数字散斑相关技术进展及应用

The Progress and Application of Digital Speckle Correlation Method

数字散斑相关技术是廿世纪末发展的一项光力学测量技术,历经20年各国学者的研究改进积累,目前已成为一种成熟的测量方法,并已成功地应用于力学测量中。本文回顾和叙述了这些进展,并列举在各方面的应用实例以进一步扩展其应用领域。数字散斑相关技术的八个关键问题即1.相关公式,2.搜索技术,3.亚像素搜索,4.散斑图,5.减噪,6.补偿技术,7.位移场至应变场转换,8.三维位移场测量。最后将叙述数字相关技术在材料测试、结构模型及实物监测、岩石力学、复合材料性能研究、生物力学等方面的广泛应用情况。

Digital speckle correlation technique is one of the measuring techniques of photomechanics in twenty century. After the research of domestic and abroad scholars in the past twenty years, this technique becomes a mature measuring method and was applied successfully in mechanical measurements. The review and application examples are presented in this paper. Eight key problems are reviewed that are 1 Correlation formula, 2 Search technique, 3 Sub-pixel search, 4 Speckle pattern, 5 Noise reduction, 6 Compensation technique, 7 Displacement field to strain field and 8 3D displacement measuring. The widely application examples on material testing, structure inspection, rock mechanics composite material study, biomechanics are presented at the end of the paper.