Acoustic sensing method for detecting concentration ratio of mixed gas

• Main Authors: LUO HAIFENG, DAI WEI, LIU TINGTING, LIU YONG, WANG HUAIXING
• Format: Patent
• Language: Chinese; English
• Published: 04.06.2021
• Subjects: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES; MEASURING; PHYSICS; TESTING

The invention discloses an acoustic sensing method for detecting the concentration ratio of mixed gas. The method comprises the following steps: s1, the correlation formula of relaxation intensity epsilon and relaxation time tau about sound wave angular frequency omega, sound velocity c and sound relaxation absorption coefficient value alpha r is deducted; s2, the correlation curves of the gas concentration percentage and reciprocals of the relaxation intensity and the relaxation time are drawn; s3, the dot frequency ultrasonic transducer detects the mixture to be detected at the two frequency points to obtain acoustic characteristic values of the mixture, the relaxation intensity and the reciprocal of the relaxation time of the gas are obtained according to a correlation formula, and the corresponding concentration percentage is found on the corresponding correlation curve obtained in the step s2. According to the invention, effective real-time gas detection is realized by utilizing two simple characteristic