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《Acta Metrologica Sinica》 2016-01
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A New Improved Orthogonal Correlation Method of Measuring Impedance Angle of Ultrasound Transducer

JI Hua-wei;LI Xu-long;HU Xiao-ping;School of Mechanical Engineering,Hangzhou Dianzi University;  
During the ultrasonic cutting of the cellular composite,the failure of the match between ultrasonic and impedance of transducer leads to the reduce of the quality and efficiency of machining of materials,and even damages ultrasound equipment.The key to solve this problem is that realize the dynamic matching by detecting impedance angle on line and in real time.Based on the relevant principles of orthogonal,a new method to detect the impedance angle is proposed,which is independent with whether to synchronize with the sampling.And this way realizes the on-line detection of impedance angle by using the microprocessors and sensor measuring circuit.Simulation and experiments show that the method is suitable for synchronous and asynchronous sampling of ultrasound signal frequency and lays the foundation for the realization of dynamic matching.Besides,this method needs the small amount of calculation,is real-time and has high accuracy,and specially after the improvements,its error closes to 0.0551°.
【Fund】: 国家自然科学基金(51475130);; 国防科工局重大专项(A3920133001)
【CateGory Index】: TB552
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