本文選題：51單片機 + 無線��； 參考：《華中科技大學(xué)》2012年碩士論文

【摘要】：電子鼻已廣泛地應(yīng)用于生活中的許多領(lǐng)域。手持式電子鼻的發(fā)展更是拓展了電子鼻的應(yīng)用范圍。目前的手持式電子鼻大多是以單片機為核心的嵌入式系統(tǒng)，且自身存在一個缺陷，即便攜性與分析能力的矛盾。鑒于此本文實現(xiàn)了兩款基于51單片機的無線式手持電子鼻系統(tǒng)——NSSRL-H1電子鼻與NSSRL-H2電子鼻。該電子鼻系統(tǒng)由信息獲取與數(shù)據(jù)分析兩個分離模塊組成，因而兼具比較好的便攜性與比較強的分析功能。該電子鼻系統(tǒng)具有低成本、無線化的特點，并有望適用于生產(chǎn)流程控制，，環(huán)境監(jiān)測等場合。 NSSRL-H1電子鼻的成本在RMB10000以內(nèi)，尺寸為200×130×55mm~3，重量為934g，工作能耗約6W，能夠連續(xù)工作3.2h。它采用7個商用TGS氣體傳感器(8個氣敏元件)組成的MOS氣體傳感器陣列，能夠同時采集8通道的氣體傳感器信號，并在每秒內(nèi)對每個通道采集10個樣本點。在NSSRL-H1電子鼻的基礎(chǔ)上，經(jīng)過結(jié)構(gòu)、電路、軟件上的優(yōu)化后實現(xiàn)的NSSRL-H2的電子鼻的尺寸為114×60×45mm~3，重量約為450g，工作能耗減小至3.6W以內(nèi)，連續(xù)工作時間為4h；通過絲網(wǎng)印刷工藝制作了尺寸為6×5.2×0.38mm~3的8元件MOS氣體傳感器陣列。NSSRL-H2電子鼻不僅比NSSRL-H1電子鼻具有更小的體積和功耗，以及更優(yōu)化的傳感器陣列，而且增加了人機交互的界面與功能。 對以上電子鼻的性能從硬件方面進行了評價。實驗表明表明該電子鼻系統(tǒng)適用于500~200M電阻范圍內(nèi)的傳感器陣列，并且具有較好的穩(wěn)定性與可靠性。通過一個實際應(yīng)用測試對電子鼻的性能進行了進一步地驗證。選用7種不同的中草藥作為電子鼻系統(tǒng)的識別對象。采用主成分分析法(PCA)對實驗數(shù)據(jù)進行了初步分析，表明不同種類中草藥的數(shù)據(jù)樣本有著比較明顯的界限。采用判別函數(shù)法(DFA)對中草藥進行了分類，結(jié)果顯示電子鼻對樣本的識別率為94.3%。實驗結(jié)果表明電子鼻系統(tǒng)的性能良好，具備較好的應(yīng)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.
【學(xué)位授予單位】：華中科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2012
【分類號】：TP274.2;TP368.12

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本文編號：1967174