Digital Photoelasticity
Digital Photoelasticity
复制标题
数字光弹性
DOI：
10.1088/0957-0233/11/12/704
复制
发表时间：
2000
影响因子：
2.4
通讯作者：
K Ramesh
中科院分区：
文献类型：
--
作者：
K Ramesh
这本书的既定目标是：提供数字光弹性的基本概念和方法的介绍;发展一个基础，未来的研究人员和学生可以发展自己的新的和富有成效的想法;促进数字光弹性公式的研究，并促进这些技术在工业中的应用。它成功地实现了第一个目标，但福尔斯达不到其他目标;特别是，几乎没有包括说明性的工业应用。每一章都有一个全面的参考清单，这将使读者能够更详细地探讨主题。透射光弹性和反射光弹性的基本原理在开头两章中叙述。有一个很长的一节条纹排序，这是令人惊讶的，因为许多数字光弹性技术消除了它的需要。数字图像处理介绍的水平，将是有用的应力工程师谁没有在这个问题上的正式培训。主题包括图像传感，显示，感知和存储和软件操作，包括图像采集，增强，分割和过滤进行了讨论。这一章对研究人员、学生和计算机爱好者都很有用，但硬件部分可能很快就会过时。早期的自动光弹性技术在题为“条纹倍增、条纹细化和条纹聚类”的一章中一起全面地讨论，并再次讨论了条纹排序的问题。在一章中介绍了现代数字光弹性的主要技术，相移法、偏振法和傅里叶变换法。在这种安排中，相位步进方法得到了大多数的关注，包括详细讨论其变体和错误的来源和处理。偏振步进和傅立叶方法被视为穷人的关系，这可能是合理的，在目前的普及，但似乎不适合数字光弹性教科书。相位解缠的过程在单独的章节中描述，与光学平铺一起，但未讨论等倾和等色数据的解调问题。这种排放使学生没有能力构建自己的算法。彩色图像处理，主要集中在红色，绿色和蓝色（RGB）的方法，和光谱内容分析的解释，连同相关的硬件及其局限性。描述接触和断裂力学评估的章节在其领域的覆盖范围内是狭窄的。该技术的应用，以直齿圆柱齿轮提供了一个机会，这是错过了，以处理与相互作用的接触和裂纹尖端奇异性的问题。对应力分离的处理同样很差，历史问题得到了全面的处理，但现代发展被忽视或只给予短暂的关注。包含快速原型可能在第一次似乎不合时宜，但这是一个使模型制作，这是光弹性的一个组成部分的数字技术。这一章为那些新的主题提供了一个有价值的见解。如果读者想在最后一章中看到关于最近发展和未来趋势的未来图景，他们会感到失望;相反，它看起来更像是一个松散的结尾或事后思考的集合。综合光弹性和动态光弹性被回顾并确定为未来研究的肥沃领域，但几个研究小组已经在这方面取得了进展，因此本章很快就会过时。光弹长大的弗罗赫特的书籍会发现质量的照片在这本书穷人。这位评论家发现随书提供的CD-ROM没有什么价值，因为只提供了两个可执行程序，其余的程序需要读者使用未提供的turbo C或turbo C++编译器进行编译。其中一个可执行程序不能工作，另一个只是显示了一组不同相位步进算法的图像，这些图像可以很容易地包含在书中。每一章的结尾都有练习，这对学生和老师都很有用。这是该领域的第一本专著，尽管在某些方面达不到其目标，但仍是一个有益的贡献。E A Patterson
The stated objectives of this book are: to provide an introduction to the basic concepts and methodologies for digital photoelasticity; to develop a foundation on which the future researcher and student can develop his own new and fruitful ideas; to promote research in the formulation of digital photoelasticity and to promote the application of these techniques to industries. It succeeds in its first objective but falls short of the others; in particular, almost no illustrative industrial applications are included. Each chapter has a comprehensive reference list which will allow the reader to pursue the topics in more detail. The fundamentals of transmission and reflection photoelasticity are described in the opening two chapters. There is a long section on fringe ordering, which is surprising given that many digital photoelastic techniques eliminate the need for it. Digital image processing is introduced at a level that will be useful for stress engineers who have not been formally trained in the subject. Topics including image sensing, display, perception, and storage and software operations including image acquisition, enhancement, segmentation and filtering are discussed. This chapter will be useful to researchers, students and practicioners, but the hardware section is likely to be out of date quite quickly. Early techniques of automated photoelasticity are dealt with together and comprehensively in a chapter entitled: Fringe Multiplication, Fringe Thinning and Fringe Clustering, and the subject of fringe ordering is discussed again. The major techniques of modern digital photoelasticity, phase shifting, polarization and Fourier transform methods are dealt with in a single chapter. In this arrangement the phase-stepping method received the majority of the attention including detailed discussion of its variants and the sources and treatment of errors. Polarization stepping and Fourier methods are treated as poor relations, which might be justified in terms of current popularity but seems inappropriate for a textbook on digital photoelasticity. The process of phase unwrapping is described in a separate chapter, together with optical tiling, but the issues of demodulation of the isoclinic and isochromatic data are not discussed. This emission leaves the student unequipped to construct their own algorithms. Colour image processing, focused principally on the red, green and blue (RGB) method, and spectral content analysis are explained, together with the associated hardware and its limitations. The chapter describing the evaluation of contact and fracture mechanics is narrow in its coverage of the field. The application of the techniques to a spur gear provides an opportunity, which is missed, to deal with the issues associated with interacting contact and crack-tip singularities. The treatment of stress separation is similarly poor, with historical issues dealt with comprehensively but modern developments ignored or only given brief attention. The inclusion of rapid prototyping might at first seem out of place, but this is an enabling and digital technology for model making which is an integral part of photoelasticity. This chapter provides a valuable insight for those new to the subject. Readers looking for a vision of the future in the closing chapter on recent developments and future trends will be disappointed; instead it appears more like a collection of loose ends or after-thoughts. Integrated photoelasticity and dynamic photelasticity are reviewed and identified as fertiles areas of future research, but several research groups are already making progress here so the chapter will be out of date very quickly. Photoelasticians brought up on Frocht's books will find the quality of the photographs in this book poor. This reviewer found the CD-ROM supplied with the book of little value because only two executable programs are supplied and the remainder of the programmes require compiling by the reader using a turbo C or turbo C++ compiler that is not supplied. One of the executable programs did not work, and the other simply showed a set of images for different phase-stepping algorithms, which could be readily included with the book. Each chapter contains exercises at the end, which will be useful for students and teachers. Some of the exercises are linked to the uncompiled programs on the CD-ROM. This is the first monograph in its field and forms a useful contribution despite falling short of its objectives in some areas. E A Patterson