CN202133598U - Particle size analyzer employing multi-method fusion - Google Patents
Particle size analyzer employing multi-method fusion Download PDFInfo
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- CN202133598U CN202133598U CN201120070350U CN201120070350U CN202133598U CN 202133598 U CN202133598 U CN 202133598U CN 201120070350 U CN201120070350 U CN 201120070350U CN 201120070350 U CN201120070350 U CN 201120070350U CN 202133598 U CN202133598 U CN 202133598U
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Abstract
The utility model discloses a particle size analyzer employing multi-method fusion, which is characterized in that the particle size analyzer is composed of a laser light source, a non-monochromatic illuminating light source, a micro-objective, a Dove prism or two 90-degree bending prisms or total reflection mirrors, semi-passing and semi-reflecting mirrors, a plane array digital camera or a video camera, a sample pool and a lens, so as to form two optical path structures, wherein one optical path irradiates the samples in the sample pool from the non-monochromatic illuminating light source, the micro-objective transmits an amplified picture to the plane array digital camera through the Dove prism and then the semi-passing and semi-reflecting mirrors; the other optical path irradiates the samples in the sample pool from the laser light source, the lens transmits the amplified picture to the plane array digital camera through the plane array digital camera. The beneficial effects of the utility model are that a plurality of measuring methods are fused by one digital camera, the measurement range of the particle size analyzer is enlarged by a simple structure, so the measurement range of the particle size analyzer ranges from nanoscale to hundreds of micrometers. The measurement requirement on wide particle size distribution is met, and the feature parameter is acquired through image method.
Description
Technical field
The utility model relates to the grain graininess measurement mechanism of a kind of fused images method and light scattering method, the grain graininess appearance that particularly a kind of measurement range can be from nanometer, sub-micron to micron.
Background technology
With the development of CCD and cmos digital camera, the image method grain graininess analyser that adopts digital camera to replace the eyepiece on the conventional microscope to constitute is used widely in recent years.Receive the restriction of optical microscope theoretical image resolution, the measurement lower limit of image method grain graininess appearance is generally more than 0.5 micron, and the upper limit can be confirmed according to the enlargement ratio of the microcobjective that uses.Dynamic light scattering grain graininess appearance is mainly used in the granulometry of nano particle, and the general measure lower limit is about 1 nanometer, and the upper limit is at the 3-5 micron.Though these 2 kinds of grain graininess appearance can satisfy the particle sizing in particle size range separately, to tens of during to hundreds of microns, 2 just can't meet the demands the particle size range of measuring particle at needs from nanometer.Static light scattering grain graininess appearance then is a scattered light intensity of measuring a large amount of particles; Do not consider that particle does the pulsation of the scattered light intensity that Brownian movement causes; Become the main method of present particle sizing based on the grain graininess appearance of static light scattering principle, measurement range can be from sub-micron to hundreds of microns.
Conventional images method grain graininess appearance is on microscope, to improve; With original eyepiece on CCD or cmos digital camera or the alternative microscope of digital camera; Particulate samples is placed on the microslide, and digital camera or digital camera photograph will be exported signal behind the micro-image of particle and deliver to computing machine and handle, and obtain the image of particle; Further obtain the size-grade distribution of particle, parameters such as shape with the grain graininess analysis software.When measuring different size particles, can use the object lens of different enlargement ratios with the rotary object lens mechanism on the microscope instead, but that luminous source system is still is same, does not change because of changing object lens.
Dynamic light scattering grain graininess appearance adopts laser to make light source, incides in the liquid (normally water) that contains tested particle, and molecule receives the bump of peripheral fluid molecule in liquid; Can produce Brownian movement, this Brownian movement at random makes the particle scattered intensity that random pulse also take place, and its ripple frequency is relevant with grain size; The random motion frequency of larger particles is lower; Diffusion motion speed is slower, and higher than the random motion frequency of granule, the diffusion motion rapid speed.The diffusion of particle and the relation of granularity can use the Stocks-Einstein formula to describe:
In the formula
D t Be coefficient of diffusion,
K B Be the graceful constant of bohr thatch,
TBe absolute temperature,
ηBe viscosity
, RIt is the radius of particle to be measured.
According to theory of Brownian motion, constantly the expectation value of the relative origin displacement of particle square is at
:
Therefore, if can record nano particle in process
Displacement after time just can obtain coefficient of diffusion
D t ,Use formula (1) to obtain tested particle grain size then
dTake continuously fast the Brownian movement image of particle scattered light particle, the random motion of particle under the analytic record just can be obtained the granularity of particle by the Stocks-Einstein formula.But when particle was big, Brownian movement was very little, can't detect, and also just can not measure the granularity of particle more in this way.It in this measuring method the continuous time series signal of measuring the dynamic scattering of particle.
