| 摘要 |
PROBLEM TO BE SOLVED: To precisely and efficiently measure an adhesive force, even when the particle size distribution of particles to be measured is wide. SOLUTION: A computing unit 8 stores parameters required for measuring the adhesive force F, such as densityρof the particles 22 as a measuring object, densityρ0 of a medium, a propagation constant k (=2π/λ) and the like. The computing unit 8 finds the adhesive force F by using the respective parameters and a sound-pressure amplitude A [N/m<2> ] adjusted by a sound-pressure adjusting device 2. The computing unit 8 analyzes an image imaged by a microscope 6, it finds the peripheral length and the area on the projection image of each spherical particle 22, and a surface index Si which affects the acoustic radiating force of each particle is computed by using them.
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