公开(公告)号：US20190271636A1

公开(公告)日：2019-09-05

申请号：US16320002

申请日：2017-07-25

Applicant: TOKUSHIMA UNIVERSITY ,  FUJIKIN INCORPORATED

Inventor： Yoshihiro DEGUCHI ,  Takashi FUKAWA ,  Taiki HATTORI ,  Masaaki NAGASE ,  Kazuteru TANAKA ,  Kouji NISHINO ,  Nobukazu IKEDA

IPC: G01N21/05 ,  G01N21/59 ,  G01N21/03

Abstract: A concentration measuring device includes a measuring cell having a flow passage and a translucent window, a light source for emitting light to the measuring cell through the window, a reflective member for reflecting light propagating through the measuring cell to the window, a light detector for detecting the light exiting from the window, a calculation part for calculating the concentration of the fluid on the basis of a detection signal from the light detector, and an optical device for guiding the light from the light source to the window and guiding the light from the window to the light detector.

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.