Static light scattering grain graininess appearance adopts laser as light source equally, incides on the tested particle, and particle can produce light scattering, and this scattering can use Mie ' s light scattering theory to describe.Measure the space distribution of particle scattered light, use Mie ' s light scattering theory and inversion algorithm can obtain the granularity of tested particle then.What measure in the method is the static light scattering intensity relevant with grain size, does not relate to the dynamic effects that movement of particles produces the light scattering Strength Changes, so measuring-signal is not a time series signal.
Summary of the invention
The purpose of the utility model is in order to provide a kind of the image method grain graininess to be measured and light scattering method grain graininess measurement fusion grain graininess measuring instrument together, and this grain graininess appearance measurement range can satisfy various measurement requirement from nanometer to hundreds of microns.
The ultimate principle of the utility model: but with face battle array digital camera or video camera with the controlled and continuous coverage function of shutter speed, like CCD or cmos digital camera or digital camera as the detecting sensor part, when image method is measured; With miniature; Like light emitting diode, be arranged in the below of sample cell, as the light source of transmission beam method image measurement; Or be arranged in around the microcobjective; As the light source of reflectometry image measurement, face battle array digital camera or camera arrangements on the focal plane of microcobjective, composing images method grain graininess measuring instrument like this.
When dynamic light scattering measurement, as light source, laser beam is arranged lens from sample cell below incident on the sample cell with laser, and the Simulated dynamic scattering light signals of particle receives photographic images by face battle array digital camera or video camera.Can adopt two kinds of modes to write down the dynamic light scattering signal of particle, a kind of is the space distribution image of continuous recording multiframe particle scattered light, and the Brownian movement characteristic of analyzing the dynamic scattering luminous point of particle in these images then obtains the granularity of particle; Another kind is that the shutter speed of control figure camera makes the particle dynamic light scattering point in the two field picture that photographs become a trajectory; Track to all the grain optical scattering points in this two field picture carries out data processing; Obtain coefficient of diffusion by formula (2), obtain the granularity of particle then by formula (1).
When static light scattering is measured, light path arrangement and dynamic light scattering measurement with, but only the static light scattering characteristic of analysing particulates obtains the granularity of particle.
To the focal length of microcobjective and the focal length of lens in the light scattering measurement, aberration when design is considered in parametric synthesis such as aberration, can be combined into one with these two lens.
Based on the foregoing invention principle; The technical scheme of the utility model is: the grain graininess appearance that a kind of multi-method merges; It is characterized in that; This grain graininess appearance constitutes 180 degree synthetic two light channel structures of light path, semi-transparent semi-reflecting lens, face battle array digital camera or video camera, sample cell and lens combination of turning back by turn back prism or 2 completely reflecting mirrors of LASER Light Source, polyenergetic lighting source, microcobjective, Dove prism or 2 90 degree; One the tunnel is to be mapped to the sample the sample cell from the illumination that the polyenergetic lighting source sends; Sample cell is positioned on the sightingpiston of microcobjective, and microcobjective arrives face battle array digital camera or video camera behind the process semi-transparent semi-reflecting lens after enlarged image is passed through Dove prism again; Another road is that the illumination that LASER Light Source sends is mapped to the sample in the sample cell, and lens arrive face battle array digital camera or video camera after enlarged image is passed through semi-transparent semi-reflecting lens.
Described LASER Light Source is made up of first LASER Light Source and second LASER Light Source, and described first LASER Light Source becomes the vertical layout of 90 degree with second LASER Light Source.
Said second LASER Light Source and first LASER Light Source are arranged to 60 degree angles or 135 degree angles.
Said lighting source adopts light emitting diode or pea lamp.
Described battle array digital camera is CCD or cmos digital camera.
The beneficial effect of the utility model is to utilize same senser element-CCD or cmos digital camera that multiple measuring method is merged; Enlarged the granulometry bound of particle size analyzer with simple structure; Making can be from nanoscale to hundreds of micron order based on the measurement range of the particle size analyzer of the utility model; Satisfy the wide range of particle size distributions Testing requirement, and can provide the pattern parameter of particle simultaneously with image method.
Description of drawings
Fig. 1 is the utility model embodiment 1 synoptic diagram;
Fig. 2 is the utility model embodiment 2 synoptic diagram;
Fig. 3 is two LASER Light Source synoptic diagram among the utility model embodiment 2;
Fig. 4 is the utility model embodiment 3 synoptic diagram;
Fig. 5 is the utility model embodiment 4 synoptic diagram.
Embodiment
In conjunction with accompanying drawing the utility model is described further.
