The Design of Gas Concentration Detection System Based on Acoustic Relaxation Method

The concentration detection of the mixed gas is significant to operate safely and efficiently as well as reduce the emission of pollutants. In this paper, a concentration detection system based on acoustic relaxation attenuation is designed in order to reconstruct the three-dimensional images. The system is based on FPGA, supplemented by other hardware circuits. The consists of the system, the choice of the ultrasonic transducer, the calculation of amplifier magnification, and the specific design of circuit are elaborated in the paper. Experiments certificate that the hardware system can measure the attenuation intensity and flight time of ultrasonic waves in real time accurately. It is the base to detect the concentration of the gas mixture.