CN106908360A - A kind of laser particle size analyzer with annular measuring cell - Google Patents
A kind of laser particle size analyzer with annular measuring cell Download PDFInfo
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- CN106908360A CN106908360A CN201710233885.3A CN201710233885A CN106908360A CN 106908360 A CN106908360 A CN 106908360A CN 201710233885 A CN201710233885 A CN 201710233885A CN 106908360 A CN106908360 A CN 106908360A
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- measuring cell
- detector
- annular measuring
- annular
- particle size
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
- G01N15/02—Investigating particle size or size distribution
- G01N15/0205—Investigating particle size or size distribution by optical means, e.g. by light scattering, diffraction, holography or imaging
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
- G01N2015/03—Electro-optical investigation of a plurality of particles, the analyser being characterised by the optical arrangement
- G01N2015/035—Electro-optical investigation of a plurality of particles, the analyser being characterised by the optical arrangement the optical arrangement forming an integrated apparatus with the sample container
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- Dispersion Chemistry (AREA)
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Abstract
The invention discloses a kind of laser particle size analyzer with annular measuring cell, including laser, lens, pin hole, cylindrical mirror, annular measuring cell, detector assembly；Laser, lens, pin hole, cylindrical mirror, annular measuring cell is in same optical axis and is sequentially arranged on frame；Detector assembly includes central detector, main detector, several big angle detectors, big angle detector circularizes laying centered on annular measuring cell, after main detector, the annular measuring cell is the glass annulated column of cylindrical structure to central detector, and its middle part is provided with cylindrical cavity；The through hole of the pin hole position, annular measuring cell center and main detector is arranged on above-mentioned optical axis；A kind of laser particle size analyzer with annular measuring cell of the invention, its simple for structure, stable performance, especially has good effect in submicron particles measurement.
Description
Technical field
The present invention relates to instrument field, more particularly to a kind of laser particle size analyzer with annular measuring cell.
Background technology
Laser particle size analyzer is the granularity point using grain optical scattering principle measurement emulsion, powder body material and liquid spray
The instrument of cloth.It is appeared in after laser is born, so far the existing history of 50 years or so.Because particle is smaller, angle of scattering is got over
Greatly；In order to extend the measurement lower limit of instrument, it is necessary to expand the measurement range of angle of scattering.Traditionally, all it is parallel to each other with two pieces
Plate glass constitutes measuring cell, and candidate particles are suspended between two blocks of glass.Because the medium for the candidate particles that suspend is more
It is liquid, and the refractive index of liquid is more than air, therefore when angle of scattering is more than certain limit, scattering light cannot shine air
In, so as to limit short grained measurement.Angle of scattering is totally reflected more than the scattering light of critical angle, it is impossible in shining air,
And can not be received by a detector, measure.By taking aqueous medium as an example, critical angle is 47.87 °.If using traditional technology, can be tested
The maximum scattering angle measured is less than critical angle, and measurement lower limit can only achieve 0.3 μm or so.
In order to expand angle measurement range, there has been proposed various methods, such as multiple beam technology.In the technical scheme,
In addition to original main incident light, the illumination light of a branch of oblique incidence is increased in addition, by the beam lighting particle produce compared with
Large-angle scatter light relative to rear glass incidence angle still not less than the critical angle of water-air equivalent interface, therefore remain to shine sky
In gas, so as to be received.In this technology, oblique incidence illumination light is only used for measurement big angle (such as more than 45 °) scattering light, and
Main incident light can only be used for measuring small-angle scattering light.Before carrying out granularity data Inversion Calculation, it is necessary to big angle and small-angle scattering light
Data be first stitched together.Because illuminating bundle is different, the splicing of data is often difficult to be made very smooth therefore anti-to data
Drill and bring difficulty.
It has also been proposed that solving the problems, such as total reflection with trapezoidal window technique.It is instead of with one block of trapezoidal glass
Back side plate glass in traditional measurement pond.The program can be illuminated with single beam, more succinct than foregoing dual-beam method.Big angle
When scattering light is from glass toward air outgoing, original parallel surface becomes inclined-plane, reduces light to glass-Air Interface
Incidence angle, so as to avoid the generation of total reflection.Small-angle scattering light is then from parallel surface outgoing.Light that it has the disadvantage inclined-plane outgoing and
The light of parallel surface outgoing some can the superposition of aerial the same area, interfere.In order to solve this problem, it is necessary to
Increase more complicated mechanical structure.
