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    • 1. 发明公开
    • MAGNETOSTRICTIVE WAVEGUIDE DETECTION SIGNAL PROCESSING METHOD AND DEVICE
    • VERFAHREN UND VORRICHTUNGFÜRMAGNETOSTRIKTIVE WELLENLEITERDETEKTIONSSIGNALVERARBEITUNG
    • EP3088882A4
    • 2017-08-02
    • EP14841923
    • 2014-06-12
    • UNIV HUAZHONG SCIENCE TECH
    • WU XINJUNTANG MINGXISUN PENGFEI
    • G01N27/82G01N29/24G01N29/42G01N29/44G01N29/52
    • G01R21/133G01M99/00G01N27/82G01N29/2412G01N29/42G01N29/4463G01N29/4472G01N29/52G01N2291/0425
    • A magnetostrictive waveguide detection signal processing method and device, the method involving interception of a raw detection signal so as to obtain an analytical signal u(n) and further bandpass filtering to obtain x(n). The excitation signal length is set as L, letting M = [L/4], and R = [M/2]. With an initial i = 0, intercepting data x(i),..., (i+M-1), and building a matrix A wherein R*(M-R+1), then performing singular value decomposition on the matrix so as to obtain a singular matrix B and feature values »; setting to zero » values lower than the median to obtain matrix C, performing a reverse singular transformation on the matrix C to obtain matrix D, and reducing from matrix D a post-processed signal y and calculating the energy z thereof. Letting i = i+1, repeating the steps above until completing calculation of the energies of the post-processed signals of the selected analysis zone, then, on the basis of the distortion characteristics of the energy distribution graph, determining whether any defect is present in the signals. The present method effectively enhances the signal-to-noise ratio in magnetostrictive waveguide detection signals, and detection accuracy.
    • 一种磁致伸缩波导检测信号处理方法及装置,该方法包括截取原始检测信号以获得分析信号u(n)并进一步进行带通滤波以获得x(n)。 激励信号长度设为L,设M = [L / 4],R = [M / 2]。 在初始i = 0时,截取数据x(i),...,(i + M-1),并构建矩阵A,其中R *(M-R + 1),然后对矩阵进行奇异值分解 从而获得奇异矩阵B和特征值»; 设置为低于中值的零值以获得矩阵C,对矩阵C执行逆奇异变换以获得矩阵D,并从矩阵D中减去后处理信号y并计算其能量z。 设i = i + 1,重复上述步骤直到完成所选分析区后处理信号能量的计算,然后根据能量分布图的畸变特性判断是否存在缺陷 在信号中。 本方法有效地提高了磁致伸缩波导检测信号的信噪比和检测精度。
    • 5. 发明公开
    • SENSOR FOR DETECTING SUBSTANCE IN LIQUID
    • 用于检测液体中物质的传感器
    • EP2028484A1
    • 2009-02-25
    • EP07740600.7
    • 2007-03-30
    • Murata Manufacturing Co. Ltd.
    • OKAGUCHI, KenjiroHADA, TakuoKADOTA, Michio
    • G01N29/02
    • G01N29/022G01N2291/014G01N2291/0255G01N2291/0256G01N2291/0423G01N2291/0425
    • Provided is a sensor for detecting a substance in liquid, the sensor being capable of measuring a substance to be detected in liquid with higher sensitivity and reliability.
      A sensor 1 for detecting a substance in liquid includes a sensing oscillation circuit 11 and a reference oscillation circuit 21. The sensing oscillation circuit 11 includes a sensing SAW element 12 in which a reaction film formed so as to cover at least one IDT and to react with a substance in liquid is disposed and a first amplifier circuit 15. The reference oscillation circuit 21 includes a reference SAW element 22 and a second amplifier circuit 25. The reference SAW element 22 includes at least one IDT and no reaction film. The oscillation frequency of the sensing oscillation circuit 11 and the oscillation frequency of the reference oscillation circuit 21 are separated by 200 × k 2 (ppm) or more, where k 2 (%) is the electromechanical coupling coefficient of a piezoelectric substrate used in each of the sensing SAW element and the reference SAW element.
    • 提供一种用于检测液体中的物质的传感器,该传感器能够以更高的灵敏度和可靠性测量液体中待检测的物质。 用于检测液体中的物质的传感器1包括感测振荡电路11和参考振荡电路21.感测振荡电路11包括感测SAW元件12,其中形成反应膜以覆盖至少一个IDT并反应 液体中的物质被布置并且具有第一放大器电路15.参考振荡电路21包括参考SAW元件22和第二放大器电路25.参考SAW元件22包括至少一个IDT并且没有反应膜。 感测用振荡电路11的振荡频率与基准振荡电路21的振荡频率相差200×k2(ppm)以上,其中,k2(%)是在各个压电基板中使用的压电基板的机电耦合系数 感测SAW元件和参考SAW元件。