Measuring and testing – Gas analysis – By vibration
Patent
1997-10-20
1999-06-15
Larkin, Daniel S.
Measuring and testing
Gas analysis
By vibration
73 6149, 73 6179, 25033913, 356 51, 356436, 356437, G01N 2117
Patent
active
059132345
ABSTRACT:
A method and apparatus for determining the concentration of a substance of interest by gas-coupled photoacoustic spectroscopy (GC-PAS) with an essentially monochromatic beam of radiation in an optical portion of the electromagnetic spectrum; the radiation is selected so as to be absorbed by the substance of interest and the beam is modulated at a sonic frequency which is sufficiently high for generating a primary signal that depends upon the absorption coefficient of the substance of interest as well as upon parameters of operating the method; in order to compensate for these operating parameters, the beam is additionally modulated at a sonic frequency which is sufficiently low for generating a secondary signal which does not depend upon the absorption coefficient of the substance of interest, but, depends only upon parameters of operating the method; a ratio of the first and the second signal is obtained to generate a compensated signal for determining the concentration of the substance of interest.
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Gisin Nicolas
Julliard Karin
Pellaux Jean-Paul
Larkin Daniel S.
Orbisphere Laboratories Neuchatel S.A.
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