Abstract: A new way of ethanol gasoline concentration determination is proposed based on the ultrasound phase difference method. The on-line concentration measuring instrument is also designed by the method. When the temperature is 290K and ethanol gasoline volume concentration is at between 3% and 24% , we use the instrument to establish relationship between ethanol gasoline concentration and phase. The experimental results show that the ultrasound concentration measuring instrument can not only measure ethanol volume concentration in ethanol gasoline solution accurately and real-time, hut also come up a new way for measuring vehicle ethanol gasoline and other binary solution accurately.

Key words: ultrasound, phase difference, ethanol -gasoline, concentration, on-line measurement