레이저 회절 방식 입도분석기 해상도 향상 연구

• Published in: 한국분무공학회지 Vol. 30; no. 2; pp. 63 - 71
• Main Authors: 김기성, Ki Seong Kim
• Format: Journal Article
• Language: Korean
• Published: 한국분무공학회 30.06.2025
• Subjects: Fraunhofer diffraction; Inverse problem; Particle size analyzer; Particle size distribution; Resolution; Scattering matrix; 기계공학; 산란 행렬; 역 문제; 입도분석기; 입자 크기분포; 프라운호퍼 회절; 해상도
• ISSN: 1226-2277; 2288-9051
• DOI: 10.15435/JILASSKR.2025.30.2.63

In this study, we aimed to address the low-resolution issue of particle size distribution (PSD) measurements obtained using laser diffraction particle size analyzers equipped with a long focal length Fourier lens, which enables measurement over a wide particle size range. To achieve this, we developed a simulation program that models light scattering by particles and solves the associated inverse problem to estimate the PSD. Using this program, we investigated how the mean particle size (μ), standard deviation (σ), and the PSD range influence the resolution of the estimated PSD. Furthermore, we proposed a two-step PSD estimation method and validated its effectiveness through simulation studies. Specifically, we evaluated the method’s performance when the input PSD lies in the upper, middle, or lower regions of the analyzer’s measurement range. The results demonstrated that narrowing the measurement range and recalculating the scattering matrix in the second estimation step enabled the estimated PSD to closely match the actual PSD across all cases. Even under extreme conditions with a very narrow σ of 1 μm, the estimated PSD showed good agreement with the input PSD.