初论工业自动化仪表的选型

介绍了仪表选型过程中应注意的问题,提出了误差理论应用于仪表选型工作中的重要性。从经济的角度指出如何选出真正符合实际需要的高可靠性的仪表。     

Microprocessor-based Spectroscopic Instrumentation

In any research laboratory today, the tremendous impact due to recent advances in microcomputer technology is particularly evident. To demonstrate the efficient use of this small and flexible chip in spectrometry, some experimental procedures for improving laboratory instrumentation are described. Various ways of applying microcomputers, which cover spectropolarimetry, fluorescence spectrophotometry and high-speed spectrometry, indicate that the microprocessor plays an important role not only in data acquisition and display but in waveform processing and instrument control.     

The Design and Performance of an Instrumentation System for Aqueous Film Coating in an Industrial Tablet Coating Machine

In recent years tablet coating has undergone several fundamental changes. The original sugar coating technique has been largely replaced by film coating processes using organic solvents. The organic solvents are now being replaced by water because of the development of suitable polymers, improvements in the coating process, and impending government legislation regulating the discharge of pollutants into the environment.

This change has resulted in increased interest in equipment designed for film coating based on cylindrical shaped side vented pans which allow the drying air to be drawn through the tablet bed. However, the process is complex and requires careful monitoring and control to ensure satisfactory results. The empirically derived conditions are not fundamentally understood and there are important differences in the operation     

Instrumentation on the Internet

The paper presents the development of a practical training system for graduates that allows instruments to be monitored and controlled over the Internet. The system takes the form of an online experiment in which students situated at remote locations can control, and obtain real-time measurements and experimental data from, instruments connected to a host computer via a GPIB interface. The “Internet” element not only provides students with independent and remote access to the experiment, but also gives them an insight into how a GPIB-interconnected system (whether in a laboratory or factory setting) can be remotely monitored and controlled over a long distance. The paper describes both the hardware and software design considerations that have enabled users to manipulate instruments remotely and effectively using a commonly available Web browser     

Instrumentation for fringe multiplication

The paper describes commercial fringe multiplication equipment designed for rapid analysis of frozen stress slices.     

Microprocessor in Biomedical Instrumentation

Present and future trends of microprocessor applications in biomedical instrumentation are discussed, with emphasis on data acquisition. Their expanding role in laboratory and hospital instrumentation is described with a few application examples. A few microprocessor-based instrument architectures for data acquisition are discussed. The advantages and tradeoffs involved in their use in biomedical instrumentation are discussed.     

Instrumentation in Astronomy III

Two-wavelength holography and phase-shifting interferometry are combined to measure the phase contours of deep wavefronts and surfaces, such as those produced by aspherics, with a variable sensitivity. When interference fringes are very closely spaced, the phase data contain high frequencies where 2 ~ ambiguities cannot be resolved. In this technique, the surface is tested at a synthesized longer equivalent wavelength. The phase of the wavefront is calculated modulo 2φ using phase-shifting techniques at each of two visible wavelengths. The difference between these two phase sets is the phase of the wavefront as it would be measured at λ_eq=λ₁λ₂/|λ₁ ? λ₂ |, assuming that 2π ambiguities can be removed at λ_eq. This technique enables surfaces to be contoured to an accuracy of λ_eq/100.     

深亚微米光记录测试仪

详细描述了进行亚微米、深亚微米光记录和探测的测试仪器，其探测功率可达30mW，最小的探测时间为20ns，探测的最小光点200nm左右，带有CCD观察的系统可方便地定位及进行图像处理，整个测量过程均在计算机控制下进行，操作非常方便，它是对高密度光盘材料记录性能进行测量，以及对深亚微米，乃至纳米记录材料进行研究的有效工具。     

Instrumentation for chemical cytometry

Capillary electrophoresis is ideally suited to chemical analysis of individual cells. Small mammalian somatic cells (approximately 15 microns in diameter) can be analyzed by injecting the intact cell into a capillary, lysing the cell, separating and detecting the cellular components, and reconditioning the capillary prior to the next injection. In this paper, we report on technical improvements to single-cell analysis. We designed an inexpensive multipurpose single-cell injector that facilitates the following: (i) monitoring of injection, (ii) reproducible pressure- or electrokinetic-driven injection of the cell, (iii) complete cell lysis by SDS within 30 s of injection, and (iv) pressure-driven capillary reconditioning. Furthermore, we report on the analysis of glycosylation and glycolysis in single human carcinoma cells (HT29 cell line). The reliability and quality of the analysis is confirmed by comparing electropherograms from single cells and those from purified cell extracts.     

Advanced Magnetic Metrology Instrumentation

1. Advancements in Vibrating Sample Magnetometers (VSMs)The VSM is the basic instrument for characterizing magnetic materials as a function of magneticfield and temperature. Its simplicity, versatility andspeed have made it the instrument of choice for bothlaboratory and production environments, ever sinceits invention some forty years ago. Recent advancements in magnetic materials, particularly for the datastorage industry, have imposed new demands on theperformance of VSM systems. They …     

真空电弧沉积技术中的弧源设计

讨论了真空电弧沉积中弧源设计的有关问题 ,如电弧运行模式、电弧极性、点火方式、电弧的约束方式以及宏观粒子抑制方式等。分析表明 ,合理选择电弧运行模式和电弧极性 ,以满足涂料粒子蒸发与离化的要求 ;选择合适的弧源结构 ,加强对电弧的约束与烧蚀的控制 ,或用过滤弧源 ,以抑制宏观粒子对涂层的污染 ,是成功设计弧源的关键