Non-contact methods of measuring moisture concentration in external layers of building partitions II—Monitoring of the water vapour condensation on porous surfaces

This paper present the results of the investigation into a potential application of laser radiation for the detection of phase transition processes occurring on the surface layers of porous materials. An attempt was made to discuss in the approximation equations, the relationships between coefficients of the reflected light, the temperature and humidity of the surrounding environment. Laser light reflected from the porous surface carries information about the roughness of the structure. The presence of water microdrop on the surface of the porous material, as a result of condensation and thus a phase transition, leads to the phase displacement of individual rays, which is represented by different images. Therefore, a comprehensive analysis of the reflected light parameters allows a dynamic study of the phase transition phenomena without mechanical intervention.     

激光远距作用的机制与效应

本文定量分析激光远距作用的机理并对它们在治癌中的作用作简要的论述。     

10 Gb/ s 0. 18 􀀁m CMOS 激光二极管驱动器芯片

基于0．18μm CMOS工艺设计的10Gb／s激光二极管驱动器电路。核心单元为两级直接耦合的差分放大器，电路中采用了并联峰化技术和放大级直接耦合技术以扩展带宽，降低功耗。模拟结果表明，在1．8V电源电压作用下该电路可工作在10Gb／s速率上，输入单端峰峰值为0．3V的差分信号时，在单端50Ω负载上的输出电压摆幅可达到1．4V，电路功耗约为85mW。     

用于泵浦固体激光器的激光二极管线阵的输出特性

从实验上测量了激光二极管线阵的输出特性,研究了温度、电流对输出功率、光谱特性,以及偏振特性的影响,为设计全固态激光器提供有益的参考。     

红外半导体激光光镊的实验研究

激光光镊技术是一项在许多科学领域有广阔应用前景的技术。本文详细给出构建一台红外半导体激光光镊的设计思想及实例。由于采用了独特的对大功率多模红外激光选模整形和双透镜陷阱操纵技术等性能价格最优化选择 ,该系统易于构建 ,陷阱操作方便 ,其构建价格仅一般光镊的几十分之一 ,非常适合光镊技术的推广和一般实验室构建     

Thermal Generation of Residual Stress Fields for Purpose of Distortion Minimization

Thermal treatments of steel components with the goal of hardening often result in distortion by releasing the residual stresses which were brought into the specimen during the preceding processing steps. The goal of the presented work is the minimization of this distortion. By generating definite residual stress fields and investigating the resulting distortion, the distortion mechanism can be observed in detail. A flexible and reproducible way to generate such residual stress fields inside a specimen is by means of local thermal treatment with a laser beam. Computer simulations as well as experiments were carried out using an idealized tooth of a gearwheel (finger sample) as a model system. The deformation of the samples due to the laser heat treatment and the stress fields generated inside the samples were determined with respect to different process parameters.     

1等标准光滑圆柱环规检测装置

本装置是在具有高精度导轨的SIP三坐标测量机上架设激光干涉仪作为测量标准器，利用电感测微仪作为瞄准器，使测量可以直接溯源到激光波长，实现了1等标准光滑圆柱环规的高精度测量。装置对φ50mm标准环规直径测量的不确定度达到70．15μm。通过与瑞士国家计量局和国家计量院的比对测量证实，无论在国内还是国际环规测量方面，该装置已达到先进水平。     

直接探测测风激光雷达的性能分析

综述了激光雷达大气风场测量的方法，提出了采用直接探测到量三维风场分布的F-P干涉仪方法，简述了测量原理，分析了系统的性能和测量误差，比较了基于分子散射和气溶胶散射的系统测量精度，给出了基于瑞利散射的激光雷达系统方案。     

生物非光滑耐磨表面与非光滑耐磨技术在工程中的应用

指出生物非光滑耐磨表面现象的普遍性，对贝壳、牙齿等几种天然生物耐磨表面几何形态特征进行了分析，并介绍了加工耐磨表面的几种技术方法及非光滑耐磨技术在工程中的应用。同时，对非光滑耐磨理论与技术方法中存在的问题及发展趋势进行了分析与展望。     

光孤子源的研制

报道了利用增益开关分布反馈半导体激光器，Ｆ－Ｐ光学滤波器及掺饵光纤放大顺研制成光孤子源的研究工作。光孤子源性能稳定，输出的超短光脉冲重复频率为２．５ＧＨｚ脉宽２４，谱宽０．１４ｎｍ，时间带宽积０．４１９，平均输出光功率２．４ｍＷ。