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A versatile system for arbitrary function large-amplitude fourier transformed voltammetry

机译：适用于任意功能大振幅傅立叶变换伏安法的通用系统

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A novel low-cost instrument for arbitrary function large-amplitude Fourier transformed voltammetry was developed. Description of both hardware and software was given in detail in this paper. A micro-control-unit (MCU) in combination with a field programmable gate array (FPGA) was designed to act as the controller of the instrument. Profiting from the built-in USB2.0 standard interface of the MCU, vast amount of data to/from the high resolution digital-to-analog converter (DAC)/analog-to-digital converter (ADC) then could be exchanged with computer in real-time, instead of being temporarily stored at the capacity limited memory of the instrument which always restricted the length of sampling time and the size of the collected data set. In the [Fe(CN)(6)](4+/3+) system, by superimposing a sinusoidal waveform with an amplitude of 120 mV onto a triangular potential and then applying to a macro electrode through the instrument, voltammograms up to the eighth harmonic could be well resolved by FT-IFT method. Excellent agreement was attained with Bond's similar experiment [Anal. Chem. 76 (2004) 3619] in respect of the shape and relative peak height of each harmonic. With the simply structured instrument, stable performance, flexible and versatile function was achieved. Arbitrary forms of AC perturbation which may not necessarily be sinusoidal or square-wave or other regular formed periodic signal could be synthesized and superimposed onto a DC potential as the excitation signal with this instrument. Some more useful electrode process information was expected to unveil by utilizing the FT-IFT algorithm to dissect the response signal.
机译：开发了一种新颖的低成本仪器，用于任意功能大振幅傅立叶变换伏安法。本文详细介绍了硬件和软件。设计了一个微控制单元（MCU）与一个现场可编程门阵列（FPGA）结合，用作仪器的控制器。受益于MCU的内置USB2.0标准接口，往来于高分辨率数模转换器（DAC）/模数转换器（ADC）的大量数据可以与计算机交换。实时，而不是暂时存储在仪器的容量有限的存储器中，这总是会限制采样时间的长度和所收集数据集的大小。在[Fe（CN）（6）]（4 + / 3 +）系统中，通过将振幅为120 mV的正弦波形叠加到三角电位上，然后通过仪器将其施加到宏电极上，伏安图直到FT-IFT方法可以很好地解决八次谐波。与邦德的类似实验[Anal。化学[76（2004）3619]就每个谐波的形状和相对峰高而言。使用结构简单的仪器，可以实现稳定的性能，灵活而通用的功能。可以将不一定是正弦波或方波或其他规则形成的周期信号的任意形式的AC扰动合成，并用该仪器叠加到直流电势上作为激励信号。有望通过利用FT-IFT算法剖析响应信号来揭示一些更有用的电极工艺信息。

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