分光计调节和使用中的困难及解决措施

阐述了分光计在调节和使用过程中出现的困难并分析其原因,提出了加装激光准直系统、广角系统以及标记游标等一系列解决困难的具体措施。     

自由曲面非接触测量技术的研究(英文)

提出了一种基于坐标测量机、测头回转体和激光三角法测头的非接触三维测量系统 ,并介绍了测量系统的工作原理 .同时给出了采用标准球对测量系统进行标定的方法 ,建立了测量系统的数学模型 ,还对白纸样板曲面进行了实际测量     

数字图像处理技术在建筑物准直领域的应用

随着数字图像处理技术的发展，它在工业测量领域得到了越来越多的应用。本文介绍了在建筑物准直测量过程中数字图像处理系统的基本结构，并对其处理系统作了简要的阐述，就其更精确的处理改进做了展望。     

用普通球透镜来做有胶/无胶准直器

本文介绍了光纤准直器的基本原理,制作工艺以及待解决的工艺问题,用普通的球透镜制作了光纤准直器,计算并测量了用普通的球透镜来做的光纤准直器的损耗,分析了损耗的原因并提出了改进办法.     

声控舞台激光灯的设计

本文介绍了单片机在舞台灯光的应用。利用激光的准直性、单色性、高亮度等特点,采用单片机和声音控制步进电机,控制激光的反射,从而得到合成的图案,而且图案能随着音乐的变换而改变,产生不同的灯光效果。     

J2经纬仪带90°弯管目镜天顶准直法测量

本文结合一高层建筑轴线竖向投测介绍内控法中的J2经纬仪带90度弯管目镜天顶准直法测量的方法。     

J2经纬仪带90°弯管目镜天顶准直法测量

本文结合一高层建筑轴线竖向投测介绍内控法中的Ｊ２经纬仪带９０°弯管目 镜天顶准直法测量的方法     

红外激光油位测量系统的研究

提出了一种利用红外激光进行油位测量的新方法及相应的实验室测量系统．重点介绍了系统的特点、组成及工作原理,并对系统的实际测量效果、存在的问题进行了简要的分析．     

基于中子照相的准直装置设计

阐述了中子照相的基本原理和装置构成,设计了相应的中子准直装置.通过改变准直器的厚度、准直孔的大小,测量准直孔和孔周围不同位置的中子分布.将实验得出的数据与理论值和模拟值相比较,从而确定该准直装置使用的可行性.     

增益开关激光脉冲时基抖动的测量方法

分析了增益开关激光脉冲抖动产生的原因及其分类.系统介绍了取样示波器法、相位噪声法、谐波分析法和互相关法等测量脉冲抖动的方法,并总结了它们的优缺点及适用范围.     

A laser shaft alignment system with dual PSDs

INTRODUCTION Precise alignment occurs when the centerlines of rotation of two shafts are essentially collinear with each other. The degree to which two machines are misaligned can be determined by examining the amount of offset and angularity that exists between them. Offset is the distance between the two rota- tional centerlines, and angularity is the angle between the centerlines created by the misalignment of the two centerlines. The traditional precise shaft alignment method is dial …     

基于改进的单次自相关测量飞秒激光脉冲的时空特性(英文)

针对单次自相关方法只能测量一个脉宽的缺点,提出一种改进的单次相关方法测量超短激光脉冲全空域中不同空间位置的时空特性.通过实验测量了钛宝石激光器输出飞秒激光脉冲的时空特性,结果表明飞秒激光脉冲全空域中不同位置的复杂空间特性得以精密测量;不同空间位置的时间脉宽不同,它们服从高斯分布;当飞秒激光脉冲经过二硫化碳非线性介质传输后,随着输入平均功率的增加,同一空间位置的时间脉宽呈现慢慢变窄的趋势.实验结果验证了所提方法可以有效地测量超短激光脉冲全空域中不同空间位置的时空特性.     

