水果含糖量近红外漫反射检测实验及分析研究

The experimental study and analysis on near-infrared diffuse reflection detection of fruit sugar content

实现水果内部品质快速无损检测,不仅是农业生产的需要,也是满足我国消费者日益多元化要求的需要.基于近红外光谱分析技术,该文采用近红外漫反射检测方法,设计了水果含糖量的近红外检测的实验系统.实验以新疆阿克苏苹果、海南香蕉和新疆鲜枣为研究样本对象,研究3种水果整体样本光谱图与切片样本光谱图,分析了光谱图的差异性.并且,实验还进一步研究了香蕉和鲜枣实验样本在一定时间周期内的光谱图情况,分析了7 d时间周期内实验样本光谱变化.结果表明,近红外漫反射检测方法可以有效实现实验水果样本的无损检测,检测结果能够反映实验水果样本的含糖量情况.同时,实验水果样本切片反映出的内部信息,比实验水果整体样本更加丰富.并且,实验验证了跃变型和非跃变型水果随时间变化的光谱变化规律,即:跃变型实验水果样本在1周内光谱变化明显,其光谱吸收度呈现出先升高后降低总体趋势;而非跃变型实验水果样本,在1周内的光谱差异性不大.

Rapid nondestructive testing of fruit internal quality is not only necessary for agricultural production,but also to meet the increasingly diversified requirements of Chinese consumers.Based on near-infrared spectral analysis technology,this paper uses the near-infrared diffuse reflection detection method,and designs the experimental system of fruit sugar content of near-infrared detection experiments.By taking the Xinjiang Aksu apple,the Xinjiang fresh jujube and the Hainan banana as samples,the experiment studies spectra of the three kinds of fruits,including the whole intact sample spectra and the slice sample spectra,and analyzes the difference of the spectra.And the experiment also further studies the sample's spectra of the experimental banana and fresh jujube in a certain time period of spectrogram,analyzes the experiment sample's spectral changes within seven days cycle.The experiment results show that the near-infrared diffuse reflection method can effectively achieve the experimental samples of fruit nondestructive testing,and the test results could reflect the the sugar content situation.At the same time,the experimental fruit slice samples reflects the more rich internal information than the whole intact samples.The experimental climacteric fruit samples spectral changes obviously within a week,its spectral absorbance showed an overall trend of first increasing and then decreasing.However,the spectral difference of experimental climacteric fruit samples was not significant within one week.