METHOD OF CREATING A MICROPHONE BASED ON SELECTIVE ABSORPTION OF INFRARED RADIATION BY CARBON DIOXIDE IN ATMOSPHERIC AIR Russian patent published in 2018 - IPC H04R23/00 G01N21/3504 

FIELD: acoustics.

SUBSTANCE: invention relates to acoustics, especially to microphones. Method of creating a microphone based on the selective absorption of infrared (IR) radiation by carbon dioxide. In this case, the IR emitter is used in the wavelength range λ_{by a pose} = 2.64÷2.87 mcm at the emitter power, which provides the ratio of the number of generated quanta of light λ_{by a pose} to the number of molecules of carbon dioxide within the volume of the emitting beam on the path, the emitter-receiver in the form of an inequality the detectability of the IR receiver is not worse than 5⋅10⁹W^-1⋅Hz^1/2⋅cm. Interference filter with a bandwidth of 40 nm and an emission factor of at least 0.7 is set at the input of the IR receiver. By the zero of the measurement readout a signal is usually received. This signal is recorded at normal atmospheric pressure and under the conditions that pressures above atmospheric are measured at a transmitter-receiver distance of not more than 1 cm, and the pressure below atmospheric is measured at a distance of not less than 10 cm, and the IR emitter is provided with a focusing lens.

EFFECT: technical result is an increase in efficiency, expansion of the range of measured pressures.

1 cl, 3 dwg, 4 tbl