CN112255150B - Laser particle analyzer for realizing omnibearing measurement and measurement method - Google Patents
Laser particle analyzer for realizing omnibearing measurement and measurement method Download PDFInfo
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- CN112255150B CN112255150B CN202011091772.2A CN202011091772A CN112255150B CN 112255150 B CN112255150 B CN 112255150B CN 202011091772 A CN202011091772 A CN 202011091772A CN 112255150 B CN112255150 B CN 112255150B
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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
- G01N15/0211—Investigating a scatter or diffraction pattern
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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
- G01N2015/0238—Single particle scatter
Abstract
The laser particle analyzer comprises a rotary laser transmitting receiver and a sample pool, wherein the rotary laser transmitting receiver can be rotatably arranged on the periphery of the sample pool by taking the sample pool as a rotation center, the rotary laser transmitting receiver comprises a rotating device and a measuring device arranged on the rotating device, and the measuring device is used for transmitting laser signals to the sample pool and detecting echo signals. The laser particle analyzer and the measuring method thereof can realize continuous seamless reception of 0-180-degree scattered light, and further expand the lower limit of the laser particle analyzer. The measurement result is in good agreement with the nominal value, and the lower measurement limit is close to the theoretical limit of the static light scattering method. And the size problem of irregular particles under different angles is measured by adopting a rotary laser transmitting and receiving device to carry out multi-angle measurement.
Description
Technical Field
The disclosure relates to the technical field of laser particle sizer correlation, in particular to a laser particle sizer and a measuring method for achieving all-dimensional measurement.
Background
The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.
The laser particle analyzer utilizes the diffraction effect of light generated by irradiating laser on micro powder particles, the change of laser diffraction angle is brought by the size difference of the particles, and the change of the size of diffraction light ring is reflected on a detector. The granularity is analyzed according to the size of the halo, and the size of a certain granularity is judged according to the intensity of the halo. And then, performing fitting approximate analysis by the computer according to the size of the diffraction light ring and the intensity of the light according to a preset mathematical relationship to obtain a granularity composition analysis result of the sample. With the development of scientific research and industrial production, the requirement for measuring nano-particles is more and more, and the method has the remarkable advantages of wide measurement range, good repeatability, high speed, accurate and stable median particle size analysis result, easy operation and the like, and is very suitable for the biomedical preparation industry. Especially widely applied to microsphere analysis, powder aerosol quality research, liposome particle size and distribution inspection, emulsion microparticle analysis, preparation intermediates, raw material medicines, auxiliary materials, traditional Chinese medicine powder particle size and the like.
The application of the laser particle size analyzer is more and more extensive, and the requirement on the laser particle size analyzer is more and more high, and the inventor finds that the traditional laser particle size analyzer is used for particle size analysis, the measurement direction is single, the size of an angle can be obtained for irregular particles, the particles, particularly nano particles, cannot be accurately and comprehensively analyzed, and the change of the particle size composition cannot be effectively and accurately reflected. The smaller the particle size, the larger the scattering angle, and the measurement range of the scattering angle must be expanded for the particle size measurement of small particles, the lower limit of the measurement of the current laser particle size analyzer is limited, and the measured particle size cannot meet the measurement of small particles.
Disclosure of Invention
In order to solve the problems, the disclosure provides a laser particle analyzer for realizing all-dimensional measurement and a measurement method, wherein a rotary laser transmitting and receiving device and an annular sample pool are arranged, so that all-dimensional measurement of particles can be realized, and the measurement lower limit of the laser particle analyzer is further expanded.
In order to achieve the purpose, the following technical scheme is adopted in the disclosure:
one or more embodiments provide a laser particle analyzer for realizing all-round measurement, including rotatory laser emission receiver and sample cell, rotatory laser emission receiver uses the sample cell to set up in the periphery of sample cell as the rotation center is rotatable, and rotatory laser emission receiver includes rotary device and the measuring device who sets up on rotary device, and measuring device is used for launching laser signal and detecting echo signal to the sample cell.
