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2008 3rd International Conference on Sensing Technology最新文献

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Investigation on the dependency of the electrical capacitance on the moisture content of wood pellets 木屑颗粒电容量与含水率关系的研究
Pub Date : 2008-11-01 DOI: 10.1109/ICSENST.2008.4757188
A. Fuchs, M. Moser, H. Zangl
This paper discusses approaches for online moisture determination of wood pellets by means of capacitive sensing. Two different electrode topologies, one based on parallel plates and the other on a planar structure, are analysed and tested using a laboratory prototype in a drying chamber. In a further investigation, the susceptibility of the topologies on the orientation of tested wood pellets is examined.
本文讨论了用电容传感技术在线测定木屑颗粒水分的方法。两种不同的电极拓扑结构,一种基于平行板,另一种基于平面结构,分析和测试使用实验室原型在干燥室。在进一步的调查中,拓扑结构对测试木屑颗粒取向的敏感性进行了检查。
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引用次数: 2
Automotive radar data filtering approach for Adaptive Cruise Control systems 自适应巡航控制系统的汽车雷达数据滤波方法
Pub Date : 2008-11-01 DOI: 10.1109/ICSENST.2008.4757064
M. Gholamhossein, H. Khaloozadeh
Today automotive radar systems are widely used in automotive safety systems such as adaptive cruise control (ACC). Adaptive cruise control (ACC) automatically maintains the vehicle speed (desired speed) and safe time gap from the vehicle ahead. Automotive radar systems offer the capability to measure simultaneously range and azimuth angle of observed objects inside the observation area. In addition, to achieve accurate and reliable measurement results of the target inside the observation area, the knowledge of target tracking maneuver (preceding vehicle acceleration) is necessary. Many researchers combine the ACC system with other additional hardware such as GPS for radar data correction. In this paper, we used an augmented state space system for preceding vehicle dynamic by taking the acceleration term, as a new state. Then extended Kalman filter (EKF) is applied to the new preceding vehicle system. The positions, relative velocities, and the accelerations of the preceding vehicle are estimated and they are used by the host controller. Hence more accurate data from automotive radar system without using any additional hardware is achieved. In the end, a conventional controller is applied to the system. Simulation results show a very good gap keeping result based on the radar data correction.
目前,汽车雷达系统已广泛应用于自适应巡航控制(ACC)等汽车安全系统中。自适应巡航控制(ACC)自动保持车辆速度(期望速度)和与前方车辆的安全时间差距。汽车雷达系统提供了同时测量观测区域内被观测物体的距离和方位角的能力。此外,为了获得准确可靠的观测区域内目标的测量结果,需要了解目标跟踪机动(前车加速度)。许多研究人员将ACC系统与其他附加硬件(如GPS)相结合,用于雷达数据校正。本文将加速项作为一种新的状态,采用一种增强的前车动力学状态空间系统。然后将扩展卡尔曼滤波(EKF)应用于新的前车系统。预估前车的位置、相对速度和加速度,并由主控制器使用。因此,在不使用任何额外硬件的情况下,从汽车雷达系统获得更准确的数据。最后,采用常规控制器对系统进行控制。仿真结果表明,在雷达数据校正的基础上,保持间隙的效果很好。
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引用次数: 0
Reliable grouping GAF algorithm using hexagonal virtual cell structure 基于六边形虚拟单元结构的可靠分组GAF算法
Pub Date : 2008-11-01 DOI: 10.1109/ICSENST.2008.4757176
Chuan-Yu Cho, Cheng-Wei Lin, Jia-Shung Wang
Energy consumption and routing fidelity are two of the most concerns in developing protocols and algorithms for wireless sensor networks. GAF is one of the most popular algorithms which can not only conserve energy but also keep the routing fidelity. GAF conserves energy by using geographic location information to identify the equivalence between nodes and then turn off their radio accordingly. However, the grid based equivalence is not consistent with the true radio diffusion nature so that the efficiency is not good enough. In this paper, analyses on the virtual grid structures are discussed and a new grouping GAF algorithm using hexagonal virtual cell is then proposed. Ideally, the proposed algorithm wakes up only 51.96% of nodes that GAF does without losing any network connectivity. Simulation results show that only 50.69% nodes have to be kept awaked comparing to GAF with only additional 1.16% packet delay.
