Vic-3D Educational System

The new VIC-3D Educational (EDU) System from Correlated Solutions is a low-cost solution developed for academic institutions to assist in teaching the Digital Image Correlation technique to undergraduate and graduate students.

The VIC-3D EDU system utilizes the same accurate DIC algorithms found in the powerful VIC-3D software, while allowing users to acquire data quickly and easily. The system features a simplified setup, streamlined image acquisition, and ideal post-processing features. The stereo cameras are mounted inside a protective enclosure, which includes an integrated LED light source, a cooling fan, and an exterior USB & power connectors. The system also includes a tripod, tripod head, speckle roller, ink pad, calibration target, and a convenient carrying case.

This product is the perfect addition to engineering courses such as solid mechanics, measurements, structures, automotive design, aerospace, safety, FEA validation, and many others. Furthermore, the VIC-3D EDU software has the ability to process images acquired from any VIC-3D EDU system, which allows users to share images not only across campus, but also with colleagues at other universities. The system simply requires a computer with one available USB3 port and one available power source. Whether you are teaching students new measurement techniques or validating FEA models, this system will surely enhance the quality of your department’s curriculum.

 

 

VIC-3D Educational System

 

 

VIC-3D Educational System specifications:

 

Camera Resolution 1920 x 1200 (2.3 Megapixels)
Frame Rate 20Hz live, .5Hz acquisition, 100 frames per capture
Exposure Time 19µs – 1s
Field of View Fixed: 150 x 200mm
Displacement Resolution In-plane: +/-2µm; Out-of-plane: +/-4µm
Strain Measurement Resolution 50µε
Strain Measurement Range  0.005% to >2000%
VIC-3D EDU Licenses Unlimited
Software Features 3D displacements, strains, graphing tools, and much more

 

For more information or a quotation please don’t hesitate to contact us on info@isi-sys.com  or via phone: +49 561 739798-0.

3D-Micro-DIC

strainograph-3d-camThe Strainograph-3D camera (SG-3D) is used for full-field strain, deformation, and fatigue measurements on small field of view with high resolution (5Mpx) or as 3D Video-Extensometer (up to 500Hz). The measurement principle is digital image correlation based on the world wide established VICTM software (VicSnap, Vic-3D and Vic-Gauge) of Correlated-Solutions. The isi-sys sensor hardware and Vic-software are fusing to a practical high end device for quick and reliable operation in material testing and structural analysis.

 

 

Advantages and features of  the SG-3D system:

  • Compact and rigid design, quick set-up and easy handling
  • Pre-adjusted, fixed field of view and stable calibration
  • Specially designed for small and very small field of view (FOV)
  • Reliable and fast USB 3.0 interface for Desktop or Laptop PCs
  • Turn-key solution including Vic-Snap and Vic-Gauge 3
  • DRobust and reliable post-processing with Vic-3D

 

 

strainograph-test-sample

 

strainograph-diagram

 

 

 

 

 

 

 

 

 

 

 

 

Technical highlights of Strainograph SG-3D

  • 3D full field (5Mpx@75Hz frame rate) continuously recording on SSD
  • Higher framerates at reduced resolution
    (e. g. [Pixel@Hz]: 1600×1200@133; 1920×1080@148; 1280×720@217; 800×600@258; 640×480@315; 320×240@576).
  • suitable for Video-Extensometer functions and real time feedback control
  • Strain noise level of ±0,001% (±10µstrain) and better by time averaging
  • Deformation sensitivity in nm range (1/100 pixel) depending on FOV

 

 

Available measurement volume versions [mm]

height width depth
4,2 3,5 0,16
5,6 4,7 0,23
8,4 7,0 0,40
11,3 9,4 0,63
16,9 14,1 1,27
25,4 21,2 2,50

 

 

Data acquisition units (DAQ) for SG-3D

  • strainograph-daq2Image synchronised analogue data recording (8x differential mode,16 bit, ±10V)
  • 2 x analogue output channels for feedback control (16 bit, ±10V)
  • Camera triggering and (optional) phase synchronisation for periodic signals
  • Fully integrated and supported by all VIC TM software modules

 

 

 

Principle of Digital Image Correlation

Digital Image Correlation (often referred to as “DIC”) is an easy to use proven optical method to measure deformation on an object surface. The method tracks the gray value pattern in small neighborhoods called subsets (indicated in red in the figure below) during deformation. Digital Image Correlation has been proven over and over to be accurate when compared to valid FEA models. The commercially available VIC-2D and VIC-3D systems from Correlated Solutions both utilize this advanced optical measurement technology.

