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Diagnosis of Nitrogen Status in Rice Leaves with Canopy Spectral Reflectance 被引量:8
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作者 XUELi-hong CAOWei-xing 《Agricultural Sciences in China》 CAS CSCD 2003年第3期250-257,共8页
The investigation was made on the relationship of seasonal time-course canopy spectral reflectance and ratio index to total leaf nitrogen accumulation (leaf nitrogen content per unit ground area) in rice under differe... The investigation was made on the relationship of seasonal time-course canopy spectral reflectance and ratio index to total leaf nitrogen accumulation (leaf nitrogen content per unit ground area) in rice under different nitrogen treatments. The results showed there was a close correlation between the canopy spectral reflectance and total leaf nitrogen accumulation. Ratio of near infrared to green band (R810/R560) was linearly related with total leaf nitrogen accumulation. independent of nitrogen levels and development stages. Different datasets were used to test the linear regression equation, with average estimation accuracy of 91. 22%, RMSE of 1.09 and average relative error of 0. 026. Thus, the ratio index R810/R560 of canopy spectral reflectance should be useful for non-destructive monitoring and diagnosis of nitrogen status in rice plants. 展开更多
关键词 RICE Canopy reflectance spectrum Ratio index (R810/R560) LEAF Nitrogen accumulation Nitrogen diagnosis
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Characterizing and Estimating Fungal Disease Severity of Rice Brown Spot with Hyperspectral Reflectance Data 被引量:3
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作者 LIU Zhan-yu HUANG Jing-feng TAO Rong-xiang 《Rice science》 SCIE 2008年第3期232-242,共11页
Large-scale farming of agriculture crops requires real-time detection of disease for field pest management. Hyperspectral remote sensing data generally have high spectral resolution, which could be very useful for det... Large-scale farming of agriculture crops requires real-time detection of disease for field pest management. Hyperspectral remote sensing data generally have high spectral resolution, which could be very useful for detecting disease stress in green vegetation at the leaf and canopy levels. In this study, hyperspectral reflectances of rice in the laboratory and field were measured to characterize the spectral regions and wavebands, which were the most sensitive to rice brown spot infected by Bipolaris oryzae (Helminthosporium oryzae Breda. de Hann). Leaf reflectance increased at the ranges of 450 to 500 nm and 630 to 680 nm with the increasing percentage of infected leaf surface, and decreased at the ranges of 520 to 580 nm, 760 to 790 nm, 1550 to 1750 nm, and 2080 to 2350 nm with the increasing percentage of infected leaf surface respectively. The sensitivity analysis and derivative technique were used to select the sensitive wavebands for the detection of rice brown spot infected by B. oryzae. Ratios of rice leaf reflectance were evaluated as indicators of brown spot. R669/R746 (the reflectance at 669 nm divided by the reflectance at 746 nm, the following ratios may be deduced by analogy), R702/R718, R692/R530, R692/R732, R535/R746, R521/R718, and R569/R718 increased significantly as the incidence of rice brown spot increased regardless of whether it's at the leaf or canopy level. R702/R718, R692/R530, R692/R732 were the best three ratios for estimating the disease severity of rice brown spot at the leaf and canopy levels. This result not only confirms the capability of hyperspectral remote sensing data in characterizing crop disease for precision pest management in the real world, but also testifies that the ratios of crop reflectance is a useful method to estimate crop disease severity. 展开更多
