摘要
柑橘是我国总种植面积最大的水果,改进其品质筛选方法能够降低劳动成本并有效提升产业经济收益。本文利用蒙特卡罗法对柑橘的近红外光检测进行模拟仿真,根据柑橘三层结构建立了具有不同吸收系数、散射系数、折射率和各向异性因子的三层球形光学模型。同时,综合考虑光子入射轨迹、曲面边界对光子运动轨迹的影响以及收集的反馈信息,搭建了柑橘品质近红外检测的仿真系统,并设计了一种收发一体的多功能光纤探测器。结果表明,所设计的光纤探测器可以实现对果肉层光子的选择性探测,有效提高了柑橘内部品质信息的检测灵敏度。
Objective The citrus industry,one of the most important fruit industries in China,is currently focusing on nondestructive internal quality grading.Near-infrared(NIR)spectroscopy has been widely used to provide accurate analysis of the material components of agricultural products,owing to its advantages of convenience and efficiency.Among different measurement setups,optical fiber probes are frequently used as a key optics accessory for collecting the NIR spectrum.The Monte Carlo(MC)method offers an accurate description of light propagation in the fruit tissue using a multilayer sample model,which provides the theoretical basis for the design of a more effective optical fiber probe in fruitquality inspection.However,in the MC model,the target sample is usually described as a combination of multiple semiinfinite turbid mediums,which simplifies the structural characteristics of the tissue.Moreover,the structure and geometry of optical fiber probes are also ignored in most cases,which may lead to deviations in the simulation results.This study develops a more detailed description of light propagation in citrus tissues by analyzing the photon transmission near the optical fiber probe as well as the surface boundary of the sphere sample and suggests a probe design for reflectance-based detection.Methods Based on the characteristics of citrus fruits,a three-layered optical model in the shape of a sphere is established,which includes flavedo,albedo,and vesicle layers with different absorption coefficients,scatter coefficients,refractive indices,and anisotropy factors.A simulation system of citrus-quality detection is developed,comprehensively considering the injection near the source fiber,the photon track near the surface boundary,and the information collected by the detector fiber.The corresponding changes are implemented in the general MC code for the simulation of transmission characteristics in the citrus tissue,including normalized relative diffuse reflectance,average motion pathlength of photons,and the percentage
作者
刘睿奇
刘真民
商娅娜
陈振宜
陈娜
刘书朋
Liu Ruiqi;Liu Zhenmin;Shang Yana;Chen Zhenyi;Chen Na;Liu Shupeng(Key Laboratory of Specialty Fiber Optics and Optical Access Networks,Joint International Research Laboratory of Specialty Fiber Optics and Advanced Communication,School of Communication and Information Engineering,Shanghai University,Shanghai 200444,China)
出处
《中国激光》
EI
CAS
CSCD
北大核心
2023年第10期105-111,共7页
Chinese Journal of Lasers
基金
国家自然科学基金(62175142,61875118)。
关键词
光纤光学
光纤探头
蒙特卡罗模拟
柑橘无损检测
近红外光谱技术
球形模型
fiber optics
optical fiber probe
Monte Carlo simulation
nondestructive detection of citrus fruit
nearinfrared spectroscopy
sphere model
