Papers by Author: Xuan Chao Liu

Abstract: The high power and low frequency electroacoustic transducer plays a very important role in the underground acoustic telemetry system used for petroleum industry. How to realize electroacoustic conversion technology with the giant magnetostrictive materials was studied in this paper. The principles and methods of how to design it were proposed and the experimental verification was achieved. Results show that the electroacoustic transducer based on giant magnetostrictive materials features high-power and low-frequency output, high conversion efficiency, high temperature resistance, and excellent performance. It can completely meet the needs of the downhole acoustic telemetry system.

Abstract: With the change of the human life style, heart disease has become one of the main diseases threatening human life and health. Promptly, accurately and completely achieving electrocardiogram (ECG) signal has vital significance for discovering and treating heart disease as soon as possible. However, the traditional professional electrocardiograph has complex structure, high price, and it is not suitable to carry on the popularization application. Therefore, this article proposes a new type of ECG signal sample and analysis system based on a personal computer, which realizes acquisition and analysis function through the LabVIEW programming. The research result shows that it has not only perfect function, convenient operation, easy to use, but also low price, and it is very suitable to universal application. So, it has very good practical value.