Patent ID: 11879822
Assignee: HORIBA, LTD.
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 10:
11. A particle size distribution measuring device comprising:
a light irradiating device including a light source that irradiates a particle group;
an image capturing device including a first component and an image sensor that captures an image of the particle group;
a first hardware processor that receives image data of the image of the particle group from the image capturing device; and
a second hardware processor that calculates an overall particle size distribution which is a particle size distribution of the particle group, wherein
the light irradiating device and the first component of the image capturing device are arranged on opposing sides of the particle group such that light passes from the light irradiating device through translucent particles in the particle group before reaching the first component of the image capturing device, the light reaching the first component being directed to the image sensor, and the translucent particles in the image each have light and dark regions resulting from refraction of the light passing through the translucent particles,
the first hardware processor is configured to discriminate whether a particle depicted in the image is a first translucent particle or a second translucent particle, the first translucent particle being a type different from that of the second translucent particle, on the basis of a difference in light and dark regions that appear in the image as a result of refraction of light passing through the particle, the difference in the image arising from a difference between a refractive index of the first translucent particle and a refractive index of the second translucent particle,
the first translucent particle is a measurement target;
the first hardware processor calculates a second translucent particle distribution which is a particle size distribution of the second translucent particle on the basis of the image data received and a result of the discrimination, and
the second hardware processor subtracts an influence of the second translucent particle distribution from the overall particle size distribution to calculate a target particle size distribution which is a particle size distribution of the measurement target.