In the fields of materials science, chemical engineering, pharmaceuticals, ceramics, and new energy, precise measurement of particle size is the core link in controlling product quality and optimizing process flow. As the mainstream equipment for modern particle size analysis, wet laser particle size analyzer has become an important tool in scientific research and industrial production due to its high precision, wide detection range, and anti-interference ability. This article will systematically analyze the technical core of wet laser particle size analyzer from three dimensions: working principle, performance characteristics, and application advantages.

1、 Working principle: precise combination of light scattering and Mie theory

The core principle of wet laser particle size analyzer is based onMie scattering theoryFourier transform optical path technology. When a monochromatic laser beam is irradiated onto a group of particles suspended in a liquid medium, diffraction and scattering phenomena occur on the surface of the particles, and the spatial distribution of scattered light energy is directly related to the particle size. The specific process can be divided into three steps:

Light scattering signal acquisition

The scattering intensity of particles on laser varies with angle, with small particles (sub micron scale) producing wide-angle scattering and large particles (micron scale) forming narrow angle scattering. The instrument captures scattered light intensity at different angles through a high-density detection array (such as a fan-shaped matrix arrangement of photodetectors), forming a complete spectrum of light energy distribution.

Mie's theory inversion calculation

Using a full-scale Mie scattering model, considering the refractive index difference between particles and dispersed media, the light energy distribution is converted into particle size distribution data through nonlinear fitting algorithms. This model can cover0.02μmto2000μmWide range detection to avoid the limitations of Fraunhofer diffraction theory in sub micron particle analysis.

Wet circulation dispersion system

The sample is mechanically stirred and ultrasonically shaken (with a frequency of)20kHzThe above) and electromagnetic circulation pump function achieve uniform dispersion of particles. The circulation pipeline adopts a residue free design to ensure no waste liquid accumulation after testing and avoid cross contamination. For example, a certain model of instrument in Jiangsu can use a micro circulation system to10Complete pipeline replacement within seconds to ensure the accuracy of continuous testing.

2、 Performance characteristics: Five core advantages shape the industry**

1. Ultra wide detection range and high resolution

Mainstream model testing coverage0.1μmto800μmSome high-end devices are accessible0.02μmto2000μm. Switching through multi range lenses (such as0.1-260μmThe260-800μm）With high-density detection units (such as1024Channel), achieving seamless connection across the entire range. For example,WJL-608The instrument adopts a converging light Fourier transform optical path, which can simultaneously capture the scattered signals of submicron fine particles and millimeter coarse particles at the shortest focal length.

2. Anti interference wet dispersion technology

For agglomerated particles such as nano oxides and clay, the instrument is equipped with an ultrasonic anti dry burning system and automatic addition of dispersants. Taking the Malvern Panaco series as an example, its ultrasound power can be adjusted100WThe accuracy of dispersant addition reaches0.1mLEnsure the true particle size distribution of materials such as kaolin and graphite. Experimental data shows that the repeatability error of wet testing can be controlled within±0.5%Within, far superior to dry testing±2%.

3. Intelligent operation and data security

fully intelligentSOPThe mode supports one click completion of water inlet, exhaust bubble, background collection, sample dispersion, and data saving. Laser intelligent management system realizes laser3Stable startup within seconds, with a lifespan exceeding2.5Ten thousand hours. Data output compatibilityEXCELThePDFFormat, compliantISO13320TheGMPandFDA/21CFR11Standard. For example, a certain brand of instrumentPADMASThe system can generateD10TheD50TheD90wait12Item feature parameters and support custom grading analysis.

4. Environmental adaptability and maintenance convenience

The dust-proof and shockproof design (such as optical platform vibration isolation) and strong anti-corrosion structure (acid and alkali resistant solvents) have expanded the application of equipment in harsh environments such as chemical and mining. The sample window quick change device reduces maintenance time to5Within minutes, the design of the circulation pump with no residual liquid accumulation avoids the risk of pipeline blockage.

5. Dynamic monitoring and real-time feedback

Some high-end models integrate dynamic light scattering modules, which can synchronously monitor the Brownian motion of nanoparticles, achieving particle size andZetaDual analysis of potential. For example, in the development of lithium battery materials, this function can provide real-time feedback on the agglomeration status of positive electrode material particles, providing data support for the slurry dispersion process.

3、 Application scenario: Full chain coverage from laboratory to production line

Wet laser particle size analyzer has been widely used in metals/Non metallic powders (such as alumina, silica), ceramic raw materials (kaolin, talc), pharmaceutical particles（API, auxiliary materials), food additives (lotion, starch) and new energy materials (cathode materials, diaphragm coatings). Its core values are reflected in:

R&D stage: Optimize material formulation through multimodal granularity analysis;

Production quality control: online monitoring of slurry particle size to reduce batch differences;

Failure analysis: Quickly identify the particle size causes of defects such as product cracking and foaming.

Conclusion

The wet laser particle size analyzer achieves precision, automation, and intelligence in particle size detection through the deep integration of light scattering theory and wet dispersion technology. Its ultra wide detection range, strong anti-interference ability, and full process data management not only meet the stringent requirements of modern industry for particle analysis, but also provide key technical support for new material research and process innovation. With the development of nanotechnology and intelligent manufacturing, wet laser particle size analyzers will continue to evolve towards higher resolution, faster detection speed, and more intelligent data analysis, becoming one of the core tools for promoting industrial upgrading.