压电晶体传感器利用压电石英晶体振荡频率对晶体表面质量负载和表面性状的高度敏感性,来实现对物质微质量的检测。介绍了压电晶体传感器的原理,给出了检测系统的硬件组成及数据处理与分析软件设计,分析了其应用现状,并对该检测系统的发展趋势进行了展望。

The piezoelectric crystal sensors used the characteristic that the oscillation frequency of the piezoelectric crystal is highly sensitive to the load and properties on crystal surface, such as density, viscosity, conductivity and dielectric constant to carry out materials micro-quality test. Introduction was made to the principle of the piezoelectric crystal sensors. This paper designed the hardware composition, data processing and analysis software of the detection system and analyzed the system’s application actuality, looking forward to the development trend of the detection system.

单晶硅的氧含量及其均匀性可显著影响各种硅基器件的性能,也是在硅晶体生长过程中较难控制的参数。本文分析了直拉单晶硅生产过程中氧杂质的引入机理及其对晶体质量的影响,并通过改变氩气流量或炉内压力、热场几何尺寸、埚位、晶体转速和坩埚转速等拉晶条件,以及采用相应的磁拉技术来控制晶体中的氧含量及分布均匀性,提高晶体的质量。

The oxygen content and its uniformity of single silicon crystal will significantly affect the performance of all kinds of silicon-based apparatus.The parameters of the oxygen content and the uniformity are difficult to be controlled dur-ing silicon crystal growth process.This paper analyzed the mechanism of the introduction of oxygen impurities in czochralski single crystal silicon and the impacts on the quality of the crystal.It can control the crystal oxygen content and distribution uniformity to improve crystal quality by controlling pulling conditions such as changing argon gas flow or furnace pressure, changing thermal field geometry,changing crucible position or changing the crystal and the crucible rotation speed and tak-ing the appropriate magnetic field pulling technologies,so the quality of that was improved.

在多焦点人工晶体实际使用中，影响其成像质量的因素主要有：瞳孔直径、后房深度以及由此引起的偏心、倾斜等。本文通过ZEMAX软件在Liou＆Brennan眼模型基础上进行改进，用ReZoom多焦点人工晶体替代眼模型原有晶体，建立多焦点人T晶体眼模型，模拟上述影响因素的变化，计算不同条件下MTF传递函数并进行比较分析，归纳出各因素对于成像质量的影响。主要结果如下：多焦点人r品体植人人眼后，后房深度、瞳孑L直径、倾斜和偏心对成像质量均有影响。对于后房深度7．8mm，瞳孔直径2mm左右的患者，成像质量最佳，随着瞳孔直径和后房深度的增加，成像质量逐渐下降；另外，如果出现晶体的倾斜和偏心，都会引起成像质量的下降，在倾斜范围3。以内，对成像效果的影响不大。

In the use of MIOL (Multifocal Intraocular Lens), there are three main influencing factors of imaging quality, which are the pupil diameter, posterior chamber depth, and the related eccentricity and tilt. This paper uses the ZEMAX to establish a MIOL eye model by replacing Liou&Brennan eye model’s former lens with ReZoom MIOL, simulate changes in factors, calculate the MTF, dissertates the four factors in theory and analyzes the degree of inlfuence. The main results are as follows:after the MIOL implantation in the human eye, the posterior chamber depth, pupil diameter, tilt and eccentricity all have inlfuence on the imaging quality. The patient who has pupil diameter of 2 mm and posterior chamber depth of 7.8 mm has the best image quality. As the pupil diameter and posterior chamber depth increases, the image quality decreased. In addition, lens tilt and eccentricity will cause a decline in image quality, but less than 3 degrees tilt has little effect on the imaging results.

为了提出测定果糖质量分数的新方案,采用光子晶体平面波展开法进行了理论分析和数值模拟。通过研究以硅半导体材料为背景介质周期性排列空气孔圆柱构成的光子晶体,分别取得了正方晶格和三角晶格的空气孔结构光子晶体的TE模、TM模禁带结构特性。结果表明,在高频率区域,2维正方晶格或三角晶格结构各向同性光子晶体的光子带隙随待测质量分数不同是单调变化的;同时,晶格结构对光子带隙有一定的影响,不论是在正方结构还是三角结构光子晶体中,TE模带隙都比TM模大得多。这对质量分数测量和高血糖患者的临床应用有一定的指导作用。

In order to propose a novel method to measure the mass fraction of fructose,plane wave expansion method for photonic crystal was adopted.A 2-D photonic crystal with a square lattice and triangle lattice of circular cylinders was designed in the Si background semiconductor material.The TE mode and TM mode band gap structure characteristics of square lattice and triangular lattice air hole structure photonic crystal were achieved.The results show that for isotropic photonic crystal of either square or triangular array arrangement,it is easier for the dielectric air type photonic crystal to form TE-polarized mode band gap in high-frequency region.Lattice structure has a certain impact on photonic band gap, TE mode band gap is much larger than the TMmode in both square and triangular structure photonic crystal.The photonic band gap changes with the difference of the mass fraction of the fructose solutions,which are used as the dielectric material in the air hole.

研究了铁钛共掺蓝宝石(Fe, Ti:Sapphire)晶体的常温力学性能.采用泡生法技术生长了尺寸为?180×280 mm3质量为30 kg的Fe, Ti: Sapphire晶体.实验发现,在蓝宝石晶体中掺入Fe2O3和TiO2以及相应的热处理可以显著提高晶体常温断裂强度、表面硬度和断裂韧性,而不损害晶体的可见和近红外透过性能;掺入的Fe2O3其Fe3+对Al3+的取代作用导致晶体内应力的增加,掺入的TiO2其Ti4+热处理时结晶出的第二相针状晶体的韧化效应,均对Fe, Ti: Sapphire晶体的力学性能的提高具有重要作用.研究对我国实现高强蓝宝石晶体应用材料具有重要现实意义.

@@@@Mechanical properties of titanium and iron co-doped Sapphire crystal are first studied at room temperature Large (?180 × 280 mm3 in dimension 30 kg in weight) titanium and iron codoped sapphire single crystal is grown by the Kyropoulos technique It is shown that the fracture strength and surface hardness and fracture toughness of as-grown crystals are significantly improved and the visible-infrared optical property is not adversely affected by titanium and iron codoping and certain heat treatment. The Fe3+ in the doped Fe2O3 palys a role of substituting Al3+, leading to an in creased internal stress in the crystal. And the Ti4+ in the doped TiO2 crystallizes the second phase needle crystal and brings in a toughening effect through certain heat treatment. As a consequence, the mechanical properties of as-grown sapphire are improved at room temperature. The present work has the realistic significance for developing the sapphires of excellent mechanical properties.