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Integrated On-line Instrumentation System of Magnetic Properties Measurement
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作者 D.G.Park, Y.Y.Song. H.Song and J.H.Hong (Korea Atomic Energy Research Institute, Yusong P.O.Box 105, Taejon, 305-600 Korea) C.G.Kim (Department of Physics, Sun Moon Univ., Asan-si, Chungnam, 336840 Korea) 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2000年第2期248-249,共2页
A portable microcomputer-controlled inspection system has been developed for detection of magnetic properties of soft magnetic materials. It incorporates custom designed software for control of the magnetic field duri... A portable microcomputer-controlled inspection system has been developed for detection of magnetic properties of soft magnetic materials. It incorporates custom designed software for control of the magnetic field during operation such as demagnetization, field sweeping, and for data logging and analysis. Results are recorded using a 12-bit analog to digital converter and are then stored on disk. The magnetic hysteresis loop and Barkhausen noise data can be converted into important magnetic parameters: coecivity, remanence, and hysteresis loss, Barkhausen amplitude, and Barkhausen noise energy. This system incorporated with the magnetostriction, and magnetoacoustic emission, is then related with the nondestructive detection of material degradation. 展开更多
关键词 line integrated on-line Instrumentation System of Magnetic Properties Measurement
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Calibration of Soil Electromagnetic Conductivity in Inverted Salinity Profiles with an Integration Method 被引量:9
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作者 YAO Rong-Jian YANG Jin-Song LIU Guang-Ming 《Pedosphere》 SCIE CAS CSCD 2007年第2期246-256,共11页
Various calibration methods have been propounded to determine profiles of apparent bulk soil electrical conductivity (ECa) and soil electrical conductivity of a saturated soil paste extract (ECe) or a 1:5 soil water e... Various calibration methods have been propounded to determine profiles of apparent bulk soil electrical conductivity (ECa) and soil electrical conductivity of a saturated soil paste extract (ECe) or a 1:5 soil water extract (EC1:5) using an electromagnetic induction instrument (EM38). The modeled coefficients, one of the successful and classical methods hitherto, were chosen to calibrate the EM38 measurements of the inverted salinity profiles of characteristic coastal saline soils at selected sites of Xincao Farm, Jiangsu Province, China. However, this method required three parameters for each depth layer. An integration approach, based on an exponential decay profile model, was proposed and the model was fitted to all the calibration sites. The obtained model can then be used to predict EC1:5 at a certain depth from electromagnetic measurements made using the EM38 device positioned in horizontal and vertical positions at the soil surface. This exponential decay model predicted the EC1:5 well according to the results of a one-way analysis of variance, and the further comparison indicated that the modeled coefficients appeared to be slightly superior to, but not statistically different from, this exponential decay model. Nevertheless, this exponential decay model was more significant and practical because it depended on less empirical parameters and could be used to perform point predictions of EC1:5 continuously with depth. 展开更多
关键词 coastal saline soils electromagnetic conductivity exponential decay model integration calibration method inverted salinity profiles
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Calibration chain design based on integrating sphere transfer radiometer for SI-traceable on-orbit spectral radiometric calibration and its uncertainty analysis 被引量:1
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作者 赵维宁 方伟 +2 位作者 孙立微 崔立红 王玉鹏 《Chinese Physics B》 SCIE EI CAS CSCD 2016年第9期276-283,共8页
In order to satisfy the requirement of SI-traceable on-orbit absolute radiation calibration transfer with high accuracy for satellite remote sensors,a transfer chain consisting of a fiber coupling monochromator(FBM)... In order to satisfy the requirement of SI-traceable on-orbit absolute radiation calibration transfer with high accuracy for satellite remote sensors,a transfer chain consisting of a fiber coupling monochromator(FBM) and an integrating sphere transfer radiometer(ISTR) was designed in this paper.Depending on the Sun,this chain based on detectors provides precise spectral radiometric calibration and measurement to spectrometers in the reflective solar band(RSB) covering 300–2500 nm with a spectral bandwidth of 0.5–6 nm.It shortens the traditional chain based on lamp source and reduces the calibration uncertainty from 5% to 0.5% by using the cryogenic radiometer in space as a radiometric benchmark and trap detectors as secondary standard.This paper also gives a detailed uncertainty budget with reasonable distribution of each impact factor,including the weak spectral signal measurement with uncertainty of 0.28%.According to the peculiar design and comprehensive uncertainty analysis,it illustrates that the spectral radiance measurement uncertainty of the ISTR system can reach to 0.48%.The result satisfies the requirements of SI-traceable on-orbit calibration and has wider significance for expanding the application of the remote sensing data with high-quality. 展开更多