Cylindrical lens window technique (license notification number：CN202281738U it is also) that a kind of supercritical angles scattering light goes out
The solution of problem is penetrated, in 45 ° -135 ° of scattering light is shone air, so as to be detected.Laser sends
Slit of the illumination light between plate glass be irradiated to measurement zone, the suspension containing tested particle is in slit.Greatly
Angle scattering light passes through plate glass, and is glued superincumbent focus of cylindrical mirror.Detector array is on the focal plane of cylindrical mirror.
According to invention person, this scheme is applied to the scattering light for measuring more than 45 °, and the scattering light of low-angle does not know how to receive.
The patent document (hereinafter referred to as " document 2 ") of application number 201310186026.5 is emulsified in proposing a kind of detection water
The scheme of oil content.The program is placed in emulsion to be measured in drum-shaped (" annular " i.e. alleged by this patent) measuring cell, uses
The semiconductor laser of near-infrared makees light source, and illumination is mapped in measuring cell, after light runs into candidate particles, it may occur that scattering.
Small-angle scattering light is measured with multiunit photodetector array, emulsion contains during then the distribution according to scattering light calculates water
Amount.This scheme is closely similar to the eye with the scheme of this patent, is mainly manifested in：(1) measurement object is all the particle in water
Thing；(2) cylindrical shape measuring cell is all employed；(3) all it is to measure the distribution for scattering light.But from terms of efficiency and thinking, two schemes
There is significant difference：The patent claims only measure small-angle scattering light, so we may determine that, it only make use of the liquid of cylinder
Bearing function and transparent characteristic.If this cylinder is changed into the transparent vessel of the other shapes such as rectangle, semicircle, can also realize
Same effect alleged by the patent.Actually from terms of optical professional angle, measuring cell is parallel-laid into spaced flat with two pieces
Glass sheet scheme is more suitable.
In sum, existing laser particle analyzer there is scattering optical detection scope be small or data inversion is difficult or
Many deficiencies such as complex structure.
The content of the invention
The technical problem to be solved in the present invention is to provide a kind of laser particle size analyzer with annular measuring cell, and it can be real
Under conditions of existing single beam illumination, 0 ° to the 180 ° continuous probe of scattering light, and the focusing of enough accuracy is realized, overcome existing
Many deficiencies of technology.Its measurement upper limit can keep the level of prior art, and measurement lower limit then can smoothly reach 20nm,
I.e. 0.02 μm (peak).
In order to solve the above-mentioned technical problem, the technical scheme is that a kind of laser particle size analysis with annular measuring cell
Instrument, including laser, lens, pin hole (sheet metal with micropore), cylindrical mirror, annular measuring cell, detector assembly, frame；
The detector assembly includes central detector, main detector, several big angle detectors；
The laser, lens, pin hole, cylindrical mirror, annular measuring cell and main detector is in same optical axis and sets successively
On frame；
The big angle detector circularizes laying centered on annular measuring cell, central detector located at main detector it
Afterwards；
The annular measuring cell is the glass annulated column of cylindrical structure, and its middle part is provided with cylindrical cavity, for holding liquid
Body, the liquid contained by cylindrical mirror, the glass wall of annular measuring cell and its inner chamber constitutes a lens group, is sent from pin hole
Light can focus on the center of main detector through the lens group；
The pin hole is the sheet metal with micropore.
The cylindrical mirror is piano convex cylindrical lens；
The optical parametric and putting position of the cylindrical mirror, the internal-and external diameter of annular measuring cell and the refractive index of glass, Ying Xuan
Select suitable numerical value so that the light sent from the pin hole center is by the cylindrical mirror, the front and rear pool wall of annular measuring cell
After the liquid held with pond inner chamber, can focus on the centre bore of main detector.
Preferably, the annular measuring cell inner cavity top by conduit connect sample cell, the sample cell include agitator,
Ultrasonic transducer；
The annular measuring cell intracavity bottom is connected with pulsating pump, circulating pump, battery valve by conduit；
Pin hole is to the centre bore of distance and the main detector at the center of measuring cell to the center of measuring cell in a typical case
Distance it is equal.
