基于LabVIEW伏安型电子舌系统激励信号源的设计与实现

Design and Realization of Excitation Signal Source in Voltammetric Electronic Tongue System Based on LabVIEW

摘要:

伏安型电子舌系统最大优点是测量方法的多样性,它主要靠激励信号的多样性来实现;但是伏安型电子舌系统所需的大部分激励信号在电化学工作站中无法实现;文章利用虚拟仪器技术,采用数据采集卡USB-6008结合LabVIEW软件,针对伏安型电子舌系统的需求,设计一种多功能的激励信号发生器,主要实现了电压范围0~0.5 V,步进电压0.1 V,频率分别为1 Hz、10 Hz和100 Hz的复频调幅脉冲；电压范围0~0.8 V, 步进为0.1 V的大幅脉冲、小幅脉冲、阶梯波脉冲和电压范围为0~1.2 V的三角波;详细论述了不同波形产生和实现过程;测试结果显示:该激励信号发生器产生的波形稳定,方式灵活,适应于便携式伏安型电子舌测试系统。

Abstract:

One of main advantages of voltammetric electronic tongue system is the diversity of measurement method, which depends on the multiple excitation signals. Most test excitation signals used in voltammetric electronic tongue system can not be implemented in an electrochemical workstation. In this paper, by using virtual instrument technology, USB-6008 data acquisition card is adopted combining with LabVIEW software to design a versatile excitation signal generator. Multi-frequency multi-amplitude pulse with the voltage range of 0~0.5 V, step voltage of 0.1 V, and frequency of 1 Hz,10 Hz,100 Hz; large amplitude pulse voltammetry, small amplitude pulse voltammetry, staircase pulse, with the same voltage range 0~0.8 V, step voltage of 0.1 V; and triangle voltammetry of voltage range 0~1.2 V are realized and the design processes of different waveforms are discussed in detail. The results show these waveforms are stable and flexible, which is suitable for voltammetric electronic tongue system. 