Embodiment 1:
The grain graininess appearance that a kind of multi-method merges; By shown in Figure 1; This grain graininess appearance is combined into two light channel structures by first LASER Light Source 1, first lighting source 2, second lighting source 3, microcobjective 4, Dove prism 5, semi-transparent semi-reflecting lens 6, face battle array digital camera or video camera 7, sample cell 8 and lens 9; One the tunnel is to be mapped to the sample the sample cell 8 from the illumination that first lighting source 2 sends; Sample cell 8 is positioned on the sightingpiston of microcobjective 4, and microcobjective 4 arrives face battle array digital camera or video camera 7 through semi-transparent semi-reflecting lens 6 backs after enlarged image is passed through Dove prism 5 again; Another road is that the illumination that first LASER Light Source 1 sends is mapped to the sample in the sample cell 8; Lens 9 with enlarged image through semi-transparent semi-reflecting lens 6 back to face battle array digital camera or video cameras 7, face battle array digital camera or video camera 7 become electric signal to send into computing machine image transitions to handle the size-grade distribution that obtains particle.
The utility model places first lighting source 2 under the sample cell 8 luminous when measuring with image method, and second lighting source 3 that is arranged in around the microcobjective is not luminous, as the transmission beam method image measurement; Place first lighting source 2 under the sample cell 8 not luminous, second lighting source 3 that is arranged in around the microcobjective is luminous as the reflectometry image measurement; Said first lighting source 2 and second lighting source 3 all adopt light emitting diode or pea lamp; It also can be other light sources; When needs are observed or are measured tested particle surface characteristic and pattern; Second lighting source 3 illuminates sample particle from the oblique upper or the top of sample; Microcobjective with enlarged image through Dove prism 5 and semi-transparent semi-reflecting lens 6 backs to face battle array digital camera or video cameras 7, face battle array digital camera or video camera 7 become electric signal to send into computing machine image transitions to handle character of surface and the pattern information that obtains particle.
The utility model is when measuring with dynamic light scattering method; The sample particle of the laser beam irradiation that sends by first LASER Light Source 1 in the sample cell 8; The forward direction dynamic scattering light of particle is received by lens 9 after semi-transparent semi-reflecting lens 6 arrives face battle array digital camera or video camera 7, the dynamic light scattering signal of face battle array digital camera or video camera 7 continuous recording particles, and send into computing machine; Theory of Brownian motion and Stocks-Einstein formula according to particle are handled, and obtain the size-grade distribution of particle; Or the shutter speed
of control camera; Make on the image photograph because the movement locus line of the scattering luminous point that particle causes because of Brownian movement appears in time exposure; Rather than luminous point; Send into computing machine then; Theory of Brownian motion and Stocks-Einstein formula according to particle are handled, and obtain the size-grade distribution of particle;
The utility model is when measuring with the static light scattering method; The sample particle of the laser beam irradiation that sends by first LASER Light Source 1 in the sample cell 8; The static scattered light of the forward direction of particle is received by lens 9 after semi-transparent semi-reflecting lens 6 arrives face battle array digital camera or video camera 7; Face battle array digital camera or video camera 7 are sent the static scattered signal of the particle that records into computing machine, handle according to Mie ' s light scattering theory, obtain the size-grade distribution of particle.
Embodiment 2:
In embodiment 1, static light scattering and dynamic light scattering measurement all be forward scattering light.Because dynamic light scattering is to measure nanoscale to submicron particles; The dynamic scattering light intensity of these molecules relatively very a little less than; But the scattered light intensity in all directions is more even, and the environment parasitic light can produce very big noise to the dynamic scattering light of these molecules.And the forward scattering light of micron particles is stronger, the lateral scattering light intensity relatively a little less than, measure the interference be not subject to the environment parasitic light at forward direction.For addressing this problem, embodiment 2 is proposed, by shown in Figure 2.
Different with embodiment 1 is in the present embodiment dynamic light scattering and static light scattering measure and adopt two LASER Light Sources respectively: first LASER Light Source 1 and second LASER Light Source 10, by Fig. 2, shown in Figure 3.When dynamic light scattering measurement; The particle of the laser beam irradiation that second LASER Light Source 10 sends in the sample cell 8; The particle dynamic light scattering clock signal quilt cover battle array digital camera 7 of side direction 90 degree directions is taken record; Can avoid the interference of the very strong forward direction parasitic light of laser beam like this, improve the signal to noise ratio (S/N ratio) of dynamic light scattering measurement signal.And the particle of the laser beam irradiation that first LASER Light Source 1 sends when static light scattering is measured in the sample cell 8, the forward direction static light scattering signal quilt cover battle array digital camera 7 of particle is taken records.Fig. 3 has represented that static light scattering is measured with first LASER Light Source 1 and the layout of dynamic light scattering measurement with second LASER Light Source 10 in the present embodiment, the vertical layout of 10 one-tenth 90 degree of first LASER Light Source 1 and second LASER Light Source.Wherein dynamic light scattering measurement also can be arranged in different angles with second LASER Light Source 10, and second LASER Light Source 10 and first LASER Light Source 1 are arranged to less than 180 degree, greater than 0 degree.