关键词 derivative spectrum hyperspectral reflectance ratio of spectral reflectance rice brown spot disease severity Bipolaris oryzae Helminthosporium oryzae) sensitivity analysis remote sensing
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Evaluation of TiAl and 40Cr diffusion bonding quality using ultrasonic reflection spectrum 被引量:2
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作者 栾亦琳 刚铁 《China Welding》 EI CAS 2007年第2期72-76,共5页
Combined with ultrasonic pulse-echo technique, reflection spectrum analysis was introduced to evaluate TiAl and 40Cr diffusion bonding quality. Frequency dependence of reflection coefficient was used to distinguish pe... Combined with ultrasonic pulse-echo technique, reflection spectrum analysis was introduced to evaluate TiAl and 40Cr diffusion bonding quality. Frequency dependence of reflection coefficient was used to distinguish perfect bonding from imperfect bonding. It is found that the reflection coefficient from perfect bonding interface does not vary with frequency. When the size of imperfections is much smaller than the wavelength of ultrasound, the reflection coeffwient depends on frequency. When the size of imperfections is the same order of or even larger than the wavelength of ultrasound, the reflection coeffwient does not exhibit frequency dependence. However the amplitude of imperfect interface is higher than the amplitude of perfect bonding interface. A combination of reflection spectrum analysis and ultrasonic pulse-echo technique provides more accurate information about the bonding quality of dissimilar materials. 展开更多
关键词 ultrasonic testing reflection spectrum diffusion bonding dissimilar materials
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A Preliminary Stndy on Identification of Clay Minerals in Soils with Reference to Reflectance Spectra 被引量:2
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作者 XUBIN-BIN LIDE-CHENG 《Pedosphere》 SCIE CAS CSCD 1995年第2期135-142,共8页
The characteristics of the reflectance spectra of clay minerals and their influences on the reflectancespectra of soils are dealt with in the paper. The results showed that dominant clay minerals in soils couldbe dist... The characteristics of the reflectance spectra of clay minerals and their influences on the reflectancespectra of soils are dealt with in the paper. The results showed that dominant clay minerals in soils couldbe distinguished in light of the spectral-form parameters of the reflectance spectra of soils, thus making itpossible to develop a quick method to determine clay minerals by means of reflectance spectra of soils in thelab. and providing a theoretic basis for retnote sensing of clay minerals in soils with a high resolution imagingspectrometer. 展开更多
关键词 clay mineral reflectance spectrum SOIL
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Canopy Spectral Reflectance Characteristics of Rice with Different Cultural Practices and Their Fuzzy Cluster Analysis 被引量:1
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作者 XUELi-hong CAOWei-xing +1 位作者 LUOWei-hong YANGLin-zhang 《Rice science》 SCIE 2005年第1期57-62,共6页
