搜索结果: 1-15 共查到“工学 near-infrared”相关记录34条 . 查询时间(0.109 秒)
Low cost infrared and near infrared sensors for UAVs
UAVs Mapping Visualization Multisensor Aerial Infrared Temperature Imagery Experimental Forest fires
2014/12/4
Thermal remote sensing has a wide range of applications, though the extent of its use is inhibited by cost. Robotic and computer components are now widely available to consumers on a scale that makes ...
Graphene surface plasmons at the near-infrared optical regime
Graphene surface plasmons near-infrared optical regime
2015/8/6
Graphene has been identified as an emerging horizon for a nanoscale photonic platform because the Fermi level of intrinsic graphene can be engineered to support surface plasmons (SPs). The current sol...
Near-infrared surface plasmon polariton dispersion control with hyperbolic metamaterials
Surface plasmons Metamaterials
2015/8/7
We demonstrate experimentally signatures and dispersion control of surface plasmon polaritons from 1 to 1.8 μm using periodic multilayer metallo-dielectric hyperbolic metamaterials. The fabricated str...
Method for Improving the Lateral Resolution of Near-Infrared (NIR) Single Optods: Application to Subcutaneous Vein Detection and Localization
Reflectance Measurements Photon Migration Optical Diagnosis Fiber Probe Design
2013/1/30
NIR backscattering measurements using single source-detector optical probe (optods) can detect absorption areas within deep tissue layer. However, such optods, are characterized by large separation di...
Determining Weight and Moisture Properties of Sound and Fusarium-Damaged Single Wheat Kernels by Near-Infrared Spectroscopy
Determining Weight Moisture Properties Sound and Fusarium-Damaged Single Wheat Kernels Near-Infrared Spectroscopy
2014/5/23
Single kernel moisture content (MC) is important in the measurement of other quality traits in single kernels because many traits are expressed on a dry weight basis. MC also affects viability, storag...
醋糟有机基质含水率的可见/近红外光谱检测(Detection of Moisture Content in Vinegar Residue Substrate Using Visible-near-infrared Spectroscopy)
醋糟 有机基质 含水率
2010/12/29
以醋糟有机基质为研究对象,采用便携式可见/近红外光谱仪采集了不同含水率基质样品(69个)的漫反射光谱,通过选择不同的光谱预处理方法并确定其主成分数,建立了基于偏最小二乘法(PLS)的醋糟基质含水率定量分析模型。结果表明,以滑动平均滤波(MAF)和一阶微分(FD)相结合作为原始光谱的预处理方法所建立的模型(主成分数为5)对基质含水率的检测效果较好,其校正模型和预测模型决定系数分别为0.9930和0....
基于EMD的土壤有机质含量近红外光谱检测(Near-infrared Spectrum Detection of Soil Organic Matter Content Based on Empirical Mode Decomposition)
土壤有机质 检测 经验模态分解 近红外光谱
2010/12/29
以检测土壤有机质含量为例,探讨经验模态分解在土壤近红外光谱检测中的应用,提出了应用的原理和步骤。用处理后的光谱计算了土壤中的有机质含量,并与九点平滑和小波变换方法的处理结果进行了对比分析。结果表明:与传统的九点平滑处理结果相比,SNR从3 dB左右提高到10 dB左右,原始信号与消噪信号之间的标准差由2.972降到0.901;预测集的决定系数r2由0.9410提高到0.9803, 预测均方根...
微量有机磷农药残留近红外光谱快速检测方法(Determination of Organophosphorus Pesticide Residue by Using Near-infrared Spectroscopy)
有机磷农药 近红外光谱 偏最小二乘回归法
2010/12/28
以滤纸作为农药载体,在波数4000~10000cm-1范围内获取其近红外光谱曲线。分别采取偏最小二乘回归法和最佳波段差值回归法建立农药质量比的预测模型。偏最小二乘回归法在经过多元散射校正和变量标准化预处理后得到的预测结果较好,预测相关系数为0.954,通过最佳波段差值回归法得到的预测相关系数为0.904。两种建模方法都得到了较好的预测结果。
雪莲花产地鉴别的近红外光谱分析方法(Discrimination of Snow Lotus from Different Geographical Origins by Near Infrared Spectroscopy)
雪莲花 产地鉴别 近红外光谱 K-最近邻域
2010/12/28
以青海、西藏、云南和新疆4个不同产地的雪莲花为研究对象,利用K-最近邻域(KNN)模式识别方法建立雪莲花产地鉴别模型,模型参数K和主成分因子数(PCs)通过交互验证的方法优化;同时比较了标准正态变量变换(SNV)、多元散射校正(MSC)、一阶导数和二阶导数4 种预处理方法对模型结果的影响。试验结果显示,通过SNV光谱预处理后,在K为3和PCs为5时,所得到的模型最佳,模型交互验证识别率和预测识...