能量消耗和路由保真度是开发无线传感器网络协议和算法时最关心的两个问题。GAF算法是目前最流行的一种算法,它既节省了能量,又保证了路由的保真度。GAF通过使用地理位置信息来识别节点之间的等效性,然后相应地关闭它们的无线电,从而节省能量。然而,基于网格的等效并不符合无线电扩散的真实性质,因此效率不够好。本文对虚拟网格结构进行了分析,提出了一种基于六边形虚拟单元的GAF分组算法。理想情况下,该算法在不丢失任何网络连接的情况下,仅唤醒GAF的51.96%的节点。仿真结果表明,与GAF相比,只有50.69%的节点需要保持唤醒,而数据包延迟仅增加1.16%。
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引用次数: 7
Gas sensing performance of pure and modified SrTiO3 thick film resistors 纯SrTiO3和改性SrTiO3厚膜电阻器的气敏性能
Pub Date : 2008-11-01 DOI: 10.1109/ICSENST.2008.4757140
D. D. Kajale, V. Gaikwad, G. Jain, P. Khanna
Strontium titanate (SrTiO3 (ST)) was prepared mechanochemically from Sr(OH)2 and TiO2. XRD confirms the pervoskite phase of material. Thick films of ST were prepared by screen-printing technique. The gas sensing performance of thick films were tested for various gases. It showed maximum sensitivity to CO gas at 350degC for 100 ppm gas concentration. To improve the sensitivity and selectivity of the film towards a particular gas, ST thick films were surface modified by dipping them in a solution of nano copper for different intervals of time. These surface modified ST films showed larger sensitivity to H2S gas (100 ppm) than pure ST film. A systematic study, of sensing performance of the sensor, indicates the key role-played by the nano copper species on the surface .The sensitivity, selectivity, response and recovery time of the sensor were measured and presented.
以Sr(OH)2和TiO2为原料,采用机械化学方法制备了钛酸锶(SrTiO3 (ST))。XRD证实材料为钙钛矿相。采用丝网印刷技术制备了ST厚膜。测试了厚膜对各种气体的气敏性能。当气体浓度为100 ppm时,对350℃的CO气体灵敏度最高。为了提高薄膜对特定气体的灵敏度和选择性,通过将ST厚膜浸在纳米铜溶液中不同时间的方法对其进行表面改性。这些表面改性的ST膜对H2S气体(100 ppm)的敏感性高于纯ST膜。对传感器的传感性能进行了系统的研究,指出了表面纳米铜的种类对传感器的传感性能起着关键作用,并测量了传感器的灵敏度、选择性、响应和恢复时间。
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引用次数: 1
Measurements of Cerenkov radiations in a scintillating fiber-optic dosimeter using a photodiode and a charge-coupled device 用光电二极管和电荷耦合装置测量闪烁光纤剂量计中的切伦科夫辐射
Pub Date : 2008-11-01 DOI: 10.1109/ICSENST.2008.4757151
K. Jang, S. Shin, D. Cho, W. Yoo, J. Seo, Soon-Cheol Chung, Bongsoo Lee, B. Park, J. Moon, Hyosung Cho, Sin Kim
Usually, two kinds of light signals such as scintillating and Cerenkov light are generated in a fiber-optic dosimeter when a high energy electron beam is irradiated. The objectives of this study are to measure, characterize and remove a Cerenkov light generated in a scintillating fiber-optic dosimeter. The intensity of Cerenkov light is measured and characterized as a function of incident angle of electron beam from a linear accelerator, as a function of electron beam energy, and as a function of electron beam size using a photodiode amp system and a charge-coupled device. Also, a subtraction method using a background optical fiber without a scintillator is investigated to remove a Cerenkov light.
