用于水果品质检测的小型成像光谱仪

摘要

利用成像光谱可同时获得水果的成像信息和光谱信息,实现水果外部和内部品质的高精度、无损伤、无污染的大面积瞬态检测.为了获得水果的成像光谱,设计了一种以自主研发的凸面光栅作为核心元件的小型成像光谱仪,它具有成像质量好、体积小、重量轻等优点,光谱分辨率在578 nm波长处达2.1nm,光谱谱线弯曲和色畸变均小于0.6％.对该小型成像光谱仪进行了检测和苹果成像光谱测量实验,结果表明:该成像光谱仪满足设计要求且可以快速的获得苹果的高精度成像光谱,从而进行水果的品质检测.%Imaging spectrometer can acquire spatial and spectral information of the target at the same time, achieve high-precision, non-destructive, non-contamination and large area instantaneous inspection of the fruit In order to get the imaging spectrum of the fruit, compact imaging spectrometer with convex grating produced by self was designed, it has the advantages of good performance, small volume and low weight, its resolution at 578 nm is 2.1 nm, and spectral line bend and chromatic distortion arc both smaller than 0. 6%. Laboratory test of the imaging spectrometer and the experiment of getting the imaging spectrum of apple were done, and the result shows that the imaging spectrometer satisfies the design requirement and can acquire the imaging spectrum of apple rapidly with high precision for inspection of fruit quality.