CN216309714U - Device for measuring content of ultra-large particles in particle material - Google Patents
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- CN216309714U CN216309714U CN202122186274.2U CN202122186274U CN216309714U CN 216309714 U CN216309714 U CN 216309714U CN 202122186274 U CN202122186274 U CN 202122186274U CN 216309714 U CN216309714 U CN 216309714U
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Abstract
The invention provides a device for measuring the content of ultra-large particles in a particle material, which is applied to the quantitative measurement of the content of the ultra-large particles in various powder materials, slurry and emulsion, and comprises a medium storage device, at least one lighting module and a counting module, injecting proper amount of pure medium into the medium container, then injecting proper amount of mixture of particles and medium, the particles in the particle separating tube moving under the comprehensive action of gravity, buoyancy and viscous force, if the density of the particles is greater than that of the medium, the particles will settle in the medium and float upwards on the contrary, the coarser the particles will necessarily settle or float at a greater speed, and when the particles pass through the measurement window, due to the irradiation of the parallel beam, and forming projection in the counting module, analyzing and counting, stopping measurement when the particle size of the particles passing through the measurement window is smaller than a preset particle size, and quantitatively obtaining the quantity and the particle size distribution of the ultra-large particles. The movement of the particles in the medium may also be accelerated by means of a centrifuge.
Description
Technical Field
The invention belongs to the technical field of particle detection, and particularly relates to a device for measuring the content of oversized particles in a particle material.
Background
Materials composed of particles, including powder materials, slurries, emulsions, and various types of particle suspensions, are common in many industries. Oversized particles refer to particles having a particle size greater than a specified upper limit in a sample of particulate material. In some industries, if oversized particles are present in the particulate material, serious consequences can be caused, for example, the oversized particles in the polishing material can scratch the surface of a workpiece, so that the workpiece is scrapped; in addition, for example, the ultra-large particles in the positive and negative grade materials for the power battery can pierce the battery diaphragm, causing the internal short circuit of the battery and concurrent heating and even burning. In practical industrial control, the oversized particles cannot be removed in an absolute sense, but the content of the oversized particles can only be controlled within an acceptable range, and the control is carried out on the premise that the content of the oversized particles in the material can be quantitatively measured.
The particulate matter (also referred to as "dispersed phase") that makes up the particulate material can be solid particles, liquid particles, and gas bubbles in a gas or liquid phase continuous medium.
The "upper limit particle size specification" herein is defined by the manufacturer or user of the particulate material according to the technical requirements of the industry. All industries that put forward this requirement on "particle size upper limit" theoretically require that there should be no particles in the particulate material that are larger than this upper limit, i.e. the ultra-large particles are zero. The proportion of ultra-large particles in the particulate material is therefore very low. The content of the ultra-large particles is generally PPM (10) if measured by taking the number of the particles as a statistical base-6) To PPT (10)-12) The magnitude of (A) and (B), which brings great trouble to the quantitative measurement of the content of the ultra-large particles. Typical prior art instruments for measuring the particle size distribution of micron-sized particle materials are laser particle sizers, sedimentation particle sizers, particle image processors, resistance (coulter) particle counters, photoresist particle counters, and the like. These instruments can be divided into two categories according to their working principle, one being based on the group effect of the particles, e.g. laser granulometersA sedimentation method particle size analyzer; the second is single particle counting measurements, such as particle image processors, resistive (coulter) particle counters. For a content of only 10-6～10-12The former has insufficient sensitivity and hardly responds to the ultra-large particle. The latter is due to the fact that the sample size measured at one time is too small (only 10 can be measured at one time)3To 105Individual particles), the measurement results are not representative. Although it is theoretically possible to compensate for the representative deficiency by extending the measurement time or increasing the number of measurements, the timeliness is too poor to be practical.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a device for measuring the content of ultra-large particles in a particle material, which is mainly used for solving the problem that the prior art is difficult to quantitatively measure the content of the ultra-large particles.