The influence of major cultural practices including different nitrogen application rates, population densities, transplanting leaf ages of seedling, and water regimes on rice canopy spectral reflectance was investigat... The influence of major cultural practices including different nitrogen application rates, population densities, transplanting leaf ages of seedling, and water regimes on rice canopy spectral reflectance was investigated. Results showed that increased nitrogen rates, water regimes and population densities and decreased seedling ages could enhance reflectance at NIR (near infrared) bands and reduce reflectance at visible bands. Using reflectance of green, red and NIR band and ratio index of 810-560 nm could distinguish the different type of rice by fuzzy cluster analysis, 展开更多
关键词 RICE cultural practices canopy reflectance spectrum fuzzy cluster analysis
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Application of Short-wave Near-infrared Reflectance Spectroscopy in Controlling Extract of Fructus Cnidii Using Supercritical Carbon Dioxide 被引量:1
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作者 MI Hong GUO Ye +4 位作者 LI Wen-liang Qu Nan DOU Ying REN Yu-qiu REN Yu-lin 《Chemical Research in Chinese Universities》 SCIE CAS CSCD 2007年第1期116-119,共4页
Fructus cnidii (Chinese name shechuangzi) is the fruit produced by Cnidium monnieri (L.) Cusson (Umbelliferae). It is a perennial herb that is used to treat skin-related diseases and gynecopathyell. Recent pharm... Fructus cnidii (Chinese name shechuangzi) is the fruit produced by Cnidium monnieri (L.) Cusson (Umbelliferae). It is a perennial herb that is used to treat skin-related diseases and gynecopathyell. Recent pharmacological studies have revealed crude extracts or components isolated from fructus cnidii possess antiallergic, antipruritic, antidermatophytic, antibacterial, antifungal, and antiosteoporotic activities. Osthole and imperatorin are the major compounds present in shechuangzi. They are often used as standards for the evaluation of the quality of shechuangzi products. 展开更多
关键词 Fructus cnidii Supercfitical carbon dioxide Short-wave near-infrared diffuse reflectance spectrum Artificial neural network Degree of approximation
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Quantification of the chemical composition of lunar soil in terms of its reflectance spectra by PCA and SVM 被引量:6
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作者 ZHANG Xiaoyu LI Chunlai LU Chang 《Chinese Journal Of Geochemistry》 EI CAS 2009年第2期204-211,共8页
In the second phase of the Chang'E Program an unmanned lunar rover will be launched onto the Moon. When ground scientists get a full understanding of the chemical composition of lunar soil around the rover, they c... In the second phase of the Chang'E Program an unmanned lunar rover will be launched onto the Moon. When ground scientists get a full understanding of the chemical composition of lunar soil around the rover, they can make more detailed survey plans for the rover and various payloads onboard so as to satisfy their scientific objectives. There is an obvious relationship between the reflectance of lunar soil and its chemical characteristics. Both principal component analysis (PCA) and support vector machine (SVM) models were applied to establishing the relationship between the reflectance spectra and chemical compositions of lunar highland and mare soil samples sent back by Apollo missions 11, 12, 14, 15, 16 and 17 and measured by Lunar Soil Characterization Consortium (LSCC). PCA was used to reduce and select the features of the reflectance spectra of lunar soil samples. Then, these features were put into SVM to estimate the abundances of various chemical components in lunar soil. We also compared the results of our measurement with those obtained by the SVM model [partial least squares (PLS)] and the principal component regression (PCR) model reported in literature. Our studies showed that with the exception of TiO2, the results of prediction of the abundances of chemical compounds in lunar soil by our model are much more reliable than those reported in literature. The reflectance spectra of lunar soil are closely related to the materials from which it was derived. 展开更多