One or more embodiments provide a particle size measuring method based on the above laser particle size analyzer for realizing all-directional measurement, including the following steps:
the center position of the correction sample cell is positioned on the rotation center of the rotary laser transmitting and receiving device, and the laser, the lens, the pinhole, the plano-convex cylindrical lens, the central hole of the main detector and the main detector are positioned on the same optical axis passing through the center of the sample cell;
setting the rotation angle of the rotating laser transmitting receiver, and controlling a laser to transmit laser signals at different angles;
and receiving the echo signals scattered by the sample particles, and analyzing the particle size distribution of the sample to be detected according to the echo signals.
Compared with the prior art, the beneficial effect of this disclosure is:
the laser particle analyzer and the measuring method thereof can realize continuous seamless reception of 0-180-degree scattered light, and further expand the lower limit of the laser particle analyzer. The measurement result is in good agreement with the nominal value, and the lower measurement limit is close to the theoretical limit of the static light scattering method. And the size problem of irregular particles under different angles is measured by adopting a rotary laser transmitting and receiving device to carry out multi-angle measurement.
According to the annular sample cell, the sample cell is arranged to be the annular sample cell, light scattered by particles deviates from the original propagation direction, is emitted out of the wall of the annular glass cell of the sample cell and is received by the arranged large-angle detector, and compared with a traditional sample cell, the annular sample cell has a wider scattering angle receiving range, and has a smaller lower measurement limit and higher small particle measurement sensitivity. The annular sampling cell has the same effect no matter from which angle the laser is incident into, compared with other methods for expanding scattering angles, the annular sampling cell method can emit scattered light from the cell wall in a range of 0-180 degrees theoretically, the influence of total reflection in the traditional method is ingeniously avoided, the problem of data splicing of different illumination light beams is solved, the problem of mutual interference among the scattered light emitted from different emitting surfaces is solved, and the structure is very simple.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure and not to limit the disclosure.
FIG. 1 is a schematic structural view of a laser particle sizer of embodiment 1 of the present disclosure;
FIG. 2 is a schematic diagram of the propagation of horizontal incident light and refracted light of a center particle in an annular sample cell according to example 1 of the present disclosure;
FIG. 3 is a schematic illustration of the propagation of light scattered by non-central particles within an annular sample cell according to example 1 of the present disclosure;
FIG. 4 is a graph of light energy distribution for a typical particle size;
FIG. 5 is a graph showing the variation of root mean square error with particle size for the optical energy distributions of a conventional particle sizer and the particle sizer of the present disclosure under vertically polarized light;
among them, 1-laser; 2-a lens; 3-pinhole; 4-plano-convex cylindrical lens; 5-a sample cell; 6-sample cell center; 7-main probe centre hole; 8-a main detector; 9-a large angle detector; 10-rotating laser transmitter receiver.
The specific implementation mode is as follows:
the present disclosure is further described with reference to the following drawings and examples.
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present disclosure. As used herein, the singular is intended to include the plural unless the context clearly dictates otherwise, and it should be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of features, steps, operations, elements, components, and/or combinations thereof. It should be noted that, in the present disclosure, various embodiments and features of the embodiments may be combined with each other without conflict. The embodiments will be described in detail below with reference to the accompanying drawings.
Example 1
In one or more embodiments, as shown in fig. 1 to 5, a laser particle analyzer for realizing omnidirectional measurement includes a rotating laser transceiver and a sample cell, the rotating laser transceiver is rotatably disposed around the sample cell with the sample cell as a rotation center, the rotating laser transceiver includes a rotating device and a measuring device disposed on the rotating device, and the measuring device is configured to transmit a laser signal to the sample cell and detect an echo signal.
The echo signal comprises a scattered light signal of the transmitted laser signal after scattering by a sample of the sample cell.
This embodiment is through setting up rotatory laser emission receiver, and rotatory laser emission receiver encircles the sample cell setting, and through the transmitting laser and the receipt echo signal that rotary device can the multi-angle, transmitting laser realizes the all-round measurement to the sample particle of sample cell by the particle scattering of sample cell. The particle size in the sample pool is measured at multiple angles, the size of all-round particles can be obtained, the accuracy of particle size measurement, especially irregular particle size measurement, is improved, the measurement lower limit of a laser particle analyzer is further expanded, and the measurement lower limit is close to the theoretical limit of a static light scattering method.