The invention provides a device for measuring the content of ultra-large particles in a particle material, which comprises a medium storage device, at least one lighting module and a counting module;
the medium storage device comprises a particle separating pipe, a measuring window and a collecting bottle, wherein the measuring window is respectively connected with the particle separating pipe and the collecting bottle in a sealing mode, the particle separating pipe is used for inputting injectant, the injectant comprises but is not limited to pure medium and a mixture containing particles and the medium, the particles in the mixture comprise main particles and super-large particles, and the particles move towards the direction of the collecting bottle according to the comprehensive stress of the particles in the medium;
the illumination module is used for emitting parallel light beams to the measuring window, and the parallel light beams are configured to penetrate through the measuring window and project to the counting module;
the counting module is used for sensing image information formed by irradiation of parallel light when the particles pass through the measuring window and analyzing and counting, and the number of the counting module is consistent with that of the illuminating module.
In some embodiments, the illumination module comprises a light source and a first lens disposed between the light source and the measurement window, the first lens for converting a diverging light beam emitted by the light source into a parallel light beam.
In some embodiments, the counting module includes an image sensor in signal connection with the processing unit, the image sensor is used for sensing image information generated by the particles in the measurement window area in the parallel light beams, and the processing unit is used for receiving the image information and performing analysis statistics.
In some embodiments, the counting module further comprises a second lens disposed between the image sensor and the measurement window, the second lens for imaging particles passing through the measurement window to the image sensor.
In some embodiments, the second lens is a telecentric lens.
In some embodiments, the two side glasses of the measuring window on the transmission path of the parallel light beams are flat glasses.
In some embodiments, the apparatus further comprises a centrifuge, the centrifuge is connected with the medium storage device and drives the medium storage device to rotate, and the centrifugal force direction formed by the rotation is divided into two cases: if the particle density is greater than the media density, directing centrifugal force from the particle separation tube toward the collection bottle; if the particle density is less than the media density, centrifugal force is directed from the collection bottle to the particle separation tube.
In some embodiments, the medium comprises a liquid and a gas, and the particles include, but are not limited to, solid particles, liquid phase particles, gas bubbles.
The invention has the beneficial effects that:
therefore, according to the embodiment of the present disclosure, a proper amount of pure medium is injected into the medium container, and then a proper amount of mixture is injected, because there is a size relationship between the density of the particles and the density of the medium, if the density of the particles is greater than the density of the medium, the particles will settle in the medium, otherwise, the particles will float upwards, and inevitably, the coarser particles settle or float upwards at a higher speed, and separation of the coarse particles from other particles is caused due to the difference of the moving speeds. Coarse particles pass through the measurement window before other particles. Due to the irradiation of the parallel light beams, the projection of the particles is formed in the counting module and is analyzed and counted, and the size of the coarse particle size and the number of the corresponding particle sizes can be obtained. The counting module counts the particles larger than the specified upper limit, namely the ultra-large particles, and can give the particle size distribution of the ultra-large particles. In order to save the measuring time, when the counting module obtains that the particles newly entering the measuring area are smaller than the preset particle size, the counting is stopped, and the super-large particle measuring process is finished. The measuring process consumes less time, is convenient to operate, and can quantitatively obtain the quantity and the particle size distribution of the ultra-large particles.
In order to accelerate the sedimentation or floating speed of the particles compared with the medium density, the centrifugal machine is used for driving the medium storage device to rotate, and the generated centrifugal force enables the ultra-large particles to be transferred from the particle separation pipe to the collection bottle more quickly so as to shorten the measurement time.
Drawings
The invention is further illustrated by means of the attached drawings, but the embodiments in the drawings do not constitute any limitation to the invention, and for a person skilled in the art, other drawings can be obtained on the basis of the following drawings without inventive effort.
FIG. 1 is a schematic overall view of an apparatus for measuring the level of ultra-large particles in a particulate material as disclosed herein.
FIG. 2 is a schematic illustration of an apparatus for measuring the level of ultra-large particles in a particulate material according to one embodiment of the present disclosure.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, when it is described that a specific device is located between a first device and a second device, there may or may not be an intervening device between the specific device and the first device or the second device. When a particular device is described as being coupled to other devices, that particular device may be directly coupled to the other devices without intervening devices or may be directly coupled to the other devices with intervening devices.
Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.
The applicant researches and discovers that:
typical instruments used in the prior art for measuring the particle size distribution of micron-sized particle materials are laser particle sizers, sedimentation particle sizers, particle image processors, resistance (coulter) particle counters, photoresist particle counters, and the like. These instruments can be broadly divided into two categories: population effect assays and single particle counting methods.
