G - Physics – 01 – N
Patent
G - Physics
01
N
G01N 21/31 (2006.01) G01N 21/39 (2006.01)
Patent
CA 2279561
A gas detector, comprising a laser transmitter, a laser receiver, a gas reference cell formed of a sealed encircling wall defining an interior volume, a liquid partially filling the gas reference cell, a reference gas dissolved in the liquid and forming a vapor within the interior volume, at least a portion of the sealed encircling wall being transparent to electromagnetic radiation emitted by the laser transmitter to permit electromagnetic radiation to enter the gas reference cell, traverse a path through the vapor and exit the gas reference cell; and the laser transmitter, laser receiver and gas reference cell being coupled together with light guiding elements to form light paths that pass from the laser transmitter to the laser receiver through the gas reference cell and from the laser transmitter to the laser receiver through a target zone. A method of detecting a target gas, the method comprising the steps directing laser light from a laser transmitter to a laser receiver through a target zone and through a gas reference cell containing a sample of the target gas, wherein the gas reference cell contains a liquid in which the target gas is partially dissolved; detecting light from the laser transmitter that has passed through the target zone and light from the laser transmitter that has passed through the gas reference cell; and analyzing the detected light for the presence of the target gas in the target zone.
Lambert Anthony R.
Tulip John
LandOfFree
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