In some embodiments, the measuring device of the rotating laser transmitter-receiver comprises a laser 1, a lens 2, a pinhole 3, a plano-convex cylindrical lens 4, a main detector central hole 7, a main detector 8 and a large angle detector 9, wherein the laser 1, the lens 2, the pinhole 3, the plano-convex cylindrical lens 4, the main detector central hole 7 and the main detector 8 are arranged on the same optical axis, the optical axis passes through the center of the sample cell, and the large angle detector 9 is arranged in a ring shape by taking the sample cell 5 as the center.
Optionally, the distance from the pinhole 3 to the center of the sample cell is equal to the distance from the central hole 7 of the main detector to the center of the sample cell.
Optionally, the number of the large-angle detectors of the rotating laser transmitter-receiver is multiple.
As a further technical scheme, a plurality of large-angle detectors of the rotary laser transmitting and receiving device are distributed on the same circle with the center of the annular sample cell as a circular point, and the radius is the distance from the pinhole 3 to the center of the sample cell 5.
The sample cell of this embodiment sets up at the circle center that wide-angle detector, main detector constitute, can make the sample cell be located the measurement center, is convenient for measure the scattering angle to the particle that is the same for position size at the difference, the scattering angle is the same, can appear the diffuse spot, the sample cell does not probably influence the imaging effect of diffuse spot on the circle center, the imaging effect of diffuse spot can be improved in setting up of this embodiment sample cell.
As a possible embodiment, the measuring device is mounted on the rotating device by means of a bracket which is fastened to the quasi-toroidal or toroidal support.
As another possible configuration, the measuring device is arranged on the rotating device by being fixed to a quasi-semi-annular or annular housing. The shell position that measuring device launches laser and receives echo signal sets up the through-hole for avoid sheltering from of light.
Optionally, the rotating device of the rotating laser transmitter-receiver can be set to rotate by 0-180 °. The rotary laser emitting receiver is an instrument surrounding the center of the annular sample cell, the size of particles in the sample cell can be measured by rotating 1 degree every time, and the size of all-round particles can be obtained finally, so that the specific size of irregular particles can be obtained.
The rotary device can be driven to rotate by a motor.
The conventional sample cell consists of two parallel flat glasses, and the particles to be measured are suspended between the two glasses. As most of the suspension media are liquid, the refractive index of the liquid is larger than that of air, when the scattering angle is larger than a certain range, the scattering light cannot be emitted into the air due to the action of total reflection, so that the measurement capability of the instrument on submicron particles is limited, the smaller the tested particles are, the larger the scattering angle is, in order to expand the lower measurement limit of the laser particle analyzer, the measurement range of the scattering angle must be expanded, and the measurement range of the analyzer is limited by the structure of the existing sample cell.
As a further improvement, in order to realize the capture of scattered light signals, the sample cell is of an annular structure, and is a transparent ring column of a cylindrical structure, and comprises two layers of annular transparent cell walls, a cylindrical inner cavity in the middle is used for placing a sample to be detected, and the transparent cell walls and the liquid column in the cell form a lens group.
Alternatively, the transparent cell walls may be of glass material.
The transparent cell wall of the annular sample cell and the liquid column in the cell form a lens group. The center of the pinhole and the center of the primary detector are in an object-image relationship with respect to the lens group.
As shown in fig. 1, in a top view of the laser particle analyzer of the present embodiment, the lens group has focusing power in the horizontal direction but does not have focusing power in the vertical direction, and in order to achieve the focusing power in the vertical direction, a plano-convex cylindrical lens 4 is added in front of the lens group, so that the pinhole 3 and the central hole 8 of the main detector are also in an object image relationship with respect to the plano-convex cylindrical lens.
