CN1475789A - Settling type laser reflection image point granularity measuring method - Google Patents
Settling type laser reflection image point granularity measuring method Download PDFInfo
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- CN1475789A CN1475789A CNA031282571A CN03128257A CN1475789A CN 1475789 A CN1475789 A CN 1475789A CN A031282571 A CNA031282571 A CN A031282571A CN 03128257 A CN03128257 A CN 03128257A CN 1475789 A CN1475789 A CN 1475789A
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Abstract
A settling-type laser reflected image point method for measuring the granularity of particle includes spreading laser beam to become planar beam, radiating a liquid-solid gravitational settling system composed of the particles to be tested while reflecting laser to form high-intensity image points, processing them by photography and dynamic video images to obtain vertical moving speed, and finding out the granularities of particles and their distribution according to Stokes settling speed law.
Description
Technical field
The present invention relates to powder scientific and engineering field, be specifically related to the particle test technology.
Background technology
Powder is the aggregate of solid particle.Particle size also is the size and the distribution value of granularity, is about of paramount importance parameter in the particle geometric characteristic, and therefore the performance of appreciable impact powder and purposes, also are important contents in the particle test technology to the sign of grain graininess and distribution situation.
Existing grain graininess measuring method has multiple, mainly comprises: direct observational method, as the still image analytic approach of optical microscope or electron microscope; Sieve method is sent out as vibrosieve and sound wave screening; Sedimentation settling methods such as sees through as picnometer, specific gravity balance, sedimentation balance, light transmission and X-ray, or light transmission and X ray such as see through at the centrifugal force sedimentation; Laser method is as laser diffraction, laser light scattering and laser photon coherent method; The electro-induction method is passed through the electro-induction method as aperture; And light scattering method, acoustic scattering method, fluid penetrant method and absorption method equigranular mensuration.In addition, also comprise ultrasonic wave diffraction method, light pulsation method and light extinction method equigranular on-line testing method.
In above various granulometry methods, light transmission settling methods and X-ray see through settling methods, and measuring principle, grain diameter characteristic and distribution benchmark and the scope of application of laser diffraction, scattering method are described as follows:
Light transmission settling methods and X-ray see through settling methods, both all change with the light intensity of the tested particle suspension liquid of light transmission, obtain the suspension concentration change value on definite settling height and the time point, draw the percentage by weight of particle thus, the corresponding grain diameter of percentage by weight is then obtained by Stokes settling velocity law therewith, promptly obtains grain graininess and distribution value.Light transmission settling methods and X-ray see through settling methods, and both differences only are light source: the former is a white light, and the latter is the X-ray of extension naturally of white light; Both have common measuring principle: measure suspension concentration and change the relative content that obtains particle, obtain grain diameter by Stokes settling velocity law, record grain graininess and distribution value thus; Both have common grain diameter characteristic and distribution benchmark: Stokes particle diameter, weight basis number percent; Both Measuring Time are longer.
Laser method is to be light source with laser, the minor diameter laser beam irradiation is arrived in solid-liquid (or solid and gas) mixed system of tested particle composition, by to the diffraction of particle or the measurement of scattering angle, utilize MieShi theory or Fraunhoffer Theoretical Calculation particle grain size, and count and get size and the relative populations that all measure particles, promptly obtain grain graininess and distribution value.Limit by principle and technical conditions, existing laser particle size is surveyed preparation method, its diffraction or scattering optic angle can only take from laser penetration face (with laser entrance face dorsad), therefore, laser method is limited to the granulometry amount of low solid concentration, and the thickness of measuring vessel is restricted, otherwise the diffraction of particle or scattering angle, with being subjected to signal to accept the refraction and the reflection of other particle on the light path, cause diffraction or scattering angle distortion.This also makes laser method under present technical conditions, is difficult to use in the on-line testing of particle.What laser method recorded is the equal-volume particle diameter, and its distribution benchmark is a volume reference number percent; Measuring Time is short.
