公开(公告)号：US20240288361A1

公开(公告)日：2024-08-29

申请号：US18568691

申请日：2022-06-29

Applicant: FUJIKIN INCORPORATED

Inventor： Masaaki NAGASE ,  Hidekazu ISHII ,  Kosuke SUGIMOTO ,  Takashi FUKAWA ,  Wataru ASHINO

IPC: G01N21/31 ,  G01N21/03 ,  G01N21/25 ,  G01N21/85

CPC classification number: G01N21/31 ,  G01N21/0303 ,  G01N21/255 ,  G01N21/85 ,  G01N2021/0389 ,  G01N2021/8578 ,  G01N2201/0638

Abstract: Provided is a concentration measurement device that can be miniaturized without using an optical fiber. The concentration measurement device including a measurement cell having a gas flow path and an optical path intersecting the gas flow path; a light source for emitting light inside the optical path, the light source 14 being installed at one end of the optical path; a first photodetector for detecting a light emitted from the light source as a reference light, the first photodetector being installed at a side of the light source and rearward from a distal end of the light source in a light emitting direction along an optical axis of the light source; a second photodetector for detecting a light emitted from the light source for measuring light absorption, the second photodetector being installed at another end of the optical path.