In the embodiment, the sample cell is set to be an annular sample cell, light scattered by particles deviates from the original propagation direction, is emitted from the wall of the annular glass cell of the sample cell, and is received by the arranged large-angle detector 9, and compared with the traditional sample cell, the annular sample cell has a wider scattering angle receiving range and theoretically smaller measurement lower limit and higher small particle measurement sensitivity. The annular sampling cell has the same effect no matter from which angle the laser is incident into, compared with other methods for expanding scattering angles, the annular sampling cell method can emit scattered light from the cell wall in a range of 0-180 degrees theoretically, the influence of total reflection in the traditional method is ingeniously avoided, the problem of data splicing of different illumination light beams is solved, the problem of mutual interference among the scattered light emitted from different emitting surfaces is solved, and the structure is very simple.
Example 2
Based on the laser particle analyzer of embodiment 1, this embodiment provides a particle size measuring method of a laser particle analyzer for implementing omnidirectional measurement based on embodiment 1, including the following steps:
step 1: the center position of the correction sample cell is positioned on the rotation center of the rotation laser transmitting receiver, and the laser 1, the lens 2, the pinhole 3, the plano-convex cylindrical lens 4, the center hole 7 of the main detector and the main detector 8 are positioned on the same optical axis passing through the center of the sample cell;
and 3, receiving the echo signals scattered by the sample particles, and analyzing the particle size distribution of the sample to be detected according to the echo signals.
The echo signal comprises a scattered light signal of the transmitted laser signal after scattering by a sample of the sample cell.
This embodiment is located rotatory laser emission receiver's rotation center through setting for sample cell central point and puts, can make rotatory laser emission receiver measure the particle size distribution of the sample that awaits measuring with a plurality of different angles, has improved the measuring degree of accuracy of granule especially irregular granule size, and then has expanded the measurement lower limit of laser particle sizer.
In step 2, the rotation angle of the rotating laser transmitter-receiver is set, and the method for controlling the laser 1 to transmit the laser signal at different angles may be specifically, the set value of the rotation angle is set, and the rotation angle of the set rotation value is measured every time the set rotation angle is measured until the rotation angle reaches 180 degrees, so that the measurement is completed. As in the present embodiment, the rotation angle may be set to 1 °, and 180 measurements may be performed from 0 °.
The measurement process and the measurement principle are as follows:
the laser emits a beam of laser, after being focused by the lens and filtered by the pinhole, the laser irradiates the annular sample cell through the plano-convex cylindrical lens, passes through the cell wall and then irradiates the particles in the cell. One part of the illumination light is scattered by the particles, and the other part of the illumination light continues to propagate in the original propagation direction, passes through the ring glass again, is focused on the central hole of the main detector, passes through the central hole and then irradiates the main detector 8. The distance from the pinhole to the center of the sample pool is equal to the distance from the central hole of the main detector to the center of the sample pool. The light scattered by the particles deviates from the original propagation direction, exits from the annular glass cell wall of the sample cell, passes through the cell wall and then irradiates each unit of the main detector and the large-angle detector. The units of the large-angle detector, the center of the main detector and the center of the pinhole are positioned on a circumference (hereinafter referred to as a circular focal plane) taking the center of the sample cell as the center of a circle. The laser transmitter-receiver is then rotated by 1 ° for the next measurement.
Fig. 2 is a schematic diagram showing the propagation of horizontally incident and scattered light inside the sample cell. Since the pinhole 3 is located at the focal point of the lens group, when the incident beam reaches the inside of the sample cell, it is close to parallel light, and due to the focusing action of the plano-convex cylindrical lens, it is convergent light in the direction perpendicular to the view of the figure. Meanwhile, the cross section of the sample cell is circular, scattered light of any angle emitted by the central particles of the sample cell enters the cell wall at a perpendicular angle, and the incident angle of the scattered light of any angle emitted by the central particles of the sample cell is 0 DEG, so that light rays directly enter the air.
