# US 12,000,818 B2 · Device for water examination > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,000,818 B2 - Document ID: US12000818B2 - Status: Granted - Kind: B2 - Application number: 17/600,521 - Filed: 2020-09-24 - Published: 2022-10-06 - Granted: 2024-06-04 - Earliest claimed: 2020-09-18 - Assignees: The Wave Talk, Inc. - Applicants: The Wave Talk, Inc. - Inventors: Young-Dug Kim; Kyuong man Cho; Guk hyun Nam - Web page: https://patentgrep.com/patent/US12000818B2 ## CPC - G01N 33/18: Water - G01N 15/02: Investigating particle size or size distribution (by measuring osmotic pressure G01N7/10; investigating sedimentation of particle suspensions G01N15/04; investigating individual particles G01N15/10) - G01N 15/14: Optical investigation techniques, e.g. flow cytometry - G01N 21/4788: {Diffraction (for sizing particles G01N15/0205)} - G01N 21/51: inside a container, e.g. in an ampoule (G01N21/53 takes precedence) - G01N 21/85: Investigating moving fluids or granular solids - G01N 21/94: Investigating contamination, e.g. dust (G01N21/85 takes precedence) - G01N 2021/479: {Speckle} - G01N: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES (measuring or testing apparatus or processes other than immunoassay, involving enzymes or microorganisms C12M, C12Q) ## Abstract Provided is a water examination device including: a main body; a cup accommodation unit formed inward from a surface of the main body such that a cup containing a fluid is accommodated therein; a wave source for irradiating a wave toward the cup accommodation unit; a detector for detecting a laser speckle generated by multiple scattering of the irradiated wave in the fluid, at every time point set in advance; and a controller for estimating whether foreign substances exist in the fluid in real-time by using the detected laser speckle. ## Claims ### Claim 1 A water examination device comprising: a main body; a cup accommodation unit formed inward from a surface of the main body, and wherein the cup accommodation unit is adapted to receive a cup containing fluid; a wave source for irradiating a wave toward the cup accommodation unit; a detector for detecting a laser speckle generated by multiple scattering of the irradiated wave in the fluid, in time-serial manner; and a controller for estimating whether foreign substances exist in the fluid in real-time by using the detected laser speckle, wherein the cup accommodation unit comprises: a bottom portion formed in the main body; and a wall portion extending from the bottom portion toward the surface of the main body, wherein the bottom portion and the wall portion form a receiving region that is adapted to receive the cup, and wherein the wall portion is formed to have an annular shape and is formed to be narrowed toward an upper portion of the main body; and wherein an angle between the bottom portion and the wall portion is not a right angle. ### Claim 2 (depends on 1) The water examination device of claim 1, wherein the angle ranges from 85° to 88°. ### Claim 3 (depends on 1) The water examination device of claim 1, wherein three or more support portions protrude from the bottom portion. ### Claim 4 (depends on 3) The water examination device of claim 3, wherein the bottom portion is substantially flat, and wherein the three or more support portions are adapted to contact the cup when the cup is received within the cup accommodation unit. ### Claim 5 (depends on 1) The water examination device of claim 1, wherein the bottom portion or the wall portion includes a multi-scattering amplification region for amplifying a number of times that the wave irradiated from the wave source is multiple scattered in the fluid. ### Claim 6 (depends on 5) The water examination device of claim 5, wherein the multi-scattering amplification region includes a multiple scattering material to amplifies the number of multiple scattering in the fluid by reflecting at least some of the wave emitted from the fluid onto the fluid. ### Claim 7 (depends on 1) The water examination device of claim 1, wherein the controller is configured to obtain a temporal correlation of the detected laser speckle by using the detected laser speckle, and estimate whether microorganisms exist in the fluid in real-time based on the obtained temporal correlation. ### Claim 8 (depends on 7) The water examination device of claim 7, wherein the temporal correlation includes a difference between first image information of the laser speckle detected at a first time point and second image information of the laser speckle detected at a second time point that is different from the first time point. ### Claim 9 (depends on 8) The water examination device of claim 8, wherein the first image information and the second image information include at least one of pattern information of the laser speckle and intensity information of the wave. ### Claim 10 (depends on 1) The water examination device of claim 1, wherein the controller is configured to obtain a spatial correlation of an interference pattern of an optical image detected by the detector, and determine whether microorganisms exist in the fluid based on a change in the spatial correlation of the interference pattern over time. ### Claim 11 A water examination method comprising: inserting, into a cup accommodation unit, a cup in which a fluid is capable of being accommodated; irradiating, by a wave source, a wave having coherence to the cup accommodation unit, in which the cup is accommodated; detecting, by a detector, a laser speckle generated by multiple scattering of the irradiated wave from the wave source in the fluid, in time-serial manner; and estimating, by a controller, whether microorganisms exist in the fluid in real-time by using the detected laser speckle, and wherein the cup accommodation unit comprises: a bottom portion formed in the main body; and a wall portion extending from the bottom portion toward the surface of the main body and formed to surround at least a part of a side surface of a cup accommodated in the cup accommodation unit, wherein the wall portion is formed to have an annular shape and is formed to be narrowed toward an upper portion of the main body; and wherein an angle between the bottom portion and the wall portion is not a right angle.