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Application of wavelet transform in pulsed ultrasonic modulation voltammetry

机译:小波变换在脉冲超声调制伏安法中的应用

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In this study, wavelet transform was employed to achieve the different current components in pulsed ultrasonic modulation voltammetry. It was found that the pulsed sonovoltammograms could be decomposed into wavelet approximations and wavelet details by projecting wavelet transform on the signals in question. Since wavelet approximations with a certain scale parameter may retain the waveform of the original signal, the current components resulted from ultrasound "on" and "off" in pulsed sonovoltammograms could be separated at a certain scale parameter in multiplying wavelet approximation. With this method, the current components corresponding to pulse-on and pulse-off can be recorded separately without the external data acquisition system used in general modulation voltammetric measurements. The current difference between the two states was found to be proportional to the concentration of the electroactive species. The analytical usefulness of this approach was exploited for determination of ferrocyanide ion at sub-micromolar concentrations. (c) 2005 Elsevier B,V. All rights reserved.
机译:在这项研究中,小波变换被用来实现脉冲超声调制伏安法中的不同电流分量。已经发现,通过将小波变换投影到所讨论的信号上,可以将脉冲超声伏安图分解为小波逼近和小波细节。由于具有一定比例参数的小波逼近可以保留原始信号的波形,因此,在与超声小波逼近相乘的一定比例参数下,脉冲超声伏安图的超声“开”和“关”产生的电流分量可以分开。使用这种方法,可以分别记录对应于脉冲接通和脉冲断开的电流分量,而无需在一般调制伏安测量中使用外部数据采集系统。发现两种状态之间的电流差与电活性物质的浓度成正比。该方法的分析实用性可用于测定亚微摩尔浓度的亚铁氰化物离子。 (c)2005 Elsevier B,V。版权所有。

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