The scattered light propagation of particles elsewhere in the sample cell is shown in fig. 3. For the scattered light with the scattering angle theta, the incident light parallel to the paper surface in the sample cell is parallel light, so the scattered light of the particles at different positions is also parallel light in the direction parallel to the paper surface. Due to the circular symmetry of the sample cell, scattered light with the same scattering angle is equivalent to a diverging illumination beam from a virtual S' point on the circular focal plane. Due to the focusing effect of the annular sample cell, under ideal conditions, scattered light with the same scattering angle at different positions is inevitably focused at the intersection point of the central light beam and the circular focal plane, but due to the existence of spherical aberration, the focusing point is a scattered spot, and the size of the scattered spot and the spherical aberration are in a linear relationship.
The spherical aberration δ L' is a function of the incident height h, and neglecting spherical aberrations of more than two levels, can be expressed as:
δL′＝A1h2+A2h4 (1)
in the formula A1，A2The primary spherical aberration coefficient and the secondary spherical aberration coefficient are respectively.
For a scattered ray with a scattering angle theta of a particle at different positions, the incident height can be expressed as:
h2＝R′sinθ (2)
wherein R' is the radius of the inner ring of the annular sample cell. As can be seen from the expressions (1) and (2), the closer the scattering angle is to 90 °, the larger the spherical aberration is, the poorer the focusing performance of the scattered light of the same scattering angle emitted from the particles at different positions in the sample cell is. Because the large-angle scattered light corresponds to small particles, the scattered light intensity changes slowly along with the angle, the area of the adopted large-angle detector is large, and the detection precision of scattered light energy distribution cannot be influenced by slightly poor focusing of the scattered light near 90 degrees. For small angles of scattered light, the scattered light can be received using a conventional annular or fan detector, with the upper measurement limit depending on the size of the unscattered illumination beam focal point diffuse spot.
To illustrate the effect of the measurement method of this example, a comparative test was performed in which the distribution of scattered light energy of particles was compared between a conventional laser particle size analyzer and the laser particle size analyzer of this example.
According to the mie scattering theory, the smaller the particle diameter is, the more symmetrical the spatial scattering light intensity distribution is, and the less obvious the variation of the scattering light intensity is. The light energy distribution corresponding to any spherical particle can be calculated.
Fig. 5 shows the light energy distribution corresponding to the irradiation of the vertically polarized light when the relative refractive index m is 1.2 and the dimensionless parameter α is 1.98, 1.32, 0.66, 0.33, 0.132, 0.0001, and in this embodiment, when the wavelength of the incident light is 633nm and the dispersion medium is water, the particle diameters D are 300, 200, 100, 50, 20, and 0.015nm, respectively.
The dimensionless parameter α ═ π D/λ, where D is the particle diameter π ═ 3.14 and λ is the wavelength of the light of the dispersion medium.
The particle size is considered to be infinitesimal when the dimensionless parameter α is 0.0001. From the light energy distribution, it is considered that discrimination is possible if particles can be distinguished from infinitely small particles. As can be seen from fig. 5, when the dimensionless parameter α is 1.32, 0.66, 0.33, 0.132, respectively, the difference between the light energy distribution and the light energy distribution before the total reflection angle of 48.8 ° when the dimensionless parameter α is 0.0001 is very small, and thus the conventional cuvette cannot substantially distinguish the sizes of particles; the annular sample cell can smoothly receive scattered light of 0-180 degrees, the scattered light energy distribution when the dimensionless parameter alpha is 1.32, 0.66 and 0.33 has certain difference with that when the dimensionless parameter alpha is 0.0001, and the particles can be basically distinguished under lower noise level.
Quantification of optical energy distribution E corresponding to two particle sizes using root mean square error1，E2A difference of (a) that
In the formula E1，E2Normalization has been performed. For ease of discussion, the optical energy distribution is specifically referred to as a normalized optical energy distribution. Fig. 5 shows the variation trend of the root mean square error of the light energy distribution of the conventional particle sizer and the particle sizer of the present disclosure with the particle size under the irradiation of the vertical polarized light when the relative refractive index m is 1.2 and the dimensionless parameter α is 0.0001. As can be seen from fig. 5, for the conventional sample cell, the root mean square error of the corresponding particle size and infinitesimal optical energy distribution is much smaller than that of the circular sample cell at the position of the small particle, which indicates that the conventional laser particle size analyzer has poor resolution capability for the small particle and is very susceptible to noise interference when measuring the small particle.
