公开(公告)号：US11650155B2

公开(公告)日：2023-05-16

申请号：US17390074

申请日：2021-07-30

Applicant: YOKOGAWA ELECTRIC CORPORATION

Inventor： Yuta Suzuki ,  Yuma Kitagawa ,  Toshiyuki Saruya ,  Nobuhiko Kanbara

IPC: G01N21/61

CPC classification number: G01N21/61 ,  G01N2201/068 ,  G01N2201/0612 ,  G01N2201/121

Abstract: A gas analysis system, includes: a light-emitting element that emits a laser light modulated by a predetermined modulation frequency; and a light-receiving element that: receives the laser light that has passed through a measurement target gas; and upon receiving the laser light, outputs a received signal having an N-frequency that is n times the predetermined modulation frequency, wherein n is an integer no less than 2; and a signal processing device that: calculates a third component by removing, from a first component having the N-frequency, a second component, wherein the second component is a component of optical interference noise arising on an optical path of the laser light from the light-emitting element to the light-receiving element and has the same frequency as the first component; and calculates, based on a magnitude of the third component, a concentration of the measurement target gas.

公开(公告)号：US20220034807A1

公开(公告)日：2022-02-03

申请号：US17390074

申请日：2021-07-30

Applicant: YOKOGAWA ELECTRIC CORPORATION

Inventor： Yuta Suzuki ,  Yuma Kitagawa ,  Toshiyuki Saruya ,  Nobuhiko Kanbara

IPC: G01N21/61

Abstract: A gas analysis system, includes: a light-emitting element that emits a laser light modulated by a predetermined modulation frequency; and a light-receiving element that: receives the laser light that has passed through a measurement target gas; and upon receiving the laser light, outputs a received signal having an N-frequency that is n times the predetermined modulation frequency, wherein n is an integer no less than 2; and a signal processing device that: calculates a third component by removing, from a first component having the N-frequency, a second component, wherein the second component is a component of optical interference noise arising on an optical path of the laser light from the light-emitting element to the light-receiving element and has the same frequency as the first component; and calculates, based on a magnitude of the third component, a concentration of the measurement target gas.