Rion Company Ltd.

Kioxia Corporation

National Institute of Advanced Industrial Science and Technology

Kazuna Bando

Kaoru Kondo

Takuya Tabuchi

Sota Kondo

Eishi Shiobara

Hidekazu Hayashi

Haruhisa Kato

Yusuke Matsuura

Hiroshi Tomita

Provided is a particle measurement device in which irradiation light emitted by a light source is expanded by an expander in a shape satisfying the requirements of a diffractive optical element, converted into parallel light, and made to enter the diffractive optical element. The diffractive optical element shapes the irradiation light entering therein into a flat top beam in which the cross section in the focal position thereof has an elongate rectangle shape. The intensity distribution of light can be made substantially uniform in a detection area formed by the shaped irradiation light.

Particle measuring device

According to one embodiment, a particle measuring method is disclosed. The method includes irradiating a detection liquid with light. The detection liquid contains methyl salicylate. The method further includes converting scattered light from the detection liquid into an electric signal by using photoelectric conversion after irradiating the detection liquid with the light. The method further includes performing a particle measurement on the detection liquid by using the electric signal.

Particle measuring method and detection liquid

Provided is a particle measuring device and a particle measuring method for measuring a particle size with favorable accuracy. A flow cell () includes a flow passage () of sample fluid. An irradiation optical system () irradiates, with light from a light source (), the sample fluid in the flow passage (). An imaging unit () captures, from an extension direction of the flow passage (), an image of scattered light from the particle in a detection region in the flow passage (), the light passing through the detection region. A particle size specifying unit specifies a movement amount of the particle in a two-dimensional direction by Brownian motion based on multiple still images of a particle image captured at a predetermined frame rate by the imaging unit (), thereby specifying the particle size of the particle from the movement amount in the two-dimensional direction.

Particle measuring device and particle measuring method

Growing community of inventors

Tokyo, Japan

Kazuna Bando