The annular radii of big angle detector institute ring cloth and measuring cell center to main detector centre bore or the distance phase of pin hole
Deng.
Its operation principle is：Laser sends beam of laser, through lens focus, is placed through the pin hole on lens focal plane,
Again by cylindrical mirror, annular measuring cell is irradiated to, is irradiated to again through pool wall on the particle in pond.The part quilt of illumination light
Grain scattering a, part is continued to move ahead by the original direction of propagation, again passes through the ring glass of annular measuring cell, is focused on master
On the centre bore of detector, the centre bore is then passed through, be irradiated in central detector.Illuminating bundle is through being run into after pin hole
Cylindrical mirror, the liquid column in the transparent pool wall of annular measuring cell and pond constitutes a lens group.Pin hole center and main detector
Center for lens group image each other.The light being scattered by the particles will deviate from the original direction of propagation, the ring of directive measuring cell
Shape glass pool wall, through after pool wall, is irradiated in each unit of each unit of main detector array and big angle detection.Typical case
Under, the center of each unit of big angle detector and the center of main detector and pin hole is on same circumference.It is irradiated to each spy
After the scattering light surveyed on unit is converted into electric signal, become data signal by data collecting system, then be transferred to computer.
Computer goes out the Size Distribution of particle according to the distribution for scattering light, Inversion Calculation.
Using above-mentioned technical proposal, due to the setting of annular measuring cell so that scatter light through the mistake of pool wall air inlet
Total reflection is avoided in journey, outgoing and the Receiver Problem of large-angle scatter light and small-angle scattering light is solved.
Because annular measurement pool structure is the cylinder feature using suspension media in the annulus feature of its pool wall and pond, together
When solve outgoing and the Receiver Problem of large-angle scatter light and small-angle scattering light.Its annulus feature, immediate vicinity any direction in pond
Scattering light pool wall is all incided with approximately perpendicular angle, therefore evaded the problem of total reflection.In small angular direction, this programme
Using liquid in pond and the cylindrical mirror effect of pool wall glass, and an increased cylindrical lens in input path, realize
The well focussed of incident light and small-angle scattering light in main detection plane, while also achieving the outgoing of large-angle scatter light and appropriate
Focus on, simplify the structure of instrument.
Brief description of the drawings
Fig. 1 is a kind of structural representation of laser particle size analyzer with annular measuring cell of the invention；
Fig. 2 is to scatter the outgoing of light and receive schematic diagram.
Specific embodiment
Specific embodiment of the invention is described further below in conjunction with the accompanying drawings.Herein it should be noted that for
The explanation of these implementation methods is used to help understand the present invention, but does not constitute limitation of the invention.Additionally, disclosed below
As long as each implementation method of the invention in involved technical characteristic do not constitute conflict each other and can just be mutually combined.
As shown in figure 1, a kind of laser particle size analyzer with annular measuring cell, including laser 1, lens 2, pin hole 3, post
Face mirror 4, annular measuring cell 5, detector assembly, frame；Laser 1, lens 2, pin hole 3 (sheet metal with micropore), cylinder
Mirror 4, annular measuring cell 5 is in same optical axis and is sequentially arranged on frame；Detector assembly includes central detector 61, main spy
Device 62 (including 33 independent probe units), several big angle detectors 63 are surveyed, big angle detector 63 is with annular measuring cell 5
Center circularizes laying, and central detector 61 is after main detector 62；
The pin hole 3 is the sheet metal with micropore；
The annular measuring cell 5 is the glass annulated column of cylindrical structure, and its middle part is provided with cylindrical cavity, inner chamber conducting two
End face, can hold the mixed liquor of liquid and tested particle composition in chamber；
The pin hole 3, annular measuring cell 5, main detector 62 are arranged in same optical axis；
The cylindrical mirror 4 is piano convex cylindrical lens；
Preferably, the inner cavity top of annular measuring cell 5 connects sample cell by conduit, and the sample cell includes stirring
Device, ultrasonic transducer；
The intracavity bottom of annular measuring cell 5 is connected with pulsating pump, circulating pump, battery valve by conduit；
Pin hole 3 arrives the distance at center and the centre bore of main detector 62 to annular of annular measuring cell 5 in a typical case
The distance at the center of measuring cell 5 is equal.
As illustrated, sending beam of laser from laser 1, focused on through lens 2, be placed through the pin hole on the focal plane of lens 2
3, then by cylindrical mirror 4 (its profile such as 41), annular measuring cell 5 is irradiated to, it is irradiated to the particle 7 in pond again through pool wall
On.A part for illumination light is scattered by particle 7, and a part is continued to move ahead by the original direction of propagation, again passes through annular measurement
The ring glass in pond 5, is focused on the centre bore of main detector 62, is then passed through the centre bore, is irradiated to central detector 61
On.Illuminating bundle passes through the cylindrical mirror 4 run into after pin hole 3, the liquid column in the transparent pool wall of annular measuring cell 5 and pond, group
Into a lens group.The pin hole center of pin hole 3 and the center of main detector 62 are for lens group image each other.Dissipated by particle
The light penetrated will deviate from the original direction of propagation, and the ring glass pool wall of directive measuring cell 5 through after pool wall, is irradiated to main detection
In each unit of device 62 and each unit of big angle detection 63.In typical case, each unit and main detector of big angle detector 63
62 center and the center of pin hole are on same circumference.The scattering light being irradiated on each probe unit is converted into electric signal
Afterwards, become data signal by data collecting system, then be transferred to computer.Computer is according to the distribution for scattering light, inverting meter
Calculate the Size Distribution of particle.
As shown in Fig. 2 the laser particle size analyzer with annular measuring cell is caused from the center of annular measuring cell 5 (i.e. cylinder
Center) the scattering light of any direction (such as angle of scattering be θ) that sends, when inciding the surface of pool wall glass, incidence angle is equal
It is 0, it is thus possible in smoothly shining air.The scattering light of the equal angular that other positions send, by liquid column and pool wall
The refraction action of the equivalent cylindrical mirror of composition, in also shining air, and to centers scatter light in corresponding probe unit (example
Such as, big angle detector 63) on focus on.When angle of scattering very little, scattering light will be implemented around ideal in the centre bore of main detector 62
Focus on.To large-angle scatter light, such as scatteringangleθ is 60 °, although the scattering light that diverse location sends focuses on not ideal enough but poly-
The angle measurement error that burnt error (aberration) is caused can be ignored for angle of scattering.So this patent can realize list
Under conditions of beam lighting, 0 ° to the 180 ° continuous probe of scattering light, and the focusing of enough accuracy is realized, overcome prior art
Many deficiencies.After above-mentioned technology, the measurement upper limit of laser particle analyzer can keep the level of prior art, and under measuring
Limit then can smoothly reach 20nm, i.e., 0.02 μm (peak).
Embodiments of the present invention are explained in detail above in association with accompanying drawing, but the invention is not restricted to described implementation
Mode.For a person skilled in the art, in the case where the principle of the invention and spirit is not departed from, to these implementation methods
Various changes, modification, replacement and modification are carried out, is still fallen within protection scope of the present invention.
Claims (7)
1. a kind of laser particle size analyzer with annular measuring cell, including laser, lens, pin hole, cylindrical mirror, annular measurement
Pond, detector assembly, frame；It is characterized in that：The detector assembly includes central detector, main detector, several are big
Angle detector；
The laser, lens, pin hole, cylindrical mirror, annular measuring cell and main detector are in same optical axis and are sequentially arranged in machine
On frame；
The big angle detector circularizes laying centered on annular measuring cell, and central detector is after main detector；
The annular measuring cell is the glass annulated column of cylindrical structure, and its middle part is provided with cylindrical cavity, for holding liquid, by
The liquid that cylindrical mirror, the glass wall of annular measuring cell and its inner chamber are contained constitutes a lens group, from the light that pin hole sends
The center of main detector can be focused on through the lens group；
The pin hole is the sheet metal with micropore.
2. the laser particle size analyzer with annular measuring cell according to claim 1, it is characterised in that：The pin hole, ring
Shape measuring cell, main detector are arranged in same optical axis.
3. the laser particle size analyzer with annular measuring cell according to claim 1, it is characterised in that：The cylindrical mirror is
Piano convex cylindrical lens.
4. the laser particle size analyzer with annular measuring cell according to claim 1, it is characterised in that：The big angle detection
The radius of the annulus that device is distributed is equal to the measuring cell center to the distance of the main detector.