关键词 主成分分析 月球土壤 反射光谱 支持向量机 化学成分 SVM模型 土壤样品 偏最小二乘
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Wave Reflection Coefficient Spectrum
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作者 俞聿修 邵利民 柳淑学 《海洋工程:英文版》 2003年第3期383-396,共14页
The wave reflection coefficient frequency spectrum and directional spectrum for concrete face slope breakwaters and rubble mound breakwaters are investigated through physical model tests in the present study. The refl... The wave reflection coefficient frequency spectrum and directional spectrum for concrete face slope breakwaters and rubble mound breakwaters are investigated through physical model tests in the present study. The reflection coefficients of oblique irregular waves are analyzed by the Modified Two-Point Method (MTPM) proposed by the authors. The results show that the wave reflection coefficient decreases with increasing wave frequency and incident angle or decreasing structure slope. The reflection coefficient frequency spectrum and its variation with Iribarren number are given in this paper. The paper also suggests an empirical 3-dimensional reflection coefficient spectrum, i.e. reflection coefficient directional spectrum, which can be used to illustrate quantitatively the variation of reflection coefficient with the incident angle and the Iribarren number for oblique irregular waves. 展开更多
关键词 wave reflection frequency spectrum reflection coefficient directional spectrum slope breakwater
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Cultivar,Nitrogen and Irrigation Influence on Grain Quality and Its Forecasting Methods by In situ Reflected Spectrum of Winter Wheat
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作者 HUANGWen-jiang WANGJi-hua +4 位作者 LIULiang-yun WANGZhi-jie TANChang-wei SONGXiao-yu WANGJing-di 《Agricultural Sciences in China》 CAS CSCD 2004年第11期831-841,共11页
Field experiments were conducted to examine the influence factors of cultivar, nitrogen application and irrigation on grain protein content, gluten content and grain hardness in three winter wheat cultivars under fo... Field experiments were conducted to examine the influence factors of cultivar, nitrogen application and irrigation on grain protein content, gluten content and grain hardness in three winter wheat cultivars under four levels of nitrogen and irrigation treatments. Firstly, the influence of cultivars and environment factors on grain quality were studied, the effective factors were cultivars, irrigation, fertilization, etc. Secondly, total nitrogen content around winter wheat anthesis stage was proved to be significantly correlative with grain protein content, and spectral vegetation index significantly correlated to total nitrogen content around anthesis stage were the potential indicators for grain protein content. Accumulation of total nitrogen content and its transfer to grain is the physical link to produce the final grain protein, and total nitrogen content at anthesis stage was proved to be an indicator of final grain protein content. The selected normalized photochemical reflectance index (NPRI) was proved to be able to predict grain protein content on the close correlation between the ratio of total carotenoid to chlorophyll a and total nitrogen content. The method contributes towards developing optimal procedures for predicting wheat grain quality through analysis of their canopy reflected spectrum at anthesis stage. Regression equations were established to forecast grain protein and dry gluten content by total nitrogen content at anthesis stage, so it is feasible for forecasting grain quality by establishing correlation equations between biochemical constitutes and canopy reflected spectrum. 展开更多
