共查询到20条相似文献,搜索用时 93 毫秒
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黄瑞娟 《现代测量与实验室管理》2015,(1):9-14
过去十年中,红外光谱在全球食品工业中的应用已呈现出快速的增长趋势。傅立叶变换红外光谱(FTIR)技术得到许多研究者青睐。尤其是化学计量学方法在提取光谱信息和排除背景干扰方面取得良好效果后,人们重新认识红外光谱技术的价值,使红外光谱在食品检测中的应用得到快速发展。本文就红外光谱技术的原理和特征及相关专家学者对其在食品检测方面应用的研究成果进行综述,以期为食品企业的检验分析工作者在引进傅立叶红外光谱仪时提供参考。 相似文献
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科技信息技术的发展在提高燃油加油机加油效率的同时带来了新的问题。为追求更大的利润空间,一些不法分子在消费者进行加油时利用燃油加油机的技术漏洞,通过新的电子技术手段改变加油机实际输出燃油量值,从而达到牟取更大利润的目的。这种违法行为给消费者带来损失的同时给国家正常市场经济秩序带来了恶劣的影响。我国在新颁布的《燃油加油机最新规程》(JJG443-2015)在计量器具中明确提出防作弊功能,旨在从数据产生的源头对作弊行为进行控制。面对日益隐蔽的作案手法,有必要对燃油加油机的防作弊系统做一个整体的检测和研究,探讨燃油加油机的发展方向及对策分析。 相似文献
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材料的红外无损检测技术及其进展 总被引:5,自引:0,他引:5
目的 介绍材料的红外无损检测以及红外无损检测技术这一领域的最新进展。方法 综述了材料的红外无损检测技术的理论基础和影响其测试精度的因素,以及国内外的进展。结果与结论 红外无损检测技术可检测到其它检测技术所无法检测的区域,与其它检测技术有互补的作用,作者综述了这种技术在近年来比较活跃的几个方面。 相似文献
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《中国测试》2020,(1):50-55
该文旨在探索一种基于红外光谱技术的原油含水率快速检测方法,研究采用油田提供的3种MDT取样流体原油样本,每种原油制备5种含水率、5种矿化度,共计75个不同属性的油水乳状液。采集75个配制样本的红外光谱,进行波长筛选并用一阶导数+减去一条直线+SG卷积平滑(17)法对光谱进行预处理,对谱图进行分析,并用偏最小二乘法建立关于原油含水率的定量检测模型。最终建模相关系数R达到94.44%,交互验证均方根误差RMSECV为4.11,相对分析误差RPD为3.04;预测相关系数R为83.54%,预测均方根误差RMSEP为7.44,模型稳健性良好。研究表明红外光谱检测技术对于原油含水率检测具有可行性,为光谱技术应用于原油含水率在线检测奠定了基础,可为测井勘探技术提供一种新的途径。 相似文献
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《中国新技术新产品》2016,(23)
电网小电流接地系统发生单接地故障,支持绝缘子、避雷器、电压互感器等电气元器件绝缘劣化击穿所造成的接地点查找判断十分困难,是影响供电可靠性的重要因素。本文通过一起35kV小电流接地系统单相接地故障的查找案例,介绍了红外检测技术在小电流接地系统查找单相接地故障的成功经验,提出了将红外检测手段作为小电流接地系统单相接地故障查找的重要技术手段的建议。 相似文献
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作为一种新型的检测和诊断技术,红外检测技术以非接触、远距离、速度快、操作简便等优势,在电力运行设备中得到广泛应用。由于红外检测技术不仅能够实现大面积扫描与局部缺陷定点测温,还能够实现在线的监测与诊断,以确保电气线路的安全级可靠运行。因此,通过简要介绍红外检测技术及基本原理,根据电力线路运行中影响红外检测技术的因素,对电力线路中红外检测技术的检测方式进行详细分析,并对其实际的应用做出阐述。 相似文献
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材料的红外无损检测技术及其进展 总被引:5,自引:0,他引:5
目的 介绍材料的红外无损检测以及红外无损检测技术这一领域的最新进展 .方法 综述了材料的红外无损检测技术的理论基础和影响其测试精度的因素 ,以及国内外的进展 .结果与结论 红外无损检测技术可检测到其它检测技术所无法检测的区域 ,与其它检测技术有互补的作用 .作者综述了这种技术在近年来比较活跃的几个方面 相似文献
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现代先进战斗机大量采用各种先进的航空电子系统,传统的检测手段一般采用人工方法直接测试将故障定位到电路板级,操作复杂,所需时间长,不能满足现代化战争的快速要求,而且操作人员的劳动量大,不利于连续作战。所以,应用现代化的检测手段检测和确定故障备受关注。本文总结了现役战斗机测试系统的现状,存在的问题,并阐述了测试设备的发展趋势。 相似文献
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文章介绍了可实用的CAD/CAPP/CAM集成系统。该系统是由机械产品设计人员,工艺人员和数控机床NC编程人员共同努力,在商品CAD/CAM软件Pro/ENGINEER平台上开发的。系统由三个子系统组成:零件信息识别子系统,CAPP子系统和自动CAM子系统。零件信息识别子系统从三维零件中提取零件信息,CAPP子系统分析零件信息,自动生成零件加工工序和工步,从刀具数据库中查询刀具及切削用量,并完成各工序的工步排序。自动CAM子系统根据CAPP的结果,自动生成Pro/ENGINEER的NC工步,经过NC仿真后 相似文献
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Evaluation of Blackbody Cavity Emissivity in the Infrared Using Total Integrated Scatter Measurements 总被引:1,自引:0,他引:1
L. M. Hanssen S. N. Mekhontsev J. Zeng A. V. Prokhorov 《International Journal of Thermophysics》2008,29(1):352-369
