公开(公告)号：US20180120159A1

公开(公告)日：2018-05-03

申请号：US15640119

申请日：2017-06-30

Applicant: SpectraSensors, Inc.

Inventor： XIANG LIU ,  Gary Yeh ,  Adam S. Chaimowitz ,  William Jenko ,  Alfred Feitisch

IPC: G01J3/28

CPC classification number: G01J3/28 ,  G01J2003/283 ,  G01J2003/2866 ,  G01N21/274 ,  G01N21/39

Abstract: A frequency registration deviation is quantified for a field spectrum collected during analysis by a spectroscopic analysis system of a sample fluid when the spectroscopic analysis system has deviated from a standard calibration state. The field spectrum is corrected based on the frequency registration deviation using at least one spectral shift technique, and a concentration is calculated for at least one analyte represented by the field spectrum using the corrected field spectrum. Related systems, methods, and articles are described.

公开(公告)号：AU2008242467B2

公开(公告)日：2011-09-29

申请号：AU2008242467

申请日：2008-01-24

Applicant: SPECTRASENSORS INC

Inventor： ALFRED FEITISCH ,  SANGER GREGORY M ,  XIANG LIU ,  XIN ZHOU

IPC: G01N21/31 ,  G01N21/35 ,  G01N21/39

Abstract: Concentrations of a target analyte in a gas mixture containing one or more background analytes having potentially interfering spectral absorption features can be calculated by compensating for background analyte absorption at a target wavelength used to quantify the target analyte. Absorption can be measured at a reference wavelength (302) chosen to quantify the concentration of the background analyte. Using a background gas adjustment factor or function, the absorption measured at the reference wavelength can be used to calculate absorption due to the background analyte at the target wavelength (304) and thereby compensate for this background absorption to more accurately calculate the target analyte concentration in real or near real time (306). Additional background analytes can optionally be compensated for by using one or more additional reference wavelengths.

公开(公告)号：CA2680798A1

公开(公告)日：2008-09-18

申请号：CA2680798

申请日：2008-03-14

Applicant: SPECTRASENSORS INC

Inventor： SANGER GREGORY M ,  ZHOU XIN ,  XIANG LIU ,  FEITISCH ALFRED

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

Abstract: An apparatus for detecting a concentration of a trace target gas in a sam ple gas comprises a light source (110), for example a tunable diode laser, f or emitting light at a wavelength corresponding to an absorption line of the target gas and means (105) operatively connected to said light source for m odulating the wavelength of the emitted light, a detector (125) positioned t o detect the intensity of light emitted from the light source that has passe d through the sample gas at a multiple of the modulation frequency of the li ght source, for example second harmonic detection, a pressure sensor (120) f or detecting the pressure of the sample gas, and a control unit (135) couple d to the detector, the pressure sensor, and the light source, said control u nit being arranged to adjust the modulation amplitude' of the light source b ased on the detected pressure.

公开(公告)号：AU2008224897A1

公开(公告)日：2008-09-18

申请号：AU2008224897

申请日：2008-03-14

Applicant: SPECTRASENSORS INC

Inventor： SANGER GREGORY M ,  FEITISCH ALFRED ,  XIANG LIU ,  ZHOU XIN

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

公开(公告)号：CA2680798C

公开(公告)日：2017-05-02

申请号：CA2680798

申请日：2008-03-14

Applicant: SPECTRASENSORS INC

Inventor： XIANG LIU ,  ZHOU XIN ,  FEITISCH ALFRED ,  SANGER GREGORY M

IPC: G01J3/433

Abstract: An apparatus for detecting a concentration of a trace target gas in a sample gas comprises a light source (110), for example a tunable diode laser, for emitting light at a wavelength corresponding to an absorption line of the target gas and means (105) operatively connected to said light source for modulating the wavelength of the emitted light, a detector (125) positioned to detect the intensity of light emitted from the light source that has passed through the sample gas at a multiple of the modulation frequency of the light source, for example second harmonic detection, a pressure sensor (120) for detecting the pressure of the sample gas, and a control unit (135) coupled to the detector, the pressure sensor, and the light source, said control unit being arranged to adjust the modulation amplitude' of the light source based on the detected pressure.