关键词 Winter wheat Canopy reflected spectrum Normalized photochemical reflectance index (NPRI) Grain quality indicators Forecasting
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Canopy Spectral Reflectance Characteristics of Rice with Different Cultural Practices and Their Fuzzy Cluster Analysis
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作者 XUE Li-hong CAO Wei-xing +1 位作者 Luo Wei-hong YANG Lin-zhang 《Rice science》 SCIE 2005年第4期254-254,共1页
The influence of major cultural practices including different nitrogen application rates, population densities, transplanting leaf ages of seedling, and water regimes on rice canopy spectral reflectance was investigat... The influence of major cultural practices including different nitrogen application rates, population densities, transplanting leaf ages of seedling, and water regimes on rice canopy spectral reflectance was investigated. Results showed that increased nitrogen rates, water regimes and population densities and decreased seedling ages could enhance reflectance at NIR (near infrared) bands and reduce reflectance at visible bands. Using reflectance of green, red and NIR band and ratio index of 810-560 nm could distinguish the different type of rice by fuzzy cluster analysis, 展开更多
关键词 RICE cultural practices canopy reflectance spectrum fuzzy cluster analysis
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Impact of the Opto-Geometric Parameters on the Band Diagram and Transmission and Reflection Spectrum of the Bragg Structure
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作者 Iman Ouahab Leila Dekkiche Rafah Naoum 《Optics and Photonics Journal》 2013年第2期184-189,共6页
Knowledge of the band gap and transmission and reflection spectrum of a photonic crystal is essential elements for their design. A graphical interface that quickly determines the banding pattern and spectrum based on ... Knowledge of the band gap and transmission and reflection spectrum of a photonic crystal is essential elements for their design. A graphical interface that quickly determines the banding pattern and spectrum based on the Plane Wave Method (PWM) and coupled modes method (CMM) respectively is created. It is used to explore the behavior of a Bragg structure with the ability to easily vary the important parameters such as refractive indices, number and thickness of layers. 展开更多
关键词 BRAGG STRUCTURE PWM CMM GRAPHIC User Interface PHOTONIC Band Gap spectrum of Transmission and reflection
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Environmental Pollution Bioindication Based on Ficus benjamina L. Leaf Reflectance in the City of Abidjan, Côte d’Ivoire
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作者 Zamblé Fidèle Tra Bi Yao Sadaiou Sabas Barima +2 位作者 Djédoux Maxime Angaman Ali Reza Khavanin Zadeh Karidia Traoré 《Open Journal of Air Pollution》 2016年第2期55-63,共9页
