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 System

The 3D-Micro-DIC ste­reo sen­sor sys­tem is deve­lo­ped for full field strain and defor­ma­ti­on mea­su­re­ment on small FOV with hig­hest pre­cisi­on and reso­lu­ti­on over the com­ple­te field of view by 3D digi­tal image cor­re­la­ti­on (DIC). It also ope­ra­tes as exten­so­me­ter for real-time stain con­trol. The Examp­le below shows the new sen­sor ver­si­on 2019 for 1:1 magni­fi­ca­ti­on. FOV ran­ge starts from 2:1 with 4.2 x 3.5 mm @ 5Mpx and 75Hz.

Advantages and features of  the 3D-Micro-DIC 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 the 3D-Micro-DIC system

  • 3D full field (5Mpx@75Hz frame rate) con­ti­nuous­ly record­ing on SSD
  • Hig­her frame­ra­tes at redu­ced resolution
    (e. g. [Pixel@Hz]: 1600x1200@133; 1920x1080@148; 1280x720@217; 800x600@258; 640x480@315; 320x240@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 small FOV versions [mm]

1:2 Magni­fi­ca­ti­on (~ 16mm x 12mm @ 2.8 mm FOD)

1:1 Magni­fi­ca­ti­on (~ 8mm x 6mm @ 1.2 mm FOD)

2:1 Magni­fi­ca­ti­on (~ 4.2mm x 3.5mm @ 0.25 mm FOD)

Data acquisition units (DAQ) for 3D-Micro-DIC

strainograph-daq2

  • Image 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

 

 

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/

Vic-3D High-Speed Vibration Analysis System

Vibration1               Vibration2

 

The Vic-3D™ Vibra­ti­on Ana­ly­sis Sys­tem by Cor­re­la­ted Solu­ti­ons, Inc. is a new addi­ti­on to the Vic-3D pro­duct line of mea­su­re­ment solu­ti­ons. Vic-3D Vibra­ti­on enab­les full-field 3D viewing, mea­su­re­ment, and ana­ly­sis of tran­si­ent events. Full-field ope­ra­tio­nal deflec­tion shapes in the fre­quen­cy domain can easi­ly be seen and com­pa­red with levels of accu­ra­cy in the nano­me­ter range.

The image abo­ve on the left is a moun­ted model jet pla­ne which has under­go­ne a tran­si­ent vibra­ti­on event.  To the right, the 3D vibra­ti­on data obtai­ned from the event is shown as a 2D con­tour over­lay on this image.  The data over­lay enab­les the user to see exact­ly how much defor­ma­ti­on is occur­ring and whe­re it is occur­ring.  This infor­ma­ti­on is avail­ab­le at each fre­quen­cy whe­re deflec­tion shapes occur.

The data below dis­plays one ope­ra­tio­nal deflec­tion shape obtai­ned with the VIC-3D Vibra­ti­on Ana­ly­sis Sys­tem. Three-dimen­sio­nal dis­pla­ce­ments, strains, velo­ci­ties, and acce­le­ra­ti­ons can all be com­pu­ted in the ana­ly­sis soft­ware.  The result is not only visu­al, but also enab­les the user to export quan­ti­ta­ti­ve data (ASCII, Mat­Lab, CSV, etc.) from the sample’s beha­vi­or for FEA ana­ly­sis and vali­da­ti­on.  A 3D ani­ma­ti­on of the model jet’s ope­ra­tio­nal deflec­tion shape at 441 Hz is shown below, with only 12 microns of dis­pla­ce­ment amplitude.

 

Film Vibration3D_W_431Hz

 

What is transient vibration analysis? 

Tran­si­ent vibra­ti­on ana­ly­sis is the pro­cess of moni­to­ring, mea­su­ring, and ana­ly­zing the con­di­ti­on of sam­ples during a tran­si­ent event. Mate­ri­al pro­per­ties can also be obser­ved through the ana­ly­sis of ope­ra­tio­nal deflec­tion shapes and mode shapes crea­ted by the event. The­se full-field 3D shapes can pro­vi­de use­ful infor­ma­ti­on which can be used to impro­ve and cor­rect a sample’s balan­ce, dis­pla­ce­ment, fle­xu­re, rigi­di­ty, and over­all pro­duct per­for­mance.  Mea­su­ring ope­ra­tio­nal deflec­tion shapes can help ans­wer the ques­ti­on: “How much is this struc­tu­re actual­ly moving at a par­ti­cu­lar frequency?”

 

Why is it important to you?