Summary of the invention
The objective of the invention is: by the settling velocity of each particle of direct measurement in liquid or gas, obtain the Stokes particle size values of particle, realize high solid concentration, reach all spendable grain graininess of sample analysis and online detection and distribution measuring fast.
The technical solution used in the present invention is: decanter type laser-bounce picture point granulometry method, it is characterized in that laser beam expanding is become planar light beam, liquid-solid (or gas-solid) that irradiation is made up of tested particle mixes the gravity settling system, make the particle that is positioned on the planar light beam because of reflector laser, form high light intensity picture point, and then adopt shooting and video dynamic image to handle means, obtain the movement velocity of each picture point on vertical, be the settling velocity of particle, obtain and corresponding grain graininess of settling velocity and distribution value according to Stokes settling velocity law.
The present invention compares with existing grain graininess measuring method, has the following advantages:
One overcomes the defective that existing high solid concentration of granulometry method and quick measurement can not take into account, and can measure the method for high solid concentration, and measuring speed is slow; The method that can measure fast, it is low to measure concentration.The former influences efficiency of measurement, and the latter gives the division of sample severe with high request.
Its two, existing granulometry method can be applied to the few of online detection in principle and reality, and needs or still be in the stage of improving, the present invention can be used for the online detection of granularity, its principle is more simple, reliably.
Its three, see through settling methods with existing light transmission settling methods and X-ray and compare, the present invention is a light source with the laser beam expanding planar light, its light intensity and plane intensivism improve, and make the laser-bounce picture point of particle be easy to gather the inhibition of making an uproar with the background electricity and handle; The present invention adopts shooting and video dynamic image treatment technology, by the settling velocity of each particle reflection picture point of direct acquisition, comes the Stokes particle size values of count particles, measures fast.And existing sedimentation, its principle is based on the concentration change of measuring the suspension clarifying process and obtains size-grade distribution information, causes Measuring Time long, and is especially tediously long especially to the subparticle Measuring Time.
They are four years old, compare with existing laser method, the present invention is a light source with the laser beam expanding planar light, and just for the laser-bounce picture point that makes particle is easy to gather and more effectively suppress the background electricity make an uproar, and its grain diameter measurement principle is based on the Measurement and analysis to the movement velocity of reflection picture point.Therefore, the present invention is not subjected to existing laser method because of measuring diffraction or scattering angle solid concentration to be had the restriction of strict demand, and it is higher to measure the concentration ratio laser method.
Embodiment
The present invention specifically implements in the following manner:
(1) adopt commercially available laser instrument as measurement light source, laser power 5～20mW, wavelength has no special requirements, and by the straight line beam expander, the fan-shaped plan light beam is restrainted in the laser beam expansion;
(2) tested particle is modulated into the outstanding turbid body of solid-liquid when gas (Gu-be gasoloid) of volumetric concentration≤10%, the capacity of inserting is in≤300ml the measuring vessel, wall is provided with the incidence window and the shooting window of 60～110 ° of angles each other, and other position of wall is made light shield and handled;
(3) outstanding turbid body leaves standstill after evenly, and particle begins to do gravity settling, and planar laser beam shines in the container through incidence window simultaneously, makes the particle that is positioned on the planar light beam because of reflector laser, forms high light intensity motion picture point;
(4) adopt camera head or digital camera, the vision signal by shooting window acquisition laser-bounce picture point with commercially available video dynamic image process software, obtains the movement velocity of each picture point on vertical, is the gravity settling speed of particle;
(5) according to Stokes settling velocity law, when the density of density, liquid or the gas of particle and viscosity are determined, can calculate acquisition Stokes particle diameter by settling velocity, and be relative datum with the number or the volume of particle, meter is got all pairing relative percentages of Stokes particle diameter of measuring particle, promptly obtains grain graininess and distribution value.
