MulticamDIC

The MulticamDIC is a combined, stereo-rig array, Digital Image Correlation (DIC) measurement system consisting of 4 or more (up to 16), USB3, or GigE cameras. This advanced, application-specific measurement system gives testing engineers the ability to perform large-scale and complex (contoured) surface testing of sub-(components) and structures.

One of the key benefits of using a MulticamDIC system is that the Field-of-View (FoV) can be expanded to multiple m² (up to ca. 25-30 m²), using the added view provided by multiple cameras (without reducing the spatial accuracy). This allows for complete measurement visualization of entire components, objects, and structures.

In a MulticamDIC system, cameras can be arranged freely in a clustered array, as opposed to being arranged in pairs. For example, the FoV area of using a (16-camera) MulticamDIC system can be enlarged by up to 8x, compared to the FoV provided by a single, stereo-rig DIC system (with the same spatial resolution).

Using the MulticamDIC system, multiple cameras can be arranged, configured & setup in a clustered array for specific materials testing applications. For example:

• a single-sided (planar) array can be configured for the testing of large-scale and complex (contoured) surfaces (i.e. for wings, blades, beams, and walls),
• a single-sided (cylindrical/spherical) array can be configured for the testing of round/cylindrical/spherical surfaces (i.e. for pressurized cylinders or inflated objects), and
• a double-sided (bi-planar) array can be configured for the testing of the true strain via measurement of the cross-section

The advantage of a MulticamDIC system is that measurements can be performed using DIC of large, complex (contoured) surfaces, and double-sided geometries, that would otherwise not be possible to measure using a single, stereo-rig DIC system.

Possible material testing applications with the MulticamDIC system include; simple, quasi-static tension, compression, buckling, bending, and fracture mechanic testing, but also low-speed fatigue and inflation (pressure) testing.

The MulticamDIC system utilizes five, core advanced algorithms and concepts exclusive to Istra4D.

1. Clustered Bundle-Adjustments Algorithm (CBAA)
2. Central Reference Camera Perspective (CRCP)
3. Multicamera Cluster Approach (MCA)
4. Object Aligned Parameterization (OAP)
5. Multicamera Subset Reference Tracking (MSURET)