US 12,487,176 B2
Accurate turbidity measurement system and method, using speckle pattern
Young Dug Kim, Seongnam-si (KR); and Kyoung Man Cho, Seoul (KR)
Assigned to THE WAVE TALK, INC., Daejeon (KR)
Appl. No. 18/278,977
Filed by THE WAVE TALK, INC., Daejeon (KR)
PCT Filed May 30, 2022, PCT No. PCT/KR2022/007636
§ 371(c)(1), (2) Date Aug. 25, 2023,
PCT Pub. No. WO2022/260327, PCT Pub. Date Dec. 15, 2022.
Claims priority of application No. 10-2021-0074059 (KR), filed on Jun. 8, 2021.
Prior Publication US 2024/0133808 A1, Apr. 25, 2024
Prior Publication US 2024/0230531 A9, Jul. 11, 2024
Int. Cl. G01N 21/53 (2006.01); G01N 15/075 (2024.01); D06F 34/22 (2020.01); D06F 103/20 (2020.01); G01N 15/00 (2006.01); G01N 15/01 (2024.01); G01N 21/47 (2006.01); G01N 21/85 (2006.01)
CPC G01N 21/53 (2013.01) [G01N 15/075 (2024.01); D06F 34/22 (2020.02); D06F 2103/20 (2020.02); G01N 2015/0053 (2013.01); G01N 2015/019 (2024.01); G01N 2021/479 (2013.01); G01N 21/85 (2013.01); G01N 2201/06113 (2013.01); G01N 2201/0668 (2013.01)] 8 Claims
OG exemplary drawing
 
1. An accurate turbidity measurement system using a speckle pattern, the system comprising:
a measuring container which has a light input part disposed in one side thereof and configured to enable laser light to be inputted, has a light scattering space defined therein and configured to enable multiple reflection or multiple scattering of the laser light through multiple paths, and has a light output part disposed in an other side thereof and configured to enable a measurement of micro-turbidity by using the speckle pattern generated in the light scattering space;
an optical dilution member which is disposed in at least a portion of the light scattering space, has a sample receiving part disposed in one side thereof and configured to receive a sample being measured, and comprises an optical dilution medium configured to dilute the speckle pattern of the sample and enable the measurement of the micro-turbidity of the sample;
a laser source configured to emit the laser light to the light input part;
a first camera configured to photograph the speckle pattern of the light output part; and
a speckle pattern variation calculation part configured to measure a variation over time of the speckle pattern using video information received from the first camera,
wherein the speckle pattern variation calculation part is configured to calculate a micro-turbidity value proportionally by multiplying a measured turbidity value obtained from the variation of the speckle pattern with a multiple of an area of the optical dilution member based on an area of the sample.