Digital image correlation method (DICM) is described as a robust in-plane deformation
measuring method due to its simple optical setup and the insensitivity against ambient noise. Based
on DICM, digital speckle projection has been developed for shape measurement. This paper
explores the possibilities for vibration analysis using digital speckle projection together with DICM.
A digital speckle pattern, generated by computer, is projected on an object surface using an LCD
projector. Then the dynamic deformation modulated speckle images are captured by a high-speed
CCD camera and saved in the computer. By using the self-developed temporal sequence digital
images correlation algorithm, the deformation and vibration mode can be analyzed quantitatively.
The proposed method avoids using stroboscopic or laser illumination and simplifies the
experimental setup for vibration measurement, while it is time-consuming thanks to calculating a
large amount of correlation coefficients. The experimental performance on a harmonic-vibrating
cantilever beam well demonstrates the validity of the new method.
Speckle pattern creation methods for two‐dimensional digital image correlation strain measurements applied to mechanical tensile tests up to 700°C
