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《Journal of Tianjin Polytechnic University》 2015-05
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Level detection of two-phase liquid in sealed container

WANG Ping;LIU Yao;WAN Kai;School of Electrical Engineering and Automation,Tianjin Polytechnic University;School of Information Science and Technology,Sun Yat-sen University;  
Liquid level of oil and water in sealed container as detecting object, an ultrasonic level measurement system based on the cross-correlation algorithm is designed. Taking C8051F120 as control kernel, the hardware architecture is mainly composed of ultrasonic transmitting and receiving circuit, weak echo signal conditioning circuit and so on. The echo signal is extracted from strong noise by cross-correlation algorithm. Oil and water level are measured through calculating time of flight in accordance with the peak of cross-correlated function. In the upper computer, the dynamic link library of Matlab is called by Visual Basic interface to realize the pocessing of noise interference and improve the recognition rate of useful signal. The experimental results show that the measurement accuracy of the system can be controlled at around 1%, and the system has the characteristics of simple realization, high stability, good repeatablity, etc.
【Fund】: 国家自然科学基金面上项目(61372011)
【CateGory Index】: TP274.53
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