The air in African cities is increasingly polluted mainly due to human activities. A bioindication technical of urban air quality based on active remote sensing might be an alternative to existing physico-chemical met... The air in African cities is increasingly polluted mainly due to human activities. A bioindication technical of urban air quality based on active remote sensing might be an alternative to existing physico-chemical methods. Reflectance measurements in the visible spectrum have been carried out at the adaxial and abaxial sides of Ficus benjamina L. leaves in the city of Abidjan, C&#244te d’Ivoire, with a precision digital camera. Leaves were collected in industrial zones and in parks. The impact of air pollution on leaf physiological as well as structural characteristics in these two contrasts urban environments was determined by Dorsiventral Leaf Reflectance Correlation (DRLC) and dorsiventral leaf reflectance asymmetry quantitatively defined with Normalized Dorsiventral Asymmetry Index (NDAI). Species leaf susceptibility to air pollution from season to season was determined by NDAI seasonal variation. Leaf reflectance measurements allowed the estimation of environmental stress level among industrial areas and parks. NDAI and DLRC were significantly higher in industrial zones compared to parks. NDAI values were found significantly higher for major rainy season compared to major dry season, indicating probably that F. benjamina leaf structure changes were increased from one season to another. Thereby, assessment of urban air quality can be done using leaves reflectance in the visible spectrum. 展开更多
关键词 BIOINDICATION Air Pollution reflectance Visible spectrum Côte d’Ivoire
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IRS辅助的感知增强认知无线电网络资源分配方案 被引量:1
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作者 李飞 吴少聪 +3 位作者 李汀 季薇 梁彦 宋云超 《信号处理》 CSCD 北大核心 2024年第2期326-335,共10页
在过去的几十年里,大部分可用频谱已被用于高速通信服务。这导致了无线通信系统中的频谱资源稀缺问题。另一方面,大量可用频谱的利用率并不高。为提升通信系统的频谱利用率,学界提出了基于共享的认知无线电技术。认知无线电允许次用户... 在过去的几十年里,大部分可用频谱已被用于高速通信服务。这导致了无线通信系统中的频谱资源稀缺问题。另一方面,大量可用频谱的利用率并不高。为提升通信系统的频谱利用率,学界提出了基于共享的认知无线电技术。认知无线电允许次用户与主用户共享频谱资源,对于提升无线通信网络的频谱效率十分重要,然而目前基于认知无线电的通信网络存在着低信噪比情况下感知性能低下、严苛干扰条件下性能提升受限等缺点。最近,智能反射面(Intelligent Reflecting Surface,IRS)被广泛应用在无线通信的各个领域,可以智能调控无线传输环境以满足频谱和能效的高要求。为了进一步提升认知无线电感知性能与频谱效率,提出了一种新颖的IRS辅助的感知增强频谱共享认知无线电网络。针对此网络,建立了次用户和速率最大化优化问题,联合优化次基站波束赋形向量、智能反射面相移矩阵、感知时间。因存在变量耦合,所构建的优化问题是非凸的,提出一种基于块坐标下降(Block Coordinate Descent,BCD)的迭代算法以交替优化波束形成和智能反射面相位以及感知时间。以逐次凸逼近(Successive Convex Approximation,SCA)求解非凸目标和约束函数,并利用半正定松弛(Semidefinite Relaxation,SDR)解决秩一条件约束,采用一维搜索来寻找最佳感知时间。通过仿真结果证明提出的方法能够快速收敛且对认知无线电网络的感知性能以及频谱效率有较大提升作用。 展开更多
关键词 频谱感知 频谱共享 认知无线电 智能反射面
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基于反射光谱的薄膜光学常数和厚度测试
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作者 吕永林 郑万祥 +7 位作者 李汝劼 张友良 唐莹娟 张伟涛 陈奕君 王贵全 李彦生 王乔方 《红外技术》 CSCD 北大核心 2024年第8期965-973,共9页
薄膜的光学常数(折射率、消光系数)和厚度决定了镀膜零件的光学性能,因此根据实际条件掌握薄膜的光学常数和厚度是膜系结构设计和性能优化的重要环节。本文采用傅里叶红外光谱仪测试薄膜样品的反射光谱曲线,通过单纯形优化算法拟合反射... 薄膜的光学常数(折射率、消光系数)和厚度决定了镀膜零件的光学性能,因此根据实际条件掌握薄膜的光学常数和厚度是膜系结构设计和性能优化的重要环节。本文采用傅里叶红外光谱仪测试薄膜样品的反射光谱曲线,通过单纯形优化算法拟合反射光谱曲线,借助不同色散模型,构建目标优化函数,获得薄膜光学常数和厚度,拟合结果与采用椭偏仪测试的结果具有较好的一致性。将拟合得到的薄膜光学参数及厚度代入反射率理论计算模型,通过理论计算模型得到的反射率曲线和实验测试曲线吻合良好,折射率测试结果与计算结果的最大相对误差小于1.8%,厚度测试结果的相对误差不大于0.4%,考虑消光系数的反射光谱拟合曲线与测试曲线相对误差的最大值小于2%。该方法只需测量薄膜的反射光谱曲线,通过计算就能得到薄膜的光学常数及厚度。该方法测试计算简单、精度高、适用范围广,对光学薄膜结构设计、优化和加工具有一定的实际应用价值。 展开更多
关键词 光学薄膜 反射光谱 折射率 薄膜厚度
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盘锦地区不同品种水稻品质及其冠层高光谱反射率特征分析
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作者 王岩 高美琦 +4 位作者 卞景阳 李荣平 赵先丽 温日红 张东奎 《气象与环境学报》 2024年第2期77-85,共9页
对2022年盘锦地区8种水稻进行品质特征分析,并探讨不同品种水稻籽粒加工品质、外观品质、蒸煮品质、营养品质与水稻成熟期冠层原始光谱、一阶导数光谱及连续统去除光谱的相关关系。结果表明:盐粳939的加工品质较好,锦稻106(9系)的外观... 对2022年盘锦地区8种水稻进行品质特征分析,并探讨不同品种水稻籽粒加工品质、外观品质、蒸煮品质、营养品质与水稻成熟期冠层原始光谱、一阶导数光谱及连续统去除光谱的相关关系。结果表明:盐粳939的加工品质较好,锦稻106(9系)的外观品质较好,锦稻香103的蒸煮品质较好,盘粳968(3系)的营养品质较好。原始光谱反射率与糙米率指标的相关关系较好,在731~1131 nm和1150~1360 nm两个波段内,相关系数高达0.767;糙米率与一阶导数光谱的相关关系最好,在1459 nm处达到极显著相关,相关系数为0.867;垩白度和垩白粒率均在1804 nm处与连续统去除光谱的相关关系较好,并达到极显著负相关,相关系数分别为-0.979和-0.983;长宽比与原始光谱的相关关系较好,相关系数在659 nm处达到最大值,为0.849;蒸煮品质所包含的食味值、直链淀粉含量和营养品质所包含的蛋白质含量均与连续统去除光谱有较好的相关关系。 展开更多