The laser particle analyzer and the sedimentation particle analyzer belong to the former method, the sampling amount is relatively large and is about between milligrams and grams, and the particle size distribution is analyzed by detecting a certain physical effect generated by particle groups when a particle sample passes through a measuring area. For example, a laser particle size analyzer, the information obtained by direct measurement is the sum of scattered optical field distributions generated by a plurality of particles with various sizes simultaneously, and then the particle size distribution is calculated by inversion through a computer algorithm. This method is not sensitive to low levels of particles having a size at either end of the main particle size. It is therefore insensitive to ultra-large particles. Although the laser particle sizer gives a measurement report that provides the largest particle number, it does not represent the true largest particle. Both theory and practice may prove that beyond its reported "maximum particle", there are often still non-negligible larger particles present.
The single particle counting method is represented by a resistance method and a particle image method, which are methods of measuring or calculating the size and the number of particles entering a measuring area one by one and finally counting the particle size distribution of a sample. The largest particle given by the method is the real largest particle entering the measuring region, but the number of particles which can be counted at one time is 103～105Of order of magnitude of 10 for a number content only-6～10-9The measurement of such instruments is far from representative for the ultra-large particles of (a). Although theoretically, accurate data of the ultra-large particles can be obtained by increasing the number of measurement times, the timeliness is poor, and the method is difficult to popularize and apply in practice.
The content of the particles is only 10% in a laser particle analyzer and a sedimentation particle analyzer, which are types of mass effect analysis, a particle image processor and a resistance method (coulter) particle counter, which are types of single particle counting method-6～10-9The ultra-large particles of (2) are either not sensitive enough or have too low timeliness, and can not meet the measurement requirement of related industries on the ultra-large particles in any case.
Limited to this, currently, all related industries evaluate whether the content of the ultra-large particles is qualified or not by simulating a trial effect. For example, the abrasives industry uses a standard workpiece made of bronze as the object to be abraded to test for the presence of ultra-large particles in the abrasive. This method is time consuming, laborious, highly random, and difficult to quantify. At present, no feasible method for measuring the ultra-large particles is provided in the power battery industry, and the problem of the ultra-large particles is seriously troubled. The quantitative measurement of the ultra-large particles is a long-standing and urgent problem to be solved in the existing particle material industry.
In view of the above, referring to fig. 1, in the present disclosure there is provided an apparatus for measuring the content of ultra-large particles in a particulate material, comprising a medium depository, at least one illumination module and a counting module;
the medium storage device comprises a particle separation tube 6, a measurement window 5 and a collection bottle 11, wherein the measurement window 5 is respectively connected with the particle separation tube 6 and the collection bottle 11 in a sealing manner, the interior of the measurement window is communicated with the interior of the collection bottle 11, the bottom end of the collection bottle 11 is closed, and the upper end of the separation tube 6 is opened. The particle separating tube 6 is used for inputting injectate, including but not limited to pure medium, mixture containing particles and medium, it is noted that pure medium does not represent the medium to be composed of a single substance completely, but means that it does not contain some specific particle or particles, so as to distinguish it from mixture containing particles and medium, the particles in the mixture include main particles 7 and super particles 12, the particles exceeding the preset particle size are defined as super particles 12, the rest of the particles not exceeding the preset particle size are defined as main particles 7, the particles move towards the collecting bottle 11 according to the comprehensive stress condition of the particles in the medium, the particles start to move from the particle separating tube 6, pass through the measuring window 5, and finally reach the collecting bottle 11, and the collecting bottle 11 is used for collecting the transferred particles;
the illumination module is used for emitting parallel light beams 4 to the measuring window 5, and the parallel light beams are configured to penetrate through the measuring window and project to the counting module;
the counting module is used for sensing the image information of the particles in the parallel light beam 4 and carrying out analysis and statistics, and the number of the counting module is consistent with that of the lighting module.
