Detection of trace levels of water

G - Physics – 01 – N

Patent

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Details

G01N 33/18 (2006.01) G01N 29/02 (2006.01) G01N 29/24 (2006.01) G01N 33/28 (2006.01)

Patent

CA 2432130

Methods and apparatuses for detecting low levels of a substance of interest in a sample using photoacoustic spectroscopy are provided. This method comprises exciting the sample with light having a wavelength that is absorbed by the substance of interest; generating an acoustic wave within the sample, detecting the acoustic wave, and determining the amount of the substance of interest present in the sample. The method can be used to detect the amount of water in an oil sample at detection limits lower than currently available.

L'invention porte sur des procédés et appareils de détection de faibles niveaux de substances d'intérêt dans des échantillons par spectroscopie photoacoustique. Le procédé consiste à: exciter l'échantillon par de la lumière dont la longueur d'onde correspond à celle d'absorption de la substance d'intérêt; produire une onde acoustique dans l'échantillon; et déterminer la quantité de substance d'intérêt présente dans l'échantillon. Le procédé peut notamment permettre de détecter la quantité d'eau présente dans un échantillon d'huile avec une limite de détection plus basse que celles actuellement disponibles.

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