CN-224231560-U - Particle size measuring device based on combination dynamic light scattering method and sedimentation method

Abstract

The utility model discloses a particle size measuring device based on a combination dynamic light scattering method and a sedimentation method, which comprises a laser, a light intensity adjusting unit, a sample cell, a constant temperature tank, a PD detector, an optical fiber head, an APD detector, a data acquisition unit, a PC and a control unit. The laser emits incident laser, the incident laser passes through the light intensity adjusting unit, passes through the sample cell and the sample, then enters the PD detector, the data collecting unit collects transmitted light signals and transmits the transmitted light signals to the software for calculating the particle size and concentration of settled large particles, the scattered light is received through an optical fiber head with a fixed angle of 90 degrees or 160-175 degrees, and the scattered light is converted into digital signals through the APD detector, enters the data collecting unit and transmits the digital signals to the software for calculating the particle size of particles in a non-settled nanometer range. According to the technical scheme, the particle size distribution information of the wide-distribution particle dispersion system in the range of nanometer-micrometer is measured in one test process.

Inventors

• HAN XIUXIU
• LI XIAOGUANG
• LIU YUEQIANG
• YANG HONGYU
• ZHENG HAO
• LI XIAOXU
• NING HUI
• Huang Caihao
• CHEN QUANWEI

Assignees

• 丹东百特仪器有限公司
• 深圳市百利特科技有限公司

Dates

Publication Date

20260512

Application Date

20250529

Claims (3)

1. 1. The particle size measuring device based on the combination of the dynamic light scattering method and the sedimentation method is characterized by comprising a laser, a light intensity adjusting unit, a sample cell, a constant temperature tank, a PD detector, an optical fiber head, an APD detector, a data acquisition unit, a PC and a control unit; the laser emits laser light to irradiate on a sample in the sample cell; The sample to be measured is contained in the sample pool and is suspension liquid containing large particles with sedimentation characteristics and small particles with non-sedimentation characteristics, and the refractive indexes of the large particles and the small particles are the same as the absorptivity; The light intensity adjusting unit comprises a group of attenuation sheets which are driven by a motor and are arranged on the rotating wheel and used for adjusting the incident light intensity; the sample pool is a container for containing a sample to be tested; The constant temperature tank reaches a set temperature value by receiving a command of the control unit, the precision is +/-0.1 ℃ and the range is-15 ℃ to 120 ℃; The PD detector is arranged in the 0-degree angle direction of the laser incidence direction, incident light enters the PD detector after passing through the sample cell, and the PD detector is used for detecting the energy of the transmitted light; the optical fiber head is placed at a fixed angle in the incidence direction of the laser; the data acquisition unit is used for receiving signals of the PD detector and the APD detector and transmitting the signals to the PC for calculation; The control unit is used for receiving the PC end instruction, outputting a control signal to control the temperature of the constant temperature tank to control the temperature of the test sample, and outputting a control signal to control the position of the light intensity adjusting unit to adjust the light intensity of the incident light.
2. 2. The particle size measuring device based on the combination of the dynamic light scattering method and the sedimentation method according to claim 1, wherein the internal section of the sample cell is a square with the length of 10mm multiplied by 10mm, the optical path L is 10mm, the sample Chi Rongji is more than or equal to 4ml, and the four sides are designed to be transparent, and the material is quartz or K9 glass.
3. 3. The particle size measuring device based on the combination of dynamic light scattering and sedimentation according to claim 1, wherein the placeable fixed angle comprises a 90-degree angle direction of the laser incidence direction or a 160-175-degree angle direction of the laser incidence direction, and the scattered light enters an APD detector through an optical fiber and the APD detector is used for detecting the energy of the scattered light.

Description

Particle size measuring device based on combination dynamic light scattering method and sedimentation method Technical Field The utility model relates to the field of particle size measurement, in particular to a particle size measurement device based on a dynamic light scattering method and a sedimentation method. Background The particle size measurement technology is widely applied to the fields of materials, chemistry and chemical industry, food and agriculture, semiconductors, biopharmaceuticals, energy environmental protection and the like, and plays an important role in different aspects of material performance and quality improvement, process adjustment and optimization, drug design, environmental protection monitoring and the like. The existing particle size measurement method has advantages and limitations, the principle of the sedimentation method is based on Stokes' law, the sedimentation speed of particles in liquid is measured to calculate, and the sedimentation method is suitable for measuring larger particles (micron-sized). The dynamic light scattering method is calculated by measuring scattered light fluctuation caused by Brownian motion of particles in liquid, is suitable for small-particle-size particles, and has high measurement accuracy and high speed. Dynamic light scattering requires that the sample be homogeneous without sedimentation, which does not allow detection of the nanoscale particulate component suspended in the liquid. Therefore, the sedimentation method or the dynamic light scattering method cannot be used alone to measure the particle size distribution of the sample with the particle size range covering the range of nanometers to micrometers. The utility model realizes measurement of particle size distribution information in a nanometer-micrometer range of a wide-distribution particle dispersion system in one test process, wherein the effective detection range of a sedimentation method is 1-50 μm, and the effective detection range of dynamic light scattering is 1 nm-1 μm. Disclosure of utility model Aiming at the problems of the existing measuring method, the utility model provides a measuring device for detecting the particle size of particles based on a dynamic light scattering method and a sedimentation method. The device has the advantages of simple operation, high efficiency, high temperature control capability, small required sample amount, wide measurement range, high overall measurement precision and the like. The technical scheme adopted by the utility model is as follows: the particle size measuring device based on the combination of the dynamic light scattering method and the sedimentation method comprises a laser, a light intensity adjusting unit, a sample cell, a constant temperature tank, a PD detector, an optical fiber head, an APD detector, a data acquisition unit, a PC and a control unit; The laser emits laser light to irradiate the sample in the sample cell; the sample to be measured is contained in the sample tank and is suspension liquid containing large particles with sedimentation characteristics and small particles with non-sedimentation characteristics, and the refractive indexes of the large particles and the small particles are the same as the absorptivity; the light intensity adjusting unit comprises a group of attenuation sheets which are driven by a motor and are arranged on the rotating wheel and used for adjusting the incident light intensity; The sample cell is a container for holding a sample to be tested, the internal section of the sample cell is square with the length of 10mm multiplied by 10mm, the optical path L is 10mm, the sample Chi Rongji is more than or equal to 4ml, and the sample cell is designed in a four-side light-transmitting way and is made of quartz or K9 glass; the constant temperature tank reaches a set temperature value by receiving a command of the control unit, the precision is +/-0.1 ℃ and the range is-15 ℃ to 120 ℃; The PD detector is arranged in the 0-degree angle direction of the laser incidence direction, the incident light enters the PD detector after passing through the sample cell, and the PD detector is used for detecting the energy of the transmitted light; The optical fiber head is placed at a fixed angle of the laser incidence direction, wherein the placeable angle comprises a 90-degree angle direction of the laser incidence direction or a 160-175-degree angle direction of the laser incidence direction, scattered light enters an APD detector through an optical fiber, and the APD detector is used for detecting the energy of the scattered light; The data acquisition unit is used for receiving signals of the PD detector and the APD detector and transmitting the signals to the PC for calculation; the control unit is used for receiving the PC end instruction, outputting a control signal to control the temperature of the constant temperature tank to control the temperature of the test sample, and outputting a c