US 12,265,028 B2
Optical measurement device and water quality analysis system
Issei Kobayashi, Kyoto (JP); Keigo Sakamoto, Kyoto (JP); Kohei Hara, Kyoto (JP); and Kimihiko Arimoto, Kyoto (JP)
Assigned to HORIBA ADVANCED TECHNO, CO., LTD., Kyoto (JP)
Appl. No. 17/997,805
Filed by HORIBA Advanced Techno, Co., Ltd., Kyoto (JP)
PCT Filed Apr. 13, 2021, PCT No. PCT/JP2021/015336
§ 371(c)(1), (2) Date Nov. 2, 2022,
PCT Pub. No. WO2021/229980, PCT Pub. Date Nov. 18, 2021.
Claims priority of application No. 2020-086213 (JP), filed on May 15, 2020.
Prior Publication US 2023/0288332 A1, Sep. 14, 2023
Int. Cl. G01N 21/53 (2006.01); G01N 21/51 (2006.01); G01N 33/18 (2006.01)
CPC G01N 21/532 (2013.01) [G01N 21/51 (2013.01); G01N 33/1893 (2013.01); G01N 2201/0636 (2013.01)] 9 Claims
OG exemplary drawing
 
1. An optical measurement device for measuring turbidity of a liquid sample by measuring scattered light scattered by the liquid sample, the optical measurement device comprising:
a cell that accommodates the liquid sample;
a transmitted light measurement light source that irradiates the liquid sample in the cell with light for measuring transmitted light;
a scattered light measurement light source that irradiates the liquid sample in the cell with light for measuring scattered light;
a photodetector that detects transmitted light of the light for measuring transmitted light and scattered light of the light for measuring scattered light; and
a reflection mirror that is provided in the cell and reflects the light for measuring transmitted light in the cell to cause the light for measuring transmitted light to be directed to the photodetector,
wherein the scattered light measurement light source emits the light for measuring scattered light toward a post-reflection optical path that is an optical path of the light for transmitted light reflected by the reflection mirror and directed to the photodetector so that the light for measuring scattered light intersects the post-reflection optical path at a predetermined angle, and
wherein a surface of an inner surface of the cell facing the scattered light measurement light source is shaped to not reflect the light for measuring scattered light toward the photodetector.