关键词 SI-traceable calibration on-orbit high-accuracy transfer chain integrating sphere transfer radiometer uncertainty analysis
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Resolving double-sided inverse heat conduction problem using calibration integral equation method
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作者 CHEN Hong-chu 《Journal of Central South University》 SCIE EI CAS CSCD 2019年第8期2100-2108,共9页
In this paper, a novel calibration integral equation is derived for resolving double-sided, two-probe inverse heat conduction problem of surface heat flux estimation. In contrast to the conventional inverse heat condu... In this paper, a novel calibration integral equation is derived for resolving double-sided, two-probe inverse heat conduction problem of surface heat flux estimation. In contrast to the conventional inverse heat conduction techniques, this calibration approach does not require explicit input of the probe locations, thermophysical properties of the host material and temperature sensor parameters related to thermal contact resistance, sensor capacitance and conductive lead losses. All those parameters and properties are inherently contained in the calibration framework in terms of Volterra integral equation of the first kind. The Laplace transform technique is applied and the frequency domain manipulations of the heat equation are performed for deriving the calibration integral equation. Due to the ill-posed nature, regularization is required for the inverse heat conduction problem, a future-time method or singular value decomposition (SVD) can be used for stabilizing the ill-posed Volterra integral equation of the first kind. 展开更多
关键词 inverse heat conduction problem surface heat flux estimation calibration integral equation method
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Hierarchy structure characteristics analysis for the China Loess watersheds based on gully node calibration 被引量:4
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作者 Hai-ying ZHAO Yi-peng +1 位作者 XU Yue-xue LIU Hai-ying 《Journal of Mountain Science》 SCIE CSCD 2018年第12期2637-2650,共14页
A land surface region can be decomposed into a series of watershed units with a hierarchical organizational structure. For loess landform, the watershed is a basic spatial–structural unit that can express natural lan... A land surface region can be decomposed into a series of watershed units with a hierarchical organizational structure. For loess landform, the watershed is a basic spatial–structural unit that can express natural landforms, surface morphology characteristics, spatial organization and developmental evolution. In this research we adopted the concept of node calibration in the watershed structure unit, selected six complete watersheds on China Loess Plateau as the research areas to study the quantitative characteristics of the hierarchical structure in terms of watershed geomorphology based on digital elevation model(DEM) data, and then built a watershed hierarchical structure model that relies on gully structure feature points. We calculated the quantitative indices, such as elevation, flow accumulation and hypsometric integral and found there are remarkably closer linear correlation between flow accumulation and elevation with increasing gully order, and the same variation tendency of hypsometric integral also presented. The results showed that the characteristics of spatial structure become more stable, and the intensity of spatial aggregation gradually enhances with increasing gully order. In summary, from the view of gully node calibration, the China Loess watershed structure shows more significantly complex, and the developmental situation variation of the loess landforms also exhibited a fairly stable status with gully order increasing. So, the loess watershed structure and its changes constructed the complex system of the loess landform, and it has the great significance for studying the spatial pattern and evolution law of the watershed geomorphology. 展开更多
关键词 Digital ELEVATION models Flow accumulation GULLY structure feature point Hypsometric integral LOESS LANDFORM NODE calibration
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Electrical Calibration for Calvet Type Microcalorimetry 被引量:1
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作者 Chen Jiawei Bao Zhengyu Mei YupingFaculty of Earth Sciences, China University of Geosciences, Wuhan 430074 《Journal of China University of Geosciences》 SCIE CSCD 2001年第3期232-235,共4页
The device construction and working principle of Calvet type heat conductive microcalorimetry are generally introduced in this paper. Based on previous work, we design a reactor vessel and its electrical calibration e... The device construction and working principle of Calvet type heat conductive microcalorimetry are generally introduced in this paper. Based on previous work, we design a reactor vessel and its electrical calibration equipment according to our special study systems. The heat constant of our improved microalorimetry is gotten by means of electrical calibration on the basis of Tian's equation. The results gotten by integration method are identical with ones gotten by peak method. It shows that our improved device works well enough to develop further studies. 展开更多
关键词 electrical calibration MICROCALORIMETRY integration method peak method heat constant.
