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Key engineering materials
Trans Tech Publications Ltd.
Key engineering materials

Trans Tech Publications Ltd.

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1013-9826

Key engineering materials/Journal Key engineering materials
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    Auto Focusing Confocal Laser Induced Fluorescence Detection System

    Xuefei WangWeiping YanHaiming BaiWei Li...
    P.364-368页
    查看更多>>摘要：Laser induced fluorescence (LIF) detection is one of the main means of Capillary Electrophoresis (CE) chip detection, in which the confocal detecting device is commonly used for its higher sensitivity and signal-to-noise ratio (SNR). Based on confocal LIF detection principle, the confocal laser induced fluorescence detecting system, which could realize the auto focusing, and auto tracking was presented, and it contained the confocal optical system, the microprocessor control system and the computer process system. This device can acquire the fluorescence data by PMT or the chip images by CCD, and 3-dimensional electric moving stage could be controlled to accomplish the auto focusing and auto tracking by image process. The device could detect or observe the CE chip data in real time.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Study on Measuring System for Characteristics and Distribution of Skylight Polarization

    Yan CuiJinkui ChuNannan CaoKaichun Zhao...
    P.369-373页
    查看更多>>摘要：A new system has been developed and calibrated to measure the characteristics and distribution of skylight polarization. With a series of measurements obtained, we verified that the distribution of degree and angle of skylight polarization accords well with the predictions of Rayleigh scattering. The differences of the characteristics and distribution of skylight polarization across the principal plane owning to measurements' errors have been analyzed and discussed.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    A Preliminary Study of Micro Heat Conduction by Hot-Tip Tribological Probe Microscope

    Zhaoyang YueXianping Liu
    P.374-378页
    查看更多>>摘要：Scanning thermal microscopy (SThM) and infrared thermography are widely used for surface thermal characterization. However, the SThM technique is limited by measurement of the non-electrical conductive surfaces and the infrared thermography has insufficient spatial resolution for submicron localized thermal measurement. The "hot tip " Tribological Probe Microscope (TPM) has been designed to achieve better localized thermal analysis function in this paper. The schemes of system design are presented and the principle of the 'hot-tip' technique is explained by relating the signals to established thermal properties. After calibrating the lumped thermal resistances (LTR) of the probe and the ambient environment, the LTRs of 5 metal surfaces were measured and compared. In addition, the paper numerically studied the LTR of the indentation interfaces with defined thermal conductivity (TC) by Finite Element Method (FEM). Numerical linearity was observed and fitted between LTR and TC. Based on the measured LTR and the linearity, the deduced TCs of the 5 metal surfaces are agreed well with the reference values.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Information Fusion in Human Eye Aberration Measurement

    Jiabi ChenPeiming ZhangSonglin Zhuang
    P.379-383页
    查看更多>>摘要：An information fusion method measuring human eye aberrations is presented here. We have built an optical setup to combine two systems, which can measure the human eye's objective and subjective wavefront aberration separately. Then the result datum is fused on feature level by information fusion method. Finally, we have done a series of experiments to demonstrate this combined fusion method and give some discussions.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    A Method for Mass Estimation of Loose Parts in Nuclear Power Plant Based on Support Vector Machine

    Huawen ZhengYanlong CaoJiangxin Yang, Yuanfeng He...
    P.384-388页
    查看更多>>摘要：A new method for mass estimation of loose parts in nuclear power plant (NPP) based on the support vector machine (SVM) was proposed. It includes analyses of the relationship between the impact signals' frequency spectrum and the mass of loose part, then formation of a vector consisting of linear predictive coding (LPC) parameters, which represent the shape of spectrum of impact signal. Using the vector as input data and the mass of loose part as the output data to train the SVM, the mass estimation can be done by the trained SVM model. Experimental results show that the method has higher accuracy and easier to achieve than the traditional methods. It provides a new way for mass estimation of loose part in NPP.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Automatic Shape Grading of Pearl Using Machine Vision based Measurement

