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公开(公告)号：US10234370B2
公开(公告)日：2019-03-19
申请号：US15561269
申请日：2016-03-30
发明人： Haruhisa Kato , Naoko Oouchi , Ayako Nakamura
摘要： To provide a particle size measuring device that enables simple in-line measurement of the particle size even in a case of nano-sized particles during dispersion. Provided is a particle size measuring device which measures the particle size of particles that perform Brownian motion in a dispersion medium. The particle size measuring device includes a transparent column which accommodates a dispersion medium therein; a laser light irradiating unit which irradiates the dispersion medium in the column with laser light; an imaging unit which includes a camera that images the dispersion medium in the column; an image analyzing unit which acquires a displacement of corresponding particles from at least a plurality of images captured at a predetermined time interval Δt; and a calculating unit which calculates the particle size based on the fact that a root mean square value of the displacement is proportional to kBT/3πηd where kB represents a Boltzmann constant, T represents an absolute temperature, η represents a viscosity coefficient of the dispersion medium, and d represents the particle size.
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公开(公告)号：US11280652B2
公开(公告)日：2022-03-22
申请号：US16466696
申请日：2017-12-05
发明人： Haruhisa Kato , Yusuke Matsuura , Ayako Nakamura
IPC分类号： G01F1/708 , G01F1/7086 , G01N15/02 , G01N15/00
摘要： A measuring method enabling simple and accurate measurement of a flow velocity distribution in a flow field inside a flow passage of an optical cell and a particle size-measuring method using the measuring method are provided. Providing a tracer particle of a smaller size than wavelength λ of laser light into the flow passage and capturing a bright spot attributed to light scattering from tracer particles by camera, and obtaining the flow velocity distribution by the analysis unit by obtaining an amount of movement of each tracer particle from movement of the bright spot and correcting a Brownian motion component from a correlation between an average value of variations of the amount of movement and Brownian motion are performed.
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公开(公告)号：US20210055197A1
公开(公告)日：2021-02-25
申请号：US17051835
申请日：2019-08-30
发明人： Haruhisa Kato , Yusuke Matsuura , Ayako Nakamura
IPC分类号： G01N15/02
摘要： The purpose of the present invention is to provide a particulate observation device using light scattering, which includes a means for determining the three-dimensional position of a particle, and can measure an accurate particle size or impart various properties of same. The present invention is characterized by including a position determination means which captures, with an optical microscope, an image of light scattered from particles in a dispersion medium to which laser light is emitted, and determines a three-dimensional position of each particle from the obtained two dimensional image, wherein the position determination obtains two-dimensional coordinates along the two-dimensional image from luminescent point positions of the particles, and determines the depth position along a coordinate axis vertical to the two-dimensional image from the diameters of diffraction fringes of the luminescent points.
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公开(公告)号：US11774340B2
公开(公告)日：2023-10-03
申请号：US17276847
申请日：2019-09-30
申请人： NATIONAL INSTITUTE OF ADVANCED INDUSTRIAL SCIENCE AND TECHNOLOGY , RION Co., Ltd. , Kioxia Corporation
发明人： Haruhisa Kato , Yusuke Matsuura , Ayako Nakamura , Kaoru Kondo , Takuya Tabuchi , Hiroshi Tomita , Hidekazu Hayashi
CPC分类号： G01N15/0227 , G06T7/20 , G06T7/60 , G06T7/80 , G06T2207/10016
摘要： For an easy calibration using calibration particles, provided is a measuring device to capture images of target objects. An image analyzer acquires multiple images obtained at a predetermined time interval, (a) specifies the mean-square displacement of a bright point of a calibration particle based on the displacement of the bright point of the calibration particle in the multiple images in a calibration mode, and (b) specifies the mean-square displacement of a bright point of the target particle based on the displacement of the bright point of the target particle in the multiple images in a measurement mode. A particle size analyzer (c) derives the particle size of the target particle from the mean-square displacement of the bright point of the target particle based on the mean-square displacement of the bright point of the calibration particle and the particle size of the calibration particle in an analysis mode.
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公开(公告)号：US11415500B2
公开(公告)日：2022-08-16
申请号：US17051835
申请日：2019-08-30
发明人： Haruhisa Kato , Yusuke Matsuura , Ayako Nakamura
摘要： The purpose of the present invention is to provide a particulate observation device using light scattering, which includes a means for determining the three-dimensional position of a particle, and can measure an accurate particle size or impart various properties of same. The present invention is characterized by including a position determination means which captures, with an optical microscope, an image of light scattered from particles in a dispersion medium to which laser light is emitted, and determines a three-dimensional position of each particle from the obtained two dimensional image, wherein the position determination obtains two-dimensional coordinates along the two-dimensional image from luminescent point positions of the particles, and determines the depth position along a coordinate axis vertical to the two-dimensional image from the diameters of diffraction fringes of the luminescent points.
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