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Title:: Frequency analysis on magneto-acoustic signal excited by modulated pulses with Gaussian envelope

Author(s):: ZHANG Xinshan; YANG Ming; ZHANG Wei; ZHANG Shunqi; MA Ren; YIN Tao; LIU Zhipeng; Institute of Biomedical Engineering，Chinese Academy of Medical Sciences & Peking Union Medical College，Tianjin 300192，China

Keywords:: Magneto-acoustic signal; Single pulse; Gaussian envelope; Conductivity; Frequency characteristic

摘要:: 本研究旨在探究基于高斯包络调制激励下，感应式磁声成像中磁声信号的频率特性。先使用4 MHz单正弦脉冲信号和中心频率为4 MHz的高斯包络调制信号，对不同电导率样本（铝、铜、锡）进行激励，使用中心频率为4 MHz的超声换能器进行接收，并对接收到的磁声信号进行频率分析。单脉冲激励方式造成磁声信号频率分析失准，基于高斯包络调制激励的磁声信号与激励信号频率一致。样本磁声信号与激励信号同频，且高斯包络调制激励方法使频率分析精度更高，频谱更为集中，更利于频域中信号特征的分析。

Abstract:: To explore the frequency characteristics of magneto-acoustic signals in induction magneto-acoustic imaging based on Gaussian envelope-modulation excitation. The 4 MHz single-sine pulse signal and the Gaussian envelope-modulated signal featuring a center frequency of 4 MHz were used to excite samples (aluminum, copper, tin) of different electrical conductivities, an ultrasonic transducer of the center frequency of 4 MHz was introduced as the receiver and then the received magneto-acoustic signals was analyzed. The single-pulse excitation mode resulted in a misaligned frequency analysis of magneto-acoustic signals, while the magneto-acoustic signals based on Gaussian envelope-modulation excitation were of the same frequency with the excitation signal.Sample′s magneto-acoustic signals are of the same frequency with excitation signals; moreover, the method of Gaussian envelope-modulation excitation realizes a higher precision of frequency analysis and a more centralized spectrum, for which it is more conducive to the analysis of frequency characteristics within a frequency domain.