Ultrasonic particle size measuring instrument and ultrasonic measuring device

摘要

The ultrasonic particle size measuring device (1) receives the ultrasonic pulses irradiated and scattered on the fine particles (5) and generates a first scattering amplitude Ψ (t, T), and a first (1) The particle diameter of the fine particle (5) is calculated by calculating the amplitude r and the phase θ based on the real part and the imaginary part of the second scattering amplitude Ψ (f, T) obtained by Fourier transforming the scattering amplitude Ψ (t, T). And a particle diameter calculation unit (3).