公开(公告)号：US11467037B2

公开(公告)日：2022-10-11

申请号：US16838212

申请日：2020-04-02

Applicant: NEC Laboratories America, Inc.

Inventor： Yue Tian ,  Da Pan

IPC: G01J5/60 ,  G01J5/00

Abstract: Aspects of the present disclosure describe rapid temperature measurement by wavelength modulation spectroscopy (WMS) that determines gas temperature from 2ƒ signals from two absorption lines by WMS methodologies even when the gas concentration is sufficiently high to saturate optical absorptions. In sharp contrast to the prior art, rapid temperature measurement by WMS according to aspects of the present disclosure employs both a 2ƒ signal ratio and gas concentration determined from the 2ƒ signal.

公开(公告)号：US20190195789A1

公开(公告)日：2019-06-27

申请号：US16219136

申请日：2018-12-13

Applicant: NEC Laboratories America, Inc.

Inventor： Da Pan ,  Yue Tian ,  Ming-Fang Huang

IPC: G01N21/39 ,  G01J3/433 ,  G01N21/27

CPC classification number: G01J3/433 ,  G01J3/4338 ,  G01N21/274 ,  G01N21/39 ,  G01N2021/399 ,  G01N2201/127

Abstract: A computer-implemented method for measuring gas concentration from a 2f signal in wavelength modulation spectroscopy is presented. The computer-implemented method includes emitting a beam of light from a laser to pass through a gas sample, calculating a gas measurement value from the gas sample via a trough distance calculator using a trough distance of a gas absorption line's 2f signal, calibrating the gas measurement value via a multi-point calibration process, and outputting the gas measurement value to a user interface of a computing device.

公开(公告)号：US10466106B2

公开(公告)日：2019-11-05

申请号：US16219136

申请日：2018-12-13

Applicant: NEC Laboratories America, Inc.

Inventor： Da Pan ,  Yue Tian ,  Ming-Fang Huang

IPC: G01J3/433 ,  G01N21/39 ,  G01N21/27

Abstract: A computer-implemented method for measuring gas concentration from a 2f signal in wavelength modulation spectroscopy is presented. The computer-implemented method includes emitting a beam of light from a laser to pass through a gas sample, calculating a gas measurement value from the gas sample via a trough distance calculator using a trough distance of a gas absorption line's 2f signal, calibrating the gas measurement value via a multi-point calibration process, and outputting the gas measurement value to a user interface of a computing device.