The new generation of particle characterisation – Image Analysis with the CAMSIZER X2

Particle characterisation by Dynamic Image Analysis (DIA) has become increasingly popular in recent years. This technique delivers very accurate particle size distributions in a very short time, is virtually maintenance-free and, unlike other methods like sieve analysis or laser diffraction, provides particle shape information. The CAMSIZER X2 is the latest generation of Retsch Technology’s most versatile digital image analyser. It measures granulates, powders and suspensions in a size range from 0.8 µm to 8 mm. Typical applications include pharmaceuticals, foodstuff, chemicals, metal powders, polymers, raw materials like ores, coal or sand, and many more.

Wide measurement range – effective dispersion

To achieve excellent measurement results for fine particles, efficient dispersion and powerful high-resolution optics are essential. The CAMSIZER X2 offers three alternative options for dispersion: air-jet dispersion of fine powders, free-fall measurement of fragile particles, and a wet unit for suspensions. The instrument can be adapted to the required mode of operation within a few seconds.

The patented optical system features two ultra-bright LED light sources and two high resolution CCD cameras. This dual-camera technology ensures that one camera detects fine particles with great accuracy whereas the other camera will focus on the large particles. Thus, the CAMSIZER X2 achieves a wider measurement range than any other image analyser. With more than 300 images analysed per second, the result is based on the characterisation of hundreds of thousands or even millions of individual particles. One measurement typically takes only 1 to 3 minutes.

Simultaneous analysis of size and shape

The application example shows CAMSIZER X2 measurement data of several metal powder samples in a size range from 1 µm to 100 µm such as are used in different powder metallurgical processes. The results show variations in mean size as well as width of distribution (Figure 2). Not only does the CAMSIZER X2 determine the size distribution, it also measures the particle shape. Figure 3 shows the result for the aspect ratio (particle width divided by particle length) for every sample. The aspect ratio of round, isometric particles is close to 1, the corresponding curve will plot on the right side of the diagram. Shape analysis of the metal powders is important to judge the quality of the production and the suitability for the subsequent processing. Irrespective of the differences in chemistry, density, size and shape, all samples can be reliably analysed with the CAMSIZER X2.

What you see is what you get

Only image analysis provides a clear and unambiguous definition of particle size and shape. With every measurement, a wealth of information on particle properties is obtained: Particle length, width, equal area diameter, aspect ratio, symmetry, roundness, etc. The CAMSIZER X2 matches and even outperforms any other method of particle characterisation in the size range from 0.8 µm – 8mm.

Conclusion

Dynamic Image Analysis with the CAMSIZER X2 provides all relevant data on particle size and shape. Compared to other techniques like laser diffraction or (electron or optical) microscopy, the measurement data are based on a larger number of particles and are therefore statistically more relevant and have better repeatability. One measurement only takes 1 to 3 minutes, allowing for high sample throughput and continuous quality control. The CAMSIZER X2 is therefore suited for accurate and reproducible characterisation of a great variety of different materials.