关键词 水稻籽粒品质 冠层光谱反射率 一阶导数光谱 连续统去除光谱
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海洋油膜偏振反射特性仿真与测试
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作者 杨迪 李英超 +4 位作者 韩晓磊 史浩东 刘昕悦 孙洪宇 明星 《光子学报》 EI CAS CSCD 北大核心 2024年第4期49-61,共13页
为了海洋溢油的检测与识别,在偏振特性建模中综合考虑天空的偏振辐射、油膜表面的动态反射、接收探测器的姿态和性能,进行全数字仿真,开展外场动态水面的实测,进行油膜偏振半实物仿真,最后对海洋溢油进行了偏振测试与分析。试验结果表明... 为了海洋溢油的检测与识别,在偏振特性建模中综合考虑天空的偏振辐射、油膜表面的动态反射、接收探测器的姿态和性能,进行全数字仿真,开展外场动态水面的实测,进行油膜偏振半实物仿真,最后对海洋溢油进行了偏振测试与分析。试验结果表明:在区分油品方面,汽油和水的强度差值为29.33%,线偏振度差值为0.97%,二者结合可较好的分辨溢油。 展开更多
关键词 海洋溢油 偏振特性 视景仿真 海浪谱 全局与局部坐标转换 偏振双向反射
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天然红宝石结构的原位漫反射中红外光谱研究 被引量:2
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作者 于宏伟 柴嘉欣 +3 位作者 吉一帆 宗雪晴 张泽旺 吴雨靓 《玻璃搪瓷与眼镜》 CAS 2024年第4期10-14,共5页
利用原位漫反射中红外光谱研究天然红宝石的结构,发现红宝石结构的红外吸收模式主要包括:α-Al_(2)O_(3)分子中O^(2-)对静止Al^(3+)位移对应的红外吸收模式(ν_(α-Al_(2)O_(3)-O-Al))、Cr_(2)O_(3)分子中O^(2−)对静止Cr^(3+)位移对应... 利用原位漫反射中红外光谱研究天然红宝石的结构,发现红宝石结构的红外吸收模式主要包括:α-Al_(2)O_(3)分子中O^(2-)对静止Al^(3+)位移对应的红外吸收模式(ν_(α-Al_(2)O_(3)-O-Al))、Cr_(2)O_(3)分子中O^(2−)对静止Cr^(3+)位移对应的红外吸收模式(ν_(Cr_(2)O_(3)-O-Cr))、Fe_(2)O_(3)分子中O_(2)−对静止Fe3+位移对应的红外吸收模式(ν_(Fe_(2)O_(3)-O-Fe))、α-Al_(2)O_(3)分子中Al^(3+)之间位移对应的红外吸收模式(ν_(α-Al_(2)O_(3)-Al-Al))及锌尖晶石特征红外吸收模式(νZnAl_(2)O4);红宝石的主要结构包括:α-Al_(2)O_(3)、Cr_(2)O_(3)、Fe_(2)O_(3)及少量共生锌尖晶石。采用原位漫反射中红外光谱,研究小颗粒红宝石类矿物结构具有重要的应用价值。 展开更多
关键词 红宝石 原位漫反射 红外光谱 α-Al_(2)O_(3) Cr_(2)O_(3) Fe_(2)O_(3) 锌尖晶石
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基于反射系数谱的配电电缆局部缺陷识别定位
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作者 赵洪山 郭潇镁 +1 位作者 马利波 王艳 《华北电力大学学报(自然科学版)》 CAS 北大核心 2024年第4期9-17,共9页
传统配电电缆在局部缺陷识别与精准定位上灵敏度较差,位置范围识别受到限制,为解决现有技术在配电电缆缺陷诊断上存在的不足,提出一种基于反射系数谱的配电电缆局部缺陷识别定位方法。首先依据电缆分布参数模型,获得配电电缆完好状态与... 传统配电电缆在局部缺陷识别与精准定位上灵敏度较差,位置范围识别受到限制,为解决现有技术在配电电缆缺陷诊断上存在的不足,提出一种基于反射系数谱的配电电缆局部缺陷识别定位方法。首先依据电缆分布参数模型,获得配电电缆完好状态与存在局部缺陷段的反射系数谱,然后利用广义正交积分法,将反射系数谱的虚部从频域转换到空间域,建立积分诊断图,得到具有直观性的定位图谱,根据积分诊断图实现配电电缆局部缺陷的识别与精准定位,方法适用于同时存在多处电缆缺陷的情况。最后,在实验室50 m长的配电电缆上制作老化与破损两种缺陷,用于验证所提方法的有效性。仿真和实验结果表明,该方法对不同缺陷情况均具有较高的识别精度,定位误差小于0.15 m。 展开更多
关键词 反射系数谱 分布参数 局部缺陷 广义正交积分法 配电电缆
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基于超声反射法的环氧树脂复合材料内部缺陷检测与频谱分析研究
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作者 吕立翔 杨卓然 +1 位作者 刘剑 朱炫培 《绝缘材料》 CAS 北大核心 2024年第9期131-139,共9页
纤维增强树脂基复合材料被广泛地应用在电力设备中,其涉及多层介质,结构复杂,内部易产生缺陷,在长期电场作用下会引发局部放电甚至绝缘击穿。对绝缘内部缺陷进行早期检测,可以有效减少事故的发生。本文基于超声反射法搭建了复合材料超... 纤维增强树脂基复合材料被广泛地应用在电力设备中,其涉及多层介质,结构复杂,内部易产生缺陷,在长期电场作用下会引发局部放电甚至绝缘击穿。对绝缘内部缺陷进行早期检测,可以有效减少事故的发生。本文基于超声反射法搭建了复合材料超声检测系统,基于真空树脂传递模塑法人工制备了含裂纹、分层和金属杂质缺陷的玻璃纤维增强环氧树脂复合材料平板试样,然后分别对含缺陷的平板试样进行超声检测与频谱分析。结果表明:不同种类缺陷试样的超声反射波形存在明显差异。通过对超声回波进行频谱变换,得出归一化频谱特性曲线,根据曲线计算特征值可以实现对不同形态缺陷的识别。其中裂纹缺陷试样的特征值最小,分层缺陷试样的特征值最大。 展开更多
关键词 环氧树脂复合材料 超声反射法 回波分析 频谱变换 缺陷识别
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基于反射系数与核函数构建的新型电缆缺陷诊断方法 被引量:1
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作者 饶显杰 徐忠林 +2 位作者 刘翔宇 关惠方 周凯 《电工技术学报》 EI CSCD 北大核心 2024年第7期2184-2192,2213,共10页
为解决现有的电缆局部缺陷检测方法中缺陷定位效果差、缺陷类型判断困难等问题,提出一种基于反射系数谱(RCS)的新型电缆缺陷诊断方法。首先,利用电缆线路的分布参数模型,建立了含局部缺陷电缆线路的RCS数学模型,根据RCS数学模型,确定合... 为解决现有的电缆局部缺陷检测方法中缺陷定位效果差、缺陷类型判断困难等问题,提出一种基于反射系数谱(RCS)的新型电缆缺陷诊断方法。首先,利用电缆线路的分布参数模型,建立了含局部缺陷电缆线路的RCS数学模型,根据RCS数学模型,确定合理的核函数,设计出基于RCS的新型缺陷诊断函数,该缺陷诊断函数的极值峰可用于定位电缆线路中的缺陷,并确定缺陷的类型、严重程度等特征;然后,对不同类型与严重程度的电缆线路缺陷进行建模仿真诊断,测试该方法的可行性与准确性;最后,在同轴电缆与10 kV电力电缆上设计了局部缺陷,并用该方法对真实电缆缺陷进行诊断分析。仿真与实测结果表明,该方法能精准地定位电缆线路中的缺陷,并且可以准确地判断出缺陷的类型与严重程度,说明了该方法的实用性,且具有较高的实际工程价值。 展开更多
关键词 电缆线路 局部缺陷 反射系数谱 缺陷定位 缺陷分析
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