用超声波检测二元混合气体浓度的算法研究

Study on Algorithms of Detecting Binary GAS Concentration by Ultrasonic

根据文献关于二元混合气体浓度、温度与声速的理论关系,以空气中的SF6为例,通过近似处理得到了一个简洁的关于SF6浓度、温度与声速的关系式.提出了使用两对超声换能器的设想,使得只要测量出超声波在两对超声换能器之间的传播时间,就可以根据本文的工作快速地得到目标气体的浓度,而不必考虑温度的影响.在单片机或嵌入式环境中,通过本文的工作,可以极大的提高数据处理的速度与效率,计算结果的误差小于1%.

Based on the theory of binary gas concentration, temperature and velocity in literature, taking SF6 in the air as an example, a simplified relation between SF6＇s concentration, temperature and veloci- ty is obtained through approximate deal. This paper presents a tentative idea through using two pairs of ultrasonic transducer to detect gas concentration, which can quickly obtain object gas＇ concentration and not taking account of temperature. Our work can greatly improve data--processing speed and efficiency in single-chip or embedded hardware environment, and the computed results＇ error is less than 1%.