Shape measurement of long microbores applying photon counting method

New technology, especially in the field of microelectronics and mechatronics, created the need for making, positioning and inspection techniques of long microbore-holes and gaps (defined by length/width to diameter ratio l/d > 10 for d < 200 μm). The technological aspect is, in principle, subdued but the metrological one is still unsolved.In Zosel et al. [Zosel J, Guth U, Thies A, Reents B. Flow measurements in micro holes with electrochemical and optical methods. Electrochim Acta 2003;48:3299–305] the properties (power loss and phase distortion) of focused laser microbeam penetrating extremely long through microbores is described; it was proved that the measurement information is distorted depending on the microbore geometry. The samples were prepared of glass–resin laminate with microbore diameter ranging from 35 to 200 μm.In present research an adjustable 100 μm microbore is used as a master. It is formed of mutually accurately adjusted 20 metal plates 100 μm thick set of coaxially in pile. Precise positioning of each plate enables creating free-shaped microbore.The photon batching device emitting 2.5 million photons per second is used as a generator of incident photon beam. The measured transmission efficiency is understood as a relation between outgoing and incoming light energy. The outgoing energy, for particular microbore, was determined by scanning linearly and angularly the bore with photon beam and integrating the results. Experiments were performed in dark room with background 2/5 photons per second (including dark current of photomultiplier).These changes describe the relationship between the shape of the microbore and the transmission energy and can be considered as a measure of microbore cylindricity deviation.     

Analysis of Polycyclic Aromatic Compounds Using Microbore Columns

The gas chromatographic analysis of polycyclic aromatic compounds can be completed faster and with increased chromatographic resolution using microbore columns (Fast GC). Microbore columns contain two to three times the number of theoretical plates per meter when compared to 0.25 mm internal diameter (i.d.) capillary columns. The increased chromatographic resolving power of microbore columns enables separations to be carried out with much shorter columns giving rise to faster analysis times. Analysis times of priority polycyclic aromatic hydrocarbons on 20 m (5% phenyl, 0.1 mm i.d., 0.1 w m film thickness) and 10 m (5% phenyl, 0.1 mm i.d., 0.1 w m film thickness) columns are reduced by about 45% and 60% respectively in comparison with 30 m columns, and data quality (precision and accuracy) is not affected. All areas/parameters of the chromatographic system must be adjusted and optimized to ensure proper chromatographic performance. Smaller injection volumes (0.2-0.5 w L) and injection liners (1-2 mm i.d.) are required to obtain optimum (and reproducible) chromatography on 0.1 mm i.d. columns.     

筛管常用金属微孔网布组合挡砂效果与精度实验研究

金属微孔网布筛管是近年来新兴起的一种防砂筛管,在现场得到了广泛的应用,但是,其防砂机理、网布间的优化组合理论尚不明确。本文应用物理模拟实验方法,研究了金属微孔网布筛管的防砂机理和防砂精度。实验采用水平井流动方式进行模拟,经实验研究结果分析,明确了金属微孔网布组合中各层网布在挡砂过程中的作用,定量的描述了不同网布组合的挡砂精度,并得出了常规架桥理论不适用于金属微孔网布筛管防砂理论的结论,为生产和现场使用提供了一定的理论参考。     

橡胶-塑料微孔材料的性能研究

对橡胶与聚乙烯共混微孔材料进行了静态力学和动态力学性能表征，并通过电镜观察其材料拉伸受力前后的微孔结构变化，了解材料的各种力学行为及材料组份和加工工艺对材料力学性能的影响，同时检验材料的透水性能。