医疗电子技术的现状及发展(下)

<正> 治疗仪器与设备 传统的治疗技术主要是靠药物和手术,现代医疗器械的发展使现代治疗技术出现了多元化的局面,利用各种物理因素的治疗仪器,在临床上发挥了越来越重要的作用。现代化治疗仪器按大的系列划分有放射治疗、微波治疗、射频治疗、超声治疗、激光治疗、毫米波治疗、红外治疗等仪器以及各种利用声、光、电、磁、机械力的小型理疗仪器和设备。 1.放射治疗仪器 放射治疗目前是除手术治疗之外的最主要癌疗手段。常     

基于模糊控制的热风炉燃烧控制系统

针对热风炉燃烧系统的复杂性、非线性、参数的不确定性和我国热风炉燃烧控制系统的现状,分析了拱顶温度、空燃比、煤气流量这三者的关系,开发了基于模糊控制的热风炉燃烧控制系统模型。仿真结果表明,该系统确实比传统控制系统使燃烧过程更加稳定,提高了热交换效率。     

智能电针治疗仪原理与实现

电针是传统毫针与电刺激结合用于临床的一种针刺疗法。基于电针补泻针法的实现方法设计的智能电针仪器系统,对于促进传统针灸器具的进步具有重要意义,该治疗仪器对多种疾病具有良好的治疗效果。     

基于NI VISA的仪器驱动设计

虚拟仪器,就是在通用计算机平台上,用户根据自己的需求定义和设计仪器的测试功能,其实质是将传统仪器硬件和最新计算机软件技术充分结合起来,以实现并扩展传统仪器的功能。虚拟仪器把计算机带到了仪器领域,使其在数据采集、仪器控制、过程监控和自动测试等多个方面发挥了极大的作用。与传统仪器相比,虚拟仪器在智能化程度、处理能力、性能价格比、可操作性等方面均具有明显的技术优势。     

治疗激光器在体育运动损伤中的应用

<正>在医学技术水平不断发展的今天,医疗卫生、康复疗养、美容养生等领域逐渐受到更多的关注。治疗激光器作为一种新型的医学治疗仪器在运动康复领域当中的应用呈现出新的发展趋势,治疗激光器在我国康复领域市场中的应用为整个运动损伤治疗工作带来了新的进展。和其他具有相同治疗作用的仪器相比较,治疗激光器对运动损伤的治疗效果具有显著的提升作用,同时其治疗时间相对较短,治疗效率也要高于其他仪器。     

人体信息诊疗仪的研制

以中医理论为基础,结合现代激光技术、计算机技术,利用人体信息来诊断和治疗疾病.该仪器由两部分即半导体激光针灸部分和电脑专家数据库组成.仪器不仅克服了传统针灸方法的弊端,而且包含有可自动诊断的专家数据库.     

锅炉分层燃烧技术的燃烧特性及节能分析

介绍了分层燃烧技术的原理及燃烧特性,对比分析了传统链条锅炉存在的问题及应用分层燃烧技术后的应用效果。     

利用傅里叶变换红外光谱仪测量固体推进剂的燃烧温度

利用布鲁克公司生产的OPAG 33型傅里叶变换红外光谱仪(Fourier Transform Infrared Spectrometer, FTIR)对固体推进剂燃烧火焰的温度进行了研究。在仪器的分辨率为4 cm-1、测试距离为20 m的条件下,实时测得了高能硝酸酯增塑聚醚(Nitrate Ester Plasticized Polyether Propellant, NEPE)固体推进剂燃烧火焰的红外发射光谱图。利用燃烧产物中HCl气体分子的发射光谱精细结构谱线计算了NEPE固体推进剂羽流的温度。实验结果表明,利用被动式遥感FTIR光谱仪可对固体推进剂的燃烧温度进行快速实时的非接触式测量,是一种有效的研究手段。     

虚拟仪器和传统仪器的比较

阐述了虚拟仪器技术和传统仪器之间的兼容性和区别。 虚拟仪器与传统仪器的区别 虚拟仪器由用户定义,而传统仪器则功能固定且由厂商定义。传统仪器和基于软件的虚拟仪器具有许多相同的结构组件,但是在体系结构原理上完全不同,如图1所示。     

虚拟仪器技术在机械电子工程专业实验教学中的应用

"软件及仪器"是虚拟仪器区别于传统仪器的显著特点,它具有性能高、扩展性强、开发周期短、无缝集成等优点,被广泛应用于各种测试场合,已成为现代测试技术的发展趋势。虚拟仪器技术对机械电子工程专业教学及实验有着传统仪器无法比拟的优势。一、虚拟仪器技术(一)虚拟仪器简介20世纪80年代末美国国家仪器公司NI提出的虚拟仪器概念,引发了传统仪器领域的一场重大变革,使得计算机和网络技术得以长驱直     

Resolution Enhancement Technology:Integrated Process Solutions using OPC

DUV lithography, using the 248 nm wavelength, is a viable manufacturing option for devices with features at 130 nm and less. Given the low kl value of the lithography, integrated process development is a necessary method for achieving acceptable process latitude. The application of assist features for rule based OPC requires the simultaneous optimization of the mask, illumination optics and the resist.Described in this paper are the details involved in optimizing each of these aspects for line and space imaging.A reference pitch is first chosen to determine how the optics will be set. The ideal sigma setting is determined by a simple geometrically derived expression. The inner and outer machine settings are determined, in turn,with the simulation of a figure of merit. The maximum value of the response surface of this FOM occurs at the optimal sigma settings. Experimental confirmation of this is shown in the paper.Assist features are used to modify the aerial image of the more isolated images on the mask. The effect that the diffraction of the scattering bars (SBs) has on the image intensity distribution is explained. Rules for determining the size and placement of SBs are also given.Resist is optimized for use with off-axis illumination and assist features. A general explanation of the material' s effect is discussed along with the affect on the through-pitch bias. The paper culminates with the showing of the lithographic results from the fully optimized system.     

Cost-effective test solutions for smart card and other integrated flash applications

From its emergence in the late 1980s as a lower cost alternative to early EEPROM technologies, flash memory has evolved to higher densities and speedsand rapidly growing acceptance in mobile applications.In the process, flash memory devices have placed increased test requirements on manufacturers. Today, as flash device test grows in importance in China, manufacturers face growing pressure for reduced cost-oftest, increased throughput and greater return on investment for test equipment. At the same time, the move to integrated flash packages for contactless smart card applications adds a significant further challenge to manufacturers seeking rapid, low-cost test.     

Theoretical analysis of the relationship between the Brillouin gain coefficient and the strain in the optical-fiber sensors

The relation between the power of the Brillouin signal and the strain is one of the bases of the distributed fiber sensors of temperature and strain. The coefficient of the Bfillouin gain can be changed by the temperature and the strain that will affect the power of the Brillouin scattering. The relation between the change of the Brillouin gain coefficient and the strain is thought to be linear by many researchers. However, it is not always linear based on the theoretical analysis and numerical simulation. Therefore, errors will be caused if the relation between the change of the Brillouin gain coefficient and the strain is regarded as to be linear approximately for measuring the temperature and the strain. For this reason, the influence of the parameters on the Brillouin gain coefficient is proposed through theoretical analysis and numerical simulation.     

An improved parallel thinning algorithm with two subiterations

The parallel thinning algorithm with two subiterations is improved in this paper. By analyzing the notions of connected components and passes, a conclusion is drawn that the number of passes and the number of eight-connected components are equal. Then the expression of the number of eight-connected components is obtained which replaces the old one in the algorithm. And a reserving condition is proposed by experiments, which alleviates the excess deletion where a diagonal line and a beeline intersect. The experimental results demonstrate that the thinned curve is almost located in the middle of the original curve connectivelv with single pixel width and the processing speed is high.     

