
The technical problems to be solved in the utility model is, overcomes defect of the prior art, provides a kind of scattering angle self-calibration whole audience rainbow measurement mechanism based on dual wavelength.Its objective is to provide to possess whole audience rainbow measurement mechanism simple for structure, easy and simple to handle, to exempt from extra high precision measuring instrument (the high-precision rotary platform etc. as in classical inverse light microscopic scattering angle scaling method) feature.
For technical solution problem, the utility model provides a kind of scattering angle self-calibration whole audience rainbow measurement mechanism based on dual wavelength, comprises spraying generating unit, laser emission element, signal collection unit and signal processing unit four part;
Described laser emission element is made up of three parts:
The semiconductor laser that two wavelength are different, for generation of the laser beam of two kinds of different wave lengths;
Modulator element is a beam splitter being contained on swing offset platform, for becoming to overlap for a branch of laser by the Laser Modulation of two bundle different wave lengths; And
Reflective mirror platform system, the incoming position being a branch of LASER Light Source for regulating coincidence and incident angle, the rainbow signal direction that spray droplet grain is produced overlaps with the primary optical axis of described rainbow signal collecting unit;
Described signal collection unit refers to: the Fourier's imaging system be made up of field-of-view lens, aperture and imaging len, and a color CCD chip;
Described signal processing unit refers to, the computer processing system be connected with color CCD chip, for calculating, spray droplet refractive index, particle diameter and concentration that analysis to measure obtains, temperature or component data.
In the utility model, described semiconductor laser is respectively blue laser and red laser, and two semiconductor lasers are fixed on a swing offset platform separately; The horizontal shift repetitive positioning accuracy of swing offset platform is less than 0.005cm, and rotation angle resolution is 0.00125 °.
In the utility model, the diameter of described field-of-view lens and imaging len is 80mm ~ 120mm, and focal length is 100mm ~ 250mm.
In the utility model, described color CCD chip is the adjustable linear CCD of frame frequency, pixel coverage is 1M to 16M, highest frequency is 30Hz, detection rainbow angle annex scope is 10 ° to 20 °, angle of minimum resolution be 0.002 ° (according to the difference of measuring object and measuring condition, adjustment CCD time shutter and laser instrument incident angle of light and intensity can be selected, thus reach best measurement effect).
Compared with prior art, the beneficial effects of the utility model are:
The utility model can produce the laser of two bundle different wave lengths and then obtain the rainbow signal of two kinds of wavelength, then processes by passing to computer processing system after colored CCD record.Have simple for structure, easy and simple to handle, exempt from extra high precision measuring instrument (the high-precision rotary platform etc. as in classical inverse light microscopic scattering angle scaling method), be applicable to being extended to one dimension rainbow and measure and the feature such as industrialization application on site.
Accompanying drawing explanation
Fig. 1 is the one-piece construction schematic diagram of the utility model measurement mechanism.
Reference numeral is: 1 spraying system; 2 field-of-view lens; 3 apertures; 4 imaging lens; 5 color CCD chip; The laser instrument of 6 the first wavelength; The laser instrument of 7 the second wavelength; 8 beam splitters; 9 catoptrons.
Embodiment
Below by embodiment, and by reference to the accompanying drawings the embodiment of technical solutions of the utility model is described in detail.
As shown in Figure 1, the utility model device comprises: spraying generating unit, laser emission element, signal collection unit and signal processing unit four part;
1, spraying system generating unit, mainly comprises spraying system 1, for generation of the liquid spray field of various drop parameter;
2, laser emission element, is made up of three parts:
The semiconductor laser that two wavelength are different, for generation of the laser beam of two kinds of different wave lengths;
Modulator element is a beam splitter 8 being contained on swing offset platform, for becoming to overlap for a branch of laser by the Laser Modulation of two bundle different wave lengths; And reflective mirror platform system, the incoming position being a branch of LASER Light Source for regulating coincidence and incident angle, the rainbow signal direction that spray droplet grain is produced overlaps with the primary optical axis of described rainbow signal collecting unit;
The laser instrument (laser instrument 6 of the first wavelength, the laser instrument 7 of the second wavelength) of two kinds of different wave lengths is arranged vertically in same level, ensures that two bundle laser intersect vertically in same level; Place a sizeable beam splitter 8 in two bundle laser intersections, the angle of adjustment beam splitter 8 and horizontal level, make two bundle incident lights after the coated glass in beam splitter 8, be separated into vertical two-beam (reflected light and transmitted light) all respectively; Now can see that two sides of beam splitter 8 have all occurred that coincidence is the hybrid laser of 1 bundle; Get wherein parallel with rainbow light path system that to restraint hybrid laser irradiate spray field with proper angle after filling catoptron 9 on a spinstand;
3, signal collection unit, comprises field-of-view lens 2, aperture 3, imaging len 4 and color CCD chip 5, for the scattered light signal of two kinds of wavelength near spray droplet rainbow angle is projected color CCD chip 5 through Fourier Optical System.The diameter of field-of-view lens 2 and imaging len 4 is 100mm, and focal length is 150mm.Establish aperture 3 on rear side of field-of-view lens 2, its aperture size is about 2 ~ 4mm; From the scattered light of two kinds of wavelength that the drop of spraying system 1 generation sends, successively by entering color CCD chip 5 after field-of-view lens 2, aperture 3, imaging len 4.Be provided with optical attenuator and optical filter (not shown) before color CCD chip 5, color CCD chip 5 is provided with the height adjuster for adjusting height.Be provided with double channel line array CCD in color CCD chip 5, sensing unit number is 2160, and long 14 μm of each unit, wide 14 μm, highest frequency is 30MHz, and search angle scope is 0 to 260 °, and angle of minimum resolution is 0.0016 °.