Ope­ra­tio­nal deflec­tion shapes crea­ted from tran­si­ent tests show how a sam­ple can have a non­uni­form thic­knes­ses, sur­face irre­gu­la­ri­ties, weak points, cracks and/or other imper­fec­tions & flaws.  This infor­ma­ti­on can be use­ful at any point in the pro­cess of achie­ving your over­all goal, from wri­ting a pro­ject pro­po­sal to tes­ting a func­tio­n­al or fai­ling part in the field: The Vic-3D Vibra­ti­on Ana­ly­sis Sys­tem

  • Has a jus­ti­fia­ble pri­ce point when wri­ting proposals
  • Can be used: 
    • To crea­te and vali­da­te FE models when designing parts & equipment
    • During the rese­arch and design process
    • In the pro­duct tes­ting phase
    • To pro­vi­de manu­fac­tu­ring qua­li­ty assurance
    • To cer­ti­fy and assu­re equip­ment is ope­ra­ting as expec­ted and required
    • To mea­su­re and ana­ly­ze parts post-installation
    • To ensu­re pro­duct qua­li­ty and per­for­mance over time and in the field
    • When reas­ses­sing pro­duct func­tio­n­a­li­ty over time

 

Examp­les of tran­si­ent events which can be mea­su­red are the following:

▪ Door Slams ▪ Modal Ham­mer Strikes
▪ Engi­ne Start-ups ▪ Drop Tests
▪ Explo­si­ve Testing ▪ Bal­listic Testing

 

System Features 

  • View, com­pa­re, ani­ma­te, graph, extract, and export data for easy FEA comparison
  • Mea­su­re 3D full-field, high fre­quen­cy mode shapes with nano­me­ter resolution
  • Mea­su­re extre­me­ly low ampli­tu­des with extre­me­ly high accelerations
  • Full-field strain, defor­ma­ti­on, and shape varia­bles are still available
  • Easy pro­ce­du­res, accu­ra­te results
  • User friend­ly interface
  • Only a frac­tion of the pri­ce of a laser vibro­me­ter system

 

Advantages over other measurement techniques

While tra­di­tio­nal vibra­ti­on mea­su­re­ment tech­ni­ques can be use­ful, they also have many draw­backs.  For examp­le, acce­le­ro­me­ters can beco­me unglued during tes­ting, can mass-load a sam­ple, and can only pro­vi­de point to point mea­su­re­ments, often only in a sin­gle pla­ne. Pre-tes­ting and tes­ting can also take days or even weeks to per­form on lar­ge struc­tures.  With the Vic-3D Vibra­ti­on Ana­ly­sis sys­tem, the­re are no adhe­si­ves, wires, signal ana­ly­zers, power ampli­fiers, or load cells necessa­ry for detail­ed vibra­ti­on results.  Obtai­ning thousands of data points for a tiny, com­plex struc­tu­re or a lar­ge one is as easy as chan­ging a pair of len­ses. Simi­lar to digi­tal image cor­re­la­ti­on, laser vibro­me­ters can pro­vi­de a non-con­ta­ct mea­su­re­ment solu­ti­on, but simi­lar to acce­le­ro­me­ters, they are also only able pro­vi­de point to point mea­su­re­ments.  A 3D mea­su­re­ment can be achie­ved with mul­ti­ple scan­ning vibro­me­ters, but the­se are usual­ly moun­ted on lar­ge robot arms which can take up valu­able labo­ra­to­ry space and can­not be moved easi­ly once instal­led.  Addi­tio­nal­ly, the­se sys­tems are unre­a­son­ab­ly expen­si­ve for many app­li­ca­ti­ons.  The Vic-3D Vibra­ti­on Ana­ly­sis sys­tem can be taken into the field with any com­pa­ti­ble lap­top and tog­e­ther with the Vic-3D Work­sta­tion, the sys­tem can beco­me mobi­le and secu­re insi­de your faci­li­ty.  Vic-3D Vibra­ti­on Ana­ly­sis is only a frac­tion of the pri­ce of a 3D scan­ning laser vibro­me­ter sys­tem, and sin­ce the modu­le can be added onto any exis­ting 3D sys­tem, it’s even more affordable.

Vic-Volume — Software

VIC Volume1The new Vic-Volu­me soft­ware by Cor­re­la­ted Solu­ti­ons is an exci­ting addi­ti­on to the Vic image cor­re­la­ti­on pro­duct line. Vic-Volu­me uti­li­zes volu­metric images from X‑Rays or CT-Scan­ners to mea­su­re inter­nal defor­ma­ti­on of a spe­ci­men under an app­lied load. Vic-Volu­me ana­ly­zes the acqui­red images to crea­te three-dimen­sio­nal volu­metric dis­pla­ce­ment and strain data of the specimen’s inter­nal beha­vi­or. The resul­ting data is a full-field con­tour plot of the defor­ma­ti­on data that can be view­ed, ani­ma­ted, and extrac­ted for FEA vali­da­ti­on. The image to the left dis­plays the inter­nal strain (Ezz) of a rub­ber puck under­go­ing compression.
 X

 

