An electronic oscillator with automatic gain control: EQCM applications
An electronic oscillator with automatic gain control: EQCM applications
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DOI：
10.1016/0925-4005(96)80121-3
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发表时间：
1996-05-01
影响因子：
8.4
通讯作者：
Paul, DW
中科院分区：
文献类型：
--
作者：
Chagnard, C;Gilbert, P;Paul, DW
描述了与厚度剪切模式声波传感器一起使用的电子振荡器。振荡器不仅监控传感器的谐振频率，还提供自动增益控制信号来监控传感器消耗的能量。已经进行了电化学石英晶体微天平 (EQCM) 实验，其中传感器的电极之一充当电化学电池中的工作电极。 Tl+ 在传感器表面上的电化学沉积会导致由质量负载引起的频移，同时观察到传感器的能量损失可以忽略不计。 K3Fe(CN)(6)/K4Fe(CN)(6)对的循环伏安法结果不改变传感器上的质量，表明传感器的能量损失可以通过自动增益控制电压直接监测，并且与传感器附近溶液的微粘度有关。向振荡器电路添加自动增益控制可提供通常仅由阻抗分析仪给出的能量损耗信息。该电路适用于遥感或成本是重要因素的情况。
An electronic oscillator for use with thickness-shear-mode acoustic wave sensors is described. The oscillator monitors not only the resonance frequency of the sensor, but also provides an automatic gain control signal that monitors the energy dissipated by the sensor. Electrochemical quartz-crystal microbalance (EQCM) experiments have been performed in which one of the sensor's electrodes serves as the working electrode in an electrochemical cell. Electrochemical deposition of Tl+ on the sensor's surface results in a frequency shift that is attributed to mass loading, while a negligible amount of energy loss from the sensor is observed. Results from the cyclic voltammetry of the K3Fe(CN)(6)/K4Fe(CN)(6) couple, which does not alter the mass on the sensor, indicate that the energy loss from the sensor can be directly monitored by the automatic gain control voltage and is related to the microviscosity of the solution adjacent to the sensor. The addition of automatic gain control to an oscillator circuit provides energy-loss information that is usually only given by impedance analyzers. The circuit is applicable to situations where remote sensing or cost are important factors.