一般切割面的铋硅族氧化物光折变增益特性及动态光栅优化

利用耦合张量对光折变旋光，电光，压电及弹光铋硅族氧化物晶体中光波本征模的作用，在任意晶体切割面上求解了弱耦合的矢量波耦合方程, 并利用有效耦合概念处理了非旋光晶体 中的矢量波耦合问题. 进而计算旋光和非旋光材料中信号光的增益, 并分别比较各向同性耦 合和各向异性耦合对增益的影响. 对旋光材料优化增益，并把处理结果应用于BSO和BTO晶体 . 还讨论了压电和弹光效应对(110)，(111)及(112)切割面优化增益的影响. 关键词： 铋硅族氧化物 光折变 旋光效应 压电 弹光效应     

充液层合压电圆柱壳的自由振动

推导得到轴向极化的圆柱型正交各向异性压电弹性力学的三维状态方程，采用细分近似方法，得到了状态方程的解，并建立了圆柱壳内外表面边界量之间的传递关系，分析了内充可压缩流体的层合压电圆柱壳的自由振动问题，给出了频率方程的精确形式，并作了具体计算。     

模糊自整定比例积分控制在空间三维纳米定位台的应用

介绍了一种空间三自由度纳米定位平台,其应用背景为光刻投影物镜波像差检测系统的精密对准,因此对定位精度和定位速度都提出了很高的要求。首先简要介绍了空间三维纳米定位台;然后将模糊控制同传统PI(比例积分)控制相结合,利用定位偏差和偏差变化率信息,通过模糊推理实时调整PI控制参数,并在VC++环境下实现了模糊自整定PI参数的控制算法。实验结果表明,该控制方法较常规PI控制器能够有效地提高响应速度,减小阶跃响应超调量,保证了控制的实时性。     

PVDF压电传感器及敏感单元设计关键技术

研究了聚偏二氟乙烯(PVDF)柔性压电传感器敏感单元设计关键技术和工艺。通过传感器敏感单元设计、电极制作、极化和封装研究实现功能,结合动态冲击压缩实验,对自主研制的PVDF传感器在不同压力段进行标定和A类不确定度评价,实验数据的A类不确定度优于10%,说明所研制的PVDF压电传感器精度高、重复性好,能够满足0.3~10.0 GPa动态冲击压力测量应用需求。目前产品设计水平已达到6级,后续将进一步开展更高压段有效性的应用设计、温度补偿效应研究和工程化产品设计。     

The Detection of Source Levels of Sulfur Dioxide Using a Piezo-Electric Detector and Permeation Membrane

Abstract

The detection of gaseous pollutants using a coated vibrating quartz crystal has been the topic of several studies. Detection of sulfur dioxide with an alkanoamine-coated crystal has already been shown feasible for ambient air pollution levels. Detection of sulfur dioxide at source levels using the piezo-electric method has previously not been proven successful. This work presents the refinements, calibration, and performance of a source monitoring instrument which incorporates a sulfur dioxide permeable membrane as a dilution interface.     

The Detection of Sulfur Dioxide Utilizing a Piezo-Electric Crystal Coated with Ethylenedinitrilotetraethanol

Abstract

A considerable number of compounds have been shown to be sensitive to sulfur dioxide sorption using quartz crystals. To utilize the technique for the continuous measurement of SO₂, coating loss has been shown to be a major limitation. For such a continuously flowing system a previous coating, triethanolamine, was found to evaporate at undesirable rates when used at high enough temperatures and flow rates for an adequate response time. Methods of remedying this problem have led to a new SO2 sensitive coating, ethylenedinitrilotetraethanol. This work presents the technique of coating application, the sensitivity relative to the amount of coating applied, a comparison of totally coated crystals to center coated ones, and a comparison of the new coating relative to the previously used triethanolamine.     

A convenient dynamic loading device for studying kinetics of phase transitions and metastable phases using symmetric diamond anvil cells

We have designed and implemented a novel DLD for controlling pressure and compression/decompression rate. Combined with the use of the symmetric diamond anvil cells (DACs), the DLD adopts three piezo-electric (PE) actuators and three static load screws to remotely control pressure in accurate and consistent manner at room temperature. This device allows us to create different loading mechanisms and frames for a variety of existing and commonly used diamond cells rather than designing specialized or dedicated diamond cells with various drives. The sample pressure compression/decompression rate that we have achieved is up to 58.6/43.3?TPa/s, respectively. The minimum of load time is less than 1?ms. The DLD is a powerful tool for exploring the effects of rapid (de)compression on the structure of materials and the properties of materials.     

微型红外线传感技术的最新发展

综述了红外传感器技术的最新发展，由于应用了薄膜型红外探测器，衍射光学聚光镜和共振压电斩波器，红外传感器实现了微型化，在许多领域中获得了广泛的应用。