Device for measuring 3D size and distribution of micro particles

Abstract

The invention discloses a device for measuring the 3D size and the distribution of micro particles. The device comprises a light source, a condensing lens, a transparent cylinder channel, a video microscope, a digital camera and two plane mirror groups. High-brightness flare light emitted by the light source is condensed into parallel light by the condensing lens, the parallel light is divided into three paths, vertically penetrates through the transparent cylinder channel from different directions and projects on the video microscope, and a series of three images formed by enabling the three paths of light to pass through the video microscope are recorded by the digital camera. Transparent liquid containing to-be-measured micro particles flows in the cylinder channel, and the three images refer to images of a same part of particles photographed with different angles simultaneously. After the same particles in the three images are identified, the 3D size of the particles is obtained by virtue of two-dimensional profile comparison and recovery computing of the three images, finally the multiple particles in the series of images are counted by a computer, the 3D sizes of the particles are combined, and the 3D size distribution of the particles is obtained.

Description

technical field [0001] The invention relates to an optical measurement system, in particular to 3D size and distribution measurement of tiny particles. Background technique [0002] The use of optical methods to measure the relevant physical quantities of tiny particles has been widely used due to the advantage of not contacting the sample. The measurement methods include scattering methods, diffraction methods, transmission methods, and image methods. [0003] Patent documents CN1664501A, CN102834689A, US2011310386A1, CN102564928A, US007528959B2, JP2007298327A, WO8904472A1, etc. disclose some devices for measuring particle size and distribution by scattering method. Document CN101802589A measures particle size by diffraction method. The document CN202119698U realizes the counting of cell particles by the transmission method. Document CN102834689A adopts an image method to measure particle size, spatial position and brightness. Document CN20103491A measures particle size,...

AI Technical Summary

Problems solved by technology

[0004] The above-mentioned patent documents disclose some devices for measuring particle size and distribution. Since particles are generally non-spherical, this size usually refers to the equivalent volume spherical diameter value or Stoke diameter or area volume diameter d of the particle 32 , but no matter which diameter it is, it cannot reflect the three-dimensional size of the particle

Regarding the detection of non-spherical particles, documents CN102323191A, WO8904472A1, and CN102519850A disclose some detection methods, but these documents only detect the shape rate of the particles, that is, the aspect ratio, and cannot give the three-dimensional size of the particles

As for the traditional non-automated microscope or electron microscope observation method, the two-dimensional image of the particle can be detected to measure the two-dimensional size of the particle, but the three-dimensional size of the particle cannot be obtained

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