脉冲防暴水炮雾化特性实验方法分析

脉冲防暴水炮射流的非稳态特征和较大的雾场范围,增加了对其雾化特性进行测量的难度。通过分析当前激光雾场测量技术的基本原理和方法,指出粒子图像速度粒径(particle i mage veloci metry and sizing,PIVS)方法适合脉冲防暴水炮射流雾化特性的测量。根据脉冲防暴水炮的射流特点,提出了基于粒子散射、激光片光成像和高速摄影技术的测量方法,并对硬件系统的设计进行了分析,为下一步试验台的搭建提供了理论指导。     

发挥双频激光干涉仪功能开出高质量的实验

双频激光干涉仪是现代精密测量中最精密的测量仪器之一。文章介绍了双频激光干涉仪的实验内容和方法，以及在实验教学中激发学生兴趣和求知欲，提高学生综合能力的实践经验。     

激光频率分裂与模竞争实验系统构建

与工厂合作,为研究生专业课"现代光学实验"开发出独创的半外腔型激光频率分裂与模竞争教学实验系统,在同一谐振腔中得到频差较大而偏振态正交的2组激光纵模输出,借助扫描干涉仪和数字示波器可观测和记录2组纵模的频率分裂特性和模竞争现象。研究生通过该实验可深刻理解激光器工作原理和纵模形成机制,并研讨利用激光频率分裂特性进行几何量和物理量的测量方法。     

Flexible Calibration Method for 3D Laser Scanner System简

In this paper, a flexible high-precision calibration method suitable for industrial field was proposed. The complexity of the coordinate transformation was simplified by choosing the camera coordinate system as the unified reference coordinate system. A flexible planar calibration pattern was introduced to the calibration process, which can be arbitrarily placed and from which the known feature points can be extracted to construct other unknown feature points. With the known intrinsic parameters, the laser projector plane equation was fitted by the multi-noncollinear points, which were acquired through the principle of triangulation and the projective invariance of cross ratio. With this method, the strict alignment and multiple times of coordinate transformation can be avoided. Experimental results showed that the arithmetic mean of the root mean square （RMS） error of distance was 0.000 7 mm.     

The e-balanced scorecard (e-BSC) for measuring academic staff performance excellence

This research paper is a pilot study that investigated the suitability of adopting an automated balanced scorecard for managing and measuring the performance excellence of academic staffs in the higher education setting. A comprehensive study of related literature with requirements elicited from the target population in a selected premier university in Malaysia through document analysis, interviews and survey questionnaires provided the foundation for the system development. By adopting the balanced scorecard, the proposed system provided a means for top down alignment of organisational objectives while creating a medium of communication between the lecturers and management. Though the method suggested in this study primarily focuses on the academic staff, it addresses the lack of a representative form of performance measurement for lecturers that accommodates the complexities of the profession while providing the potential adoption of an unconventional method to encourage excellence and development amongst all levels of employees in the industry.     

Application of 2-D Position Sensitive Detector in Spatial Straightness Measurement of Guide Rails

A laser collimating system based on 2-D position sensitive detector (PSD) is presented in this paper. The working principle of PSD is depicted in detail. A calibration device was developed to check the nonlinearity errors of PSD and a multilayer feedforward neural network based on error back-propagation algorithm was used to compensate errors. With the aid of computer-based data acquisition system, an automatic dynamic measuring process was realized. A series of experiments, including comparison tests with laser interferometer, were done to evaluate the performance of the measuring system. The experimental results show that the spatial straightness errors of guide rails can be measured with high accuracy. The maximum differences between the device and laser interferometer are 0. 027 mm in Y direction, and 0. 053 mm in X direction in the measuring distance of 6 m.     

How Item Writers Understand Depth of Knowledge

An important part of test development is ensuring alignment between test forms and content standards. One common way of measuring alignment is the Webb (1997, 2007) alignment procedure. This article investigates (a) how well item writers understand components of the definition of Depth of Knowledge (DOK) from the Webb alignment procedure and (b) how consistent their DOK ratings are with ratings provided by other committees of educators across grade levels, content areas, and alternate assessment levels in a Midwestern state alternate assessment system. Results indicate that many item writers understand key features of DOK. However, some item writers struggled to articulate what DOK means and had some misconceptions. Additional analyses suggested some lack of consistency between the item writer DOK ratings and the committee DOK ratings. Some notable differences were found across alternate assessment levels and content areas. Implications for future item writing training and alignment studies are provided.