水果品质的多光谱检测方法与系统研究  

Study on Multispectral Detection Method and System for Fruit Quality

作　　者：郑一鸣 魏扬 李琨 陈晓西 ZHENG Yiming;WEI Yang;LI Kun;CHEN Xiaoxi(School of Optoelectronic Science and Engineering,University of Electronic Science and Technology of China,Chengdu 611731,China)

机构地区：[1]电子科技大学光电科学与工程学院,成都611731

出　　处：《实验科学与技术》2024年第3期29-32,38,共5页Experiment Science and Technology

基　　金：四川省科技计划应用基础研究项目(2020YJ0327)。

摘　　要：为无损获取检测样品的多光谱图像,研究了一种利用液晶可调谐滤光片(LCTF)获取多光谱图像的方法。多级LCTF以Lyot形式级联可在很宽的光谱波段内电控调谐,通过改变所施加电压的大小,实现对滤光片的动态调制,获得高精度的窄带光谱输出。与传统的使用多光谱仪获取多光谱图像相比,该方法具有控制简单、调制电压小、可快速连续调制等优点。该文采用1/4波片法测量一组波片的电压-相位延迟特性,选取合适的波片组成三级滤光片,实现对宽带光谱的窄带滤光,并基于这种方法构建了多光谱成像系统,用于实现对水果品质的无损多光谱检测。In order to obtain the multispectral image of the non-destructive test sample,a method of obtaining the multispectral image by using the liquid crystal tunable filter(LCTF)is studied.LCTF has the functions of light modulation,deflection and filtering.The cascade of multi-stage Lyot wave plates can be electronically tuned in a wide spectral band.By changing the applied voltage,the dynamic modulation of the filter can be realized to obtain high-precision narrow-band spectral output.Compared with the traditional multi-spectral image obtaine by using the multi-spectral spectrometer,LCTF has the advantages of simple control,low modulation voltage,fast continuous modulation and so on.In this paper,the voltage phase delay characteristics of a group of wave plates are measured by the quarter-wave retarder method,and the appropriate wave plates are selected to form a triple filter to realize the narrow-band filtering of the broadband spectrum.A multispectral imaging system is obtained by this method to realize non-destructive testing for fruit quality.

关 键 词：液晶可调谐滤光片 多光谱成像 相位延迟量测量 水果品质 

分 类 号：O433.1[机械工程—光学工程]