Optical measurement method and optical measurement device

The optical measurement method and apparatus address the challenge of identifying and measuring multiple particle types by using light absorption and intensity variation to calculate diffusion coefficients and moving average distances, ensuring accurate particle size determination.

WO2026105573A1PCT designated stage Publication Date: 2026-05-21FUJIFILM CORP
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Patent Information

Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
FUJIFILM CORP
Filing Date
2025-10-28
Publication Date
2026-05-21

AI Technical Summary

Technical Problem

Existing methods, such as those described in Patent Document 1, are unable to identify and measure the particle types and sizes of multiple types of particles present in a dispersion, leading to inaccuracies in particle size determination.

Method used

An optical measurement method and apparatus that uses light of varying intensities absorbed by particle species to determine particle types and sizes by calculating diffusion coefficients and moving average distances, allowing for discrimination and calculation of particle sizes.

Benefits of technology

Enables accurate identification and measurement of particle types and sizes in dispersions containing multiple types of particles, providing precise particle size determination even in the presence of varying light absorption properties.

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Abstract

The present invention provides an optical measurement method and an optical measurement device for identifying a particle species among at least two kinds of particles contained in a dispersion liquid and measuring the particle diameter thereof. The optical measurement method includes: an incidence step for causing light having a wavelength that is absorbed by a particle species to be identified among a plurality of particle species to be incident on a dispersion liquid which contains at least two kinds of particles while changing the intensity of the incident light; an acquisition step for obtaining an intensity signal of scattered light of the dispersion liquid for each intensity of the incident light obtained by causing the light to be incident on the dispersion liquid while changing the intensity of the incident light; a determination step for determining the light-absorbed particle species on the basis of the diffusion coefficient of the particles calculated from the intensity signal of the scattered light for each intensity of the incident light; and a calculation step for calculating the particle diameter of the particles of the particle species to be identified from the diffusion coefficient of the particles that are determined to be the light-absorbed particle species.
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