Rapid and nondestructive detection of watercore and sugar content in Asian pear by near infrared spe

来源 :JournalofInnovativeOpticalHealthSciences | 被引量 : 0次 | 上传用户:kaka43210
下载到本地 , 更方便阅读
声明 : 本文档内容版权归属内容提供方 , 如果您对本文有版权争议 , 可与客服联系进行内容授权或下架
论文部分内容阅读
Watercore and sugar content are internal qualities which are impossible for exterior determination. Therefore the aims of this study were to develop models for nondestructive detection of watercore and predicting sugar content in pear using Near Infrared Spectroscopy (NIR) technique. A total of 93 samples of Asian pear variety “SH-078" were used. For sugar content, spectrum of each fruit was measured in the short wavelength region (700–1100 nm) in the reflection mode and the first derivative of spectra were then correlated with the sugar content in juice determined by digital refractometer. Prediction equation was performed by multiple linear regression. The result showed Standard Error of Prediction (SEPT = 0.58°Bx, and Bias = 0.11. The result from t-test showed that sugar content predicted by NIR was not significantly different from the value analyzed by refractometer at 95% confidence. For watercore disorder, NIR measurement was performed over the short wavelength range (700–850 nm) in the transmission mode. The first derivative spectra were correlated with internal qualities. Then principle component analysis (PCA) and partial least squares discriminant analysis (PLSDA) were used to perform discrimination models. The accuracy of the PCA model was greater than the PLSDA one. The scores from PC1 were separated into two boundaries, one predicted rejected pears with 100% classification accuracy, and the other was accepted pears with 92% accuracy. The high accuracy of sugar content determining and watercore detecting by NIR reveal the high efficiency of NIR technique for detecting other internal qualities of fruit in the future.
其他文献
为了寻求一种在同一波长上具有低损耗和低色散的光波导,设计者们已经制作出折射率分布从“W”形到三角形的光纤。在本月新奥尔良召开的光纤通信(OFC)会议上,康宁玻璃公司的V. A. Bhagavatala及其同事还将介绍另一种设计一环截式纤芯。
期刊
分析了半导体硅光敏元件的瞬态光电效应,籍助电容充放电法测量脉冲激光能量。研制了相应的微能量自动监测器,可探测0.1微焦耳激光能量。
期刊
本文研究了任意初态的多光子Jaynes-Cummings模型的一般演化规律.应用到具体问题,讨论了一个二能级原子与相干光场相互作用的双光子Jaynes-Cummings模型的量子统计性质.
We propose an automatic three-dimensional (3D) pupil tracking backlight system for holographic 3D display system with large image size and full-parallax accommodation effect. The proposed tracking module is applied to a holographic 3D display system with
给出了X射线同轴全息中像差的数值模拟.分别研究了其三级波差和光线像差,用一个较为简便的方法计算出光线像差,给出了类似于光线追迹中的点列图,并由此相应地估计出像差对分辨率的限制.所有的计算都是基于一个典型的X射线激光全息实验中的参数进行的.根据分析还讨论了减小像差的条件.
洛斯·阿拉莫斯国家实验室的研究人员正在完善一项旨在减少钢的生产成本并提高质量的光谱学技术。使用所谓激光感应击穿光谱学(LIBS)方法,钢水分析时间不到一分钟,而用常规分折技术则需5到10分钟。考虑到把300吨钢水保持在融熔状态的金属容器所耗的能量,节省几分钟时间就可节省大量费用。
期刊
对各种气体的强激光脉冲增长着的兴趣对电子束设备不断提出要求,对于从短寿命气体提取有效能量,如在紫外和高压化学激光器中,就要求电流高速上升,在上升速率为1013安/秒数量级时,费用急剧上升而增益却减小。
期刊
利用半导体激光器线性调频外差干涉原理和频域多路复用原理,研究了光纤位移传感器多路复用技术,制作了两路复用光纤位移传感器,研究和解决了多路复用时信号串话问题.实验证明,各路之间串话引起的误差小于±0.02μm,每路测量误差小于±0.05μm.
Absorption induced by activated magnesium (Mg) in a p-type layer contributes considerable optical internal loss in GaN-based laser diodes (LDs). An LD structure with a distributed polarization doping (DPD) p-cladding layer (CL) without inten
期刊