微透镜列阵与红外探测器列阵集成芯片的研究

在分析微透镜列阵光聚能原理的基础上,针对背照式256290铂硅红外焦平面探测器列阵 的结构参数,设计了衍射微透镜列阵,使入射光通过硅基底聚焦至探测器的各个光敏面上, 提高光能利用率从而增强探测能力。实验获得了微透镜列阵与红外焦平面集成芯片,并在热成像中取得了良好的结果。     

Microelectrodes on a Silicon Chip for Label-Free Capacitive DNA Sensing

This paper presents the experimental characterization of two-terminal microfabricated capacitors for microarrays with an electrical sensing of label-free deoxyribonucleic acid (DNA). So far, such a concept has been demonstrated only in experimental setups featuring dimensions much larger than those typical of microfabrication. Therefore, this paper investigates: 1) the compatibility of the silicon microelectronic processes with biological functionalization procedures; 2) the effects of parasitics when electrodes have realistic dimensions; 3) measurement stability and reproducibility; and 4) the possibility of a fully integrated stand-alone device. The obtained results clearly indicate that two-terminal capacitive sensing with fully integrated electronics represents a viable technology for a DNA label-free detection/recognition.     

On-Chip Capacitance Sensing for Cell Monitoring Applications

We describe an integrated circuit for sensing the substrate coupling capacitance of anchorage-dependent living cells in a standard culture environment. Capacitance is measured using charge redistribution in response to weak, low frequency electric field excitations. The underlying biophysical phenomenon results primarily from the insulating nature of the cell structure and the counterionic polarization in the surrounding aqueous medium. The measured capacitance depends on a variety of factors related to the cell, its growth environment and the supporting substrate. These include membrane integrity, morphology, extracellular ionic concentration, adhesion strength, and substrate proximity. The measured capacitance is an indication of both the interaction between cells and substrate and cell health. The capacitance sensor uses the principle of charge sharing and translates sensed capacitance values to output voltages. The sensor chip has been fabricated in a commercially available 0.5-mum, 2-poly 3-metal CMOS technology. The sensing technique does not require direct electrical connection to the aqueous culture medium. We report results from experiments demonstrating on-chip tracking of cell adhesion as well as long term monitoring of cell viability in vitro     

微透镜阵列对Hartmann—Shack波前探测器探测精度的影响

微透镜阵列是Ｈａｒｔｍａｎｎ－Ｓｈａｃｋ波前探测器的核心元件之一。本文从理论上分析了微透镜阵列的性能对Ｈａｒｔｍａｎｎ－Ｓｈａｃｋ波前探测器的波前探测精度的影响，并根据理论分析进行了一系列实验，得到了有益的结果。     

变风量空调系统的控制及应用

讨论了变风量空调系统(VAV)的概念、发展及其优点,变风量系统的几种控制方法,新风量的控制,末端装置的选择和变风量系统适用范围等问题,其中重点讨论了新风量的控制方法.     

两类可变数据印刷应用方案的实践

目的研究和比较常规印前处理软件和专业级软件这2种可变数据印刷应用方案,总结得出2种方案在可变数据印刷作业的设计方法和输出效率方面的差异。方法分别以Adobe Photo Shop,In Design和Altas Print Shop为工具,通过"图书借阅证"案例,对比普通印前处理软件和专业级可变数据印刷软件在可变数据印刷设计方面的功能特点。通过分析Print Shop软件导出的PPML格式的可变数据打印文件,研究可变数据印刷系统的工作原理。结论相比常规印前处理软件,专业级可变数据印刷软件不仅能够能完成可变数据作业的设计和制作,还能输出专用的可变数据文件格式,这些专用格式能够准确描述打印机光栅化处理器(RIP)可识别的页面静态信息和可变信息,使得静态内容和动态内容能够单独RIP,提高印前作业的处理效率。     

A Linear Variable Differential Capacitive Transducer for Sensing Planar Angles

A linear variable differential capacitive transducer for the measurement of planar angles (from 0deg to 360deg) is presented in this paper. The sensor part of the transducer is made of parallel plates of standard and easy-to-fabricate shapes, and the signal-conditioning electronics are realized, employing a couple of simple relaxation oscillators. The output of the transducer is only dictated by a pair of dc reference voltages, and hence, high accuracy and linearity over the entire range (from 0deg to 360deg) are easily obtained by the use of precision dc reference voltages. Detailed analysis indicates that the sensitivity of the transducer is minimal for variations in different parameters. Experimental results obtained on a prototype transducer that has been built and tested establish the efficacy of the proposed transducer. The worst-case error of the prototype transducer is found to be less than 0.1%.     

