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2019 IEEE International Instrumentation and Measurement Technology Conference (I2MTC)最新文献

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Performance study of a two-electrode type aqueous conductivity sensor for smart farming 智能农业用双电极型水电导率传感器的性能研究
Avishek Adhikary, J. Roy, K. Biswas
This paper presents performance study of a Cu-polymer based two-electrode type conductivity sensor. This sensor was earlier reported only for the small and fixed volume of analyte. In this paper, we discuss the sensor performance (range, accuracy and precision) with large and variable volume of analyte. In this context, the effects of cell structure on the cell constant are studied with COMSOL simulation and based on this study a modification in cell structure is presented to minimize the effect. Proposed modification is substantiated with practical experimentation and test results.
本文研究了一种基于铜聚合物的双电极型电导率传感器的性能。这种传感器在以前的报道中只适用于小体积和固定体积的分析物。在本文中,我们讨论了传感器的性能(范围,准确度和精密度)与大和可变的分析物体积。在此背景下,利用COMSOL模拟研究了细胞结构对细胞常数的影响,并在此基础上提出了一种修改细胞结构的方法来最小化这种影响。实际实验和测试结果证实了所提出的改进方案。
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引用次数: 4
Visualization of in-vitro Blood Vessels in Contrast Images Based on Discrete Wavelet Transform Decomposition 基于离散小波变换分解的对比图像体外血管可视化
F. Lopez-Tiro, H. Peregrina-Barreto, J. Rangel-Magdaleno, J. Ramirez-San-Juan
Visualization of blood vessels in contrast images is an important task as it is used to analyze the dynamics of the blood flow and the health status of biological tissue. However, this task becomes difficult due to the noise in the image, mainly at high depths. This work proposes a methodology based on the Discrete Wavelet Transform to improve in-vitro blood vessels visualization. It also addresses the segmentation of the regions of interest through morphological operations in improved contrast images. Results show that it is possible to visualize the blood vessels even at 700$mu$m below an epidermis phantom.
对比图像中血管的可视化是一项重要的任务,因为它用于分析血流动力学和生物组织的健康状况。然而,由于图像中的噪声,主要是在高深度时,这一任务变得困难。本文提出了一种基于离散小波变换的体外血管可视化方法。它还解决了通过形态学操作在提高对比度图像感兴趣的区域分割。结果表明,即使在表皮假体下方700 μ m处,也可以看到血管。
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引用次数: 3
Investigation on optimal detection position of DC electromagnetic NDT in crack characterization for high-speed rail track 高速铁路轨道裂纹检测中直流电磁无损检测的最佳检测位置研究
Fei Yuan, Yating Yu, Bowen Liu, Linfeng Li
Due to the long-term harsh working environment and cyclic loadings, Rolling Contact Fatigue (RCF) crack will occur on the tread of the rail. Therefore, a fast quantitative detection of cracks periodically is essential to guarantee the operation safety of the high-speed rail track. Electromagnetic Nondestructive testing (NDT) technique is one of the effective methods for quantitative crack characterization in conduction metals. For high-speed Electromagnetic NDT, because of the relative motion between the rail and detection device, motion induced eddy current (MIEC) is generated in the surface of the rail, which causes the magnetic field distribution inside the rail more complicated due to the dragging effect, and the literatures focus on the investigation on the optimal detection position is rare. Hence, to obtain the optimal detection sensitivity and strength, it is essential to investigate the optimal detection position in electromagnetic NDT for crack characterization in high speed. This paper perform a deep investigation on the optimal detection position in direct current (DC) electromagnetic NDT by numerical simulation, and the influence of detecting position on the detecting signal at different speeds is investigated. The results show that the DC Electromagnetic NDT can be used for quantitative crack depth characterization, and the optimal detection position with strongest detection signal and high sensitivity for crack depth characterization is located near the inner edge of the excitation coil on the opposite side of the direction of the probe motion. According to the findings in this paper, the high-speed DC electromagnetic NDT method can be applied to other moving metal components crack characterization, such as rotating metal components and pipelines.
