水果内部品质在线近红外分光检测装置及试验

Detecting Device for on Line Detection of Internal Quality of Fruits Using Near Infrared Spectroscopy and the Related Experiments

阐述了近红外分光法检测水果内部品质的基本原理和检测流程 ,分析比较了在线式反射光测定法、不完全遮光型透过光测定法和完全遮光型透过光测定法的特点 ;以柑橘和苹果为检测对象 ,用完全遮光型透过光水果内部品质测定装置进行在线糖度、酸度及内部褐变等检测试验 ,并与常规分析法测定结果进行回归分析。结果表明 ,在线检测的糖度值与实测值的相关系数在 0 .95以上 ,酸度相关系数大于 0 .85 ,且能检测内部缺陷 。

The basic principles and detecting flow in fruit internal quality detecting process were explained by the near infrared spectroscopy. The three measuring methods, i.e. the on line reflex, the partially shaded light transmission and the fully shaded light transmission, were analyzed and compared. Oranges and apples served as detected objects, the experiments on on line sugar degree, acidity, internal brown change were undertaken by a fully shaded light transmission detecting device. Also, it provided a recession analyses based on the results of conventional analysis. The results showed that the correlation coefficiect between the actual value and detected value on line is over 0.95,and the correlation coefficiect of acidity is over 0.85. The method of fully shaded light transmission can detect internal defect and quaily of fruit on line.