基于EALCD的数字散斑照相术面内位移测量.pdfVIP

学兔兔 第31卷 第8期 仪 器 仪 表 学 报 V0l_31 No．8 2010年8月 Chinese Journa【of Scientific Instrument Aug．2010 基于EALCD的数字散斑照相术面内位移测量 张鹏飞，郭 俊，王文生 (长春理工大学现代光学测试实验室 长春 130022) 摘 要：提出了散斑照相术数字化的技术，即利用电寻址液晶(EALCD)和CCD取代传统散斑照相术中记录干板，省去传统方 法中干板显影、定影的烦琐的化学湿处理过程，实现其数字化。介绍了EALCD在散斑照相术测量高精度测量物体位移的优点， 而且能通过现有的数字器件使其实现数字化，更加利于工程应用。采用全场分析法和逐点分析法2种方法对散斑照相术进行 光学实验研究，都成功获得了含有物体位移信息的干涉条纹。实验研究表明，i亥研究方法简单、高效，能快速获得具有高对比度 的散斑干涉条纹，为数字散斑照相术测量物体的微小形变奠定了坚实的基础。 关键词：散斑照相；电寻址液晶；CCD；全场分析；逐点分析 中图分类号：TN29 文献标识码：A 国家标准学科分类代码：410．630 In-plane displacement measurement of digital speckle photography based on EALCD Zhang Pengfei，Guo Jun，Wang Wensheng (Laboratory ofContemporary Optical Measure Technology，Changchun University ofScience and Technology，Changchun 130022，China) Abstract：The digital technology of speckle photography is put forward，using EALCD(electrically addressed liquid crystal display)and CCD instead of recording media used in the traditional speckle photography．The method leaves out the wet chemic~process of developing and fixing，which makes the speckle photography realize digita1．It intro— duces the virtue of speckle photography in measuring the displacement of object with high precision，and realizes dig- italization，which is more useful to engineering application．The application of the method，the full field analysis and the point for point analysis，has obtained the interference patterns including the information of objects displacement． The experimental result shows that the research method is not only simple and hi