LASER OPTICAL-ACOUSTIC GAS ANALYZER AND RESONANT DIFFERENTIAL OPTICAL-ACOUSTIC DETECTOR Russian patent published in 2021 - IPC G01N21/00 

FIELD: gas composition analyzers.

SUBSTANCE: invention relates to gas composition analyzers. Disclosed is a laser optical-acoustic gas analyzer which includes a series-installed laser with modulation of the radiation power, a gas-filled optical-acoustic cell with a constant concentration of the marker gas through which the laser radiation passes, and a resonant optical-acoustic detector. According to the proposed invention, the gas analyzer is equipped with an air pump and an additional resonant OAD with a small optical length of ~ 0.5-1 mm installed between the gas-filled optical-acoustic cell and the main OAD. The gas-filled optical-acoustic cell and the main and additional OAD are equipped with microphones. The main and additional OAD are connected by an air duct so that a sample of the analyzed air arrives at the input of the additional OAD and the output of the additional OAD is connected to the inlet of the main OAD, the output of the main OAD is connected to the air pump, and the pump head provides the air circulation rate at which the mode of flow of the analyzed gas through the optical-acoustic detectors is laminar.

EFFECT: expanding the range of technical means for analyzing the gas composition of air.

4 cl, 2 dwg