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Calibration of a rule-based intelligent network simulation model 被引量:1
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作者 A. A. Memon M. Meng +1 位作者 Y. D. Wong S. H. Lam 《Journal of Modern Transportation》 2016年第1期48-61,共14页
This paper is focused on calibration of an intelligent network simulation model (INS1M) with reallife transportation network to analyse the INSIM's feasibility in simulating commuters' travel choice behaviour unde... This paper is focused on calibration of an intelligent network simulation model (INS1M) with reallife transportation network to analyse the INSIM's feasibility in simulating commuters' travel choice behaviour under the influence of real-time integrated multimodal traveller information (IMTI). A transportation network model for the central and western areas of Singapore was simulated in PARAMICS and integrated with INSIM expert system by means of an application programming interface to form the INSIM. Upon calibration, INSIM was able to realistically present complicated scenarios in which real-time IMTI was provided to commuters and the network performance measures being recorded. 展开更多
关键词 Traffic simulation integrated travellerinformation. calibration Mode choice
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New Calibration Technology for Safety Valves of Utility Boiler 被引量:5
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作者 张传虎 刘琨 《Electricity》 2001年第4期44-49,共6页
Butterfly spring-relief valve, a crucial safety attachment of pressure vessel, is used to prevent pressuresystem from exceeding allowable limit value. Safe, expeditious and accurate calibration of safety valves is con... Butterfly spring-relief valve, a crucial safety attachment of pressure vessel, is used to prevent pressuresystem from exceeding allowable limit value. Safe, expeditious and accurate calibration of safety valves is consequentlyof vital importance to safe and economic operation of generating units. NSH CALIBRATOR could complete, not only theon-line performance and parameter tests of safety valves within two to five seconds with opening pressure of safetyvalves and steam medium pressure automatically recorded, but also could complete the on-line adjustment of safetyvalves verified unqualified. It saves energy consumption, decreases noise pollution and improves accuracy and efficiencyof safety valve calibration.[ 展开更多
关键词 on-line calibrator butterfly spring-relief valve error analysis data processing performancecharacteristics analysis
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On-Line Measurement of the Chemical Oxygen Demand in Wastewater in a Pulp and Paper Mill Using Near Infrared Spectroscopy 被引量:5
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作者 John Dahlbacka Josefina Nystrom +2 位作者 Torgny Mossing Paul Geladi Tom Lillhonga 《Spectral Analysis Review》 2014年第4期19-25,共7页
