公开(公告)号：AU2011223628A2

公开(公告)日：2012-10-25

申请号：AU2011223628

申请日：2011-03-02

Applicant: LI COR INC

Inventor： KACHANOV ALEXANDER ,  KOULIKOV SERGUEI

IPC: G01N21/00

Abstract: A method and apparatus for the photo-acoustic identification and quantification of one or more analyte species present in a gaseous or liquid medium in low concentration utilizing a laser and a resonant optical cavity containing the medium and having within the cavity at least two partially transparent mirrors, one of which is a cavity coupling mirror and one of which is moveably mounted on an assembly responsive to an input signal.

公开(公告)号：EP2748585A4

公开(公告)日：2015-05-27

申请号：EP11871369

申请日：2011-08-26

Applicant: LI COR INC

Inventor： KOULIKOV SERGUEI ,  KACHANOV ALEXANDER

IPC: G01N21/31 ,  G01J3/02 ,  G01J3/42 ,  G01N21/03 ,  G01N21/27 ,  G01N21/39

CPC classification number: G01N21/39 ,  G01J3/021 ,  G01J3/42 ,  G01N21/031

Abstract: Cavity enhanced absorption spectroscopy systems and methods for detecting trace gases. When the frequency of laser light approaches the frequency of a resonance cavity mode, the laser begins to fill the cavity to that mode. Optical intensity inside the cavity reflects total cavity loss when the laser light frequency coincides with the cavity mode transmission peak. The intra-cavity optical power also depends on the coupling efficiency of the laser beam to the particular cavity mode. Measurement of intensities of three optical signals, namely, intensity of the light incident on to the cavity, intensity of the light reflected from the cavity, and intensity of the intra-cavity optical power, with their appropriate normalization advantageously significantly reduce effects of baseline calibration and drift as the normalized signal only depends on total cavity loss, and not the coupling efficiency, as in traditional approaches.

公开(公告)号：AU2011223628A1

公开(公告)日：2012-10-18

申请号：AU2011223628

申请日：2011-03-02

Applicant: LI COR INC

Inventor： KACHANOV ALEXANDER ,  KOULIKOV SERGUEI

IPC: G01N21/00

Abstract: A method and apparatus for the photo-acoustic identification and quantification of one or more analyte species present in a gaseous or liquid medium in low concentration utilizing a laser and a resonant optical cavity containing the medium and having within the cavity at least two partially transparent mirrors, one of which is a cavity coupling mirror and one of which is moveably mounted on an assembly responsive to an input signal.

公开(公告)号：EP2542876A4

公开(公告)日：2017-12-20

申请号：EP11751318

申请日：2011-03-02

Applicant: LI-COR INC

Inventor： KACHANOV ALEXANDER ,  KOULIKOV SERGUEI

IPC: G01N21/00 ,  G01N21/17 ,  G01N21/39

CPC classification number: G01N21/1702 ,  G01N21/39 ,  G01N2021/1704

Abstract: A method and apparatus for the photo-acoustic identification and quantification of one or more analyte species present in a gaseous or liquid medium in low concentration utilizing a laser and a resonant optical cavity containing the medium and having within the cavity at least two partially transparent mirrors, one of which is a cavity coupling mirror and one of which is moveably mounted on an assembly responsive to an input signal.

公开(公告)号：EP2745097A4

公开(公告)日：2015-05-06

申请号：EP12823968

申请日：2012-08-17

Applicant: LI COR INC

Inventor： KOULIKOV SERGUEI ,  KACHANOV ALEXANDER

IPC: G01N21/39 ,  G01J3/433 ,  G01N21/17 ,  G01N21/61 ,  G01N29/24

CPC classification number: G01N21/39 ,  G01J3/4338 ,  G01N21/1702 ,  G01N21/59 ,  G01N21/61 ,  G01N29/2425 ,  G01N2021/1704 ,  G01N2201/023 ,  G01N2201/06113 ,  G01N2291/021

Abstract: Systems and methods for measuring the isotope ratio of one or more trace gases and/or components of gas mixtures such as different gas species present in a gas mixture. The system includes a resonant optical cavity having two or more mirrors and containing a gas, the cavity having a free spectral range that equals the difference between frequencies of two measured absorption lines of different gas species in the gas, or of two different isotopes, divided onto an integer number. The system includes a continuous-wave tunable laser optically coupled with the resonant optical cavity and a detector system for measuring an absorption of laser light by the gas in the cavity. The detector system includes a photo-detector to measure an intensity of the intra-cavity light, or both a photo-acoustic sensor to measure photo-acoustic waves generated in the cavity and a photo-detector to measure an intensity of the intra-cavity light.