    Yanlong CaoHuawen ZhengJiangxin YangYuanfeng He...
    P.389-392页
    查看更多>>摘要：A method of automatic shape grading of pearl using machine vision is presented in this paper. Firstly, the preprocessed color image is segmented according to its grey degree histogram. Then the morphological closing operation is adopted to eliminate the noise points. An 8-directional boundary-tracing algorithm is applied to obtain the sequences of the boundary. And then the Euclidean distance between the pearls under checking is compared with ones in the standard template library, which is utilized to distinguish the pearls' shape. Finally the experimental result demonstrates the validity and practicability of this method.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Dynamic Performance of Flow Control Valve Using Different Models of System Identification

    Ho Chang
    P.393-396页
    查看更多>>摘要：This study measures the dynamic characteristics of flow control valve by a self-developed square pressure wave generator (SPWG). Comprised of a revolving shaft and a fixed ring, SPWG generates square pressure waves by the differential function of rotation between these two critical components. With the highly sensitive piezoelectric pressure sensor as the reference sensor, tests are conducted concurrently using a flow control valve. Under the same experimental parameters, the dynamic characteristics of flow control valve are evaluated by four kinds of system identification methods, namely ARX (Auto-Regressive with exogenous input model), ARMAX (Auto-Regressive moving Average with exogenous input model), OE (Output Error model) and BJ (Box-Jenkins model). The experimental results indicate that the dynamic performance of the tested flow control valve for resonance frequency, resonance peak and damping ratio are 1565.6 Hz, 0.9753 db and 0.4044, respectively.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Oil-Filled Isolated High Pressure Sensor for High Temperature Application

    Zhuangde JiangLibo ZhaoYulong ZhaoYuanhao Liu...
    P.397-401页
    查看更多>>摘要：In order to solve pressure measurement problems in the fields of aerospace, petroleum and chemical industry, mobile and military industry, a oil-filled isolated piezoresistive high pressure sensor has been developed with the range of 0～100 MPa, and was able to work reliably under high temperature of above 200 ℃. Based on MEMS (Micro Electro-Mechanical System) and SIMOX (Separation by Implantation of Oxygen) technology, the piezoresistive sensor chip has been developed. By high temperature packaging process, the oil-filled isolated high pressure sensor was fabricated with the sensor chip and corrugated diaphragm. The experimental results showed that the oil-filled isolated high pressure sensor had good performances under high temperature of 200 ℃, such as linearity error of 0.07%FS, repeatability error of 0.04%FS, hysteresis error of 0.03%FS.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Heart Rate Wireless Monitoring System 'Cardiobeat', Novel Approach to ECG Processing and Representation

    Vjacheslav E. AntsiperovYuri V. ObukhovGennady K. Mansurov
    P.402-406页
    查看更多>>摘要：The paper concerns the development of the heart rate wearable wireless monitoring system "CardioBeat". This system has two types of transmission mode, which are total signal transmission and heart rate transmission modes. The developed system uses wireless PAN (Personal Area Network), which operates in low-power mode. It is composed of two main parts: ECG registering circuit with wireless communication module and base station with terminal. The registering circuit has three surface electrodes, ECG amplifier and microcontroller. In total signal transmission mode, it can send data with transmission speed corresponding up to 300 ECG samples per second. In heart rate transmission mode, it can calculate heart rate from ECG data with 300 samples per second and send packets at the specified rate. Base station communication unit forwards the received data to PC, where the data can be stored and displayed. The developed equipment showed the possibility of real-time monitoring of the patients in their daily life and is expected to contribute, in particular, to the saving of medical expenses.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Full-Field Laser Vibrometer for Instantaneous Vibration Measurement and Non-Destructive Inspection

    James M. KilpatrickVladimir B. Markov
    P.407-411页
    查看更多>>摘要：We describe a system for real-time, full-field vibrometry, incorporating features of highspeed electronic speckle pattern interferometry (ESPI) and laser Doppler velocimetry (LDV). Based on a 2D interferometric sensor array, comprising 16×16 parallel illumination and detection channels, the matrix laser vibrometer (MLV), captures full-field data instantaneously, without beam scanning. The instrument design draws on the advantages of scale offered by modern telecommunications fiber optic and digital electronics. The resulting architecture, comprising a compact measurement probe linked by fiber optic umbilical to a remote electronics unit, facilitates practical application to the full-field study of transient vibrations and rapid non-destructive inspection of composite materials.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd