本文關(guān)鍵詞：聲表面波式指寬變長(zhǎng)小波變換處理器的設(shè)計(jì)　出處：《壓電與聲光》2017年02期 　論文類型：期刊論文

  更多相關(guān)文章： 聲表面波 小波變換處理器 指寬 衍射 壓電基片 頻率特性 變長(zhǎng)

【摘要】：為消除聲表面波式小波變換處理器壓電基片對(duì)頻率特性的影響,以及輸出換能器的指條數(shù)對(duì)帶寬的影響和解決衍射問題,研制了聲表面波式指寬變長(zhǎng)小波變換處理器。該處理器選取機(jī)電耦合系數(shù)為0.64%的X-112°Y LiTaO_3壓電基片,輸出換能器指條數(shù)為36,輸入換能器采用指寬變長(zhǎng)且聲孔徑均勻的叉指換能器。設(shè)計(jì)和制作了尺度2-2聲表面波式指寬變長(zhǎng)小波變換處理器樣品。實(shí)驗(yàn)結(jié)果表明,聲表面波式指寬變長(zhǎng)小波變換處理器頻率特性曲線光滑,-3dB實(shí)驗(yàn)帶寬為1.072 MHz,與理論帶寬值一致,且不存在衍射問題。
[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 擄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.
【作者單位】： 東華大學(xué)信息科學(xué)與技術(shù)學(xué)院;
【基金】：國(guó)家自然科學(xué)基金資助項(xiàng)目(61274078) 紡織之光應(yīng)用基礎(chǔ)基金資助項(xiàng)目(J201608) 高等學(xué)校博士創(chuàng)新基金資助項(xiàng)目(CUSFDH-D-2015061)
【分類號(hào)】：TP332
【正文快照】： 0引言小波變換[1-3]將信號(hào)分解為一系列小波函數(shù)的疊加,是對(duì)時(shí)間(空間)頻率的局部化分析,通過伸縮平移運(yùn)算對(duì)信號(hào)逐步進(jìn)行多尺度細(xì)化,從而達(dá)到高頻處時(shí)間細(xì)分,低頻處頻率細(xì)分,因此,可高效地從大量信號(hào)中提取有效信息。小波變換理論在應(yīng)用數(shù)學(xué)和工程學(xué)科中得到了快速發(fā)展與應(yīng)用

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