【摘要】：食用植物油是人體重要的營養(yǎng)和能量來源，是重要的食品工業(yè)基礎原料，“民以食為天，食以安為先”，由于我國食用植物油消費量的巨大，，劣質食用植物油不僅危害了消費者的健康利益，還關系到社會的安定。 在食用植物油劣化變質過程中，會有氧化、水解、聚合等一系列的化學反應，極性小分子含量會發(fā)生變化，即表現(xiàn)為介電常數(shù)的變化。所以，通過檢測食用植物油介電常數(shù)的變化，可以判定食用植物油品質的好壞。本文首先闡述了食用植物油的品質檢測原理，依據該原理研究并設計了基于電容傳感器和電容檢測的食用植物油品質檢測系統(tǒng)，用3類食用植物油進行了初步實驗，分別給出了它們在特定條件下的品質關系函數(shù)。 食用植物油品質檢測系統(tǒng)設計主要有以下三個方面組成，主要采用數(shù)據前端傳感器（電容和溫度），分析并設計了電容信號的放大調理電路以及微控制器外圍接口技術。該系統(tǒng)以NXP公司的Cortex-M0微處理器為控制核心，采用平板電容傳感器探頭測量食用植物油的介電常數(shù)；測量時將傳感器探頭插入樣品油中，激勵源正弦波信號由微控制器PWM調制產生，傳感器輸出電壓信號經傳感器模擬前端(AFE)系統(tǒng)LMP90100送入微控制器；由于在測量食用植物油電容時，溫度會對結果有一定的干擾，系統(tǒng)設計了基于數(shù)字溫度傳感器DS18B20的溫度測量電路；微控制器與上位機之間采用RS232通訊，再由計算機進行數(shù)據處理、溫度的影響分析、顯示和打印等。 食用植物油品質檢測系統(tǒng)有微處理器程序設計與上位機界面設計兩個方面組成，微處理器程序主要有PWM的正弦調制算法和外圍器件驅動，外圍器件驅動有溫度傳感器18B20的單總線通訊，與模擬前端器件LMP90100的SPI通訊以及與上位機的串口通訊。上位機界面采用NI(美國國家儀器)的LabVIEW軟件編寫，實現(xiàn)數(shù)據記錄與分析；線性回歸的方法，找出待測樣品的品質關系函數(shù)。 課題完成了食用植物油品質檢測系統(tǒng)的開發(fā)，并以不同品質的食用植物油為對象，進行了初步實驗。實驗結果表明，具有較好的數(shù)據重現(xiàn)性，分別建立了葵花籽油、大豆油和調和油與地溝油含量相關的數(shù)學模型。
[Abstract]:Edible vegetable oil is an important source of nutrition and energy for the human body and an important raw material for the food industry. "the people take food as the day, and the food comes first." because of the huge consumption of edible vegetable oil in China, Inferior edible vegetable oil not only endangers the health benefits of consumers, but also relates to social stability. A series of chemical reactions, such as oxidation, hydrolysis and polymerization, will occur during the deterioration of edible vegetable oil, and the content of polar small molecules will change, that is, the change of dielectric constant. Therefore, the quality of edible vegetable oil can be judged by detecting the change of dielectric constant of edible vegetable oil. In this paper, the quality detection principle of edible vegetable oil is first expounded. According to this principle, the quality detection system of edible vegetable oil based on capacitance sensor and capacitance detection is studied and designed, and the preliminary experiment is carried out with three kinds of edible vegetable oil. Their quality relation functions under certain conditions are given respectively. The design of edible vegetable oil quality detection system is mainly composed of the following three aspects: the data front-end sensor (capacitance and temperature) is used to analyze and design the amplifying and conditioning circuit of the capacitor signal and the peripheral interface technology of the microcontroller. In this system, the dielectric constant of edible vegetable oil is measured by using the panel capacitance sensor probe with the Cortex-M0 microprocessor of NXP company as the control core. When the sensor probe is inserted into the sample oil, the exciting source sinusoidal wave signal is modulated by the microcontroller PWM, and the output voltage signal of the sensor is fed into the microcontroller via the sensor analog front-end (AFE) system LMP90100. Because the temperature will interfere with the result when measuring the capacitance of edible vegetable oil, a temperature measuring circuit based on digital temperature sensor DS18B20 is designed. RS232 communication is used between the microcontroller and the host computer, and then the data is processed by the computer, the influence of temperature is analyzed, and the display and print are carried out. The edible vegetable oil quality detection system consists of two aspects: microprocessor program design and upper computer interface design. The microprocessor program mainly includes PWM sinusoidal modulation algorithm and peripheral device driver. The peripheral device drives the single bus communication with the temperature sensor 18B20, the SPI communication with the analog front-end device LMP90100 and the serial port communication with the host computer. The upper computer interface is compiled with the LabVIEW software of NI to record and analyze the data, and the linear regression method is used to find out the quality relation function of the sample to be tested. The quality detection system of edible vegetable oil was developed, and a preliminary experiment was carried out on different quality edible vegetable oil. The experimental results show that there is a good reproducibility of the data. The mathematical models of sunflower oil, soybean oil and blending oil related to the oil content in the gutter are established respectively.
【學位授予單位】：河南工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2012
【分類號】：TP274;TP368.11

【參考文獻】

相關期刊論文 前10條

1 范璐;吳娜娜;霍權恭;王美美;;模式識別法分析5種植物油脂[J];分析化學;2008年08期

2 陳禾,陳維賢,曹振,田翠華;利用可控振蕩法測量配網電容電流[J];高電壓技術;2000年02期

3 坎雜,王麗紅,張曉海,黃勇;介電特性的研究與應用[J];中國農機化;2004年04期

4 邱桂蘋;于曉洋;陳德運;;微小電容測量電路[J];黑龍江電力;2006年05期

5 李書國;李雪梅;陳輝;;我國食用油質量安全現(xiàn)狀、存在問題及對策研究[J];糧食與油脂;2005年12期

6 鄧鵬;杜方嶺;王守經;王文亮;;電導法在食用油質量檢測中的應用研究[J];農產品加工(學刊);2008年07期

7 徐沖;劉遠洋;;電導率法鑒別食用油中潲水油實驗條件的選擇[J];農產品加工(創(chuàng)新版);2010年04期

8 姬雄華,李錄堂;食品安全問題與恩格爾質量系數(shù)[J];農業(yè)現(xiàn)代化研究;2005年06期

9 呂俊峰;郭文川;于修燭;;高溫處理對食用調和油微波介電特性與品質的影響[J];農業(yè)機械學報;2010年10期

10 謝守華;油脂的自動氧化和氧化穩(wěn)定性及檢測方法[J];四川糧油科技;1998年04期

相關博士學位論文 前1條

1 周雅琳;煎炸油的品質評價及其極性化合物的快速檢測技術研究[D];西南大學;2009年

相關碩士學位論文 前6條

1 陳敏;便攜式油品水分檢測儀的開發(fā)[D];中南大學;2004年

2 王桂華;餐飲業(yè)廢油脂回用飲食市場的鑒別和危害性研究[D];暨南大學;2004年

3 劉薇;餐飲店潲水油快速監(jiān)控方法的研究[D];暨南大學;2005年

4 楊欣;花生油質量檢測儀的研究[D];吉林大學;2007年

5 王樂;餐飲業(yè)廢油脂摻偽可食用油的鑒別檢測研究[D];武漢工業(yè)學院;2008年

6 王政;基于介電特性的植物油品質快速檢測技術的研究[D];四川農業(yè)大學;2009年

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