What is the principle of light scattering particle size testing?

What is the principle of light scattering particle size testing?

According to Stokes' law, the particle size can be obtained by measuring the settling velocity of the particle. In the actual measurement process, it is difficult to directly measure the settling velocity of particles, so the change rate of light intensity through suspension with time is often used to indirectly reflect the settling velocity of particles in the process of particle size measurement by sedimentation method. According to Beer's law, the quantitative relationship between light intensity and particle size at a certain time is:

In this way, we can get the change rate of light intensity by measuring light intensity at different times, and the particle size distribution can be obtained.

What is the testing principle of image particle size analyzer?

The particles are imaged on an imager, and the smallest units that make up the image are pixels, each of which has a specific size. Image particle size analyzer is to calculate the area of each particle by counting how many pixels it occupies in the image, and then calculate the diameter of the circle of equal area.

What are the differences between dynamic image particle size analzyer and static image particle size analyzer?

Compared with static image particle size analyzer, dynamic image particle size analyzer has the advantages of easy particle dispersion, no orientation error, large sampling volume and good representativeness. However, this method is easy to tail the moving image, the image quality is also poor, can not see the particle morphology, and also requires high-speed processing and analysis system.