【摘要】：電子舌是由傳感器陣列,配以模式識別方式及多元統(tǒng)計方法的定性分析液體的電子檢測儀器。可以用來檢測不同液體食品的味道,并將其不同的味道信息“可視化”。因此電子舌是目前食品檢測領(lǐng)域中研究的新熱點。 本研究的主要目的是為了探索設(shè)計較為廉價和穩(wěn)定的電子舌系統(tǒng)軟硬件,同時通過一系列相關(guān)實驗和數(shù)據(jù)分析,實現(xiàn)對該系統(tǒng)的可行性驗證。該課題對于食品領(lǐng)域的快速無損檢驗的研究與發(fā)展,有著十分重要的意義。 本課題自主開發(fā)了一套電子舌系統(tǒng),主要由①離子選擇電極傳感器陣列,②信號調(diào)理模塊,③數(shù)據(jù)采集模塊,④數(shù)據(jù)分析模塊,共四部分組成。并開發(fā)了相應(yīng)的軟件,可以對系統(tǒng)進(jìn)行控制,并對采集的數(shù)據(jù)進(jìn)行統(tǒng)計分析及模式識別。主要的研究內(nèi)容主要有以下幾方面： (1)介紹了常用的電子舌傳感器的原理,以及一般的電子舌結(jié)構(gòu)。 (2)設(shè)計了針對離子選擇電極的多通道高阻抗小信號放大電路,把電子舌傳感器的信號進(jìn)行濾波和放大,并以C51MCU為基礎(chǔ)設(shè)計了一塊模數(shù)信號轉(zhuǎn)換板卡,可以采集傳感器信號至PC機(jī)。 (3)利用C語言與VC++平臺,編寫了下位機(jī)和上位機(jī)程序,實現(xiàn)數(shù)據(jù)傳輸,人機(jī)交互,以及儀器控制功能。 (4)在MATLAB7.11環(huán)境下,以機(jī)器學(xué)習(xí)理論為指導(dǎo),編寫了一整套數(shù)據(jù)處理程序,包括PCA, LDA,以及BP, PNN, RBF神經(jīng)網(wǎng)絡(luò)及其參數(shù)優(yōu)化工具,基于Lib-SVM工具箱的模式識別軟件,基于二維搜索的SVM參數(shù)優(yōu)化工具和基于GAOT遺傳算法工具箱的SVM參數(shù)優(yōu)化工具,基于LS-SVM工具箱的模式識別軟件。基于C語言編寫了電子舌數(shù)據(jù)BP神經(jīng)網(wǎng)絡(luò)處理程序。最后整合為原創(chuàng)的ET GUI TEST電子舌數(shù)據(jù)處理軟件。 應(yīng)用該電子舌系統(tǒng)對4種不同品牌的礦泉水和5種不同的蘋果汁,對數(shù)據(jù)進(jìn)行了分析和模式識別,結(jié)果證明,該電子舌系統(tǒng)對礦泉水和蘋果汁的種類可以有效區(qū)分。 由對礦泉水和果汁的檢測試驗,證明該電子舌原型是有效和可行的,本文在總結(jié)與展望中對未來電子舌硬件設(shè)計的發(fā)展做出了展望和更先進(jìn)的設(shè)計。
[Abstract]:The electronic tongue is an electronic detection instrument for qualitative analysis of liquid by a sensor array, a pattern recognition mode and a multivariate statistical method. Can be used to detect the taste of different liquid foods and to "visualization" different taste information. Therefore, the electronic tongue is a new hot spot in the field of food detection. The main purpose of this study is to explore the software and hardware of the electronic tongue system with low cost and stability, and to realize the feasibility of the system by a series of related experiments and data analysis. The subject is of great importance to the research and development of the rapid and non-destructive inspection in the food field. This topic has developed a set of electronic tongue system, which mainly consists of four-part ion-selective electrode sensor array, two-phase signal conditioning module, one-time data acquisition module and one-time data analysis module. The software is developed, and the system can be controlled, and the collected data can be analyzed and used. The main research contents are as follows: Aspects: (1) The principle of the commonly used electronic tongue sensor and the general principle are introduced. The electronic tongue structure is designed. (2) The multi-channel high-impedance small-signal amplifying circuit for the ion-selective electrode is designed, the signal of the electronic tongue sensor is filtered and amplified, an analog-to-digital signal conversion board is designed based on the C51MCU, and the sensor can be collected and sensed. and (3) using the C language and the VC ++ platform, the program of the lower computer and the upper computer is written, the data transmission and the human-machine interaction are realized, and the control function of the instrument. (4) In the environment of MATLAB7.11, a complete set of data processing programs, including PCA, LDA, and BP, PNN, RBF neural network and its parameter optimization tools, are written based on the theory of machine learning, based on the Lib-SV The pattern recognition software of the M-kit, the SVM parameter optimization tool based on the two-dimensional search and the SVM parameter optimization tool based on the GAOT genetic algorithm toolbox, based on the LS-SV The pattern recognition software of the M-kit. The number of electronic tongues is written based on C language. BP neural network processing program. Finally, it is the original ET GUI. The electronic tongue system is used to analyze and pattern the data of four different brands of mineral water and five different kinds of apple juice. The results show that the electronic tongue system is a kind of mineral water. Based on the test of mineral water and fruit juice, it is proved that the prototype of the electronic tongue is effective and feasible. In this paper, the hardware design of the electronic tongue in the future is summarized and prospected.
【學(xué)位授予單位】：浙江大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2012
【分類號】：TP368.1;TP181;TP212.9

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