用于短波红外探测器的微透镜阵列制作

采用光刻胶热熔法制作具有特定尺寸的微透镜,制作的微透镜能将微透镜阵列技术应用于短波1 μm ~3 μm红外探测器中,有效地提高探测器件的光电性能。采用AZ P4620厚光刻胶,利用紫外光刻技术,对透镜制作中的前烘、曝光和显影、坚膜、热熔等工艺进行了深入细致的实验研究,确定了最优的工艺参数,实现了球冠直径在(5.5±0.5) μm,曲率半径3 μm的微透镜,且透镜有很好的均匀性和一致性,满足近红外探测器件的要求。     

Microlens arrays for integral imaging system

When designing a system capable of capturing and displaying 3D moving images in real time by the integral imaging (II) method, one challenge is to eliminate pseudoscopic images. To overcome this problem, we propose a simple system with an array of three convex lenses. First, the lateral magnification of the elemental optics and the expansion of an elemental image is described by geometrical optics, confirming that the elemental optics satisfies the conditions under which pseudoscopic images can be avoided. In using the II method, adjacent elemental images must not overlap, a condition also satisfied by the proposed optical system. Next, an experiment carried out to acquire and display 3D images is described. The real-time system we have constructed comprises an elemental optics array with 54 H x 59 V elements, a CCD camera to capture a group of elemental images created by the lens array, and a liquid crystal panel to display these images. The results of the experiment confirm that the system produces orthoscopic images in real time, and thus is effective for real-time application of the II method.     

微透镜列阵成像光刻调焦方法

本文分析了离焦量对微透镜列阵成像光刻图形质量的影响,给出了系统离焦量的容差.同时提出了一种结构简单、可应用于微透镜列阵成像光刻系统调焦的新方法.并将基于该调焦方法的实验装置应用于微透镜列阵成像光刻系统,进行了光刻实验.实验表明,利用该方法时微透镜列阵成像光刻系统调焦,可得到接近微透镜列阵极限像质的光刻图形.     

片钽全自动外观检测系统的设计与应用

本文介绍了一种外观检测系统的构成设计及应用实例，它非常适合于元器件连续生产过程中，产品的外观检测及处理，具有高速，高效的特点。     

Synthesis of Ru-Ni Core-Shell Nanoparticles for Potential Sensor Applications

Nanoparticles of Ru-Ni with a core-and-shell structure were synthesized as potential sensors in a single-step spray-pyrolysis process at 700-1000. The majority of the core consists of ruthenium, while the shell is predominately composed of nickel. An aqueous precursor containing ruthenium chloride and nickel chloride was nebulized by an ultrasonic atomizer to generate an aerosol. The aerosol droplets were subsequently decomposed to form uniformly distributed Ru-Ni bimetallic nanoparticles. Atomic fractions of precursors, solvent type and process temperature play crucial roles in the formation of core-and-shell structures.     

纳米结构热电材料及其在温差电池上的应用

热电材料微观组织结构的纳米化有利于增强对声子的散射,降低材料热导率,从而提高热电材料的性能.采用水热合成方法制备了包含纳米管、纳米线等形态的Bi2Te3基纳米结构粉末.采用真空热压方法制备了含纳米结构粉末的Bi2Te3基纳米复合热电材料.实验结果表明,纳米复合热电材料具有高电导、低热导的优良性能特征.最大无量纲热电优值达到1.3左右,比同类区熔材料提高15%左右.模拟计算表明,用纳米复合材料制备的温差电池的单位面积最大输出功率为1100W·m-2,热电转换效率在8%以上,在余热发电应用领域具有实际应用经济价值.     

