补偿强反光体表面红外测温误差的算法研究

针对运动强反光体表面温度实时测量困难、精度低这一难点,本文从红外测温原理入手,分析并揭示了红外测温精度易受到被测物体反射率、测量距离、测量环境、红外入射角等因素的影响。根据铝板材加工设备轧辊表面测温实际需要设计了一种利用红外传感器实现对强反光体表面温度点对点测量的方案。通过对测量数据的研究分析建立了一种基于斯忒藩定律的红外入射角度补偿算法,以此减小因红外入射角度变化产生的测温误差。实验结果证明本方法能较好地弥补红外入射角度变化产生的测温误差,提高测温精度。该补偿算法运算简单,适应性强,为改善入射角度变化对测温精度影响提供了新的方法。     

小型自动化立体库的应用

主要针对物流设备中的小型自动化立体库的类型、应用及发展过程进行了介绍 ,并且对不同形式的回转与升降式小型自动化立体库的功能 ,与输送机、AGV的配合以及相关的使用场所进行了说明。在现代社会中 ,小型自动化立体库的使用将越来越广泛 ,特别是随着生产自动化物流在社会发展水平的不断提高 ,物流在社会发展中的应用更为广泛 ,小型自动化立体库将在社会的各个行业中具有强大的发展潜力。     

加气混凝土小型空心砌块施工质量控制

混凝土小型空心砌块广泛应用于各种建筑的外围护结构，由于砌块具有自身的特性，砌体容易产生开裂等质量问题。从墙体抹灰层裂缝的类型着手分析裂缝产生的原因，从砌块材料的选择、施工排块设计、砌筑施工、裂缝预防的各环节所采取的具体措施进行分析，并提出控制砌块墙体裂缝的措施。     

反射式平行光管的红外瞄具零位走动量测量方法研究

介绍了一种同时用于红外瞄具零位走动量和装表量测量的光学测量方法,采用抛物面反射镜作为主镜的反射式平行光管模拟无限远目标,实现了平面反射镜和精密二维转台进行光线转向及自动读数。阐述了方法测量原理,并分析了瞄具零位走动量测量误差。验证实验结果表明,该方法可实现±10°的大视场范围测量和0.05mil的测角精度,保证高精度测量的同时,很好的解决了反射式平行光管由于视场小而导致测量范围受限的问题。     

基于InP/空气隙分布布拉格反射镜的微机械可调谐光滤波器

采用表面微机械技术制作了一种1 310 nm基于InP/空气隙分布布拉格反射镜的微机械可调谐Fabry-Perot光滤波器.该滤波器的通光孔直径约为70 μm,在1.4 V的调谐电压下,调谐范围达到15 nm.并采用光学传输矩阵方法,分析了斜入射对这种可调谐光滤波器透射谱的峰值半高宽的影响.     

InSAR中角反射器的识别策略研究

根据人工角反射器高反射率、强稳定性的特点,提出由粗到精的识别策略,基于预处理实现角反射器的粗识别,通过目视解译优化角反射器的位置,利用其时空特点开展统计分析提取出精确的位置。并利用Cosmo数据为例对识别策略进行了实验研究,有效地识别角反射器的精确位置信息,从而验证了本文角反射器识别策略的有效性。     

RECOVERING THE WIRING OF ENIGMA'S UMKEHRWALZE A

Umkehrwalze A was the original reflector used in the version of the Enigma machine employed by the German armed services. Its wiring was originally deduced by the Polish cryptanalyst Marian Rejewski in December 1932 or January 1933, but details of the wiring have not previously been published. Sufficient information to recover the wiring analytically is provided in a wartime document by Alan Turing, and other sources have been found to confirm the solution. This paper presents the wiring, along with alternative methods of recovering it from Turing's data.     

Impact of heliostat curvature on optical performance of Linear Fresnel solar concentrators

The present paper gives a numerical investigation of the effect of mirror curvature on optical performance of a Linear Fresnel Reflector solar field installed recently in Morocco. The objective is to highlight and discuss the effect of mirror curvature on the flux density distribution over the receiver and the system optical efficiency. For this purpose, a Monte Carlo-ray tracing simulation tool is developed and used to optimize the optical design taking into account the curvature degree of the heliostat field. In order to assess the accuracy of the numerical code developed and the validity of simulation results, a set of verification tests were developed and detailed within this article. Then, the optical performance of the system is evaluated as a function of mirror curvature and receiver height. The major challenge of this study is to find a trade-off between heliostat curvature and receiver height since lower and smaller receivers may reduce the system cost. It has been found that the flux distribution over the receiver and the optical efficiency of the system are relatively sensitive to the mirror curvature. We have demonstrated quantitatively how the use of curved mirrors can enhance the optical performance and reduce the required receiver size.     

Design,modeling, and optimization of a dual reflector parabolic trough concentration system

The aim of the present work is to enhance the thermal management avoiding the high-thermal stress on the outer surface of the parabolic trough receiver (PTR) derived from nonuniform concentrated solar flux distribution. A parabolic trough concentrating (PTC) system with second homogenizing reflector (HR) is numerically designed and optimized to ensure a uniform concentrated solar flux on the PTR walls. For this purpose, a three-dimensional optical model has been developed to analyze quantitatively the improvement made by the HR using the optical efficiency and qualitatively basing on the uniformity of the solar flux density distribution over the entire surface of the PTR. The validation of the numerical tool is presented, and the algorithm of the design process has been proposed and detailed. As a preliminary trait, it was revealed that the peak of the designed system performance is achieved with a rim angle of 68° avoiding simultaneously the aberration and the blocking effects. Despite the optical efficiency decrease by about 7% compared with the conventional PTC design, the uniformity of the solar flux distribution has been strongly improved such that the maximum local solar flux density gradient is decreased from 80 to 11 kW/m² equivalent to a decrease of 86.25% with respect to the conventional PTC and the average local density is about 25.5 kW/m².     

某雷达天线反射器的轻量化研制

本项目采用化学蚀刻法制作副反射器栅面图形替代原来的绷丝工艺;用高强度聚氨酯泡沫、J-164填充胶、低密度纤维粉等材料制作天线反射器法兰和加强筋部分;采用一体化成型法兰的方法既节约了两套法兰模具、缩短了天线制作周期,又减轻了天线的重量,采用合理的后处理工艺使天线反射器的型面精度达到图纸要求。