由于长期恶劣的工作环境和循环载荷,钢轨胎面会产生滚动接触疲劳裂纹。因此,定期对裂缝进行快速定量检测,对于保证高速铁路轨道的运行安全至关重要。电磁无损检测技术是定量表征导电金属裂纹的有效方法之一。在高速电磁无损检测中,由于钢轨与检测装置之间的相对运动,在钢轨表面产生运动感应涡流(MIEC),使钢轨内部的磁场分布由于拖拽效应而更加复杂,对最佳检测位置的研究文献较少。因此,为了获得最佳的检测灵敏度和强度,有必要研究高速电磁无损检测中裂纹表征的最佳检测位置。本文通过数值模拟对直流电磁无损检测中的最佳检测位置进行了深入研究,研究了不同速度下检测位置对检测信号的影响。结果表明,直流电磁无损检测可用于裂纹深度定量表征,且检测信号最强、灵敏度高的最佳检测位置位于与探头运动方向相反的激励线圈内缘附近。根据本文的研究结果,高速直流电磁无损检测方法可以应用于其他运动金属部件的裂纹表征,如旋转金属部件和管道。
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引用次数: 6
Scanning Double-Beam Laser Interferometer with Loop-Back Compensation and Phase Stabilization 带回环补偿和相位稳定的扫描双光束激光干涉仪
M. Skalský, J. Fialka, Z. Havránek
An accurate characterization of piezoelectric films is essential for their usage in various types of MEMS sensors and actuators. This paper presents a novel scanning double-beam laser interferometer (DBLI) to measure the thickness piezoelectric coefficient with a high accuracy. Compared to previous DBLI solutions, we employ a closed-loop phase shift compensation via an electro-optical modulator to stabilize the random phase drift as well as to compensate the harmonic sample-induced phase shift. As a consequence, the setup robustness is enhanced and the measured displacement is no more sensitive to sample reflectivity or source and detector signal gains, which allows to use the DBLI as scanning.
压电薄膜的准确表征对于其在各种类型的MEMS传感器和执行器中的使用至关重要。本文提出了一种新型扫描双光束激光干涉仪(DBLI),用于高精度测量厚度压电系数。与以前的DBLI解决方案相比,我们通过电光调制器采用闭环相移补偿来稳定随机相移以及补偿谐波采样引起的相移。因此,设置鲁棒性得到增强,测量位移对样品反射率或源和检测器信号增益不再敏感,这允许使用DBLI作为扫描。
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引用次数: 0
Blade Tip Timing: from Raw Data to Parameters Identification 叶尖定时:从原始数据到参数识别
Shuming Wu, Xuefeng Chen, P. Russhard, Ruqiang Yan, Shaohua Tian, Shibin Wang, Zhibin Zhao
Blade Tip Timing (BTT) methods have been increasingly implemented for blade health monitoring. However, most of them are based on the prior knowledge that the resonance’s location is known. Since real BTT test usually takes more than ten hours, it’s unrealistic to Figure out every resonance from the measured raw data manually. Furthermore, BTT data analysis suffers from its inherent under-sampled and non-uniform shortcoming. In this paper, we present a simple yet effective method for BTT-based blade health monitoring. The method starts with an automatic resonance recognition, where cross-correlation and Savitzky Golay filter are used to locate the resonance region. Then an adaptively reweighted least-squares periodogram algorithm is designed to identify parameters of the resonant vibration. The effectiveness of the algorithm was tested using both simulation and real test data.