Embodiment 3:
Adopting static light scattering to measure larger particles, during like hundreds of micron particles, the focal length of the lens 9 among the embodiment 1 needs long, and the instrument size that constitutes like this is longer.For reducing the size of instrument, in the present embodiment, the position of the Dove prism among the embodiment 15 is changed, as shown in Figure 4.Image method directly arrives face battle array digital camera or video camera 7 through microcobjective 4 enlarged images in measuring behind semi-transparent semi-reflecting lens 6.After being received by lens 9, dynamic scattering light in the light scattering measurement or static scattered light arrive face battle array digital camera or video camera 7 through passing through semi-transparent semi-reflecting lens 6 behind the Dove prism 5 again.
In the present embodiment also can be as among the embodiment 2 dynamic light scattering measurement and static light scattering measure and adopt 2 LASER Light Sources to be arranged at an angle of 90 respectively, to reduce the interference that parasitic light is measured the side direction scattered light.
Embodiment 4:
Adopted Dove prism to change the round of light in the above-described embodiments, but large-sized Dove prism cost is very high, can adopts lower-cost 2 the 90 degree prism 5 of turning back to replace Dove prism to change the round of light, shown in Fig. 5.Spending the prism of turning back for these 2 90 also can use 2 completely reflecting mirror to replace.
Three kinds of shared sample cells of measuring method and a face battle array digital camera in the above-described embodiments.The static light scattering method is measured and dynamic light scattering method is measured also shared same set of measuring system, and just measuring method is different, and described battle array digital camera is CCD or cmos digital camera.
Claims (4)
1. the grain graininess appearance that merges of a multi-method; It is characterized in that; This grain graininess appearance constitutes 180 degree synthetic two light channel structures of light path, semi-transparent semi-reflecting lens, face battle array digital camera or video camera, sample cell and lens combination of turning back by turn back prism or 2 completely reflecting mirrors of LASER Light Source, polyenergetic lighting source, microcobjective, Dove prism or 2 90 degree; One the tunnel is to be mapped to the sample the sample cell from the illumination that the polyenergetic lighting source sends; Sample cell is positioned on the sightingpiston of microcobjective, and microcobjective arrives face battle array digital camera or video camera behind the process semi-transparent semi-reflecting lens after enlarged image is passed through Dove prism again; Another road is that the illumination that LASER Light Source sends is mapped to the sample in the sample cell, and lens arrive face battle array digital camera or video camera after enlarged image is passed through semi-transparent semi-reflecting lens.
2. the grain graininess appearance that multi-method according to claim 1 merges; It is characterized in that; Described LASER Light Source is made up of first LASER Light Source and second LASER Light Source, and the angle between described first LASER Light Source and second LASER Light Source is arranged to less than 180 degree, greater than 0 degree.
3. the grain graininess appearance that multi-method according to claim 1 merges is characterized in that, said polyenergetic lighting source adopts light emitting diode or pea lamp.
4. the grain graininess appearance that multi-method according to claim 1 merges is characterized in that described battle array digital camera is CCD or cmos digital camera.
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| CN201120070350U CN202133598U (en) | 2011-03-17 | 2011-03-17 | Particle size analyzer employing multi-method fusion |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105424558A (en) * | 2015-11-03 | 2016-03-23 | 上海理工大学 | Combustion particle multi-parameter measurement device and method adopting blue-ray back lighting |
| CN109167911A (en) * | 2018-09-03 | 2019-01-08 | 歌尔股份有限公司 | Image acquiring device, method and apparatus |
-
2011
- 2011-03-17 CN CN201120070350U patent/CN202133598U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105424558A (en) * | 2015-11-03 | 2016-03-23 | 上海理工大学 | Combustion particle multi-parameter measurement device and method adopting blue-ray back lighting |
| CN105424558B (en) * | 2015-11-03 | 2018-05-22 | 上海理工大学 | A kind of burning particles multiparameter measuring device and method using blue light back lighting |
| CN109167911A (en) * | 2018-09-03 | 2019-01-08 | 歌尔股份有限公司 | Image acquiring device, method and apparatus |
| CN109167911B (en) * | 2018-09-03 | 2020-12-04 | 歌尔光学科技有限公司 | Image acquisition device, method and equipment |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120201 Termination date: 20130317 |