It should be noted that, the measurement window 5 is provided with a transparent channel, the two sides of the measurement window on the parallel light beam transmission path are made of flat glass, when particles pass through the measurement window 5, a part of light is blocked, so that a projection is generated in the counting module, and the counting module can capture and form corresponding image information and obtain desired data, such as the number and particle size distribution of the ultra-large particles 12, in response to the change of the projection; more specifically, when the mixture containing the particles and the medium is injected into the medium depositor, the mixture is first in the particle separating tube 6. The particles in the mixture can move in the medium storage device under the combined action of gravity, buoyancy and viscous force of the medium. If the density of the particles is greater than the density of the medium, the particles will settle in the medium; on the contrary, if the density of the particles is lower than that of the medium, the overall force of the particles is upward, and the inlet of the separation tube 6 is closed and the container is inverted. In any case, the particles will move from the separator tube 6 to the collector flask 11.
According to the stokes principle, in a medium, the coarser particles move faster, and the finer particles move slower. Over time, in the tube length distance of the particle separating tube 6, each particle is gradually separated according to the thickness degree of the particle, the thicker particles can quickly reach the area of the measuring window 5, corresponding image information is formed, through analysis and statistics, the particle size and the number of the particles with various sizes can be obtained, and the counting module does not count the particles which arrive relatively fine but with huge number in the later period. In this way, the number and size distribution of the oversized particles 12 can be obtained quantitatively within an acceptable time.
Therefore, by taking a certain amount of particulate material and dispersing the particulate material in a medium, the quantitative measurement method in the above embodiment can be used to measure the amount and particle size distribution of the ultra-large particles 12, and further know the content of the ultra-large particles 12 in the originally selected particulate material.
In this embodiment, the lighting module includes a light source 1 and a first lens 3, the first lens 3 is disposed between the light source 1 and the measurement window 5, the first lens 3 is configured to convert a divergent light beam 2 emitted by the light source 1 into a parallel light beam 4, the first lens 3 is a collimator lens, the direction of the divergent light beam 2 can be adjusted, it is ensured that the light beam passing through the measurement window 5 is the parallel light beam, and the measurement accuracy is improved.
In this embodiment, the counting module includes an image sensor 9 and a processing unit 10, the image sensor 9 is in signal connection with the processing unit 10, the image sensor 9 is used for sensing image information generated by particles in the region of the measurement window 5 under the irradiation of the parallel light beam 4, shadows formed by the particles in the parallel light beam 4 are projected onto the image sensor 9, the processing unit 10 is used for receiving the image information and performing analysis and statistics, and then calculating the particle size of the particles and the number of the particles with various sizes, and quantifying the number and the particle size distribution of the ultra-large particles 12.
Referring to fig. 2, as an embodiment, in order to reduce the edge blur of the particle projection caused by the non-ideal parallelism of the illumination light, the counting module further includes a second lens 13. The second lens 13 is arranged between the image sensor 9 and the measurement window 5 for imaging particles to the image sensor 9.
Preferably, the second lens 13 is a telecentric lens, so as to further reduce errors caused by different magnifications of particles with different object distances.
As an embodiment, in the case that the density of the particles is not much different from the density of the medium, or the upper limit of the particle diameter to be monitored is small, or the viscosity coefficient of the medium is large, the moving speed caused by the force of the particles in the gravitational field is too slow, and a centrifuge may be used, the centrifuge is connected with the medium storage device and drives the medium storage device to rotate, and the radial line of the rotating disc of the centrifuge is coincident with the axial line of the medium storage device, that is, the axial line of the medium storage device is on the radius of the rotating disc of the centrifuge. The centrifugal force generated by the rotation of the centrifuge disk is along the axis, and the direction of the centrifugal force generated by the rotation is divided into two cases: if the particle density is greater than the media density, directing centrifugal force from the particle separation tube toward the collection bottle; if the particle density is less than the media density, centrifugal force is directed from the collection bottle to the particle separation tube. The centrifugal force generated by the rotation of the centrifuge rotating disc can accelerate the movement speed of particles in the medium, in addition, the medium storage device, the illumination module and the counting module synchronously rotate, the relative position relation among the three parts can not change, the medium storage device, the illumination module and the counting module are also positioned in a centrifugal force field built by the centrifuge, the basic condition of measurement is ensured, the ultra-large particles 12 are more quickly transferred to the collecting bottle 11 under the action of the centrifugal force, and the corresponding image information is more quickly output.