 

Digital Image Correlation Overview

Below are the reasons why its versatility, robustness, and ease of use make it the only choice when it comes to digital image correlation.

DIC - Principle of Digital Image Correlation

Two-dimensional Example

In the two pictures below you can see a speckle pattern on an aluminum sample with two offset semi-circular cut-outs. The two pictures were taken from an animation with the left image taken from the beginning and the right picture taken from the end of the animation. Since the deformation is predominantly in-plane, a single camera can be used to measure the deformation.

VIC2D

Small Deformation

VIC2Da

Large Deformation

The pictures below show the horizontal strain measured by two-dimensional image correlation for the pictures shown above.

VIC2D-2 VIC2D-2a
VIC2D-2b


Three-dimensional Example

These two speckle images below were taken simultaneously with the left and right camera of a stereo-system. The sample itself is a piece of glass with the company logo sticker adhered to the surface.  The speckle pattern was applied using standard off-the-shelf flat white and black spray paint.  Can you make out the shape?

VIC3Dleft

Left View
VIC3Dright

Right View

In the plot below the shape of the logo sticker measured with the VIC-3D System is shown. The thickness of the logo sticker is approximately 0.003″ or 0.070mm.

VIC3D-2
For more infomation have a look at our DIC products or contact us via info@isi-sys.com or +49 561 – 739798-0

Combination of Digital Image Correlation and Thermography

Thermography is based on the principle that induced heat in mechanical components causes a different temperature field in the area of defects or inhomogeneities. The digital image correlation is a powerful system for measuring and visualizing strain, deformation and 3D surface shape.

The VIC-3D IR System features an infrared (IR) camera that is integrated with the DIC cameras enabling temperature data to be accurately acquired and analyzed with the full-field strain and deformation data. The system works by first calibrating the intrinsic optical parameters of the IR camera and then calibrating the position of the IR camera relative to the stereo DIC system. This triangulation allows VIC-3D to place the thermal and strain (or deformation) as well as 3D surface data into a common coordinate system.

The calibration procedure has been streamlined by integrating the IR camera into our VIC-Snap image acquisition software, which allows the user to capture images from the IR and DIC cameras simultaneously. The result is an easy to use turn-key thermal imaging system that utilizes digital image correlation to accurately measure temperature and strain concurrently without any contact with the sample. Thermal and strain data can be viewed, analyzed, and extracted over the entire field or at precise locations.

The system is sold as a turn-key solution which includes all software, hardware, onsite installation, and one year of unlimited technical support and software upgrades giving you piece of  mind that your system functions as intended, so you can start acquiring data immediately. This unique thermal integration capability may also be added to any existing VIC-3D system for increased functionality.

System Configuration and Features

Both the IR camera for thermography and the two CCD cameras for 3D image correlation are mounted on a standard stereo bar.

  • Temperatures up to 2,000C
  • Synchronized IR and DIC images
  • User-friendly setup and calibration
  • Uniquely designed IR calibration targets
  • Analog data synchronization
  • Extract points, regions, or node locations for FEA validation
  • Accurately measure deformation and thermal data concurrently
  • Remotely view and acquire images using the Vic-Snap remote
  • Measure 3D full-field displacements and strains
  • All the features for the VIC-3D system included

dic-thermografie

Advantages of this multi-function device are all applications with component deformations caused by thermal energy like current flow. This product allows a simultaneously determination of the heat flows as well as strain and deformation.

 

Example 1: Photovoltaic Module

Defective photovoltaic modules have been measured during operation over several minutes.  A preparation with speckle pattern is necessary for digital image correlation (here the backside of the panel). The marked areas are heated up due to electric/mechanical errors during operation.

 

Principal strain (epsilon 1) over time (index) of the points C0, C1, C2 shown in the image below. Following three dimensional presentation of the temperature values.

 

 

Three dimensional graph of the conture, superposed with the measured temperature (colour scale).

 

 

Three dimensional graph fo the conture, superposed with the strain measurement (colour scale).