叶尖定时(BTT)方法越来越多地应用于叶片健康监测。然而,它们大多是基于共振位置已知的先验知识。由于实际的BTT测试通常需要10个小时以上,从测量的原始数据中手动计算出每个共振是不现实的。此外,BTT数据分析还存在固有的欠采样和非均匀性缺点。本文提出了一种简单有效的基于btt的叶片健康监测方法。该方法从自动共振识别开始,利用互相关和Savitzky - Golay滤波对共振区域进行定位。然后设计了一种自适应加权最小二乘周期图算法来识别谐振振动的参数。通过仿真和实际测试数据验证了算法的有效性。
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引用次数: 10
Verification for Electrical Tomography in Flame Monitoring by Ion Probe 离子探针火焰监测中的电断层扫描验证
Die Hu, Lijun Xu, Z. Cao, Shijie Sun, Jiangtao Sun
Electrical tomography has been used to monitor the processes of flame ignition, fluctuation and extinction. To obtain more quantitative and key information of the flame from images of conductivity and permittivity distributions, a calibration method is necessary for studies on different combustors. In this paper, the ion probe sensor is proposed as a means of verification for electrical tomography in flame monitoring. From the impedance data of the ion probe, the local conductivity and permittivity can be calculated. Both an ion probe sensor and an electrical tomography system were experimented on an alcohol lamp. The ion probe experiment results are that the conductivity increased from $2times 10^{-6}$ to $9times 10^{-6} rm{{S}/{m}}$, while the relative permittivity increased from 1 to 4 in the flame. The ranges of electrical tomography images are that conductivity from 0 to $6times 10^{-6} rm{{S}/{m}}$ and relative permittivity from 1 to 4.5, which are consistent with the data acquired from the ion probe.
电断层扫描已被用于监测火焰的点火、波动和熄灭过程。为了从火焰的电导率和介电常数分布图像中获得更多的定量和关键信息,对不同燃烧室的研究需要一种校准方法。本文提出了离子探针传感器作为火焰监测中电层析成像的验证手段。根据离子探针的阻抗数据,可以计算出局部电导率和介电常数。在酒精灯上对离子探针传感器和电断层扫描系统进行了实验。离子探针实验结果表明,火焰中的电导率由$2 × 10^{-6}$增加到$9 × 10^{-6}$ rm{{S}/{m}}$,相对介电常数由1增加到4。电导率范围为0 ~ $6 × 10^{-6} rm{{S}/{m}}$,相对介电常数范围为1 ~ 4.5,与离子探针测得的数据一致。
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引用次数: 4
Research on Low Water Volume Fraction Measurement of Two-Phase Flow Based on TM010 Mode Microwave Cavity Sensor 基于TM010型微波腔传感器的两相流低体积分数测量研究
Yiguang Yang, Ying Xu, Tao Zhang
Two-phase flow of gas-water and oil-water with low water volume fraction is common working conditions in the industrial process. For the measurement of 0-10% low water volume fraction, a microwave resonance sensor based on TMoto mode was proposed. The results of theoretical analysis and Ansoft HFSS simulation showed that the resonant frequency of TMoto resonator monotone decreased significantly with water volume fraction increasing. The static experiment of the gas-water two-phase medium was carried out. The results showed that the sensor can detect the change of gas-water two-phase medium with 0-10% water volume fraction. The consistency between simulation and experiment was analyzed. The results showed that Ansoft HFSS simulation can reflect the resonant frequency variation of the cavity, and relative error was less than 7% within the range of 0-10%.
低水体积分数的气水和油水两相流是工业生产过程中常见的工况。针对0 ~ 10%低水体积分数的测量,提出了一种基于TMoto模式的微波谐振传感器。理论分析和Ansoft HFSS仿真结果表明,随着水体积分数的增加,TMoto谐振器单调的谐振频率显著降低。对气水两相介质进行了静态实验。结果表明,该传感器可以检测0 ~ 10%水体积分数的气水两相介质的变化。分析了仿真结果与实验结果的一致性。结果表明,Ansoft HFSS仿真能较好地反映腔体谐振频率的变化,在0 ~ 10%的范围内,相对误差小于7%。
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引用次数: 5
Development and evaluation of a low-cost delta robot system for weed control applications in organic farming 低成本delta机器人系统在有机农业杂草控制中的应用
S. Hussmann, F. Knoll, A. Meissner, Tim Holtorf
To secure the food supply for future generations it is necessary to increase the automation level in agriculture significantly. One particular problem especially in organic farming is the weeding process. Nowadays the weeding is mostly done by human workers. However this manual weeding is far too expensive and very inhomogeneous. Hence the manual weeding should be replaced by an automated solution. In general a weed control robot system comprises a weed classification and a weed elimination unit. In this paper the development and evaluation of a low-cost delta robot for weed elimination is presented. The performance of the delta robot is illustrated by experimental results.
