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Research on focal length determination technique of laser test system based on Talbot effect

Research on focal length determination technique of laser te...

4th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical Test and measurement technology and Equipment

作者： Wu, Ling-Ling Zheng, Li Wu, Guo-Jun Cang, Yu-Ping Chen, Liang-Yi Xi'an Institute of Optics and Precision Mechanics Chinese Academy of Sciences Xi'an 710119 China Graduate School of the Chinese Academy of Sciences Beijing 100039 China Measurement and Control Technology and Instrumentation School of Optoelectronic Engineering Xi'an Technological University Xi'an 710032 China Henan Institute of Metrology Zhengzhou 450008 China

ISBN: (纸本)9780819475435

A method for measuring focal length based on Talbot effect is put forward, which suits determining focal length of long-focus lens. The variation of Moiré fringes occurs after typical phase object of measuring lens is laid between two gratings. The images of fringes taken by CCD camera are processed with MATLAB. The focal length of measuring lens is figured out accurately after calculating the slope of fringes, the separation angle between two grating lines and measuring the distance between lens and the second grating. Experimental data indicate that, for a system with laser wavelength of 0.65m, measuring lens wth focal length of 420mm, the measurement accuracy is 0.10%.So this method has advantages of simple device, fast processing speed and high precision. It satisfies focal length determination of long focal-length lens used in SG-III Facility. © 2009 SPIE.

关键词： CCD cameras

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Modified Particle Filter for Object Tracking in Low Frame Rate Video

Modified Particle Filter for Object Tracking in Low Frame Ra...

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Joint 48th IEEE Conference on Decision and control and 28th Chinese control Conference

作者： Tao Zhang Shumin Fei Hong Lu Xiaodong Li the Key Laboratory of Measurement and Control of Complex Systems of Engineering Ministry of EducationInstitute of AutomationSoutheast University the Key Laboratory of Measurement and Control of Complex Systems of Engineering Ministry of Education Institute of AutomationSoutheast University School of Automation Nanjing Institute of Technology

Object tracking algorithm using modified Particle filter in low frame rate(LFR) video is proposed in this paper,which the object moving significantly and randomly between consecutive frames in the low frame rate ***,Particle filtering use motion transitions to model the movement of the ***,in object tracking with low frame rate sequences,it is very difficult to model significant random jumps of *** key notion of our solution is that using the object detection and extraction to locate the tracked object,while not using the dynamical *** propagate the sample set around the detected regions,which the samples are assumed to be uniformly distributed in the neighborhoods of the detected *** is similar to the general particle filter to propagate *** we compute the likelihood between the target model and the candidate regions,which are based on color histogram *** extensive experiments show that the proposed algorithm performs robustly in a large variety of tracking scenarios.

关键词： frame filter Modified Particle Filter for Object Tracking in Low Frame Rate Video Object Filter

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Failure modes analysis of electromagnetic flowmeter based on failure data statistics

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Yi Qi Yi Biao Xue Bao/Chinese Journal of Scientific Instrument 2009年第SUPPL.期30卷 251-253页

作者： Zhou, Zhen Ma, Dezhong Yu, Xiaoyang Qin, Yong Zhang, Lina College of Measurement-Control Technology and Communications Engineering Harbin University of Science and Technology Harbin 150040 China

Failure criterion of electromagnetic flowmeter is fixed in this paper. The main points in after-sale services records and the process of collecting field failure data are also proposed. And then, it is found that the wrong use by consumer and the fault in main board are primary factors leading to failure of electromagnetic flowmeter by field failure data Statistics. Reasons and modes of failure led by wrong use are further analyzed. These analyses are bases to estimate life distribution and improve the reliability of electromagnetic flowmeter.

关键词： Flow measurement

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New delay-dependent stability criteria for linear stochastic systems with time-varying delay

New delay-dependent stability criteria for linear stochastic...

