Use of the thermal wave method for measuring the flow velocity of air and carbon dioxide mixture

In the paper the use of the thermal wave method for measuring flow velocity of air and carbon dioxide mixture is described. The research was conducted using a moving probe, placed in a closed chamber. A parallel configuration of the transmitter-detector configuration, with two wave detectors, was applied. A rectangular wave of 4 Hz frequency was generated. By the use of the Fourier transform, the velocity of signals from the wave detectors was determined. Results for velocity of 10-50 cm/s and carbon dioxide concentration up to 50% are shown in the paper.