 

Example 2: Analysis of simultaneous one-sided heating and compressive loading on an e-glass/vinyl ester/ balsa wood sandwich composite sample

Understanding thermo-mechanical behavior of material can be a vital component when designing vehicles  and structures that may become exposed to high temperatures. Virginia Tech’s Extreme Environments, Robotics, and Materials (ExtReMe) Laboratory focuses on the impact of extreme environments on materials. This includes research that is focused on understanding the thermo-mechanical behavior of materials both during and following fires. Experimental investigations are performed to understand the evolution of the material due to elevated temperature.

The senior research associates in the lab used the VIC-3D IR system to find the effects of a simultaneous one-sided heating and compressive loading test on an e-glass/vinyl ester/balsa wood sandwich composite sample. As one researcher stated, “The VIC-3D IR system identied several transient events during the compression tests which would not have otherwise been fully understood using either DIC or IRT independently. Through this testing, several features of sandwich composite thermomechanical behavior  were elucidated which would not have been possible with traditional point measurements (e.g. strain gages, defectometers, or thermocouples).”

Image above: Analysis of simultaneous one-sided heating and compressive loading on an e-glass/vinyl ester/ balsa wood sandwich composite sample, Identifying several transient events, which  would  not  have been  fully  understood  (stated by the enginners of Virgina Tech´s ExtReMe Laboratory) using  either  DIC  or  IRT independently or only applying traditional  point  measurements  (e.g.  strain gages, deectometers, or thermocouples).  Source:  Virgina Tech´s ExtReMe Laboratory

 

Vic-3D Stereo Microscope

The Vic-3D Micro system is a new addition to the Vic-3D product line of measurement solutions. Vic-3D Micro enables accurate displacement and strain measurements under high magnification.

BackgroundStereomikroskop2

Three-dimensional digital image correlation (DIC) has found widespread popularity for strain measurements due to its excellent accuracy, robustness and ease of use. However, 3D measurements have been difficult to obtain on specimens where high magnification is required. This is mainly due to the lack of optics with sufficient depth-of-field to acquire two high magnification images from different viewing angles.

Stereo microscopes overcome these depth-of-field limitations. However, the internal construction of stereo microscopes prevents proper correction of image distortions using traditional models, such as Seidel lens distortions. These uncorrected images will result in severely biased shape and strain measurements. In fact, it is not uncommon to observe bias levels of several thousand microstrain.

To overcome this problem, Correlated Solutions, Inc., has developed and patented an easy-to-use calibration method that does not suffer from the problems associated with traditional parametric distortion models. The calibration method computes the non-parametric distortion fields of the stereo microscope and has been shown to completely eliminate shape and strain bias from the measurements.

System Features

  • Field of view (zoom range): 0.8mm-7mm
  • Full-field measurements of 3D coordinates, displacements, velocities, and complete strain tensors
  • Automatic calibration
  • Image pairs can be automatically overlapped with a simple adjustment
  • Powerful tools for visualizing data
    • Contour displays which can be overlaid onto images of the test specimen
    • Data extraction from 3D plots based on user defined lines and circles
    • Post-processing tools for statistical analysis, stress-strain curves, and more
  • Convenient exporting of data with the FLEXPort data tool
    • Data can be exported in Tecplot/plain ASCII, Matlab, and STL formats
    • Node data can be easily extracted for FEA validation
  • One year of technical support and software upgrade
  • One-year replacement warranty for defects in materials and/or workmanship on all parts

 

Application examples about Vic-3D Micro:

Servered ceramic capacitor chip under bending load

Combination Stereomicroscope and Vic-3D digital image correlation

Combination of Fulcrum and FFT module

The combination of the new Vic-3D FFT-Module and the known synchronisation / trigger device with Fulcrum module of isi-sys GmbH / Correlated Solutions INC for Vibrocorrelation permits full modal and vibration analysis using conventional low speed cameras. It can be applied on objects with high frequency excitation, which can replace High-Speed (HS) cameras, when conventional shakers are used for excitation.

 

Excitation signal

A periodic vibration signal with a wide frequency spectrum (e. g. chirp, fast sweep) is applies to a structure via an electrodynamic, hydraulic or piezo shaker. The cameras of a stereoscopic system are set to a short exposure duration (we use 200μs here) and they are triggered though the Fulcrum module of Vic-Snap.

