广钢转炉炼钢厂连铸坯质量研究

本文介绍了转炉炼钢厂通过采取有效措施，减少退废、脱方及横向裂纹废品，提高连铸坯质量。     

软质光学晶体菱形棱镜的加工与检验

应用在激光、红外和X光系统中的光学晶体零件,一般都要比光学玻璃零件的制造工艺复杂.本文所介绍的软质光学晶体菱形棱镜,要求精度高,加工难度大.文章以铌酸锂菱形棱镜为例,对软质光学晶体菱形棱镜的加工工艺以及测量方法进行了分析和探讨.     

激光双程放大菲涅耳棱体隔离器级间耦合研究

采用菲涅耳棱体隔离器(FROI)作为铷玻璃激光双程放大器级间的耦合,本文报导了对双程放大FROI的隔离比及其随光束口径的变化情况,并分析了调整精度对隔离比的影响。     

非晶态合金菱面体单元结构模型理论及应用

综述了非晶态合金菱面体单元结构模型在理论及应用方面的最新进展,包括菱面体单元结构模型与其它几咱非晶模型的比较;利用菱面体模型建立的非晶合金结构－成分－性能之间的对应关系,非晶合金储氢量的计算等。     

一种基于虚拟菱形网格的传感器节点布置算法

传感器的布置方式有两种,即确定性的和自组织的。通过分析两种布置方式,提出了一个基于虚拟菱形网格的传感器节点布置算法。该算法把两种布置方式综合在一个统一的平台内,能够形成一个最小连通支配集;保证传感器区域内无“盲区”;对不同的应用,可设置不同的感知或连通覆盖度。该算法在性能和效率上优于基于虚拟力的移动传感器布置算法,其灵活性使网络具有更广泛的适应性。     

Rotatable broadband retarders for far-infrared spectroscopic ellipsometry

Rotatable retarders have been developed for applications in spectroscopic, full Mueller Matrix ellipsometry in the far-IR spectral range. Several materials, such as silicon, KRS-5, and a commercial polymer plastic (TOPAS) have been utilized to achieve a fully adjustable retardation between 0° and 90°. Experimental characteristics of the rotatable retarders that utilize three- and four-bounce designs are compared with calculations. We discuss the effect of light focusing on the performance of these rotatable retarders.     

一种新结构的菱体型消色差λ/4延迟器

概括介绍了各种四分之一波片的基本原理。推出了一种新型的菱体λ／４延迟器,它是消色差器ＡＤ－２的改进型,具有更加优良的性能。椭偏术对其相延测量的实验结果,验证了这种波片结构设计的合理性。     

Dedicated spectrometers based on diffractive optics: Design,modelling and evaluation

Abstract

The described design of diffractive optical elements for low cost IR-spectrometers gives a built-in wavelength reference and allows ‘spectral arithmetic’ to be implemented in the optical performance of the DOE. The diffractive element combines the function of the lenses and the grating and eliminates the need for alignment of those components in the standard scanned grating spectrometer design. The element gives out a set of foci, each with one spectral component, which are scanned across a detector, thus relaxing the demands for scan angle control. It can thus be regarded as an alternative solution to a beam splitter and band pass filter instrument. Software tools have been designed to ease the adaptation of the design to different applications. To model the performance of the spectrometers we have implemented a scalar Rayleigh-Sommerfeldt diffraction model. The gold-coated elements are produced by injection moulding using a compact disc (CD) moulding technique and mould inlays mastered by e-beam lithography. The optimized selection of wavelength bands and the classification of the measured signal use a combination of principal component analysis and robust statistical methods. Typical applications will be material characterization of recycled plastics and gas monitoring. Spectrometers for two different applications have been built and tested. Comparisons between the design goals and the measured performance have been made and show good agreements.     

Characteristics of lateral-shearing nulling interferometry by use of double Fresnel rhombs

Abstract

Nulling interferometer for directly imaging exoplanets with a segmented-mirror telescope is investigated. Lateral shearing interferometry is applied to a segmented-mirror telescope such as the Thirty Meter Telescope. Use of a pair of double Fresnel rhombs in Mach–Zehnder interferometer achieves achromatic nulling and lateral shearing simultaneously. In this paper, computer simulations of the lateral interferometry with the Fresnel rhombs in the near infrared region are carried out to analyze the effects of segmentation errors, tip-tilt errors, amplitude and optical-path difference errors on its nulling performance.