三电极电化学传感器的恒电位仪设计  

Design of Potentiostat for Three-electrode Electrochemical Sensors

作　　者：姚毓升[1] 解永平[1] 文涛[1] 

机构地区：[1]大连理工大学电子系,辽宁大连116024

出　　处：《仪表技术与传感器》2009年第9期23-25,共3页Instrument Technique and Sensor

摘　　要：三电极电化学传感器在化学、生物和环境监测等领域的应用越来越广泛,为了充分发挥其性能,并实现测量仪器的便携性,选用AT89S8252单片机和A/D、D/A转换器等IC芯片,设计了一种用于传感器电流信号检测的便携式恒电位仪。该恒电位仪通过电压负反馈调节系统使电化学传感器的工作电压等于基准电压,并保持恒定。为检测仪器的性能,用一个电路模型等效三电极电化学传感器进行了测试,实验结果表明该恒电位仪具有很好的精度。Three-electrode electrochemical sensor is used in the area of chemical, biology and environment detecting. To take full advantage of the performance of sensor and to achieve the portability of the detecting instrument, AT89S8252 SCM and IC chips such as A/D, D/A converter were selected for the design of a portable potentiostat to detect the signal of the electric current. The potentiostat makes the working voltage of the electrochemical sensor a constant and equal to the reference voltage by the voltage negative feedback adjusts system. To test the performance of the instrument, a testing was carried out using a circuit model which is equivalent to the three-electrode electrochemical sensor. The experimental result shows that the instrument has good accuracy.

关 键 词：电化学传感器 三电极 便携性 恒电位仪 

分 类 号：O652.2[理学—分析化学]