發(fā)布時(shí)間：2019-01-23 10:35

【摘要】：基于二組分混和食用油的吸收系數(shù)是各自組分吸收系數(shù)按照摻雜比例的線性組合的假設(shè)以及朗伯-比爾吸收機(jī)理,提出并推導(dǎo)了二組分食用混合油的線性混合數(shù)學(xué)模型。該數(shù)學(xué)模型可根據(jù)相同厚度的兩種原料油和其二組分混合油對(duì)相同光源的吸收光強(qiáng)變化計(jì)算出混合油的組分比例。根據(jù)誤差理論,利用全微分公式分析了組分比例計(jì)算值的誤差,表明通過(guò)選擇使兩種原料油的透射光強(qiáng)和吸光度差值的乘積較大的波長(zhǎng)位置,可以優(yōu)選出檢測(cè)波長(zhǎng)。搭建了可見(jiàn)-近紅外光譜檢測(cè)系統(tǒng),利用花生油摻雜玉米油、花生油摻雜大豆油和玉米油摻雜大豆油三種混合油對(duì)模型進(jìn)行了驗(yàn)證。結(jié)果表明,該模型對(duì)摻雜10%以上的混合油的成分比例計(jì)算值和實(shí)際值的相對(duì)誤差在5%以內(nèi),相關(guān)系數(shù)分別達(dá)到0.999 4,0.999 7和0.999 3,標(biāo)準(zhǔn)誤差分別為0.006 9,0.005 1和0.007 6,并證實(shí)本研究的波長(zhǎng)選取方法是合理的。此外,對(duì)3種按同樣比例組合的、未混合的分立油樣本進(jìn)行了檢測(cè),計(jì)算組合比的相對(duì)誤差也可控制在10%以內(nèi),同時(shí)揭示入射光源的平行度和待測(cè)裝置的垂直度對(duì)檢測(cè)精度有一定影響。試驗(yàn)證明,不同于傳統(tǒng)的光譜結(jié)合化學(xué)計(jì)量學(xué)的檢測(cè)方法,本方法可以僅通過(guò)檢測(cè)原料油和混合油在選定波長(zhǎng)上的吸收光強(qiáng)即可準(zhǔn)確計(jì)算得到摻雜比例。
[Abstract]:Based on the assumption that the absorption coefficient of two-component mixed edible oil is a linear combination of their absorption coefficients according to the doping ratio and the Lamber-Beer absorption mechanism, a linear mixed mathematical model of two-component edible oil is proposed and deduced. This mathematical model can calculate the composition ratio of the mixed oil according to the light intensity variation of two kinds of feedstock and its mixed oil of the same thickness to the same light source. According to the error theory, the error of the component proportion calculation value is analyzed by using the total differential formula. It is shown that the detection wavelength can be selected by selecting the wavelength position where the transmission intensity of the two feedstock oils and the product of the absorbance difference are larger. The model was verified by peanut oil doped corn oil, peanut oil doped soybean oil and corn oil doped soybean oil. The results show that the relative error between the calculated value and the actual value is less than 5%, and the correlation coefficient is 0.999 and 0.999 3, respectively. The standard error is 0.006 ~ 0.0051 and 0.007 ~ 6, respectively, and it is proved that the method of wavelength selection in this study is reasonable. In addition, the relative error of the calculation of the combination ratio can also be controlled within 10% of the three unmixed oil samples combined in the same proportion. It is also revealed that the parallelism of the incident light source and the perpendicularity of the device to be tested have a certain influence on the detection accuracy. It is proved by experiments that the doping ratio can be accurately calculated by only detecting the absorption intensity of feedstock and mixed oil at selected wavelengths, which is different from the traditional spectroscopic combined chemometrics method.
【作者單位】： 天津大學(xué)精密儀器與光電子工程學(xué)院;中國(guó)醫(yī)學(xué)科學(xué)院生物醫(yī)學(xué)工程研究所;
【基金】：國(guó)家(863)計(jì)劃項(xiàng)目(2015AA021105)資助
【分類號(hào)】：O657.3;TS227

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