 X

Technology Background

VIC Volume2

Digi­tal Image Cor­re­la­ti­on (DIC) has found widespread popu­la­ri­ty among sci­en­tists, rese­ar­chers and engi­neers across the glo­be due to its accu­ra­cy, robust­ness, ver­sa­ti­li­ty, fle­xi­bi­li­ty and over­all ease of use. DIC is com­mon­ly used to mea­su­re 2D and 3D sur­face defor­ma­ti­on and strain uti­li­zing white light machi­ne visi­on digi­tal came­ras. Cor­re­la­ted Solu­ti­ons has offe­red turn-key  2D and 3D DIC sys­tems sin­ce 1998, and con­ti­nues to deve­lop and add new advan­ced DIC pro­ducts to our gro­wing pro­duct line. More recent­ly, Cor­re­la­ted Solu­ti­ons has deve­lo­ped new soft­ware that uti­li­ties images from X‑Rays or CT scan­ners to mea­su­re volu­metric defor­ma­ti­on of an object under an app­lied load.

The dia­gram abo­ve dis­plays a typi­cal set­up of how the images are acqui­red during a test. The scan­ner acqui­res images at spe­ci­fic depth coor­di­na­tes, and then Vic-Volu­me ana­ly­zes the image sli­ces to con­struct a 3D volu­me made up of vox­els. The indi­vi­du­al vox­els are the buil­ding blocks for the sub-volu­me, which con­tain the volu­metric image cor­re­la­ti­on data.

 

Example

VIC Volume4

A rein­for­ced rub­ber matrix com­po­si­te is moun­ted bet­ween two grips, and a set of refe­rence images are acqui­red from a CT scan­ner at know incre­ments.  Each ‘sli­ce’ of data is then ana­ly­zed to com­pu­te a sta­tic volu­me mea­su­re­ment.  After the spe­ci­men under­goes a ten­si­le load, images are acqui­red again by the CT scan­ner at the same loca­ti­ons.  Digi­tal Image Cor­re­la­ti­on algo­rith­ms are used to cal­cu­la­te the volu­metric chan­ge or defor­ma­ti­on at each indi­vi­du­al vox­el, which make up the 3D volume.

The abo­ve ani­ma­ti­on dis­plays the inter­nal strain (Ezz) of a rein­for­ced rub­ber matrix com­po­si­te under­go­ing ten­si­on. The volu­metric strain data can be view­ed, ana­ly­zed, or extrac­ted as a volu­me or as indi­vi­du­al data sli­ces. The inter­nal ten­si­on strain can clear­ly be seen.

Vic-Volume Software Features
  • Con­ve­ni­ent AOI selec­tion method through “Twee­ning’’
  • Semi-auto­ma­tic initi­al guess computation
  • Opti­mi­zed for accu­ra­cy redu­ce non-line­ar opti­miz­a­ti­on to redu­ce bias and inter­po­la­ti­on artifacts
  • High­ly Advan­ced memo­ry manage­ment per­mits ana­ly­sis of huge volu­metric data sets
  • Volu­metric 3D dis­pla­ce­ments & strains


Vic-Gauge 2D/3D — Technology Overview

Vic-Gau­ge uses our opti­mi­zed 2‑D and 3‑D cor­re­la­ti­on algo­rith­ms to pro­vi­de real-time dis­pla­ce­ment and strain data for mecha­ni­cal tes­ting. Think of this tool as a set of vir­tu­al strain gau­ges: Data can be retrie­ved for mul­ti­ple points and plot­ted live against ana­log load inputs. Results are saved for every ana­ly­zed point, and full images may be saved for full-field ana­ly­sis in Vic-2D or Vic-3D.

VIC Gauge

Mea­su­re­ment Sys­tem Fea­ture Overview

The Vic-Gau­ge 3D sys­tem is offe­red as a turn­key strain mea­su­re­ment solu­ti­on that dou­bles as a video exten­so­me­ter and vir­tu­al strain gau­ge. The sys­tem per­forms a three-dimen­sio­nal digi­tal image cor­re­la­ti­on (DIC) ana­ly­sis on a pair of images in real-time, pro­ces­ses the data, an then out­puts a con­trol signal. The mea­su­re­ments are dis­play­ed gra­phi­cal­ly, but also as vir­tu­al gau­ges values. The sys­tem uti­li­zes the same robust and pre­cise algo­rith­ms found in the Vic-3D sys­tem, and the same ease of use.

 

Gene­ral Features:

  • Real-time mea­su­re­ment of strain and dis­pla­ce­ment at one or many dis­cre­te points
  • Mea­su­re strain data at points, or use vir­tu­al exten­so­me­ters to con­nect locations
  • Ana­log value inputs for real-time load vs. strain reporting
  • Dual BNC ana­log out­puts for non-con­ta­c­ting strain or dis­pla­ce­ment con­trol of test
    frames, forming machi­nes, etc.
  • Each gau­ge measures 
    • X, Y, & Z coordinates
    • X, Y, & Z displacement
    • Full strain and she­ar tensor
    • First and second princi­pal strains
  • Full test set­up can be saved as a pro­ject for fast, con­sis­tent repeated tests