The control of whole measuring process, video and Flame Image Process, and the calculating of granularity and distribution value, revise and to finish by computing machine.Application example of the present invention:
Tested powder: silit SiC; Density: 3210kg/m
3
Sedimentation medium: water (20 ℃ of temperature); Viscosity: 1.005 * 10
-3PaS; Density; 1000kg/m
3
Solid-liquid volumetric concentration: 5.5% (ultrasonic dispersing 3 minutes); Measuring vessel: 150ml glass cylinder;
Solid state laser: wavelength 532nm; Power: 5mw.
Silit SiC granularity that the present invention records and distribution value
| Sequence number | Settling velocity (μ m/s) | Granularity (μ m) | Granule number | Relative frequency (%) | Burden integration cloth (%) |
| ????1 | ????0.52~0.89 | ????0.66~0.86 | ????33 | ????9.12 | ????9.12 |
| ????2 | ????0.89~1.90 | ????0.86~1.26 | ????54 | ????14.92 | ????24.04 |
| ????3 | ????1.90~4.05 | ????1.26~1.84 | ????52 | ????14.36 | ????38.4 |
| ????4 | ????4.05~8.73 | ????1.84~2.70 | ????67 | ????18.51 | ????56.91 |
| ????5 | ????8.73~18.68 | ????2.70~3.95 | ????75 | ????20.72 | ????77.62 |
| ????6 | ????18.68~40.14 | ????3.95~5.79 | ????46 | ????12.71 | ????90.33 |
| ????7 | ????40.14~86.09 | ????5.79~8.48 | ????23 | ????6.35 | ????96.68 |
| ????8 | ????86.09~182.31 | ????8.48~12.34 | ????8 | ????2.21 | ????98.89 |
| ????9 | ????182.31~397.01 | ????12.34~18.21 | ????3 | ????0.83 | ????99.72 |
| ????10 | ????397.01~852.22 | ????18.21~26.68 | ????1 | ????0.28 | ????100 |
| Accumulation | ????362 | ????100 |
Claims (3)
1, decanter type laser-bounce picture point granulometry method, it is characterized in that laser beam expanding is become planar light beam, liquid-solid or the gas-solid mixing gravity settling system that irradiation is made up of tested particle, make the particle that is positioned on the planar light beam because of reflector laser, form high light intensity picture point, and then adopt shooting and video dynamic image to handle means, obtain the movement velocity of each picture point on vertical, be the settling velocity of particle, obtain and corresponding grain graininess of settling velocity and distribution value according to Stokes settling velocity law.
2, decanter type laser-bounce picture point granulometry method according to claim 1 is characterized in that concrete grammar is:
(1) adopt commercially available laser instrument as measurement light source, laser power 5～20mW, wavelength has no special requirements, and by the straight line beam expander, the fan-shaped plan light beam is restrainted in the laser beam expansion;
(2) tested particle is modulated into the outstanding turbid body of solid-liquid or the gasoloid of volumetric concentration≤10%, the capacity of inserting is in≤300ml the measuring vessel, and wall is provided with the incidence window and the shooting window of 60 ~ 110 ° of angles each other, and other position of wall is made light shield and handled;
(3) outstanding turbid body leaves standstill after evenly, and particle begins to do gravity settling, and planar laser beam shines in the container through incidence window simultaneously, makes the particle that is positioned on the planar light beam because of reflector laser, forms high light intensity motion picture point;
(4) adopt camera head or digital camera, the vision signal by shooting window acquisition laser-bounce picture point with commercially available video dynamic image process software, obtains the movement velocity of each picture point on vertical, is the gravity settling speed of particle;
(5) according to Stokes settling velocity law, when the density of density, liquid or the gas of particle and viscosity are determined, can calculate acquisition Stokes particle diameter by settling velocity, and be relative datum with the number or the volume of particle, meter is got all pairing relative percentages of Stokes particle diameter of measuring particle, promptly obtains grain graininess and distribution value.
