Strain/Stress and Vibration

Digital Image Correlation System (Q-400)

The Digital Image Correlation System Q-400

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Displacement and Strain Measurement

  • Advanced materials (CFRP, wood, fiber injected PE, metal foam, rubber, …)
  • Component testing (Displacements, Strains,…)
  • Material testing (Youngs Modulus, Poisson Ratio, Elasto-Plastic Behaviour)
  • Fracture mechanics
  • FEA Validation
  • 3D display of measured values
  • Fast and easy automated calibration procedure
  • Online feedback of accuracy and quality
  • Enhanced triggering functions
  • Different coordinate systems
  • Extended export and import

The Digital 3D Correlation System Q-400 is an optical measuring instrument for true full field, non-contact and three-dimensional analysis of displacements and strains on components and specimens. It can be used on any material without restrictions.

Quantitative true full field Investigation
The Q-400 system is used for determination of three-dimensional material parameters in tensile, torsion, bending or combined tests and for strain analysis in component tests for fatigue investigations. Additionally high speed deformation measurement, fracture mechanics and many other applications are covered with Q-400.

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The Q-400 software Istra 4D offers convenient data handling

Deformation analysis on the corner of a carbon fibre reinforced structure

A Wide Range of Applications
Its flexible design opens a wide range of applications from microscopic investigations on microelectronic or biomedical materials up to large scale measurements of aerospace, automotive, marine and railway components.

  • Advanced materials (CFRP, wood, fiber injected PE, metal foam, rubber, …)
  • Component testing (Displacements, Strains,…)
  • Material testing (Youngs Modulus, Poisson Ratio, Elasto-Plastic Behaviour)
  • Fracture mechanics
  • FEA Validation
  • High Speed applications (Dynamic measurements, transient events)

User friendly System
The robust software is designed to be used in a very intuitive way. The standard HILIS Illumination is part of the system and provides cold and extremely homogenous light and thus supplies excellent conditions for measurement. An easy calibration procedure reduces measurement time.

Measuring Principle

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The measuring principle of the Q-400 system is based on digital image correlation.

A stochastic pattern is applied onto the surface of the test object. The surface is observed with two sensors. First the contour is measured, then in each captured image homologous points of the stochastic structure are identified using a specific pattern matching algorithm.

All sensor parameters are determined by a fast and easy calibration procedure - a very practical and simple way by positioning a calibration plate in front of the cameras. The achieved calibration accuracy is displayed online meanwhile the calibration.
The 3D position of each object point is determined by triangulation performed by the software Istra 4D. If image sequences are recorded during the displacement of the object, the deformation of each object point is calculated automatically.
The measuring resolution is depending on the field of view and is typically 10-5 of the measuring field, resp. 0.1% strain.
The system can be used for objects of any size by simply changing the optical lenses.

Various extension and application accessories allow the easy use of the Digital 3D-Correlation System Q-400 in different experiments.

Technical Data

Measuring area: Typical measurement areas are 20 x 15 mm² up to 1000 x 750 mm², larger / smaller measurement areas on request e.g. some mm² up to m², depending optical setup
Measuring results: Full field surface contour, 3D displacements and strains
Measuring range: up to 100% strain
Calibration plates: Sizes: 105 x 148 mm² up to 420 x 594 mm², other formats optional on request
Control electronic: Portable Notebook Control Unit, Windows 7, Windows Vista or XP Professional
Integrated analogue data acquisition and recording input and output:
8 independent free-selectable analogue Data Acquisition Channels, 16 Bit resolution, ± 0.05 V to ± 10 V synchronized to camera triggering, 2 Channels analogue output
Illumination: patented cold light system HILIS for very homogenous illumination of the specimen
Sensor chip: Different Sensor types up to 16 Mpx are possible; Typical: CCD, 1/8”, 1624 x 1234 pixel
Sensor details: Shutter speed: 47 µs – 67 s, Frame rate: up to 30 Hz, typical 5 Hz
Measuring sensitivity: Up to 1/100.000 of the Field of View depending on measuring conditions, e.g. up to 1 μm displacement sensitivity at a given Field of View  of 100 mm
Applications: Displacements and strain analysis for static and dynamic load tests on almost any material and surface

Options:

  • Multi camera system for usage of multiple sensors
  • Individual application to any testing maching with patented design
    (US patent no. 8/644.752)
  • Custom made configuration for automatic measurement and data analysis
  • Synchronous recording of analogue data
  • Option: high speed cameras 500 - 10,000 frames/sec