Image Systems – Digital Image Correlation (DIC)
TEMA DIC System is a complete system solution including all the required hardware and software for non-contact optical analysis for surface strain and displacement.
The system is designed for easy set-up and use. The components are delivered in appropriate transport cases and are thus highly portable.
Camera and lighting are mounted on a stable and flexible 3-axis geared head, attached to a perpendicular bar allowing for rough and fine position tuning. Calibration is done to correct for both lens distortion and angled motion plane deviation between the camera and the specimen. This feature is unique to TEMA DIC and enables the 2.5D tracking capability.
Good for movement which occurs in a single plane.
Is suitable for measuring deformation and movement in a surface that is irregular, has any movement that is not planar or similar deformities. For example, object is bending or compressed, round or curved objects.
The Stereo version of DIC uses two cameras to pin-point the 3D-coordinates of all points in an area of a surface, this allows for 3D and 2D measuring of full field displacement and strain. The sophisticated algorithms calculate the complete strain tensors for the full-field solution, including many different strain formulations, such as Green-Lagrange, Euler-Almansi and Cauchy strain tensors. The camera calibration is done as in other applications, using a target or multiple points and a known distance.
Points of Interest, Inspection lines and Virtual Extensometers can be placed on the surface to measure strain at specific points or along specific lines. The Virtual Extensometer is similar to an actual extensometer and measures the distance between two points to achieve extension and engineering strain.