Further, the medium includes liquid, gas, the particles include but are not limited to solid particles, liquid phase particles, gas bubbles, i.e. when the medium is in gas phase, the particles may be in solid phase or liquid phase; where the medium is a liquid phase, the particles may be solid particles, gas bubbles, or another immiscible liquid phase particle.
In a second aspect, the present invention also provides a method for measuring the content of ultra-large particles 12 in a medium, which is applied to an apparatus for measuring the content of ultra-large particles in a particulate material as in the above embodiment, comprising the steps of:
adjusting a parallel light beam 4 to directly irradiate the measuring window 5, wherein the parallel light beam 4 passes through a transparent channel of the measuring window 5 and finally hits the counting module;
injecting pure medium from the particle separating tube to make the liquid level of the pure medium slightly lower than the upper port of the separating tube, wherein the content of the pure medium is less than the total capacity of the medium storage device, the pure medium does not completely represent that the medium is composed of a single substance at the moment, but indicates that the medium does not contain a certain or some specific particles so as to distinguish the medium from a mixture containing the particles and the medium, and when the pure medium is injected, the liquid level of the pure medium is proper and does not occupy the total capacity of the medium storage device, and a certain residual capacity is reserved, and the distance from the particle separating tube 6 to the measuring window 5 is also ensured to be proper so as to facilitate the separation of the ultra-large particles 12 and the main particles 7;
mixing a proper amount of particles to be detected with a dispersion medium to form a mixture containing the particles and the medium, wherein the particles are fully dispersed in the dispersion medium to ensure that no agglomeration exists between the particles;
the mixture is injected from the upper end of the particle separating pipe 6 against the liquid surface of the pure medium, and it should be noted that if the ultra-large particles 12 do sedimentation movement in the medium, the particle separating pipe is positioned above, the collecting bottle 11 is positioned below, and the mixture is directly injected at the upper part of the particle separating pipe; if the oversized particles 12 float upwards in the medium, the input port of the particle separation pipe 6 needs to be sealed after the mixed liquid is injected, and then the medium storage device is inverted, so that the particle separation pipe 6 is positioned below, and the collection bottle 11 is positioned above;
the image information generated by the particles in the area of the measuring window 5 in the parallel light beam 4 is sensed and analyzed and counted.
After all the substances are injected, the particles and the medium exist in the medium storage device, in the medium, the particles originally positioned at the upper end of the particle separation tube 6 move towards the direction of the collection bottle 11 under the combined action of gravity, buoyancy and viscous force, the thicker particles move faster and the thinner particles move slower, each particle can be gradually separated according to the thickness degree in the tube length distance of the particle separation tube 6 along with the time, the thicker particles can quickly reach the area of the measurement window 5, corresponding image information is formed, the particle size and the number of the particles with various sizes can be obtained through analysis and statistics, and the number and the particle size distribution of the oversized particles 12 can be quantitatively obtained in reasonable time.
As an embodiment, when the diameter of the measured particle is smaller than a predetermined particle diameter, the measurement and statistics are stopped, and the predetermined particle diameter is determined according to the requirement, generally speaking, the predetermined particle diameter is equal to the upper limit particle diameter of the main particle 7, the particle diameter of the ultra-large particle 12 exceeds the predetermined particle diameter, and the particle diameter of the main particle 7 does not exceed the predetermined particle diameter, so as to quantitatively measure the content of the ultra-large particle 12 and effectively control the measurement time.
In one embodiment, the medium reservoir is integrated with a centrifuge, and the medium reservoir is controlled to rotate along with a rotating disk of the centrifuge. The radial line of the centrifuge rotor disk coincides with the axis of the medium reservoir, i.e. the axis of the medium reservoir lies on the radius of the centrifuge rotor disk, along which the centrifugal force generated when the centrifuge rotor disk is rotating is directed. The centrifugal force direction formed by the rotation is divided into two cases: if the particle density is greater than the media density, directing centrifugal force from the particle separation tube toward the collection bottle; if the particle density is less than the media density, centrifugal force is directed from the collection bottle to the particle separation tube. The centrifugal force generated by the rotation of the centrifuge rotating disc can accelerate the movement speed of particles in the medium, and aiming at the condition that the density of the oversized particles 12 is not much different from that of the medium, or the condition that the particle size of the oversized particles is small (such as 2 mu m) or the medium viscosity coefficient is large, the oversized particles 12 can be transferred to the collecting bottle 11 more quickly through the combination of the centrifuge rotating disc and the centrifuge, the corresponding image information is output more quickly, and the measurement of the oversized particles is completed more quickly.