CVD Grown Tungsten Oxide for Low Temperature Hydrogen Sensing: Tuning Surface Characteristics via Materials Processing for Sensing Applications

The intrinsic properties of semiconducting oxides having nanostructured morphology are highly appealing for gas sensing. In this study, the fabrication of nanostructured WO₃ thin films with promising surface characteristics for hydrogen (H₂) gas sensing applications is accomplished. This is enabled by developing a chemical vapor deposition (CVD) process employing a new and volatile tungsten precursor bis(diisopropylamido)-bis(tert-butylimido)-tungsten(VI), [W(N^tBu)₂(NⁱPr₂)₂]. The as-grown nanostructured WO₃ layers are thoroughly analyzed. Particular attention is paid to stoichiometry, surface characteristics, and morphology, all of which strongly influence the gas-sensing potential of WO₃. Synchrotron-based ultraviolet photoelectron spectroscopy (UPS), X-ray photoelectron spectroscopy (XPS), X-ray photoelectron emission microscopy (XPEEM), low-energy electron microscopy (LEEM) and 4-point van der Pauw (vdP) technique made it possible to analyze the surface chemistry and structural uniformity with a spatially resolved insight into the chemical, electronic and electrical properties. The WO₃ layer is employed as a hydrogen (H₂) sensor within interdigitated mini-mobile sensor architecture capable of working using a standard computer's 5 V 1-wirebus connection. The sensor shows remarkable sensitivity toward H₂. The high, robust, and repeatable sensor response (S) is attributed to the homogenous distribution of the W⁵⁺ oxidation state and associated oxygen vacancies, as shown by synchrotron-based UPS, XPS, and XPEEM analysis.     

Potential Military Applications of Two-Phase Sampling

Two-phase sampling is a relatively unknown technique which, in military applications, could save money in several areas of measurement. By first classifying the population through the use of an inexpensive method one reduces the number of expensive measurements which would be required if traditional one-phase sampling were used. Two-phase sampling achieves this by better utilizing information gained by classification than does traditional stratified sampling.     

Direct Writing of Polycaprolactone Polymer for Potential Biomedical Engineering Applications

Topography, which in this paper includes the surface features and the features themselves, is a crucial physical cue for cells, influencing cell adhesion, proliferation and differentiation and should be considered when designing biomedical architectures. A new technique using electrohydrodynamic (EH) print‐patterning is described that generates ordered topographies using proven biomaterials and composites. Coupling this method with solvent evaporation techniques, desirable scaffold properties can be achieved. To demonstrate this, various solutions of polycaprolactone (PCL) and its composites (using nano‐hydroxyapatite (nHA)) have been selected to generate topographic and 3D structures. Electrically driven patterning of the polymer is achievable and can be used to deposit fine (<5 µm) ordered structures, according to a predetermined architecture via a computer with control on porosity and bioactivity. The results from this study indicate that this method to deposit bioactive structures with morphology control will offer great potential in biomedical engineering.     

Black Phosphorus (BP) Nanodots for Potential Biomedical Applications

Recently, the appeal of 2D black phosphorus (BP) has been rising due to its unique optical and electronic properties with a tunable band gap (≈0.3–1.5 eV). While numerous research efforts have recently been devoted to nano‐ and optoelectronic applications of BP, no attention has been paid to promising medical applications. In this article, the preparation of BP‐nanodots of a few nm to <20 nm with an average diameter of ≈10 nm and height of ≈8.7 nm is reported by a modified ultrasonication‐assisted solution method. Stable formation of nontoxic phosphates and phosphonates from BP crystals with exposure in water or air is observed. As for the BP‐nanodot crystals’ stability (ionization and persistence of fluorescent intensity) in aqueous solution, after 10 d, ≈80% at 1.5 mg mL^?1 are degraded (i.e., ionized) in phosphate buffered saline. They showed no or little cytotoxic cell‐viability effects in vitro involving blue‐ and green‐fluorescence cell imaging. Thus, BP‐nanodots can be considered a promising agent for drug delivery or cellular tracking systems.     

衍射微透镜列阵质量评价方法研究

根据实际工程需要 ,对用于萨克 -哈特曼波前传感器的二元衍射微透镜列阵衍射效率的评价方法进行了研究。导出了制作误差与衍射效率的关系式 ,研究了由测得的制作误差评估衍射效率的方法 ,并建立了一套测量系统。