3, decanter type laser-bounce picture point granulometry method according to claim 2 is characterized in that control, video and the Flame Image Process of whole measuring process, and the calculating of granularity and distribution value, revises and finish by computing machine.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03128257 CN1202412C (en) | 2003-07-01 | 2003-07-01 | Settling type laser reflection image point granularity measuring method |
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| CN 03128257 CN1202412C (en) | 2003-07-01 | 2003-07-01 | Settling type laser reflection image point granularity measuring method |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100432652C (en) * | 2004-09-29 | 2008-11-12 | 株式会社岛津制作所 | Particle size distribution device |
| CN101881719A (en) * | 2010-06-28 | 2010-11-10 | 中国科学院西安光学精密机械研究所 | Method for detecting gel particles in polyacrylonitrile polymer liquid |
| CN101607691B (en) * | 2009-07-14 | 2011-01-12 | 浙江大学 | Method for extracting nanoparticle from soil |
| CN103760073A (en) * | 2014-01-08 | 2014-04-30 | 大连理工大学 | Device and testing method for simulating indoor dust flying-off and settling property |
| CN104891565A (en) * | 2015-05-08 | 2015-09-09 | 重庆大学 | Method for detecting and controlling growth of metatitanic acid particles in on-line and real-time manner during sulfuric acid method-based titanium dioxide preparation process |
| CN105987866A (en) * | 2015-02-09 | 2016-10-05 | 中国科学院上海药物研究所 | Heterogeneous liquid settlement automatic-monitoring method and device |
| CN108519311A (en) * | 2018-03-07 | 2018-09-11 | 广州博冠光电科技股份有限公司 | A kind of smoke particle density real-time detection apparatus and method |
| CN108709836A (en) * | 2018-07-26 | 2018-10-26 | 宁夏大学 | Aerosol detection method and system |
| 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 |
| CN112577859A (en) * | 2020-12-02 | 2021-03-30 | 苏州海狸生物医学工程有限公司 | Experimental device and method for measuring basic physical parameters of magnetic microspheres |
-
2003
- 2003-07-01 CN CN 03128257 patent/CN1202412C/en not_active Expired - Fee Related
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100432652C (en) * | 2004-09-29 | 2008-11-12 | 株式会社岛津制作所 | Particle size distribution device |
| CN101607691B (en) * | 2009-07-14 | 2011-01-12 | 浙江大学 | Method for extracting nanoparticle from soil |
| CN101881719A (en) * | 2010-06-28 | 2010-11-10 | 中国科学院西安光学精密机械研究所 | Method for detecting gel particles in polyacrylonitrile polymer liquid |
| CN101881719B (en) * | 2010-06-28 | 2012-01-04 | 中国科学院西安光学精密机械研究所 | Method for detecting gel particles in polyacrylonitrile polymer liquid |
| CN103760073B (en) * | 2014-01-08 | 2015-10-28 | 大连理工大学 | The method of testing of the device of dust dispersion settling character in a kind of simulating chamber |
| CN103760073A (en) * | 2014-01-08 | 2014-04-30 | 大连理工大学 | Device and testing method for simulating indoor dust flying-off and settling property |
| CN105987866A (en) * | 2015-02-09 | 2016-10-05 | 中国科学院上海药物研究所 | Heterogeneous liquid settlement automatic-monitoring method and device |
| CN104891565A (en) * | 2015-05-08 | 2015-09-09 | 重庆大学 | Method for detecting and controlling growth of metatitanic acid particles in on-line and real-time manner during sulfuric acid method-based titanium dioxide preparation process |
| CN108519311A (en) * | 2018-03-07 | 2018-09-11 | 广州博冠光电科技股份有限公司 | A kind of smoke particle density real-time detection apparatus and method |
| 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 |
| CN108709836A (en) * | 2018-07-26 | 2018-10-26 | 宁夏大学 | Aerosol detection method and system |
| CN108709836B (en) * | 2018-07-26 | 2024-03-19 | 宁夏大学 | Aerosol detection method and system |
| CN112577859A (en) * | 2020-12-02 | 2021-03-30 | 苏州海狸生物医学工程有限公司 | Experimental device and method for measuring basic physical parameters of magnetic microspheres |
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| CN1202412C (en) | 2005-05-18 |
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