G - Physics – 01 – N
Patent
G - Physics
01
N
349/48
G01N 21/31 (2006.01) G01N 21/17 (2006.01)
Patent
CA 1318963
ABSTRACT In a method for the detection of a first gas in a gas mixture of said first and second gas, the absorption spectrum of the second gas interfering with the absorption spectrum of the first gas, a photoacoustic measurement is carried out in the presence of a third gas which in combination with the first or the second gas exhibits kinetic cooling. During measurement, the gas mixture is influenced by pulsating laser light having a constant repetition frequency whilst the frequency of the laser light is varied gradually. The measurement comprises at least one detection of the phase of the photoacoustic signal as a function of the laser light frequency. The invention further relates to an apparatus for carrying out the method of the invention.
610758
Hammerich Mads
Henningsen Jes O.
Olafsson Ari
Borden Ladner Gervais Llp
Fls Airloq A/s
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