Tuesday  |  Salon 7  |  09:20 AM–09:40 AM

#16370, New Improvements in DIC in the Areas of Data Processing, Vibration Visualization, and External Analog Data Recording

The demand for using stereo digital image correlation (DIC) for measuring operation deflection shapes (ODS) is on the rise, and there is a growing need to process large amounts of stereo images faster. Historically, there has been little demand to analyze more than a few hundred images per DIC test, due to the nature of the experiment. However, vibration measurements generally require thousands of image pairs to be analyzed per test, which may take upwards of one or more hours to process, depending on the efficiency of the source code. This talk will explain a new method that stores image files in a way that improves the speed of the DIC algorithms, decreasing processing time, without altering the images in any way.

Animating the in-plane and out-of-plane ODS’ components is not a trivial task, because this generally requires two-dimensional (in-plane) amplitudes to be displayed as an exaggeration within the image or in the 3D environment in order to visualize the behavior of the vibration. Moving the collected data to a dedicated workspace within the program allows the user to easily visualize and understand the behavior of the ODS. An overview of the new workspace will be explained using example data.

Analog data acquisition systems have been utilized with DIC systems for decades. These devices provide the ability for users to record external analog data, such as a load signal, cross-hair displacement, thermocouple data, and more. They also add the ability for a) digital and analog triggering of cameras, vibration, fatigue, and strobeoscopes, b) outputting real-time DIC measurements, c) synchronizing data from extremely dynamic events, and d) providing triggers to other systems. Off-the-shelf DAQ systems are not only expensive, but they generally include features that are not required for most DIC systems. A look at new custom-designed systems will be discussed that will provide a more streamlined user experience without sacrificing accuracy or expense.

Alistair Tofts   Correlated Solutions, Inc.