猪肉肌内脂肪含量的可见/近红外光谱在线检测(On-line Prediction of Intramuscular Fat Content in Pork Muscle with Visible/Near-infrared Spectroscopy)
猪肉 肌内脂肪含量 在线检测 小波消噪
2010/12/28
研究基于可见/近红外光谱分析技术的新鲜猪肉肌内脂肪含量在线检测。实验样本为208份背最长肌,实验时样品以0.25m/s的速度运动,采集可见/近红外漫反射光谱,进行小波消噪处理后,结合不同的光谱预处理方法建立肌内脂肪含量的偏最小二乘回归模型。研究发现采用db6小波在6层分解后以极大极小原理选择阈值进行消噪效果较好;消噪的光谱直接建立的PLSR模型预测性能较差,经过多元散射校正、变量标准化及微分等预...
霉变板栗的近红外光谱和神经网络方法判别(Discrimination of Moldy Chinese Chestnut Based on Artificial Neural Network and Near Infrared Spectra)
板栗 近红外光谱 BP神经网络 预处理
2009/11/3
利用近红外光谱检测了带壳板栗的品质。在波数为12000~4000cm-1范围内采用近红外漫反射法采集了合格板栗和霉变板栗的光谱,用6种光谱预处理方法分析数据,比较了板栗近红外光谱在不同预处理方法下所建模型的识别率。试验结果表明经矢量归一化预处理所建模型识别效果最好,对预测集中的合格板栗、表面霉变板栗、内部霉变板栗的预测正确率分别为94.74%、94.44%、92.31%。
土壤中总氮与总磷含量的近红外光谱实时检测方法(Real-time Analysis of Soil Total N and P with Near Infrared Reflectance Spectroscopy)
近红外光谱 土壤总氮 土壤总磷
2009/11/3
以浙江省潮化盐土为研究对象,用近红外光谱分析技术探测土壤氮(N)和磷(P)的含量。从试验田采集6组土样,每组取20个样品,共计120个样品。利用均值法、卷积滤波确定最终光谱数据,然后采用偏最小二乘回归法(PLS)及最小二乘支持向量机(LS-SVM)分别建立了土壤总氮和总磷的近红外光谱模型,其中采用PLS所建模型的相关系数分别为0.9454(N)、0.9327(P),预测标准误差分别为0.0321(...
苹果内部品质近红外光谱检测的异常样本分析(Outlier Sample Analysis on Near Infrared Spectroscopy Determination for Apple Interior Quality)
苹果 无损检测 异常样本 近红外光谱
2010/2/26
应用声光可调谐滤光器近红外光谱仪检测苹果内部品质(可溶性固形物含量、总糖、总酸和硬度)时,综合利用Cook距离、马氏距离、杠杆值和学生化残差,判断疑似异常样本点,然后用二审剔除判别法确定异常样本点。最终可溶性固形物含量、总糖、总酸模型都剔除了11个异常样本,硬度模型剔除了6个异常样本。其偏最小二乘回归模型的相关系数分别从0.868、0.791、0.443、0.693提高到0.904、0.849、0...
Near-Infrared Resonance Energy Transfer Glucose Biosensors in Hybrid Microcapsule Carriers
Near-Infrared Resonance Energy Transfer Glucose Biosensors Hybrid Microcapsule Carriers
2009/9/7
Fluorescence-based sensing systems offer potential for noninvasive monitoring with implantable devices, but require carrier technologies that provide suitable immobilization, accessibility, and biocom...
基于近红外傅里叶特征提取方法的土壤含水率检测(Near-infrared Spectral Detection of Soil Moisture Based on Feature Extraction of FFT)
土壤 含水率 近红外光谱
2009/8/11
以湖北地区的3种土壤为研究对象,利用偏最小二乘法建立了处理后样品的土壤含水率分析模型,模型预测值与标准值的决定系数为0.995,交叉验证预测均方差为0.801%,模型预测决定系数为0.992,预测均方差为0.912%,利用该模型预测黄土高原地区黄绵土含水率误差均大于4%。利用近红外光谱傅里叶变换特征提取方法对湖北地区黄棕壤、稻田土和潮土建立土壤含水率PLS预测模型,模型决定系数为0.988,交叉验...