声表面波式指宽变长小波变换处理器的设计

发布时间：2018-01-14 19:23

本文关键词：声表面波式指宽变长小波变换处理器的设计　出处：《压电与声光》2017年02期 　论文类型：期刊论文

【摘要】：为消除声表面波式小波变换处理器压电基片对频率特性的影响,以及输出换能器的指条数对带宽的影响和解决衍射问题,研制了声表面波式指宽变长小波变换处理器。该处理器选取机电耦合系数为0.64%的X-112°Y LiTaO_3压电基片,输出换能器指条数为36,输入换能器采用指宽变长且声孔径均匀的叉指换能器。设计和制作了尺度2-2声表面波式指宽变长小波变换处理器样品。实验结果表明,声表面波式指宽变长小波变换处理器频率特性曲线光滑,-3dB实验带宽为1.072 MHz,与理论带宽值一致,且不存在衍射问题。
[Abstract]:In order to eliminate the influence of the piezoelectric substrate on the frequency characteristics of saw wavelet transform processor, and the influence of the number of fingers of the output transducer on the bandwidth and to solve the diffraction problem. A surface acoustic wave (saw) wavelet transform processor with varying finger width is developed, which selects X-112 掳Y LiTaO_3 piezoelectric substrate with electromechanical coupling coefficient of 0.64%. Output transducer refers to 36 bars. The input transducer uses a cross finger transducer with varying finger width and uniform acoustical aperture. The 2-2 saw wavelet transform sample is designed and fabricated. The experimental results show that the proposed method is effective. The frequency characteristic curve of saw signal width varying length wavelet transform processor is smooth and the experimental bandwidth is 1.072 MHz, which is consistent with the theoretical bandwidth, and there is no diffraction problem.
【作者单位】：东华大学信息科学与技术学院;
【基金】：国家自然科学基金资助项目(61274078) 纺织之光应用基础基金资助项目(J201608) 高等学校博士创新基金资助项目(CUSFDH-D-2015061)
【分类号】：TP332
【正文快照】： 0引言小波变换[1-3]将信号分解为一系列小波函数的叠加,是对时间(空间)频率的局部化分析,通过伸缩平移运算对信号逐步进行多尺度细化,从而达到高频处时间细分,低频处频率细分,因此,可高效地从大量信号中提取有效信息。小波变换理论在应用数学和工程学科中得到了快速发展与应用

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