Although near infrared (NIR) spectroscopy has been evaluated for numerous applications, the number of actual on-line or even on-site industrial applications seems to be very limited. In the present paper, the attempts... Although near infrared (NIR) spectroscopy has been evaluated for numerous applications, the number of actual on-line or even on-site industrial applications seems to be very limited. In the present paper, the attempts to produce online predictions of the chemical oxygen demand (COD) in wastewater from a pulp and paper mill using NIR spectroscopy are described. The task was perceived as very challenging, but with a root mean square error of prediction of 149 mg/l, roughly corresponding to 1/10 of the studied concentration interval, this attempt was deemed as successful. This result was obtained by using partial least squares model regression, interpolated reference values for calibration purposes, and by evenly distributing the calibration data in the concentration space. This work may also represent the first industrial application of online COD measurements in wastewater using NIR spectroscopy. 展开更多
关键词 Chemical Oxygen Demand (COD) Industrial Wastewater Near Infrared Spectroscopy (NIR) Multivariate calibration on-line Measurement
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The Improved Calibration Method and Retrieval Models Using Advanced Ground-based Multi-frequency Microwave Sounder
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作者 Jieying He Shengwei Zhang 《遥感科学(中英文版)》 2013年第3期27-40,共14页
关键词 检索模型 校准方法 探测仪 多频道 微波 人工神经网络 液态水含量 非线性校正
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Collision Vehicle Detection System Based on GPS/INS Integration
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作者 Neda Navidi Rene Jr. Landry 《Journal of Computer and Communications》 2017年第2期48-70,共23页
Continuous vehicle tracking as well as detecting accidents, are significant services that are needed by many industries including insurance and vehicle rental companies. The main goal of this paper is to provide metho... Continuous vehicle tracking as well as detecting accidents, are significant services that are needed by many industries including insurance and vehicle rental companies. The main goal of this paper is to provide methods to detect the position of car accident. The models consider GPS/INS-based navigation algorithm, calibration of navigational sensors, a de-nosing method as long as vehicle accident, expressed by a set of raw measurements which are obtained from various environmental sensors. In addition, the location-based accident detection model is tested in different scenarios. The results illustrate that under harsh environments with no GPS signal, location of accident can be detected. Also results confirm that calibration of sensors has an important role in position correction algorithm. Finally, the results present that the proposed accident detection algorithm can recognize accidents and related its positions. 展开更多
关键词 ACCIDENT Detection GPS INS EKF GPS/INS integration calibration DE-NOISING
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Accelerometer Bias and Star Sensor Installation Error Joint Calibration for the SINS/CNS Integrated Navigation System Using Attitude Maneuver