Compared with the prior art, the invention provides a device for measuring the content of oversized particles in a particle material, wherein a proper amount of pure medium is injected into a medium storage device, then a proper amount of mixture of the particles and the medium is injected, because the size relationship exists between the particles and the density of the medium, if the density of the particles is larger than the density of the medium, the particles can be settled in the medium, otherwise, the particles float upwards, inevitably, the settling speed or the floating speed of the coarser particles is higher, because of the difference of the movement speed, when the coarse particles 8 pass through a measuring window 5, projections are formed in a counting module due to the irradiation of a parallel light beam 4, and are analyzed and counted, the particle size and the number of various sized particles can be obtained, the particles which are counted by the counting module and are larger than the specified upper limit are oversized particles, the particle size distribution of the oversized particles can be given, when the particles which newly enter a measuring area are smaller than the preset particle size, the counting is stopped, the process of measuring the ultra-large particles is finished, the accuracy of the measuring process is high, the operation is convenient, and the quantity and the particle size distribution of the ultra-large particles 12 can be obtained quantitatively.
In order to accelerate the sedimentation or floating speed of the particles, the centrifugal machine is used for driving the medium storage device to rotate so as to generate centrifugal force, so that the ultra-large particles 12 can be transferred from the particle separation tube 6 to the collection bottle 11 more quickly, and corresponding image information can be formed in the measurement window 5.
Finally, it should be emphasized that the present invention is not limited to the above-described embodiments, but only the preferred embodiments of the invention have been described above, and the present invention is not limited to the above-described embodiments, and any modifications, equivalent substitutions, improvements, etc. within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. The device for measuring the content of the super-large particles in the particle material is characterized by comprising a medium storage device, at least one lighting module and a counting module;
the medium storage device comprises a particle separating pipe, a measuring window and a collecting bottle, wherein the measuring window is respectively connected with the particle separating pipe and the collecting bottle in a sealing mode, the particle separating pipe is used for inputting injectant, the injectant comprises but is not limited to pure medium and a mixture containing particles and the medium, the particles in the mixture comprise main particles and super-large particles, and the particles move towards the direction of the collecting bottle according to the comprehensive stress of the particles in the medium;
the illumination module is used for emitting parallel light beams to the measuring window, and the parallel light beams are configured to penetrate through the measuring window and project to the counting module;
the counting module is used for sensing image information formed by irradiation of parallel light when the particles pass through the measuring window and analyzing and counting, and the number of the counting module is consistent with that of the illuminating module.
2. The apparatus of claim 1, wherein the illumination module comprises a light source and a first lens, the first lens is disposed between the light source and the measurement window, and the first lens is configured to convert a diverging beam from the light source into a parallel beam.
3. The apparatus according to claim 2, wherein the counting module comprises an image sensor and a processing unit, the image sensor is in signal connection with the processing unit, the image sensor is used for sensing image information generated by the particles in the measurement window region in the parallel light beam, and the processing unit is used for receiving the image information and performing analysis statistics.
4. The apparatus of claim 3, wherein the counting module further comprises a second lens disposed between the image sensor and the measurement window, the second lens configured to image the particles passing through the measurement window onto the image sensor.
5. The apparatus of claim 4, wherein said second lens is a telecentric lens.
6. An apparatus for measuring the content of ultra-large particles in a particulate material as claimed in any one of claims 1 to 5, wherein the glass of the measurement window on both sides of the transmission path of the parallel light beam is a plate glass.
7. The apparatus of claim 6, further comprising a centrifuge coupled to said media holder and configured to rotate said media holder, said rotation resulting in a centrifugal force in the direction of: directing the collection bottle from the particle separation tube if the particle density is greater than the media density; directing the particle separation tube from the collection bottle if the particle density is less than the media density.
8. The apparatus of claim 7, wherein said medium includes but is not limited to liquids, gases, and said particles include but are not limited to solid particles, liquid phase particles, gas bubbles.
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