In this application video, a 4-cam 5 Mpx MulticamDIC system is used to measure the total displacement
(with Rigid Body Motion Removed) of a Polycarbonate Coupon in the new Istra4D V4.13 software.
New features from the Istra4D V4.13 software presented in this application video include;
- Image Rotation, in each camera view by +90° intervals
- Startpoint Enhancements, using a new User-Interface (UI) and faster & more intuitive search algorithm
- Plate Data Labelling, allowing freely definable plates to be added anywhere in a visualization
with any active (visualized) or static data values.
In the live setup mode, each view from all 4 cameras is presented for which a bi-planar double-sided setup of
2 paris of camreras is used around a central polycarbonate coupon. When using a MulticamDIC system, the
Speckle Pattern Quality Evaluator and variable Region-of-Interest (RoI) settings can still be used in live mode,
for all 4 cameras.
The Region-of-Interest (RoI) is adjusted in the horizontal resolution direction. In each camera view, the RoI can
be shifted to the middle of each camera image.
Image rotation, in Istra4D 4.13, is changed through selection of the +90° rotation intervals from the User Toolbar.
Each camera view can be independently changed, in every phase within the measurement process (live setup,
projection calibration, meas. series playback, correlation evaluation, and graphical visualization).
Within the live projection calibration mode, the projection of all 4 cameras is completed together using a
double-sided calibration target. The colour of the centre circles on the target indicates the front-side (white) and
rear-side (red), for which the rear-side coordinate system is inverted in the X-direction. Automatic QR-code detection
of the calibration target ID is also available. In a multicamera DIC setup, each camera automatically detects the grid
intersection points of the calibration target and acquires a snapshot. The number of frames acquired per camera is
shown in the first indexed number and the number of total frames acquired for all cameras within the calibration is
shown in the second indexed number. The computation of the projection parameters is determined, live, online during
the calibration itself with a live feedback status.
Using the recording procedure, at the acquisition frame rate of 10 fps, every 10th image is acquired and saved directly
to the harddisk.
In the correlation evaluation, the alignment of the facets/subsets is selected to be with respect to an object as opposed
to a reference camera plane. This allows parameterization alignment of the facets/subset to be that of an idealized
model – for this case a bi-planar model is selected. This allows gauge points to be extracted on adjacent planes on
the surface.
Additionally, within the correlation evaluation, the new Startpoint Enhancements feature of Istra4D V4.13 can be seen.
Utilizing a new UI with an upper table (step/startpoint) and lower table (camera/startpoint), a quick and clear overview
of which startpoints have been found is now easy to see. As shown in the application video, only 4 startpoints are actually
used for the measurement (Startpoints 0 & 1 in Cameras Front 1-2 and Startpoints 6-7 in Cameras Rear 1 & 2)
In the graphical visualization, the 2D-overlay of the total displacement (with Rigid Body Motion Removed) can be seen.
A temporal plot is also created using a virtual line gauge of the engineering line strain (in mstrain) and path length
change (mm). The new Gauge Plate Data Labelling feature in Istra4D V4.13 is also presented, whereby a plate is
created for which data can be freely added, either from data within the entire evaluated grid are, or that from virtual
gauges. Additionally, the active quantity of the selected visualization display can also be added to any plate.
Finally, a point gauge is also created, for which a duplicate point on the adjacent surface side of the coupon
(from the biplanar setup) is additionally established. This allows the absolute thickness and thickness change parameters
to be determined, as shown in the temporal plot. It appears that the sample only reduced in thickness by 30 um,
before fracture. The sample fractured at 110 mstrain at 1.05 cm deformation.
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