通常,当高能电子束照射在光纤剂量计中时,会产生闪烁光和切伦科夫光两种光信号。本研究的目的是测量、表征和去除闪烁光纤剂量计中产生的切伦科夫光。利用光电二极管放大器系统和电荷耦合装置测量了切伦科夫光的强度,并将其表征为线性加速器电子束入射角的函数、电子束能量的函数和电子束尺寸的函数。此外,本文还研究了一种利用无闪烁体的背景光纤去除切伦科夫光的方法。
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引用次数: 0
Sizing of back-surface flaws by piezoelectric highpolymer film 压电高聚物薄膜对背表面缺陷的施胶
Pub Date : 2008-11-01 DOI: 10.1109/ICSENST.2008.4757158
A. Yamamoto, S. Biwa, E. Matsumoto
Piezoelectric thin film has been used to visualize back surface flaws in plates. If the plate with a surface flaw is deformed, the strain distribution appears on the other surface reflecting the location and the shape of the flaw. Such surface strain distribution can be transformed into the electric potential distribution on the piezoelectric film mounted on the plate surface. The purpose of this paper is to estimate the size of a back-surface flaw from the electric potential distribution. The numerical simulation of this technique for various sizes of flaws implies that the depth and the width of the surface flaw are related together with the height and the width of the potential peak. From the experimental verification on acrylic specimens with surface flaws, it is observed that the flaw depth can be exactly estimated but the width can not be.
压电薄膜已被用于观察板的背面缺陷。如果表面有缺陷的板材发生变形,则在另一个表面上出现应变分布,反映缺陷的位置和形状。这种表面应变分布可以转化为安装在板表面的压电薄膜上的电势分布。本文的目的是从电位分布估计背表面缺陷的大小。对不同尺寸缺陷的数值模拟表明,表面缺陷的深度和宽度与电位峰的高度和宽度有关。通过对表面有缺陷的亚克力试件进行实验验证,发现缺陷深度可以准确估计,但宽度不能准确估计。
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引用次数: 1
A scalable tracking system using ultrasonic communication 利用超声波通信的可扩展跟踪系统
Pub Date : 2008-11-01 DOI: 10.1109/ICSENST.2008.4757068
Toshio Ito, Tetsuya Sato, Kan Tulathimutte, M. Sugimoto, H. Hashizume
Recently a new method of indoor ultrasonic localisation was introduced. It is called the phase accordance method and the authors claim that with this technology they could measure the 2D coordinates of the transmitter by a single receiver and a single transmission of ultrasound. Also this method is reported to be able to locate static objects more accurately than conventional methods. In this paper we evaluated the ability of the method to locate moving objects. Experiments with a prototype system and a moving robot were conducted, which showed satisfying results. Issues to be investigated in the future work are described.
介绍了一种新的室内超声定位方法。这被称为相位一致法,作者声称,通过这种技术,他们可以通过单个接收器和单个超声波传输来测量发射器的二维坐标。此外,据报道,这种方法能够比传统方法更准确地定位静态物体。在本文中,我们评估了该方法定位运动目标的能力。在原型系统和移动机器人上进行了实验,取得了满意的效果。介绍了今后工作中需要研究的问题。
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引用次数: 12
Evaluation of cross-validation formulas for choosing the regularization parameter for inversion of Fredholm integral of the first kind with non-negativity constraints 非负性约束下第一类Fredholm积分反演正则化参数选择的交叉验证公式评价
Pub Date : 2008-11-01 DOI: 10.1109/ICSENST.2008.4757119
Carlo Pariset, S. Thennadil
The inversion of Fredholm integral equation of the first kind is encountered in many applications where measurements have to be inverted to obtain information of a distribution of property values. Such problems can be solved using regularization techniques. The central issue in regularization techniques is the choice of an effective regularization parameter and it is desirable that this choice is made in an objective and automatic manner so that it is practical for use in online monitoring applications. In this work, two formulations based on cross-validation which account for non-negativity constraints are considered to search for the optimal regularization parameter. These are evaluated by applying to simulations of two different problems viz. the estimation of the distribution of adsorption energies and the extraction of particle size distributions from turbidity measurements. It was found that of the two methods for computing the cross-validation scores, one was computationally intensive but robust in that the search range of the regularization parameter can be broad. The second formula while much simpler and computationally faster provided a reliable regularization parameter only when a sufficiently narrow search range is used. This study indicates that a two-step approach which combines the two formulations could provide a method that will strike a balance in terms of computational speed while at the same time providing reliable values of the regularization parameters.
