公开(公告)号：EP2179271B1

公开(公告)日：2014-09-10

申请号：EP08796724.6

申请日：2008-07-28

Applicant: SpectraSensors, Inc.

Inventor： FEITISCH, Alfred ,  LIU, Xiang ,  ZHOU, Xin ,  LANGHAM, Dale ,  COOK, Charles, F.

IPC: G01N21/35 ,  G01N21/39 ,  G01N21/75

CPC classification number: G01N21/39 ,  G01N21/3504 ,  G01N21/75 ,  G01N2021/399 ,  Y10T436/20 ,  Y10T436/204998

公开(公告)号：EP2122328A1

公开(公告)日：2009-11-25

申请号：EP08732189.9

申请日：2008-03-14

Applicant: SpectraSensors, Inc.

Inventor： XIANG, Liu ,  ZHOU, Xin ,  FEITISCH, Alfred ,  SANGER, Gregory, M.

IPC: G01N21/39 ,  G01N21/35 ,  G01J3/433

CPC classification number: G01N21/39 ,  G01J3/433 ,  G01N21/3504 ,  G01N2021/3513 ,  G01N2021/354 ,  G01N2021/399 ,  G01N2201/1218

Abstract: A system includes a light source, a detector, at least one pressure sensor, and a control unit. The light source emits light at a wavelength substantially corresponding to an absorption line of a target gas. The detector is positioned to detect the intensity of light emitted from the light source that has passed through the target gas. The pressure sensor detects the pressure of the target gas. The control circuit is coupled to the detector and the light source to adjust the modulation amplitude of the light source based on the pressure detected by the at least one pressure sensor. Related systems, apparatus, methods, and/or articles are also described.

公开(公告)号：EP2018539A1

公开(公告)日：2009-01-28

申请号：EP07775840.7

申请日：2007-04-19

Applicant: SpectraSensors, Inc.

Inventor： ZHOU, Xin

IPC: G01N21/35 ,  G01N21/39

CPC classification number: G01N21/3554 ,  G01J3/02 ,  G01J3/027 ,  G01J3/42 ,  G01J3/4338 ,  G01N21/031 ,  G01N21/0332 ,  G01N21/3504 ,  G01N21/39 ,  G01N33/0036 ,  G01N33/22

Abstract: Low concentrations of water vapor within a background of one or more hydrocarbon gases may be detected and quantified using a differential absorption spectrometer. A dehydrated sample of the gas is used as a background sample whose absorption spectrum allows elimination of absorption features not due to water vapor in the gas. Absorption spectra may recorded using tunable diode lasers as the light source, these lasers may have a wavelength bandwidth that is narrower than the water vapor absorption feature used for the differential absorption spectral analysis.