超声反射法测厚仪的智能化设计

本文着重介绍了超声反射法测厚仪的工作原理、超声波探头的结构、超声反射法测厚仪的智能化设计,以及智能化改造超声波测厚仪所具备的先进性和实现的主要技术指标。     

Operational Properties of Ridge Waveguide Lasers with Laterally Tapered Waveguides for Monolithic Integration

We report on a ridge waveguide laser diode with laterally tapered waveguides fabricated in a single growing step using a double patterning method. In this structure, nearly constant output power is obtained with the change of the lower tapered waveguide width, and the facet power ratio of 1.4 to 1.5 is observed over the current range. The asymmetric facet power property is also investigated.     

试论单片机在温度测控方面的应用

温度测控在工业领域具有广泛的应用,随着传感器技术、微电子技术、单片机技术的不断发展,为智能温度测控系统测控功能的完善、测控精度的提高和抗干扰能力的增强等提供了条件.由于单片机具有集成度高、功能强、体积小、价格低、抗干扰能力等优于一般CPU的优点,因此,在要求较高的控制精度和较低成本的工业测控系统中,往往采用单片机作为数字控制器取代模拟控制器.本文将介绍一种基于AT89C52和AT89C2051双MCU的注塑成型温度测控系统,及其硬、软件的设计方法和系统的原理框图等.     

基于单片机的双电源切换装置的设计与实现

针对不间断供电的广泛需求，基于对电压采样、检测和比较的工作原理，利用单片机对电源状况进行检测和判断并进行相应的控制，实现了双电源供电的自动切换，从硬件结构、软件煽制和抗干扰措施三方面进行了较详细的讨论。     

有机-无机杂化反相硅胶整体柱的电色谱性能研究

采用溶胶-凝胶法,结合超分子模板技术制备新型有机-无机杂化反相硅胶整体柱,以苯的同系物对所制备的整体柱进行评价,考察溶质的板高与流动相线速之间的关系,获得最高210000塔板数/米的柱效,结果表明该整体柱具有典型的反相色谱性能,并具有较理想的分离重现性。     

Monolithic integration of Giant Magnetoresistance (GMR) devices onto standard processed CMOS dies

Giant Magnetoresistance (GMR) based technology is nowadays the preferred option for low magnetic fields sensing in disciplines such as biotechnology or microelectronics. Their compatibility with standard CMOS processes is currently investigated as a key point for the development of novel applications, requiring compact electronic readout. In this paper, such compatibility has been experimentally studied with two particular non-dedicated CMOS standards: 0.35 μm from AMS (Austria MicroSystems) and 2.5 μm from CNM (Centre Nacional de Microelectrònica, Barcelona) as representative examples. GMR test devices have been designed and fabricated onto processed chips from both technologies. In order to evaluate so obtained devices, an extended characterization has been carried out including DC magnetic measurements and noise analysis. Moreover, a 2D-FEM (Finite Element Method) model, including the dependence of the GMR device resistance with the magnetic field, has been also developed and simulated. Its potential use as electric current sensors at the integrated circuit level has also been demonstrated.