The excitation signal is shown in the images below. A pulse is generated by the function generator for each cycle of the excitation (chirp) signal and connected to the synchronisation device below.

Anregungssignal

Image 1 – Frequency spectrum

Anregungssignal 2

Image 2 – Excitation signal

 

SynchronisationTrigger device

 

The cameras are triggered through the standard synchronisation/trigger device  DAQ-STD-8D controlled by the Fulcrum Module for Vic-Snap/ Vic-3D.

 

 

FFT Module Evaluation Examples

The following results show the workspace of the FFT Module in Vic-3D with amplitude (left) and phase (right). Shifting the frequency value in the graphs below (amplitude or phase vs frequency) permits to select the corresponding mode shape for any analysed frequency. The amplitudes (left) are displayed here as 3D plot, other options are e.g. generation of animated videos of the mode shape vibration.

The results on a sqare plate 140 x 140mm of different resonance frequences are shown in the images below.

263Hz

Image 3 – Resonance at 263 Hz

 

707Hz

Image 4 – Resonance at 707 Hz

 

875Hz

Image 5 – Resonance at 875 Hz

 

 

Application example of the FFT module:

Operation mode analysis on a mobile phone during vibration alert

 

 

Different Loading Methods

Flexible and Efficient: One sensor system for dynamic, thermal and vacuum loading.

 

Dynamic Loading

For the dynamic loading the piezoshaker excitation systems are designed by isi-sys. It consists of a Piezoshaker, amplifier and function generator. For a detailled description please refer to the report Products / Piezoshaker Systems „

 

Piezoshaker frontneu

 

The Piezoshaker can be attached by vacuum to the object surface.
The HVDA-0-180 amplifier is especially design for isi-sys Piezoshakers and mobile application, where high power at low weight and compact size is a big advantage for mobility and flexible handling. High frequencies up to 100kHz and more as well as large forces and acceleration have been generated in combination with the different isi-sys Piezoshaker modules.

 

 

 

Thermal LoadingThermal loading

isi-sys offers timed thermal loading modules to to heat-up the objects of measurement.

A automated precise control of heat loading and a corresponding timed shearographic measurement is required to achieve a reproducible test procedure for non destructive testing experiments and automated systems.

Any conventional halogen flood lights with 220V can be connected. isi-sys recommends some flood lights used for professional photography. Thus they can be mounted on standard light stand of e. g. Manfrotto etc. and easily directed to the area of interest independent of the sensor head. Also this lights offer some choices of reflector combinations.

The start and duration of the heat loading and the measurements can be set per computer controlled timer, which permits reproducible sequences of the test process.

 

 

 

 

 

 

Vakuum Loading

The vacuum is another loading method for non destructive testing. The modular system concept allows to combine the SE2 sensor with different vacuum loading devices, which reduces system expense and keeps the equipment smart and mobile compared to other solutions .

The vacuum methods can be categorized depending on the loading principle into vacuum chambers/vacuum cabins and vacuum hood/vacuum windows.

 

Vacuum hood and Vacuum window

Vakuum hoodThe vacuum hood is a modular extension accessories for the SE2 sensor. The sensor will be mounted inside of the hood and therfore the measurement area is covered from sun light influences.

The system has small dimensions and is for this reason very mobile and flexible, additionally the low required vacuum pump power is an advantage.

 

 

 

 

 

Vakuum window

If you use the vacuum window, the sensor is outside the vacuum volume. The system is monitoring the object through the window. The bending forces are only across the field of view.

Due to the small volume of the vacuum window hood it can be used in combination with the small isi-vacuum unit (also used for isi-piezoshakers with vacuum cup adapter). The unit includes two separate vacuum pumps, where the second can be used for the vacuum suction cup tripod.

 

 

Vacuum chamber and Vacuum cabin

Generally vacuum chambers or cabins have the advantage against vacuum hoods and windows, that the forces appear uniform from all sides on the object. This avoids superposed fringes by global deformation such as by hood, where a bending force on the object surface is superposed, as usually the pressure forces are applied only in one direction on one side of the surface, where the hood is applied.

In both systems the sensor is inside the vacuum volume, which causes pressure loading also on the sensor. The camber and the cabin are bigger than the object and therefore depending on object size the mobility is restricted.

