便攜式近紅外光譜儀檢測紅松籽中的水分含量1)

仇遜超 曹軍

(東北林業(yè)大學(xué)，哈爾濱，150040)

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便攜式近紅外光譜儀檢測紅松籽中的水分含量1)

仇遜超 曹軍

(東北林業(yè)大學(xué)，哈爾濱，150040)

為了建立紅松籽水分無損、快速檢測，采用便攜式近紅外光譜儀在波長范圍900～1 700 nm對紅松籽的光譜信息進(jìn)行采集和分析，建立紅松籽水分的近紅外預(yù)測模型。利用多種預(yù)處理方法優(yōu)化模型，同時采用反向間隔偏最小二乘法、無信息變量消除法實現(xiàn)特征波段的選取。結(jié)果表明，帶殼紅松籽光譜經(jīng)矢量歸一化預(yù)處理后構(gòu)建的模型最優(yōu)，松仁光譜經(jīng)一階導(dǎo)數(shù)預(yù)處理后構(gòu)建的模型最優(yōu)；波段篩選能夠優(yōu)化模型質(zhì)量，其中反向間隔偏最小二乘法的篩選結(jié)果最優(yōu)，其帶殼紅松籽和松仁水分模型校正集相關(guān)系數(shù)分別為0.864 1和0.907 8，驗證集均方根誤差分別為1.041 7和0.833 8。結(jié)果表明，經(jīng)過優(yōu)化后，模型的效果較好，能夠?qū)崿F(xiàn)紅松籽水分無損檢測，為帶殼堅果的在線檢測提供技術(shù)參考。

便攜式光譜儀；紅松籽；水分；預(yù)處理方法；波段篩選

Journal of Northeast Forestry University，2016,44(12)：15-20，30.

For building a nondestructive and fast method to test the moisture in Korean pine seeds, we used a portable near infrared (NIR) spectrometer for the acquisition and analysis of the spectral information of the moisture in red pine nuts under the range of 900-1 700 nm, and established the NIR evaluation model of the moisture in Korean pine seeds. We used backward interval partial least squares (BiPLS) and elimination of uninformative variables (UVE) to select characteristic bands. For the Korean pine seeds with peel, the model established after vector normalization preprocessing was the optimal performance, and for the peeled pine nuts, the model established after first derivative preprocessing was the optimal performance. The models could be optimized by the bands selection and BiPLS was the best optimization. The correlation coefficient of calibration (RC) subset of the moisture models of peeled Korean pine seeds and with peel were 0.864 1 and 0.907 8, respectively. The root-mean-square error of validation (RMSEP) subset were 1.041 7 and 0.833 8, respectively. Therefore, the effect of the model was good and the nondestructive test of the moisture in Korean pine seeds could be realized for online test of the nuts with peel.

紅松籽含有100多種對人體有益的成分，是黑龍江省的特色產(chǎn)物，目前已銷往多個國家,是農(nóng)民增收的特色經(jīng)濟(jì)作物之一。紅松籽的含水率直接影響其經(jīng)濟(jì)價值，含水量低，松仁不夠飽滿，質(zhì)量較輕，影響其口感的同時，還導(dǎo)致紅松籽價格的下降；含水量高，在貯藏過程中有利于致病菌微生物的活動，使其發(fā)生腐爛，導(dǎo)致紅松籽品質(zhì)下降[1]。因此含水率是評定紅松籽品質(zhì)的重要參數(shù)之一。由于采摘后的紅松籽隨貯藏時間和貯藏溫度、潮濕度的變化而表現(xiàn)出不同程度的水分散失，因此無法根據(jù)固定值來確定紅松籽的含水率；……