I2C总线控制器PCF8584的应用

本文介绍了I^2C串行总线控制器PCF8584的结构、功能。结合我们一个课题，给出了PCF8584在系统中的应用。     

国产化大模场掺镱光子晶体光纤的设计与制备

理论分析了空气孔尺寸与晶格常数对光子晶体光纤(PCF)单模特性的影响,设计了大模场双包层PCF的波导结构。采用自主知识产权的专利技术,制备出高数值孔径大模场掺Yb双包层PCF,其内包层数值孔径为0.65,纤芯数值孔径为0.06,有效模场面积为1 465.7μm2。     

Photonic crystal fiber Mach-Zehnder interferometer with microholes ablated by a femtosecond laser for refractive index sensing

A new structure of the photonic crystal fiber (PCF) based Mach-Zednder interferometer (MZI) is fabricated and presented. The structure has microholes ablated by a femtosecond laser. The fringe visibility can be enhanced more than 10.dB compared with the interferometer without a microhole. The interferometer is characterized by sodium chloride solutions for refractive index (RI) sensing. The RI sensitivities are greatly increased by the hole fabrication since it directly changes the cladding modes of the PCF. For the interferometer sensor with two holes, the RI sensitivity is 157.74 nm/RIU, which is 5.times than that of the sensor without a microhole. Microholes ablation with a femtosecond laser on PCF can increase the sensor''s sensitivity dramatically. Femtosecond laser has a wide application prospect in the field of performance improvement of the sensors.     

I2C总线在指纹识别系统键盘显示中的应用

针对大多数嵌入式系统键盘显示电路复杂、不灵活、维护困难等问题,结合指纹识别系统在汽车安全领域的应用,介绍了基于I2C总线的数码管显示驱动和键盘扫描控制芯片CH452S以及扩展口器件PCF8574AP在指纹识别系统键盘显示接口中的应用,包括硬件电路连接和软件程序设计.采用I2C总线,不仅占用端口资源少,电路结构简单,而且易于电路扩展与系统升级.     

Controlled chemical modification of the internal surface of photonic crystal fibers for application as biosensitive elements

Photonic crystal fibers (PCF) are one of the most promising materials for creation of constructive elements for bio-, drug and contaminant sensing based on unique optical properties of the PCF as effective nanosized optical signal collectors. In order to provide efficient and controllable binding of biomolecules, the internal surface of glass hollow core photonic crystal fibers (HC-PCF) has been chemically modified with silanol groups and functionalized with (3-aminopropyl) triethoxysilane (APTES). The shift of local maxima in the HC-PCF transmission spectrum has been selected as a signal for estimating the amount of silanol groups on the HC-PCF inner surface. The relationship between amount of silanol groups on the HC-PCF inner surface and efficiency of following APTES functionalization has been evaluated. Covalent binding of horseradish peroxidase (chosen as a model protein) on functionalized PCF inner surface has been performed successively, thus verifying the possibility of creating a biosensitive element.     

Probabilistic coherence spaces as a model of higher-order probabilistic computation

We study a probabilistic version of coherence spaces and show that these objects provide a model of linear logic. We build a model of the pure lambda-calculus in this setting and show how to interpret a probabilistic version of the functional language PCF. We give a probabilistic interpretation of the semantics of probabilistic PCF closed terms of ground type. Last we suggest a generalization of this approach, using Banach spaces.     

光子晶体与单模光纤熔接对超连续谱展宽的影响

针对光子晶体光纤之间直接熔接损耗较大的问题.文中采用纳秒激光器作为泵浦源,通过光子晶体光纤与单模光纤HI-1060低损耗熔接的方法,研究了超连续谱的展宽过程,分析了超连续谱的产生机理.实验结果表明：泵浦源在重复频率为150kHz、泵浦功率为2.2W时,利用20m的光子晶体光纤与1m的单模光纤的熔接实现了输出功率为0.48W、光谱范围超过1100nm的超连续谱输出.     

粉体致密化法(PCF)制备泡沫铁的研究

采用粉末致密化发泡(PCF)工艺制备泡沫铁,研究了各工艺参数对泡沫铁制备及其孔隙率的影响规律,得出了实验条件下的优化工艺参数配置,对制备过程及影响孔隙率的因素进行了分析,获得了泡沫铁的优化制备工艺及各工艺参数对孔隙率的影响规律,对泡沫铁的研究与开发具有显著意义.     

椭圆芯光子晶体保偏光纤的优化设计

通过调节椭圆芯光子晶体光纤（PCFs）孔直径和孔间隔，以甲基丙烯酸甲酯（MMA）作为基材，采用本体聚合的方法，研制出2种不同保偏（PM）程度的PCFs预制棒，并采用二次拉伸方法得到2种参数结构的样品，进而针对不同的样品进行PM性能和光学性质测试研究，实验给出椭圆芯PMPCFs最优化的设计参数。     

时钟芯片在电压监测仪校验装置中的应用

根据电压监测仪校验装置需要建立一个标准时钟,对电压监测统计仪进行时间精度校正的要求,介绍了I2C总线接口时钟芯片PCF8583的基本原理,提出了利用DS32KHz给PCF8583提供高稳定度频率信号,从而实现了标准时钟的方案,并给出了PCF8583与MCS51单片机接口设计。