Novel fiber-optical interferometer with miniaturized probe for in-hole measurements

Today, micro-system technology and the development of new MEMS （Micro-Electro-Mechanical Systems） are emerging rapidly. In order for this development to become a success in the long run, measurement systems have to ensure product quality. Most often, MEMS have to be tested by means of functionality or destructive tests. One reason for this is that there are no suitable systems or sensing probes available which can be used for the measurement of quasi inaccessible features like small holes or cavities. We present a measurement system that could be used for these kinds of measurements. The system combines a fiber optical, miniaturized sensing probe with low-coherence interferometry, so that absolute distance measurements with nanometer accuracy are possible.     

Development of the readout system for waveguide multilayer optical card

Waveguide multilayer optical card （WMOC） is a novel storage device of three-dimensional optical information. An advanced readout system fitting for the WMOC is introduced in this paper. The hardware mainly consists of the light source for reading, WMOC, motorized stages addressing unit, microscope imaging unit, CCD detecting unit and PC controlling ＆ processing unit. The movement of the precision motorized stage is controlled by the computer through Visual Basic （VB） language in software. A control panel is also designed to get the layer address and the page address through which the position of the motorized stages can be changed. The WMOC readout system is easy to manage and the readout result is directly displayed on computer monitor.     

Study of waveguide coupling efficiency in hybrid silicon lasers

This paper presents a new method to increase the waveguide coupling efficiency in hybrid silicon lasers. We find that the propagation constant of the InGaAsP emitting layer can be equal to that of the Si resonant layer through improving the design size of the InP waveguide. The coupling power achieves 42% of the total power in the hybrid lasers when the thickness of the bonding layer is 100 nm. Our result is very close to 50% of the total power reported by Intel when the thickness of the thin bonding layer is less than 5 nm. Therefore, our invariable coupling power technique is simpler than Intel＇s.     

Collinear phase-matching study of terahertz-wave generation via difference frequency mixed in GaAs and Inp

The collinearly phase-matching condition of terahertz-wave generation via difference frequency mixed in GaAs and InP is theoretically studied. In collinear phase-matching, the optimum phase-matching wave hands of these two crystals are calculated. The optimum phase-matching wave bands in GaAs and lnP are 0.95-1.38μm and 0.7-0.96μm respectively. The influence of the wavelength choice of the pump wave on the coherent length in THz-wave tuning is also discussed. The influence of the temperature alteration on the phase-matching and the temperature tuning properties in GaAs crystal are calculated and analyzed. It can serve for the following experiments as a theoretical evidence and a reference as well.     

Effects of the alloy compositions on the phonon-polaritons in ternary mixed crystals

Composition dependence of bulk and surface phonon-polaritons in ternary mixed crystals are studied in the framework of the modified random-element-isodisplacement model and the Bom-Huang approximation. The numerical results for Several Ⅱ - Ⅵ and Ⅲ- Ⅴ compound systems are performed, and the polariton frequencies as functions of the compositions for ternary mixed crystals AlxGa1-xAs, GaPxAS1-x, ZnSxSe1-x, GaAsxSb1-x, GaxIn1-xP, and ZnxCd1-xS as examples are given and discussed. The results show that the dependence of the energies of two branches of bulk phonon-polaritons which have phonon-like characteristics, and surface phonon-polaritons on the compositions of ternary mixed crystals are nonlinear and different from those of the corresponding binary systems.     

New insert layer structure OLEDs

An insert layer structure organic electroluminescent device（OLED） based on a new luminescent material （Zn（salen）） is fabricated. The configuration of the device is ITO/CuPc/NPD/Zn（salen）/Liq/LiF/A1/CuPc/NPD/Zn（salen）/Liq/LiF/A1. Effective insert electrode layers comprising LiF（1nm）/Al（5 nm） are used as a single semitransparent mirror, and bilayer cathode LiF（1 nm）/A1（100 nm） is used as a reflecting mirror. The two mirrors form a Fabry-Perot microcavity and two emissive units. The maximum brightness and luminous efficiency reach 674 cd/m^2 and 2.652 cd/A, respectively, which are 2.1 and 3.7 times higher than the conventional device, respectively. The superior brightness and luminous efficiency over conventional single-unit devices are attributed to microcavity effect.