Deviations from ideal blackbody (BB) behavior can be characterized by a BB’s effective emissivity. The cavity emissivity is
most often obtained through a model, given a particular set of input parameters associated with the BB cavity geometry and
surface optical properties. It can also be measured directly (radiance) or indirectly (reflectance). A study of BB cavity
emissivity using the reflectance method is presented. Several types and designs of blackbody cavities, including those from
fixed-point and water bath BBs, using our infrared total integrated scatter (ITIS) instrument for emissivity evaluation are
examined. The emissivity is characterized as a function of position on the output aperture, as well as a function of output
angle. The measurements have revealed emissivity values, both significantly greater than, and in confirmation of, modeling
predictions. For instance, the emissivities of three fixed point BB cavity designs were found to vary significantly despite
modeling predictions in the design process of similar behavior. Also, other BB cavities that exhibited poor emissivity performance
were re-painted and re-machined, in one case more than once, before the predicted performance was achieved. 相似文献
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Arshia Arif M. Jawad Khan Kashif Javed Hasan Sajid Saddaf Rubab Noman Naseer Talha Irfan Khan 《计算机、材料和连续体(英文)》2022,70(1):535-559
For BCI systems, it is important to have an accurate and less complex architecture to control a device with enhanced accuracy. In this paper, a novel methodology for more accurate detection of the hemodynamic response has been developed using a multimodal brain-computer interface (BCI). An integrated classifier has been developed for achieving better classification accuracy using two modalities. An integrated EEG-fNIRS-based vector-phase analysis (VPA) has been conducted. An open-source dataset collected at the Technische Universität Berlin, including simultaneous electroencephalography (EEG) and functional near-infrared spectroscopy (fNIRS) signals of 26 healthy participants during n-back tests, has been used for this research. Instrumental and physiological noise removal has been done using preprocessing techniques followed by individually detecting activity in both modalities. With resting state threshold circle, VPA has been used to detect a hemodynamic response in fNIRS signals, whereas phase plots for EEG signals have been constructed using Hilbert Transform to detect the activity in each trial. Multiple threshold circles are drawn in the vector plane, where each circle is drawn after task completion in each trial of EEG signal. Finally, both processes are integrated into one vector-phase plot to get combined detection of hemodynamic response for activity. Results of this