Coherent microscopy by laser optical feedback imaging (LOFI) technique

The application of the non-conventional imaging technique LOFI (laser optical feedback imaging) to coherent microscopy is presented. This simple and efficient technique using frequency-shifted optical feedback needs the sample to be scanned in order to obtain an image. The effects on magnitude and phase signals such as vignetting and field curvature occasioned by the scanning with galvanometric mirrors are discussed. A simple monitoring method based on phase images is proposed to find the optimal position of the scanner. Finally, some experimental results illustrating this technique are presented.     

基于PhotoModeler Scanner的普通数码相机快速检校研究

随着分辨率的不断提高与价格的日益降低,数码相机已成为近景摄影测量的基本设备,而相机的准确检校是保证量测精度的关键因素.借助于PhotoModeler Scanner软件,本文实现了相机的快速准确检校,并对野外检校的稳定性和质量进行了分析,说明该检校方法简便可靠.     

Design and validation of a grinding wheel optical scanner system to repeatedly measure and characterize wheel surface topography

This paper describes the design and validation of an upgraded grinding wheel scanner system that controls the position of a Nanovea CHR-150 Axial Chromatism sensor along the x- and y-directions of the wheel surface to measure and characterize wheel surface topography. The scanner features a novel homing system that enables the wheel to be removed from the scanner, used on a grinding machine and then re-mounted and re-homed so that the same location on the wheel surface can be repeatedly measured and monitored. The average standard deviation for homing was 27.6 μm and 19.3 μm in the x- and y-directions, respectively, which is more than adequate for typical area scans of 25 mm². After homing, the scanner was able to repeatedly measure features that were similar in size to an abrasive grain (∼200 μm diameter) with an average error of 9.3 μm and 5.9 μm in the x- and y-directions, respectively. The resulting topography measurements were compared with Scanning Electron Microscope images to demonstrate the accuracy of the scanner. A custom particle filter was developed to process the resulting data and a novel analysis technique involving the rate of change of measured area was proposed as a method for establishing the reference wheel surface from which desired wheel topography results can be reported such as the number of cutting edges, cutting edge width and cutting edge area as a function of radial depth.     

业务逻辑编译器的设计与实现

本文介绍了一种应用程序中业务逻辑的实现方案。该方案使用脚本语言来定义业务逻辑,由业务逻辑编译器来生成代码,从而提高业务开发的效率和扩展性。业务逻辑编译器由业务解释模块和业务执行模块组成。该方案已在电信领域投入使用,取得了预期的效果。     

LexAGen: An interactive incremental scanner generator

This paper describes LexAGen, an interactive scanner generator which is the first component of an interactive compiler generation environment. LexAGen can generate fast scanners for languages whose tokens can be specified by regular grammars. However, LexAGen also supports several context-sensitive programming language constructs such as nested comments and the interaction between floating-point numbers and the range operator in Modula-2. In addition, LexAGen includes a fast new algorithm for keyword identification. However, the most important and novel aspects of LexAGen are that it constructs scanners incrementally and that specifications can be executed anytime for validation testing. LexAGen specifications are expressed and entered interactively in a restricted BNF format (no left recursion). All syntactic errors and token conflicts are detected and reported immediately as LexAGen incrementally constructs a deterministic finite automaton to represent the scanner. At any time, the user can test the scanner fragment which has been entered by supplying text to be scanned. Alternatively, the user can generate a C-code scanner from the automaton. The generated automaton uses a direct execution approach and is quite fast. LexAGen is implemented in Smalltalk-80. Its extensive use of interactive graphics makes it very easy to use. In addition, the object-oriented paradigm of Smalltalk-80 is the basis for the incremental analysis, the error detection scheme and an intermediate representation which can be easily modified to generate scanners in other target languages such as Pascal, Modula-2 and Ada.     

扫描仪电源常见故障的检修

电源部分在扫描中的作用是非常重要的,其性能的好坏真接影响着扫描仪的工作质量,本文首先介绍了扫描仪电源的工作原理,然后详细分析了扫描仪电源部分常见故障的产生原因及检修方法。     

活套扫描器在轧线中的应用及常见故障分析

本文介绍活套扫描器在轧机控制系统中的应用及常见故障分析,并且通过实际操作总结出一些工程应用中的维护经验,适应于实际工程。     

Scanner design

The scanner is a subroutine which is frequently called by an application program like a compiler. The primary function of a scanner is to combine characters from the input stream into recognizable units called tokens. A method has been presented in this paper for designing such a scanner, also frequently referred to as a lexical analyser in the current literature. The major steps involved in this design process are: identification of tokens, construction of a state diagram, building driver tables and finally writing a scanning routine. The rules for generating the driver tables are described and an algorithm for the scanner, utilizing these driver tables, is included. The method has been successfully used to build the system scanner for a user oriented plotting language. It is concluded that the method is well defined, gives rise to a modular design and as such easily lends itself to language extensions.     

胶片扫描仪和记录仪色彩特性及其文件格式的应用

Cineon或DPX是胶片扫描仪和记录仪常用的文件格式,它是底片密度的线性表达,并且与对数场景亮度成为线性关系,带线性场景亮度的线性编码图像格式需要较高的比特深度。扫描仪感应的不是底片密度,而是底片的透光率,透光率需转换成有意义的影像衡量单位。因为转换时有损失,所以扫描的比特深度要高于输出的比特深度,这样避免图像失真。扫描的底片图像应记录到中间片胶片上,这样避免出现多余的颗粒,胶片记录仪输出的数字中间底片必须与传统洗印制作的翻底有相同的密度范围。本文较详细的介绍了胶片扫描仪和胶片记录仪的M状态、印片密度、彩色正片密度和传感器之间的关系及其它们的彩色特性,对文件格式的正确使用、底片密度和10比特对数代码值之间的关系,进行了分析。     

基于Scanner模块的DeviceNet网络的研究

本文介绍了一种当今国际上比较流行的现场总线标准DeviceNet。并阐述了基于Scanner模块的DeviceNet网络的功能和具体实现方法。