4, signal processing unit, refer to and the computer processing system that color CCD chip 5 is connected, for obtaining calibration curve characteristic parameter after the rainbow signal of two kinds of wavelength that is recorded to by colored CCD as calculated machine process, and obtain follow-up surveyed spray droplet refractive index, particle diameter and concentration, temperature or group gradation parameter.
Based on the measurement mechanism in the utility model, can realize measuring based on the scattering angle self-calibration whole audience rainbow of dual wavelength by following method, concrete steps are exemplified below:
(1) blue laser (435nm) and red laser (wavelength 635nm) are launched two bundle laser through beam splitter 8 be modulated into a branch of after, irradiate the spray field of normal temperature deionised water, the scattered light signal of these two kinds of wavelength is produced in spray field back scattering district, the Fourier's imaging system formed through small holes diaphragm 3, imaging len 4 after being collected by field-of-view lens 2 projects on color CCD chip 5, is recorded to the rainbow signal light intensity of these two kinds of wavelength simultaneously;
(2) rainbow signal of these the two kinds of wavelength be recorded to by color CCD chip 5 carries out R, G, B Signal separator, obtain each self-corresponding passage gray-scale value of rainbow signal of two kinds of wavelength (435nm and 635nm) in image, thus obtain the relation curve between two rainbow signal light intensity be separated and pixel column;
(3) relation curve between above-mentioned two rainbow signal light intensity and pixel column can obtain two level and smooth rainbow curves through Fast Fourier Transform (FFT) FFT filtering and IFFT inverse operation.The light intensity (ordinate) of rainbow curve is carried out 0-1 normalized, finds light intensity in these two level and smooth rainbow curves to be pixel column coordinate (horizontal ordinate) pix of 0.468
rg1and pix
rg2, namely these two row coordinates correspond to the geometrical optics rainbow angle θ under two kinds of wavelength
rgand θ
rg2;
(4) according to the known refractive index m of (as 20 DEG C) deionized water under different wave length laser during uniform temperature
1, m
2, calculate geometrical optics rainbow angle θ under these two kinds of wavelength
rgand θ
rg2size.Two coordinate points (pix can be obtained by step (3)
rg1, θ
rg1), (pix
rg2, θ
rg2), according to the near-linear relation in paraxial light path between rainbow absolute scatter angle and pixel column, the linear relation between pixel column and scattering angle can be extrapolated, obtain characteristic parameter a, b in initial alignment equation (angle=a+b × pixel);
(5) take according to initial alignment equation and CCD the rainbow images obtained and inverting can obtain one group of refractive index inverting value m
10, m
20, by this inverting value and known refractive index m
1, m
2relatively, if m
10with m
1, m
20with m
2the difference of at least one pair of is had to be not less than 0.0001, according to the positive negativity of difference of inverting value and given value to m
1, m
2revise downward or upward, revised refractive index again calculates rainbow angle as iteration call by value and obtains calibration equation characteristic parameter;
(6) step (5) is repeated, start iteration, until the difference that iteration under two kinds of wavelength substitutes into the refractive index that refractive index obtains with inverting thus is all less than 0.0001, iteration terminates, namely think that current calibration equation characteristic parameter is effective, scattering angle self-calibration process completes.
(7) whole audience rainbow calibration equation (angle=a+b × pixel) can be calculated by effective calibration equation characteristic parameter a, b value at the end of iteration in (6), the absolute scatter angle on CCD corresponding to each pixel column can be learnt by calibration equation, and then conventional whole audience rainbow measurement and signal transacting can be carried out, namely domain size distribution and the refractive index data of target liq spraying is obtained, and combine the relation of refractive index and solution concentration, temperature and the component obtained, just can be back-calculated to obtain the concentration of drop, temperature and component.
