The testing principle of carbon black dispersimeter is mainly based on optical microscopy imaging combined with digital image processing technology or laser scattering technology. The following is a detailed explanation of these two principles:
1、 Optical microscopy imaging combined with digital image processing technology
Imaging principle:
The instrument captures the distribution of carbon black particles in the sample through a high-power optical lens and digitizes the microscopic images.
The optical microscope first magnifies the small particles to be measured and images them on the photosensitive surface of the CCD camera.
The camera converts optical images into video signals, which are then transmitted through a USB data cable and stored in the computer's processing system.
Image processing and analysis:
The computer identifies the edges of particles based on the received digitized microscopic image signals.
Calculate the relevant parameters of each particle according to a certain equivalent pattern (such as equal area circle, equivalent short diameter, equivalent long diameter, etc.), including scale (equivalent diameter, long short diameter, area, perimeter, etc.) and morphology (roundness, rectangularity, aspect ratio, etc.).
The instrument can automatically calculate the size and shape parameters of all particles within the field of view, and generate a test report through statistical analysis.
Testing process and characteristics:
During the testing process, the larger the magnification, the smaller the focal length, the smaller the field of view, and the darker the light. Therefore, it is necessary to choose an appropriate magnification based on the carbon black content of the sample.
The instrument has the characteristics of high-precision quantitative analysis, breaking through the subjectivity of manual observation. Through software algorithms for pixel level analysis of images, the detection result error can be controlled within a very small range.
The single inspection time has been shortened to a few minutes, which is several times more efficient than traditional metallographic analysis and meets the rapid inspection needs of large-scale production in enterprises.
2、 Laser scattering technology
Working Principle:
Laser scattering technology calculates the dispersion of particles by dispersing laser light on a sample and measuring the brightness difference of the light reflected forward and laterally from the sample.
This technology can measure the scattering intensity distribution function (PSD) of the sample and calculate dispersion indicators such as the average aggregation degree and maximum aggregation degree of carbon black by analyzing PSD.
Application features:
Laser scattering technology is suitable for measuring the dispersion of carbon black particles in liquids or solids, and has the advantages of non-contact and non-destructive.
By measuring the relationship between the intensity of scattered light and factors such as particle size, concentration, and distribution, the dispersion of carbon black can be quantified.