为了确保子孙后代的粮食供应,有必要大幅提高农业自动化水平。有机农业的一个特别问题是除草过程。现在,除草大多由人工完成。然而,这种人工除草太昂贵了,而且非常不均匀。因此,人工除草应该被自动化解决方案所取代。一般来说,杂草控制机器人系统包括杂草分类和杂草清除单元。本文介绍了一种低成本delta除草机器人的研制与评价。实验结果验证了delta机器人的性能。
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引用次数: 8
Secondary Peak Separation of Remote Field Eddy Current Testing in Ferromagnetic Pipes 铁磁管道远场涡流检测的二次峰分离
Hu Sun, Yibing Shi, Xuyang Gao, Wei Zhang
Since the magnetic field signal will penetrate the pipe’s wall twice in Remote Field Eddy Current(RFEC) Testing, the receiver’s signal arises two peaks when the pipe exists defects, which are called first peak and second peak separately. And the second peak is a disturbance for the location of defects, it will cause incorrect results in pipe evaluation. For the sake of eliminating the disturbance in RFEC testing, a method based on Radial Basis(RB) function and Nelder-Mead Simplex Method(NMSM) was introduced and part of RB functions were chosen for removing second peak. Simulation results demonstrate that the proposed method can eliminate the disturbance efficiently based on one receiver.
由于在RFEC测试中磁场信号会两次穿透管壁,因此当管道存在缺陷时,接收端信号会出现两个峰值,分别称为第一个峰值和第二个峰值。第二峰是对缺陷定位的干扰,会导致管件评价结果不正确。为了消除RFEC测试中的干扰,提出了一种基于径向基(RB)函数和Nelder-Mead单纯形法(NMSM)的方法,并选择部分RB函数去除第二峰。仿真结果表明,该方法可以有效地消除单接收机的干扰。
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引用次数: 1
Choosing number of basis functions in weighted least-squares method for fusion of measurement data used for persons’ monitoring 基于加权最小二乘法的基函数个数选择,实现了人体监测测量数据的融合
P. Mazurek, Jakub Wagner, R. Morawski
The research reported in this paper is related to the fusion of measurement data from the impulse-radar sensors and infrared depth sensors applied in a system for unobtrusive monitoring of elderly persons. The investigated method of data fusion consists in the approximation of a sequence of measured data by means of a linear combination of linearly independent basis functions, while the parameters of the approximation are determined using a weighted least-squares estimator. The proposed method is provided with the automatic determination of the number of basis functions by means of the so-called Stein’s unbiased risk estimator. Results of the numerical experimentation–performed on both synthetic data and real-world data-show that the proposed approach allows for robust estimation of the monitored person’s position regardless of the trajectory shape and person’s walking velocity.
本文研究的是脉冲雷达传感器和红外深度传感器测量数据的融合,并将其应用于老年人无干扰监测系统中。所研究的数据融合方法是通过线性无关基函数的线性组合对一系列测量数据进行逼近,并使用加权最小二乘估计确定逼近的参数。该方法通过所谓的Stein无偏风险估计量自动确定基函数的个数。在合成数据和真实世界数据上进行的数值实验结果表明,所提出的方法允许对被监测人员的位置进行鲁棒估计,而不考虑轨迹形状和人的行走速度。
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引用次数: 2
期刊
2019 IEEE International Instrumentation and Measurement Technology Conference (I2MTC)
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