This paper presents a method to analyze 3D displacement data captured by digital image correlation (DIC) method over a long period of time. It allows monitoring of an object when a 3D DIC setup is not fixed in the same position between a consecutive series of measurements. An implementation of the data merging procedure is described and a proof of concept is provided using example measurements for both a numerical model and a real experiment in laboratory conditions. We evaluated the accuracy and discuss the main sources of errors. The obtained results prove the method is feasible for in situ long-term measurements and monitoring in industry and civil engineering.
© 2013 Optical Society of America
Original Manuscript: March 15, 2013
Revised Manuscript: May 24, 2013
Manuscript Accepted: May 26, 2013
Published: June 27, 2013
Marcin Malesa and Malgorzata Kujawinska, "Deformation measurements by digital image correlation with automatic merging of data distributed in time," Appl. Opt. 52, 4681-4692 (2013)