RESONANT DIFFERENTIAL OPTICAL-ACOUSTIC DETECTOR Russian patent published in 2021 - IPC G01N21/00 

FIELD: instrument engineering.

SUBSTANCE: invention can be used in gas composition analysis. The essence of the invention lies in the fact that the resonant differential optical-acoustic detector includes two independent open acoustic resonators made in the form of straight tubes of circular cross-section, located parallel to each other and connected at the ends with the input and output buffer cavities, while the acoustic resonators are cylindrical in diameter D₁ and length L₁ and separated by a partition thickness t, microphones are mounted on the side walls in the middle of each acoustic resonator, a sound emitter is mounted in the middle of one of the acoustic resonators opposite the microphone, the input and output buffer cavities are made identical cylindrical in diameter D₂ and length L₂, the ends of the acoustic resonators are connected to buffer cavities, and the diameter of the buffer cavities depends in a certain way on the diameter of the acoustic resonators and the thickness of the partition separating the acoustic resonators, the length of the buffer cavities L₂ is (1…1.5)×D₁, the ends of the buffer cavities are closed with transparent windows, and devices for the input/output of the analyzed gas are mounted on the side walls of the buffer cavities.

EFFECT: expansion of the arsenal of technical means for the analysis of the gas composition of the air.

1 cl, 1 dwg