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介绍了一种基于SnO2气体传感器阵列电子鼻系统的设计方案。描述了电子鼻系统的工作原理及系统的硬件组成结构,设计了基于SnO2气体传感器的加热电路及信号调理与采集电路,采用VC++设计了上位机数据采集与模式识别软件。通过实验,验证了BP网络模式识别算法应用于电子鼻系统是可行的。
A design scheme of electronic nose system based on SnO2 gas sensor array is introduced. The working principle of the electronic nose system and the hardware structure of the system are described. The heating circuit and the signal conditioning and collecting circuit based on the SnO2 gas sensor are designed. The software of PC data acquisition and pattern recognition is designed by VC ++. Experiments show that it is feasible to use BP network pattern recognition algorithm in electronic nose system.