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Joint 48th IEEE Conference on Decision and control and 28th Chinese control Conference

作者： Jianjiang Yu Kanjian Zhang Shumin Fei the Key Laboratory of Measurement and Control of Complex Systems of Engineering Ministry of Education School of Information Science and Technology Yancheng Teachers University the School of Automation Southeast University

In this paper, the problem of the stability for a class of stochastic systems with time-varying delay is investigated. By dividing the delay interval into multiple segments and choosing different weighting matrices in the new LyapunovKrasovskii functional, the delay-dependent sufficient criterion is derived in terms of linear matrix inequalities(LMIs). Neither model transformations nor bounding techniques for cross terms is employed, so the derived criterion is less conservative than the most existing results. Meanwhile, the computational complexity of the obtained stability conditions is reduced because less variables are involved. A numerical example is given to show the application of the proposed method.

关键词： New delay-dependent stability criteria for linear stochastic systems with time-varying delay

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Modeling of Fermentation Process Based on MOACO and Epsilon-SVM

Modeling of Fermentation Process Based on MOACO and Epsilon-...

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International Conference on Artificial Intelligence and Computational Intelligence (AICI)

作者： Jian-ping Zhu Lin-cheng Zhou Chun-bo Liu Jiangsu College of Information Technology Wuxi China Wuxi Machinery and Electron School Wuxi China School of Communications and Control Engineering Jiangnan University Wuxi China

To establish suitable models to describe the behavior of biochemistry systems, a new modeling method was introduced, combining multiple objective ant colony optimization(MOACO) with the dynamic Epsilon-SVM. The hyper-parameters of Epsilon-SVM were automatically decided by using multiple objective ant colony optimization(MOACO). Each training sample used different error. The model for penicillin production's prediction was developed using the method with data collected from real plant in Matlab7.0. The model possesses strong capability of fitting and generalization. Experiments also show that the dynamic Epsilon-SVM is superior to the standard SVM modeling method. MOACO is very feasible and efficient too.

关键词： Mathematical model Support vector machines Vehicle dynamics Artificial neural networks Ant colony optimization Computer languages Biosensors Risk management Artificial intelligence Computational intelligence

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A dynamic clustering routing algorithm based on support degree for wireless sensor networks

A dynamic clustering routing algorithm based on support degr...

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IEEE International Conference on Intelligent Computing and Intelligent Systems (ICIS)

作者： Jing Yang Baoguo Xu Lu Hong Zhuqing Jiao School of Communications and Control Engineering Jiangnan University Wuxi China Electrical Engineering Guizhou University Guiyang China Department of Electronic Engineering Huaihai Institute of Technology Lianyungang China

For monitoring burst events in a kind of reactive wireless sensor networks (WSNs), a novel scheme of dynamic clustering routing algorithm (DCRA) based on support degree is proposed. The new approach lets sensors decide whether become a clusterhead (CH) according to the support degree coming from neighbors. Unlike traditional distributed clustering algorithms, DCRA combines energy, load balancing and topology information together by defining an objective function based on support degree. Furthermore, the clusterhead aggregates data and transmits the result to base station (sink node) along multiple paths. The new algorithm is completely distributed and location-unaware. Simulation results show that DCRA has great potential in efficiently distributing energy consumption and extending the network lifetime.

关键词： Routing Clustering algorithms Heuristic algorithms Wireless sensor networks Monitoring Load management Network topology Aggregates Base stations Energy consumption

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Ground water level measurements using a segmented resistance sensor

Ground water level measurements using a segmented resistance...

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IEEE Instrumentation and measurement technology Conference

作者： Xianhua Yao Ying-mei Zhang Lin Gao Wuliang Yin Juan Yang Chao Wang The Institute of Measurement and Control Technology University of Technology Taiyuan Shanxi China School of Electrical Engineering and Automation Tianjin University TJU Shanxi China School of Environment and Development University of Manchester Institute of Science and Technology UK

Ground water level measurements are very important for a wide range of applications in geosciences, agriculture, environment monitoring and mining industry. Currently, reliable and automatic ground water level measurements have not been realized. This paper presents the simulation and design of a segmented resistance sensor for measuring ground water level. Based on this sensor design, we have developed an instrument that can automatically log the ground water level. Finite element simulations were performed to optimize the sensor design and to gain insight into its response. Experimental results in the lab and field have verified the usefulness of the sensor.