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作者 Xiaolin Ning Yuqing Yang +1 位作者 Xiaoyu Liang Jie Zhang 《Guidance, Navigation and Control》 2022年第2期18-32,共15页
The integrated strap-down inertial nav igation system/olelestial navigation system(SINS/CNS)i an important autonomous navigation method with efective concealment and high predision.Both accelerometer biss and star ens... The integrated strap-down inertial nav igation system/olelestial navigation system(SINS/CNS)i an important autonomous navigation method with efective concealment and high predision.Both accelerometer biss and star ensor installation error ame important factors that aflect the performanoe of this mavigation system,which needl to be calibratexd and compensatedl.A new acelerometer bias and star sensor installation error joint calibration method for the SINS/CNS integrated navigation system i propoeed.In this newly propoeed method,the installation error of star sensor is augmented to the state vector,and the star vector,nadir angle,horkzontal poeition error and velbcity error ame ueed a8 measurementa to calbrate the two errors mentioned above.Simulations show that both accelerometer bias and star sensor installation enror an be calibratedl efectively. 展开更多
关键词 SINS/CNS integrated navigation accelerometer bias star sensor installation error calibration method
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激光测距仪多自由度集成可调装置的研制
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作者 范彩霞 刘德波 +1 位作者 刘朝中 孙晨磊 《机械设计与制造》 北大核心 2024年第10期262-265,共4页
基于测距仪激光轴竖直向上和向下两个方向的定位装夹及多自由度调节需要,设计了模块化的集成可调装置:(1)零点定位装夹模块,方便测距仪的快速固定和装配;(2)摇臂式角度调节模块,在调节过程中,确保测距仪测量基准面不变;(3)落地式和吊顶... 基于测距仪激光轴竖直向上和向下两个方向的定位装夹及多自由度调节需要,设计了模块化的集成可调装置:(1)零点定位装夹模块,方便测距仪的快速固定和装配;(2)摇臂式角度调节模块,在调节过程中,确保测距仪测量基准面不变;(3)落地式和吊顶式二维移动及调平模块,适应不同工作现场的检定需要;在此基础上完成实物样机的制造装配和测试,结果表明,该装置各模块组装便捷、调节精度高,结构设计独特紧凑、重心低稳定性好,可以较好地满足大量程液位计现场校准的快速定位和多自由度调节。 展开更多
关键词 大量程液位计 现场校准 激光测距仪 多自由度 集成可调装置
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基于GPS-惯性数据的激光大气数据系统标定方法 被引量:1
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作者 李彬 雷宏杰 +3 位作者 岳亚洲 周原 田哲铭 乔金良 《中国惯性技术学报》 EI CSCD 北大核心 2024年第3期308-313,共6页
激光大气数据系统由于系统测量精度较高以及测量区域范围较大,目前尚无有效的高精度标定手段。针对这一问题,提出一种直线折返测速法,可以消除大气中风速的影响,将消除风速影响后的空速数据与GPS-惯性组合导航系统测量的地速数据进行对... 激光大气数据系统由于系统测量精度较高以及测量区域范围较大,目前尚无有效的高精度标定手段。针对这一问题,提出一种直线折返测速法,可以消除大气中风速的影响,将消除风速影响后的空速数据与GPS-惯性组合导航系统测量的地速数据进行对比分析,以评价激光大气数据系统真空速测量性能。分析了所提方法的各类测量误差以及理论极限精度。飞行实验结果表明,所提方法测量精度优于0.5 m/s,接近理论误差极限,可以用来标定激光大气数据系统,为激光大气数据系统标定技术的发展和应用提供参考。 展开更多
关键词 激光大气数据系统 空速 组合导航 系统标定
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国产C波段SAR卫星绝对辐射定标精度验证
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作者 邓明军 陈志远 +2 位作者 张过 刘宁 杨银 《中国空间科学技术(中英文)》 CSCD 北大核心 2024年第5期147-154,共8页
SAR图像测量地球物理参数,实现定量遥感应用,对辐射定标精度有严格要求,因此需要对SAR卫星进行辐射定标精度验证。通过雷达方程推算出雷达散射截面积、定标常数与图像DN值三者之间的关系,并利用宁夏中卫定标场有源定标器及其SAR图像做... SAR图像测量地球物理参数,实现定量遥感应用,对辐射定标精度有严格要求,因此需要对SAR卫星进行辐射定标精度验证。通过雷达方程推算出雷达散射截面积、定标常数与图像DN值三者之间的关系,并利用宁夏中卫定标场有源定标器及其SAR图像做定标验证实验。实验结果表明,高分三号02星数据绝对辐射定标精度较高,其中积分法辐射定标精度为0.65 dB,而峰值法定标精度为0.57 dB;海丝1号卫星数据辐射定标精度为1~2 dB,计算定标常数时保持相同波位可有效提高定标常数的稳定性。 展开更多
关键词 绝对辐射定标 绝对定标常数 积分法 峰值法 波位