It is pointed out that a kind of description that extend application of content just to the utility model device of said method, but do not form technology limiting of the present utility model.Technical purpose of the present utility model realizes and does not rely on the function support of embedded software in computer processing system.On basis of the present utility model, other measuring method can also be had can to realize similar object, those skilled in the art all can self-developing based on its technical capability.Because this part content does not belong to category of the present utility model, therefore no longer launch to describe.
Claims (4)
1., based on a scattering angle self-calibration whole audience rainbow measurement mechanism for dual wavelength, comprise spraying generating unit, laser emission element, signal collection unit and signal processing unit four part; It is characterized in that,
Described laser emission element is made up of three parts:
The semiconductor laser that two wavelength are different, for generation of the laser beam of two kinds of different wave lengths;
Modulator element is a beam splitter being contained on swing offset platform, for becoming to overlap for a branch of laser by the Laser Modulation of two bundle different wave lengths; And
Reflective mirror platform system, the incoming position being a branch of LASER Light Source for regulating coincidence and incident angle, the rainbow signal direction that spray droplet grain is produced overlaps with the primary optical axis of described rainbow signal collecting unit;
Described signal collection unit refers to: the Fourier's imaging system be made up of field-of-view lens, aperture and imaging len, and a color CCD chip;
Described signal processing unit refers to, the computer processing system be connected with color CCD chip, for calculating, spray droplet refractive index, particle diameter and concentration that analysis to measure obtains, temperature or component data.
2. device according to claim 1, is characterized in that, described semiconductor laser is respectively blue laser and red laser, and two semiconductor lasers are fixed on a swing offset platform separately; The horizontal shift repetitive positioning accuracy of swing offset platform is less than 0.005cm, and rotation angle resolution is 0.00125 °.
3. device according to claim 1, is characterized in that, the diameter of described field-of-view lens and imaging len is 80mm ~ 120mm, and focal length is 100mm ~ 250mm.
4. device according to claim 1, is characterized in that, described color CCD chip is the adjustable linear CCD of frame frequency, and pixel coverage is 1M to 16M, and highest frequency is 30Hz, and detection rainbow angle annex scope is 10 ° to 20 °, and angle of minimum resolution is 0.002 °.
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| CN108414408A (en) * | 2018-03-21 | 2018-08-17 | 浙江大学 | A kind of compact-sized coaxial-type whole audience rainbow drop measurement probe |
| CN110441200A (en) * | 2018-05-04 | 2019-11-12 | 长沙青波光电科技有限公司 | A kind of laser measuring device for measuring |
| CN110441199A (en) * | 2018-05-04 | 2019-11-12 | 长沙青波光电科技有限公司 | A kind of laser measuring device for measuring |
| CN111307809A (en) * | 2020-02-24 | 2020-06-19 | 浙江大学 | Small pipeline gas-liquid two-phase flow phase distribution optical detection system and method |
| CN115047479A (en) * | 2022-08-12 | 2022-09-13 | 中北大学 | Cloud and smoke interference recognition device for unmanned aerial vehicle laser altimeter |
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2015
- 2015-07-08 CN CN201520498415.6U patent/CN204789239U/en active Active
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108414408A (en) * | 2018-03-21 | 2018-08-17 | 浙江大学 | A kind of compact-sized coaxial-type whole audience rainbow drop measurement probe |
| CN108414408B (en) * | 2018-03-21 | 2024-02-20 | 浙江大学 | Coaxial full-field rainbow liquid drop measuring probe with compact structure |
| CN110441200A (en) * | 2018-05-04 | 2019-11-12 | 长沙青波光电科技有限公司 | A kind of laser measuring device for measuring |
| CN110441199A (en) * | 2018-05-04 | 2019-11-12 | 长沙青波光电科技有限公司 | A kind of laser measuring device for measuring |
| CN110441199B (en) * | 2018-05-04 | 2022-07-15 | 长沙青波光电科技有限公司 | Laser measuring device |
| CN110441200B (en) * | 2018-05-04 | 2022-07-15 | 长沙青波光电科技有限公司 | Laser measuring device |
| CN111307809A (en) * | 2020-02-24 | 2020-06-19 | 浙江大学 | Small pipeline gas-liquid two-phase flow phase distribution optical detection system and method |
| CN115047479A (en) * | 2022-08-12 | 2022-09-13 | 中北大学 | Cloud and smoke interference recognition device for unmanned aerial vehicle laser altimeter |
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