基于51单片机的无线式手持电子鼻系统的开发与应用研究

发布时间：2018-06-02 03:29

本文选题：51单片机 + 无线　；参考：《华中科技大学》2012年硕士论文

【摘要】：电子鼻已广泛地应用于生活中的许多领域。手持式电子鼻的发展更是拓展了电子鼻的应用范围。目前的手持式电子鼻大多是以单片机为核心的嵌入式系统，且自身存在一个缺陷，即便携性与分析能力的矛盾。鉴于此本文实现了两款基于51单片机的无线式手持电子鼻系统——NSSRL-H1电子鼻与NSSRL-H2电子鼻。该电子鼻系统由信息获取与数据分析两个分离模块组成，因而兼具比较好的便携性与比较强的分析功能。该电子鼻系统具有低成本、无线化的特点，并有望适用于生产流程控制，，环境监测等场合。 NSSRL-H1电子鼻的成本在RMB10000以内，尺寸为200×130×55mm~3，重量为934g，工作能耗约6W，能够连续工作3.2h。它采用7个商用TGS气体传感器(8个气敏元件)组成的MOS气体传感器阵列，能够同时采集8通道的气体传感器信号，并在每秒内对每个通道采集10个样本点。在NSSRL-H1电子鼻的基础上，经过结构、电路、软件上的优化后实现的NSSRL-H2的电子鼻的尺寸为114×60×45mm~3，重量约为450g，工作能耗减小至3.6W以内，连续工作时间为4h；通过丝网印刷工艺制作了尺寸为6×5.2×0.38mm~3的8元件MOS气体传感器阵列。NSSRL-H2电子鼻不仅比NSSRL-H1电子鼻具有更小的体积和功耗，以及更优化的传感器阵列，而且增加了人机交互的界面与功能。对以上电子鼻的性能从硬件方面进行了评价。实验表明表明该电子鼻系统适用于500~200M电阻范围内的传感器阵列，并且具有较好的稳定性与可靠性。通过一个实际应用测试对电子鼻的性能进行了进一步地验证。选用7种不同的中草药作为电子鼻系统的识别对象。采用主成分分析法(PCA)对实验数据进行了初步分析，表明不同种类中草药的数据样本有着比较明显的界限。采用判别函数法(DFA)对中草药进行了分类，结果显示电子鼻对样本的识别率为94.3%。实验结果表明电子鼻系统的性能良好，具备较好的应用前景。
[Abstract]:Electronic nose has been widely used in many fields of life. The development of hand-held electronic nose has expanded the application scope of electronic nose. At present, most hand-held electronic nose is embedded system with single chip microcomputer as the core, and there is a defect in itself, that is, the contradiction between portability and analytical ability. In view of this, two wireless handheld electronic nose systems based on 51 single chip microcomputer, NSSRL-H1 electronic nose and NSSRL-H2 electronic nose, are implemented in this paper. The electronic nose system is composed of two separate modules: information acquisition and data analysis, so it has good portability and strong analysis function. The electronic nose system has the characteristics of low cost and wireless, and it is expected to be suitable for production process control and environmental monitoring. The cost of NSSRL-H1 electronic nose is within RMB10000, the size is 200 脳 130 脳 55 mm ~ (-3), the weight is 934 g, the working energy consumption is about 6 W, and it can work continuously for 3.2 h. It is composed of 7 commercial TGS gas sensors (8 gas sensors). It can simultaneously collect 8 channels of gas sensor signals and collect 10 sample points per second for each channel. On the basis of NSSRL-H1 electronic nose, the size of the electronic nose of NSSRL-H2 is 114 脳 60 脳 45 mm ~ (-3), the weight is about 450 g, and the working energy consumption is less than 3.6 W after the optimization of the structure, circuit and software, the size of the electronic nose is 114 脳 60 脳 45 mm ~ (-1). An 8-element MOS gas sensor array .NSSRL-H2 electronic nose with a size of 6 脳 5.2 脳 0.38mm~3 has been fabricated by a screen printing process for 4 h. It not only has a smaller volume and power consumption than the NSSRL-H1 electronic nose, but also a more optimized sensor array. In addition, the interface and function of man-machine interaction are added. The performance of the above electronic nose is evaluated in terms of hardware. The experimental results show that the electronic nose system is suitable for the sensor array in the resistance range of 500 ~ 200m and has good stability and reliability. The performance of electronic nose is further verified by a practical application test. Seven kinds of Chinese herbal medicines were selected as the recognition objects of electronic nose system. Principal component Analysis (PCA) was used to analyze the experimental data, which showed that the data samples of different kinds of Chinese herbal medicines had obvious limits. The discriminant function method (DFA) was used to classify Chinese herbal medicines. The results showed that the recognition rate of electronic nose to the sample was 94.3b. The experimental results show that the electronic nose system has good performance and good application prospect.
【学位授予单位】：华中科技大学
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：TP274.2;TP368.12

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