NON-DESTRUCTIVE MEASUREMENT OF SOLUBLE SOLID CONTENT IN PERSIMMON USING VISIBLE_NIR SPECTROSCOPY BASED ON PCA AND BP
In order to achieve fast and non-destructive measurement of soluble solid content (SSC) in persimmon( diospyros kaki thunb), a new method based on Visible_near infrared reflectance (NIR) spectroscopy was put forward. A Field Spec 3 spectroradiometer was used for collecting 22 sample spectra data of the three kinds of persimmon separately. Then principal component analysis (PCA) was used to process the spectral data after pretreatment using the average Smoothing method, and 6 principal components (PCs) were selected based on accumulative reliabilities. These selected PCs would be taken as the inputs of the three-layer back-propagation artificial neural network (BP-ANN). A total of 66 persimmon samples were divided into calibration sets including 51 samples（17 samples of each variety） and validation sets including 15 samples（5 samples of each variety） randomly. The three-layer BP-ANN model was established with 6 nodes that is 6 principal components (PCs) in input layer, 1 node that is soluble solid content (SSC) of persimmon in output layer and 11 nodes in hidden layer. Then this model was used to predict soluble solid content of persimmon for the sample in the validation set. The result showed that a standard error of calibration (SEC) of the calibration model was 0.232, and its prediction relative error below 3％ was achieved, and the decision coefficient (R2) between the predicted value and the measurement value was 0.99, and the forecast standard deviation (SEP) was 0.257. It could be concluded that PCA combined with BP-ANN is an available method for soluble solid content measurement of persimmon based on NIR spectroscopy.
Visible_NIR spectroscopy Persimmon Soluble solid content Principal component analysis BP neural network
Zhang Shujuan Zhang Haihong Wang Fenghua Zhao Conghui Yang Guoqiang
College of Engineering and Technology,Shanxi Agricultural University,Taigu,Shanxi,China 030801
国际会议
北京
英文
1-7
2009-10-14（万方平台首次上网日期，不代表论文的发表时间）