The above description is only a preferred embodiment of the present disclosure and is not intended to limit the present disclosure, and various modifications and changes may be made to the present disclosure by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present disclosure should be included in the protection scope of the present disclosure.
Although the present disclosure has been described with reference to specific embodiments, it should be understood that the scope of the present disclosure is not limited thereto, and those skilled in the art will appreciate that various modifications and changes can be made without departing from the spirit and scope of the present disclosure.
Claims (10)
1. The utility model provides a realize all-round measuring laser particle analyzer which characterized by: the device comprises a rotary laser transmitting receiver and a sample pool, wherein the rotary laser transmitting receiver can be rotatably arranged on the periphery of the sample pool by taking the sample pool as a rotation center, the rotary laser transmitting receiver comprises a rotating device and a measuring device arranged on the rotating device, and the measuring device is used for transmitting laser signals to the sample pool and detecting echo signals; the measuring device is arranged on the rotating device through a semi-annular or annular-like shell; a through hole is formed in the position of a shell for transmitting laser and receiving echo signals by the measuring device;
the rotating device of the rotating laser transmitting and receiving device is set to rotate by 0-180 degrees, the rotating laser transmitting and receiving device is an instrument surrounding the center of the annular sample cell, the particle size in the sample cell is measured by rotating by 1 degree every time, the omnibearing size of the particles is obtained, and the specific size of the irregular particle size is obtained.
2. The laser particle analyzer for realizing omnibearing measurement as claimed in claim 1, wherein: the measuring device of the rotary laser transmitting and receiving device comprises a laser, a lens, a pinhole, a plano-convex cylindrical lens, a main detector center hole and a main detector, wherein the laser, the lens, the pinhole, the plano-convex cylindrical lens, the main detector center hole and the main detector are sequentially arranged on the same optical axis, and the optical axis penetrates through the center of the sample cell.
3. The laser particle analyzer for realizing omnibearing measurement as claimed in claim 2, wherein: the measuring device of the rotary laser transmitting receiver also comprises a large-angle detector which is annularly arranged by taking the sample cell as the center.
4. The laser particle analyzer for realizing omnibearing measurement as claimed in claim 3, wherein: the number of the large-angle detectors of the rotary laser transmitting and receiving device is multiple.
5. The laser particle analyzer for realizing omnibearing measurement as claimed in claim 4, wherein: the plurality of large-angle detectors of the rotary laser transmitting and receiving device are distributed on the same circle which takes the center of the sample cell as a circular point, and the radius is the distance between the pinhole and the center of the sample cell.
6. The laser particle analyzer for realizing omnibearing measurement as claimed in claim 2, wherein: the distance from the pinhole to the center of the sample pool is equal to the distance from the central hole of the main detector to the center of the sample pool.
7. The laser particle analyzer for realizing omnibearing measurement as claimed in claim 2, wherein:
the measuring device is arranged on the rotating device through a bracket fixed on a quasi-semi-annular or annular shape.
8. The method for measuring the particle size of the laser particle analyzer based on any one of claims 1 to 7, which is characterized by comprising the following steps:
the center position of the correction sample pool is positioned on the rotating center of the rotating laser transmitting receiver, and the laser, the lens, the pinhole, the plano-convex cylindrical lens, the central hole of the main detector and the main detector are positioned on the same optical axis passing through the center of the sample pool;
setting the rotation angle of the rotating laser transmitting receiver, and controlling a laser to transmit laser signals at different angles;
and receiving the echo signals scattered by the sample particles, and analyzing the particle size distribution of the sample to be detected according to the echo signals.
9. The particle size measuring method according to claim 8, wherein:
the echo signal comprises a scattered light signal of the transmitted laser signal after scattering by a sample of the sample cell.
10. The particle size measuring method according to claim 8, wherein:
the method for setting the rotation angle of the rotating laser transmitting receiver and controlling the laser to transmit laser signals at different angles is to set a set value of the rotation angle and measure the rotation angle of the rotating set value every time until the rotation angle reaches 180 degrees to finish measurement.
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