 

isi-sys offers the newly designed testing vacuum cabin based on aluminium-foam sandwich elements, which is recommended e. g. for frequently manual spot tests or laboratory use.  Samples with a size up to 450 x 750 mm can be measured in this cabin.

Furthermore isi-sys GmbH cooperates with different manufacturer for large vacuum chambers.

 

 

 

 

 

SE-Sensors Types

No safety requirements: Laser class 1 with power from 0,1W up to 12W per module

High resolution and sensitivity: 5 MPixel sensor, 10nm light phase reconstruction

High quality and variety of lenses: Designed for professional Nikon-F-mount lenses

 

SE1 Sensor

SE1 shearography

 

The SE1 sensor modular system

for automated applications such

as tire testing.

 

 

 

 

 

 

SE2 Sensor

isi-sys_se2_2arrayneu2

 

SE2 Sensor with 1W light power by

10 adjustable laser diodes for flexible

laboratory use. The SE2 is the most

flexible and recently new upgraded

design in the SE-sensor family.

 

 

 

 

SE2 neu array

 

 

SE2 Sensor with 12 W laser diode module

for outdoor and large field of view

applications.

 

 

 

 

 

 

SE3 Sensor

SE3

 

SE3 Sensor

 

 

 

Setup. Control. Acquire.

x

VICSnap RemoteThe new Vic-Snap Remote app will change

the way you set up your image correlation tests.

 

Conveniently view live images on your mobile device or tablet while setting up the cameras. Zoom in with a pinch to adjust your focus. The crosshairs help align the cameras just perfectly. Control exposure to get your images well lit (the histogram helps, too). Acquire calibration images with a tap.  Compatible with most iOS and Android devices. Now available on the App Store and the Google Play Store.

 

 

AppStore1

AppStore2

___________________________________________________________________________________________

 

VICSnap Remote2

Features

  • Remotely view and acquire images from Vic-Snap image acquisition systems
  • Detect and control multiple Vic-Snap systems with one device
  • Pinch-to-zoom live images
  • Double-tap images for full-screen viewing
  • Adjust the cameras’ exposure time
  • Acquire calibration and test images with automatic file naming
  • Toggle cross-hairs for alignment
  • View gray scale histogram for adjusting exposure
  • Over and under-exposure indicated using red and blue

 

 

 

 

You will find further information about VIC Snap Remote on the following web page:
http://www.correlatedsolutions.com/vic-snap-remote/

Software: isi-Studio

isi-Studio is a specialized software tool for automatic and manual controlled operating and recording of (speckle) interferometry.

The work-flow kernel of isi-Studio records the user operations. Its recall and re-do options of any operation sequences offers facilities to control individual research set ups as well as automatic solutions for industry problems. Remote controlled features such as shearing are features in conjunction with the sensor series.

Typical applications of isi-studio are non destructive testing (NDT), vibration analysis, strain and deformation measurements.

Solution Features

Automatic project and work-flow management: each operation step of your measurement or image operation is recorded.

isi-studio1X

Exposure of speckle interferograms in different acquisition techniques, such as real time phase reconstruction and time average technique with renewed reference frame.

 

X

isi-studio2X

isi-Studio offers various standard filter-types and special filters adapted to discontinuities of phase maps.

X

X

X

isi-studio3

isi-Studio contains a robust demodulation or unwrapping algorithm that removes the phase steps and converts the filtered phase map into a continuous plot.

If your phase map is filtered and demodulated, there is the choice to use automatic evaluation of the parameters, such as the wave length of the light source used, saved in the image property sheets during the measurements.

x

isi-studio4For presentation or analysis of your results, isi-Studio offers tools such as 2D or 3D plots. If you want to include your results into other documents, you have the choice of common input and output image formats (bmp, tiff, jpg, etc.) as well as the compatibility for numerical exchanges to Math-Lab, Excel and other software. Alternative the report generator can be used to create a report document.

x

x

X

An practical example to eplain the the functionality of isi-Studio:x

x

Phasenrekonstruktion Gefilterte-Phasenaenderung Demodulierte-Phasenverteilung

Recontruction:relative phase change     Filtered phase change                        Demodulated phase distribution

Falschfarbendarstellung-bzw-Quantitaqtiv Integration-Verformungsamplitude Falschfarbendarstellung-Quantitativ

False-colour image                                Integration: deformation amplitude      Quantitative false-colour image