A Compound Detection System Based on Ultrasonic Flow Rate and Concentration

• Main Authors: Qing-Hui WANG, Fang MU, Li-Feng WEI
• Format: Article
• Language: English
• Published: IFSA Publishing, S.L. 2014-02-01
• Series: Sensors & Transducers
• Subjects: Ultrasound; Time difference method; Propagation time; Concentration of oxygen; Gas flow rate; Temperature compensation.
• Online Access: http://www.sensorsportal.com/HTML/DIGEST/february_2014/Vol_164/P_1833.pdf

This paper proposes a new detection system for monitoring gas concentration and flow rate. Velocity difference of ultrasonic wave in bi-directional propagation in measured gas is recorded and utilized for computing the online gas concentration and flow rate. Meanwhile, the temperature compensation, return signal processing and error analysis algorithms are applied to improve the accuracy. The experimental results show that, compared with the single sensor measurement of gas flow rate or concentration, the proposed detection system with lower cost and higher accuracy can be applied in the occasion which needs simultaneous monitoring of gas concentration and flow rate.