study illustrate that the combined EEG-fNIRS VPA yields considerably higher average classification accuracy, that is 91.35%, as compared to other classifiers such as support vector machine (SVM), convolutional neural networks (CNN), deep neural networks (DNN) and VPA (with dual-threshold circles) with classification accuracies 82%, 89%, 87% and 86% respectively. Outcomes of this research demonstrate that improved classification performance can be feasibly achieved using multimodal VPA for EEG-fNIRS hybrid data. 相似文献
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Wenhao Ran Lili Wang Shufang Zhao Depeng Wang Ruiyang Yin Zheng Lou Guozhen Shen 《Advanced materials (Deerfield Beach, Fla.)》2020,32(16):1908419
Infrared (IR) photodetectors are a key optoelectronic device and have thus attracted considerable research attention in recent years. Photosensitivity is an increasingly important device performance parameter for nanoscale photodetectors and image sensors, as it determines the ultimate imaging quality and contrast. However, photosensitivities of state-of-the-art low-dimensional nanostructure-based IR detectors are considerably low, limiting their practical applications. Herein, a biomimetic IR detection amplification (IRDA) system that boosts photosensitivity by several orders of magnitude by introducting nanowire field effect transistors (FETs), resulting in a peak photosensitivity of 7.6 × 104 under an illumination of 1342 nm, is presented. Consequently, high-contrast imaging of IR light is obtained on the flexible IRDA arrays. The image information can be then trained and recognized by an artificial neural network for higher image-recognition efficiency. This work provides a new perspective for developing high-performance IR imaging systems, and is expected to undoubtedly enlighten future work on artificial intelligence and biorobotic systems. 相似文献
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红外弱小目标检测跟踪并行处理系统 总被引:2,自引:0,他引:2
针对红外弱小目标的实时检测与跟踪,本文设计了一套基于4×ADSP TS201S-600处理器的多DSP并行处理系统.该系统拥有LVDS数字视频输入输出接口,利用TS201S的链路口构建了松耦合并行处理系统,支持多DSP间的两两交叉互联和板级互联,定点运算的峰值速度可达19.2 GMAC@16 bit/s,浮点运算的峰值速度可达14.4 GFLOPS.实验结果表明,该并行处理系统具有高实时性、良好的适用性和扩展性等特点,可以实现对大画面,高帧频的红外弱小目标实时检测跟踪. 相似文献
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为解决传统瓦楞纸箱戳穿试验仪所存在的检测精度低、可靠性差、自动化程度低和安全防护不足等弊端,利用现代控制与侦测技术,研制了一种精度高、易操作、使用安全的新型瓦楞纸箱戳穿试验仪。该设备由能量迸发与传递、戳穿能量侦测、导向运动、安全保护和自动控制等模块组成,其控制系统程序采用LabVIEW编写。测试验证结果表明,该设备的检测稳定性能好,精确度达0.7%以下,完全能满足现行检测标准要求。同时,该设备可实现对试验过程的自动化控制,具有自动校对功能,且设计有角锥限位与遥控启动双重安全措施,可保障操作人员的安全。 相似文献
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为解决传统瓦楞纸箱戳穿试验仪所存在的检测精度低、可靠性差、自动化程度低和安全防护不足等弊端,利用现代控制与侦测技术,研制了一种精度高、易操作、使用安全的新型瓦楞纸箱戳穿试验仪。该设备由能量迸发与传递、戳穿能量侦测、导向运动、安全保护和自动控制等模块组成,其控制系统程序采用LabVIEW编写。测试验证结果表明,该设备的检测稳定性能好,精确度达0.6%以下,完全能满足现行检测标准要求。同时,该设备可实现对试验过程的自动化控制,具有自动校对功能,且设计有角锥限位与遥控启动双重安全措施,可保障操作人员的安全。 相似文献