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时间信息的贝叶斯优化知觉
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作者 陈有国 彭春花 +1 位作者 刘培朵 余婕 《心理科学》 CSSCI CSCD 北大核心 2024年第1期11-20,共10页
大脑运用贝叶斯推理加工时间信息形成优化知觉。贝叶斯模型在趋中效应、多源时间信息整合、时空干扰效应以及同时性的贝叶斯校准这四个课题上取得了较大的进展。本文在测量-估计-决策三阶段模型的框架下,对以上课题中的贝叶斯模型进行... 大脑运用贝叶斯推理加工时间信息形成优化知觉。贝叶斯模型在趋中效应、多源时间信息整合、时空干扰效应以及同时性的贝叶斯校准这四个课题上取得了较大的进展。本文在测量-估计-决策三阶段模型的框架下,对以上课题中的贝叶斯模型进行分析。未来需检验不同形式的时间信息先验的合理性,厘清似然性的心理表征,探明时间信息贝叶斯估计的神经基础。应该结合时间信息加工模型与贝叶斯模型的优势,为时间信息加工的认知神经机制研究提供新的思路。 展开更多
关键词 时间信息 贝叶斯推理 趋中效应 时间信息整合 时空干扰效应 同时性的贝叶斯校准
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路侧多传感器融合中的联合标定优化设计
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作者 佘锋 杨贵永 +1 位作者 刘建虎 王平 《同济大学学报(自然科学版)》 EI CAS CSCD 北大核心 2024年第11期1750-1757,共8页
在路侧感知中,交通场景复杂多变,单类传感器无法满足全天候、全天时工作的要求,多传感器融合逐渐成为发展趋势,而多传感器融合的前提是实现传感器之间的联合标定。在激光雷达和相机的共视区内摆放标定物,从而获得特征点的点云坐标和对... 在路侧感知中,交通场景复杂多变,单类传感器无法满足全天候、全天时工作的要求,多传感器融合逐渐成为发展趋势,而多传感器融合的前提是实现传感器之间的联合标定。在激光雷达和相机的共视区内摆放标定物,从而获得特征点的点云坐标和对应像素坐标,再使用EPnP(Efficient Perspective-n-Points)算法求得激光雷达和相机之间的外参;对激光雷达路面的点云进行上采样,根据联合标定的外参矩阵生成对应的像素坐标,然后采用决策树回归、随机森林回归算法训练模型;根据激光雷达标定的结果实现像素坐标到WGS84坐标的转换,该方法不需要将激光雷达和相机集成在一起。最后,经实验验证该联合标定方案的有效性。 展开更多
关键词 联合标定 路侧感知 多传感器融合 车路协同
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基于霍尔脉宽的汽车天窗防夹标定系统设计
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作者 黄健 陈星 +2 位作者 曹士强 冯博 陈时康 《传感器与微系统》 CSCD 北大核心 2024年第10期84-87,91,共5页
为解决传统防夹系统对实际行驶环境适应性低、算法参数难以确定的问题,设计了一种基于霍尔脉宽的汽车天窗防夹标定系统。使用霍尔传感器监测天窗电机的运行状态,根据霍尔脉宽与夹紧力的近似正比关系触发防夹功能,同时利用卡尔曼滤波器... 为解决传统防夹系统对实际行驶环境适应性低、算法参数难以确定的问题,设计了一种基于霍尔脉宽的汽车天窗防夹标定系统。使用霍尔传感器监测天窗电机的运行状态,根据霍尔脉宽与夹紧力的近似正比关系触发防夹功能,同时利用卡尔曼滤波器和脉宽积分算法减少了噪声引发的误防夹操作。通过基于CAN总线的标定协议,建立了一种车载领域通用的标定系统,实验标定了不同供电电压和路面状况下防夹算法的实际参数值,取得了较好的防夹效果,满足了天窗防夹系统对环境适应能力的要求。 展开更多
关键词 霍尔传感器 标定系统 卡尔曼滤波器 脉宽积分
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基于数值积分法的无源效率刻度方案研究
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作者 熊超 袁新宇 +1 位作者 王欣 吴和喜 《核电子学与探测技术》 CAS 北大核心 2024年第1期146-152,共7页
无源效率刻度技术一直是核分析领域研究的热点,但现行无源效率刻度技术需依据指定探测器进行订制。基于伽马射线指数衰减规律推导了圆柱体探测器周边任意位置点源探测效率的数值积分公式。依据探测器与待测物几何结构的轴对称性和伽马... 无源效率刻度技术一直是核分析领域研究的热点,但现行无源效率刻度技术需依据指定探测器进行订制。基于伽马射线指数衰减规律推导了圆柱体探测器周边任意位置点源探测效率的数值积分公式。依据探测器与待测物几何结构的轴对称性和伽马场叠加原理,构建了实验室常用几何结构体源的探测效率计算方案。在笔记本电脑(CPU:i5-8250U@1.60 GHz;RAM:8.0 GB)上应用上述方法计算HPGe圆柱体探测器对马林杯水体和NaI圆柱体探测器对圆柱体土壤内多种能量特征伽马射线的探测效率,发现探测效率计算值与实验值之间相对偏差为-4.9%~3.9%,且计算时长最大为35.78秒,证实本方法能准确、快速地实现圆柱体探测器的无源效率刻度。且本文推荐方法在探测器尺寸变化的情况下仅需修改相应参数,具有很强的通用性。 展开更多
关键词 无源效率刻度 圆柱体探测器 数值积分法
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分布动载荷时域识别的动标定试验方法
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作者 陈奥辉 姜金辉 《南京航空航天大学学报》 CAS CSCD 北大核心 2024年第3期561-570,共10页
在工程应用中,作用于工程结构上的载荷多为分布载荷,因此分布载荷识别技术一直备受关注。动标定技术通过建立载荷与响应之间的关系识别载荷,传统动标定方法根据有限元仿真获得标定矩阵,识别结果受到模型误差影响。基于Gauss-Legendre积... 在工程应用中,作用于工程结构上的载荷多为分布载荷,因此分布载荷识别技术一直备受关注。动标定技术通过建立载荷与响应之间的关系识别载荷,传统动标定方法根据有限元仿真获得标定矩阵,识别结果受到模型误差影响。基于Gauss-Legendre积分将无限维的动标定转换为有限维的动标定,通过傅里叶逆变换和卷积积分得到时域标定矩阵,对施加于结构上的分布载荷进行时域识别,并用仿真验证了该方法的有效性和高精度。在响应中加入噪声,考察该方法的抗噪性,并与传统仿真标定方法进行对比,并讨论了不同高斯点总数对识别精度的影响。 展开更多
关键词 分布载荷识别 试验动标定 Gauss-Legendre积分 正交多项式 时域
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