第一类Fredholm积分方程的反演在许多需要对测量值进行反演以获得性质值分布信息的应用中都遇到过。这样的问题可以用正则化技术来解决。正则化技术的核心问题是选择有效的正则化参数,并且希望以客观和自动的方式进行选择,以便在在线监测应用中实际使用。在这项工作中,考虑了考虑非负性约束的两种基于交叉验证的公式来搜索最优正则化参数。通过应用于两个不同问题的模拟来评估这些问题,即吸附能分布的估计和从浊度测量中提取粒度分布。研究发现,在计算交叉验证分数的两种方法中,一种方法计算量大,但鲁棒性好,因为正则化参数的搜索范围可以很宽。第二个公式虽然更简单,计算速度更快,但只有在使用足够窄的搜索范围时才提供可靠的正则化参数。本研究表明,结合两种公式的两步方法可以提供一种在计算速度方面取得平衡的方法,同时提供可靠的正则化参数值。
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引用次数: 4
Study on a pyruvate oxidase biosensor based on ß-cyclodextrin included ferrocene as electron-transfer mediator 以二茂铁为电子传递介质的ß-环糊精丙酮酸氧化酶生物传感器的研究
Pub Date : 2008-11-01 DOI: 10.1109/ICSENST.2008.4757136
Tu Yifeng, Long Yu-mei, Deng Kejun
A pyruvic acid biosensor was constructed by the use of ferrocene which was included into the szlig-cyclodextrin as electron transfer mediator as well as glutaraldehyde cross-linked membrane of egg white and szlig-cyclodextrin as matrix of enzyme immobilization. Due to the excellent electron-transfer efficiency of ferrocene, the microenvironment from szlig-cyclodextrin, and also the inclusion complexation between them, the biosensor has quite good properties. The linear detection limiting of this biosensor decreased to 5.68 times 10-7mol/L with the excellent stability for 2.58% of relative standard deviation (RSD) during six individual detections.
以二茂铁作为电子传递介质,以蛋清和什利格-环糊精的戊二醛交联膜为酶固定化基质,构建了丙酮酸生物传感器。由于二茂铁优异的电子传递效率、环糊精的微环境以及它们之间的包合作用,使得该生物传感器具有很好的性能。该传感器的线性检测限降至5.68倍10-7mol/L, 6次检测的相对标准偏差(RSD)为2.58%。
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引用次数: 1
Fabrication of highly efficient fibre-optic gas sensors using SiO2/polymer nanoporous thin films 利用SiO2/聚合物纳米多孔薄膜制备高效光纤气体传感器
Pub Date : 2008-11-01 DOI: 10.1109/ICSENST.2008.4757152
S. Kodaira, S. Korposh, Seung-Woo Lee, W. Batty, S. James, R. Tatam
A highly porous nano-thin film has been deposited on the optical fibre with the aim to develop a fibre-optic gas sensor. The film was composed of alternate layers of poly(diallyldimethyl ammonium chloride) (PDDA) and silica nanoparticles of 40-50 nm in diameter deposited using the electrostatic self assembly process. As a final step of preparation, the coating was infused with the functional compound of tetrakis-(4-sulfophenyl) porphine (TSPP). Exposure of this material to ammonia induces a change in the absorption spectrum, which can be observed in the transmission spectrum of the coated optical fibre. The ammonia sensor shows a linear sensitivity in the concentration range of 0.1-50 ppm and the sensor response and recovery were within 5 min. The sensor was exposed to different chemical compounds in order to study the sensors selectivity.
为了研制光纤气体传感器,在光纤表面沉积了一层多孔纳米薄膜。该薄膜采用静电自组装工艺,由40 ~ 50 nm直径的聚二烯基二甲基氯化铵(PDDA)和二氧化硅纳米颗粒交替沉积而成。作为制备的最后一步,在涂层中注入功能化合物四-(4-巯基)卟啉(TSPP)。将这种材料暴露在氨中会引起吸收光谱的变化,这可以在涂层光纤的透射光谱中观察到。该传感器在0.1 ~ 50ppm的浓度范围内具有良好的线性灵敏度,传感器的响应和恢复在5min以内。为了研究传感器的选择性,将传感器暴露于不同的化合物中。
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引用次数: 14
期刊
2008 3rd International Conference on Sensing Technology
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