关键词： Level measurement Geology Agriculture Monitoring Mining industry Electrical resistance measurement Instruments Finite element methods Design optimization Performance gain

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Study on flue gas turbine fault diagnosis technology based on EMD and VPRS

Study on flue gas turbine fault diagnosis technology based o...

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International Conference on Reliability, Maintainability and Safety,ICRMS

作者： Hongjun Wang Hongfeng Wang School of Mechanical & Electronic Engineering Key Laboratory of Modern Measurement & Control Technology S and T University Beijing China Yantai State Economic Technology Development Zone Yantai China

A novel intelligent fault diagnosis model for flue gas turbine based on EMD (Empirical mode decomposition) and VPRS (Variable precision rough set) theories, is proposed in order to solve the difficult problems of knowledge information acquisition and improve fault diagnosis accuracy in practice. This model combines EMD and VPRS techniques. First EMD signal processing technique is employed to excavate the underlying fault information from dynamic signals. The features that reflect the equipment operation conditions from the EMD analysis of the dynamic original vibration signals are extracted and the series of IMFs (intrinsic mode function) feature sets are obtained. Then the energy features of the calculated IMFs are using as the condition attributes of the knowledge acquisition decision table while the fault modes are using as the decision attributes respectively. The decision table is deal with through the attributes' reduction, attributes' value reduction and the rules' reduction based on VPRS theory. The system fault diagnosis rules are extracted on the condition that the model classification ability remains and the redundancy information is removed. The model is applied for the flue gas turbine diagnosis knowledge acquisition and fault diagnosis in Yanshan. The desired diagnosis effect is obtained via the fault diagnosis model based on EMD and VPRS. Moreover, the application result also validates the power and the practice of the model.

关键词： Flue gases Turbines Fault diagnosis Signal processing Knowledge acquisition Power system modeling Signal analysis Data mining Feature extraction Educational technology

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Operator measures and edge sharpness metrics to assess infrared image enhancement

Operator measures and edge sharpness metrics to assess infra...

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32nd International Convention Proceedings: Computers in Education

作者： Hanton, K. Butavicius, M. Sunde, J. Lozo, P. School of Electrical and Information Engineering University of South Australia PO Box 1500 Edinburgh SA 5111 Australia Command Control Communications and Intelligence Division Defence Science and Technology Organisation PO Box 1500 Edinburgh SA 5111 Australia Weapons System Division Defence Science and Technology Organisation PO Box 1500 Edinburgh SA 5111 Australia

ISBN: (纸本)9789532330427

The ability to detect and recognise dangerous objects at a safe distance is a very important task in a number of defence, police and security applications. In this paper we look at ways of improving Infrared images through processes such as Super-resolution image reconstruction and deconvolution methods. In this paper we propose two techniques for assessing image quality improvement: operator assessment and edge detection and report on some initial work recently undertaken. © 2009 by MIPRO.

关键词： Edge detection

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Research on maximum allowable transfer interval of safety critical DCS with prescribed stability

Research on maximum allowable transfer interval of safety cr...

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IEEE International Conference on Mechatronics and Automation

作者： Yuefei Wang Jianghong Han Ye Wu Hao Peng Engineering Research Center of Measurement and Control in Safety Critical Industry Ministry of Education School of Mechanical and Automobile Engineering School of Computer and Information Hefei University of Technology Hefei Anhui China School of Computer and Information School of Instrument Science and Opto-Electronic Engineering Hefei University of Technology Hefei Anhui China

-The dynamic performance quality of SCDCS (Safety Critical Distributed control System) is pertinent to its dependability. To achieve the prescribed dynamic performance, a performance index describing converged speed of system states is established based on the model-building of SCDCS that is networked on its state feedback loop. Meanwhile, a sufficient condition, which can guarantee SCDCS to be asymptotically stable under prescribed performance constraints, is derived by employment of the Lyapunov theory and the matrix measurement. Based on the condition, an algorithm for obtaining maximum allowable transfer interval is presented. Results of simulation indicate that the design method is less conservative and can not only guarantees system asymptotically stable, but also make it have desired dynamic performance.

关键词： Distributed control Stability control systems Vehicle safety Vehicle dynamics Automotive engineering Electrical equipment industry Industrial control Performance analysis Actuators

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