2025 Volume 68 Pages 3-8
Background and Aims: Powder technology plays a significant role in various industrial products, with increasing demands for higher functionality driving the need for more advanced manufacturing processes. As these processes evolve, there is a growing need for enhanced techniques to evaluate powder properties. This report introduces two key devices developed by our company: the Parshe Analyzer® (PAS) for particle shape and size analysis, and the E-SPART Analyzer® (EST) for measuring particle charge distribution. These devices offer unique capabilities for precise particle characterization, meeting the sophisticated requirements of modern industrial applications.
Methods and Results: The PAS is a dynamic image analysis system used to measure particle size and shape. While laser diffraction and scattering methods are common for particle size distribution measurement, they lack the capability to evaluate particle shape and detect coarse particles within a sample. The PAS addresses these limitations by utilizing dynamic image analysis, allowing high-throughput measurement of a large number of particles suspended in liquid. With its flat sheath flow system, the PAS maintains precise focus, ensuring accurate measurements for particles ranging from sub-micron to over 100 μm. It also features automated lens switching and an optional auto-sampler for efficient sample dispersion.
A measurement example of silicon carbide (d50=5.6 μm) using the PAS is provided. After ultrasonic dispersion, the particles were analyzed, revealing variations in particle detection depending on the proximity of adjacent particles. This demonstrates the PAS’s capability to deliver both quantitative and qualitative data on particle size and morphology.
The EST is a device that measures particle size and charge using laser Doppler technology. It evaluates phase delay caused by particle inertia in an acoustic field to determine size and calculates charge based on drift velocity in an electric field. Unlike bulk methods like the Faraday cage, the EST provides detailed charge distribution data for individual particles. To address issues with discontinued parts, a new version of the EST is under development, featuring digital signal processing, miniaturization, and improved mobility.
Conclusions (Outlook): The PAS and EST offer unique and precise insights into particle properties, providing advanced solutions for research and quality control applications. The ongoing development of these devices is expected to further support innovations in industries that require accurate particle characterization.
https://ror.org/018hwpf05 