5. according to the laser particle size analyzer of any described band annular measuring cell in claim 1-4, it is characterised in that：It is described
Annular measuring cell inner cavity top connects sample cell by conduit, and the sample cell includes agitator, ultrasonic transducer.
6. the laser particle size analyzer with annular measuring cell according to claim 5, it is characterised in that：The annular measurement
Pond intracavity bottom is connected with pulsating pump, circulating pump, battery valve by conduit.
7. the laser particle size analyzer with annular measuring cell according to claim 6, it is characterised in that：The pin hole to survey
The distance at center for measuring pond is equal with the distance at the center of the centre bore of main detector to measuring cell.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710233885.3A CN106908360A (en) | 2017-04-11 | 2017-04-11 | A kind of laser particle size analyzer with annular measuring cell |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710233885.3A CN106908360A (en) | 2017-04-11 | 2017-04-11 | A kind of laser particle size analyzer with annular measuring cell |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109520898A (en) * | 2019-01-22 | 2019-03-26 | 河北工业大学 | A kind of laser particle size measurement method of cylindrical lens transformation |
| CN112255150A (en) * | 2020-10-13 | 2021-01-22 | 山东大学 | Laser particle analyzer for realizing omnibearing measurement and measurement method |
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| JPH02203246A (en) * | 1989-01-31 | 1990-08-13 | Shimadzu Corp | Grain size distribution measuring instrument |
| US20020147563A1 (en) * | 2001-02-26 | 2002-10-10 | Dietmar Lerche | Method and device for accelerated stability analysis |
| US20030147074A1 (en) * | 2001-12-19 | 2003-08-07 | Tetsuji Yamaguchi | Sample supplying device for a dry particle-size distribution measuring apparatus and method |
| CN1760660A (en) * | 2004-10-12 | 2006-04-19 | 珠海欧美克科技有限公司 | Laser granularity meter |
| CN103063573A (en) * | 2011-10-18 | 2013-04-24 | 波特诺瓦分析有限公司 | Collimating system for multi-angle light diffusion detector |
| CN103278463A (en) * | 2013-05-17 | 2013-09-04 | 天津大学 | Detection device and method for content of emulsified oil in water |
| CN105973772A (en) * | 2016-07-01 | 2016-09-28 | 丹东百特仪器有限公司 | Laser granularity measurement instrument with combination of dynamic and static light scattering |
| CN206772766U (en) * | 2017-04-11 | 2017-12-19 | 珠海真理光学仪器有限公司 | A kind of laser particle size analyzer of band annular measuring cell |
-
2017
- 2017-04-11 CN CN201710233885.3A patent/CN106908360A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02203246A (en) * | 1989-01-31 | 1990-08-13 | Shimadzu Corp | Grain size distribution measuring instrument |
| US20020147563A1 (en) * | 2001-02-26 | 2002-10-10 | Dietmar Lerche | Method and device for accelerated stability analysis |
| US20030147074A1 (en) * | 2001-12-19 | 2003-08-07 | Tetsuji Yamaguchi | Sample supplying device for a dry particle-size distribution measuring apparatus and method |
| CN1760660A (en) * | 2004-10-12 | 2006-04-19 | 珠海欧美克科技有限公司 | Laser granularity meter |
| CN103063573A (en) * | 2011-10-18 | 2013-04-24 | 波特诺瓦分析有限公司 | Collimating system for multi-angle light diffusion detector |
| CN103278463A (en) * | 2013-05-17 | 2013-09-04 | 天津大学 | Detection device and method for content of emulsified oil in water |
| CN105973772A (en) * | 2016-07-01 | 2016-09-28 | 丹东百特仪器有限公司 | Laser granularity measurement instrument with combination of dynamic and static light scattering |
| CN206772766U (en) * | 2017-04-11 | 2017-12-19 | 珠海真理光学仪器有限公司 | A kind of laser particle size analyzer of band annular measuring cell |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109520898A (en) * | 2019-01-22 | 2019-03-26 | 河北工业大学 | A kind of laser particle size measurement method of cylindrical lens transformation |
| CN112255150A (en) * | 2020-10-13 | 2021-01-22 | 山东大学 | Laser particle analyzer for realizing omnibearing measurement and measurement method |
| CN112255150B (en) * | 2020-10-13 | 2021-10-29 | 山东大学 | Laser particle analyzer for realizing omnibearing measurement and measurement method |
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